NOISSUE continue reshuffling the codebase

launcher/ui/pages/BasePage.h

@@ -0,0 +1,58 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QString>
+#include <QIcon>
+#include <memory>
+
+#include "BasePageContainer.h"
+
+class BasePage
+{
+public:
+    virtual ~BasePage() {}
+    virtual QString id() const = 0;
+    virtual QString displayName() const = 0;
+    virtual QIcon icon() const = 0;
+    virtual bool apply() { return true; }
+    virtual bool shouldDisplay() const { return true; }
+    virtual QString helpPage() const { return QString(); }
+    void opened()
+    {
+        isOpened = true;
+        openedImpl();
+    }
+    void closed()
+    {
+        isOpened = false;
+        closedImpl();
+    }
+    virtual void openedImpl() {}
+    virtual void closedImpl() {}
+    virtual void setParentContainer(BasePageContainer * container)
+    {
+        m_container = container;
+    };
+public:
+    int stackIndex = -1;
+    int listIndex = -1;
+protected:
+    BasePageContainer * m_container = nullptr;
+    bool isOpened = false;
+};
+
+typedef std::shared_ptr<BasePage> BasePagePtr;

launcher/ui/pages/BasePageContainer.h

@@ -0,0 +1,10 @@
+#pragma once
+
+class BasePageContainer
+{
+public:
+    virtual ~BasePageContainer(){};
+    virtual bool selectPage(QString pageId) = 0;
+    virtual void refreshContainer() = 0;
+    virtual bool requestClose() = 0;
+};

launcher/ui/pages/BasePageProvider.h

@@ -0,0 +1,68 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "ui/pages/BasePage.h"
+#include <memory>
+#include <functional>
+
+class BasePageProvider
+{
+public:
+    virtual QList<BasePage *> getPages() = 0;
+    virtual QString dialogTitle() = 0;
+};
+
+class GenericPageProvider : public BasePageProvider
+{
+    typedef std::function<BasePage *()> PageCreator;
+public:
+    explicit GenericPageProvider(const QString &dialogTitle)
+        : m_dialogTitle(dialogTitle)
+    {
+    }
+    virtual ~GenericPageProvider() {}
+
+    QList<BasePage *> getPages() override
+    {
+        QList<BasePage *> pages;
+        for (PageCreator creator : m_creators)
+        {
+            pages.append(creator());
+        }
+        return pages;
+    }
+    QString dialogTitle() override { return m_dialogTitle; }
+
+    void setDialogTitle(const QString &title)
+    {
+        m_dialogTitle = title;
+    }
+    void addPageCreator(PageCreator page)
+    {
+        m_creators.append(page);
+    }
+
+    template<typename PageClass>
+    void addPage()
+    {
+        addPageCreator([](){return new PageClass();});
+    }
+
+private:
+    QList<PageCreator> m_creators;
+    QString m_dialogTitle;
+};

launcher/ui/pages/global/AccountListPage.cpp

@@ -0,0 +1,260 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "AccountListPage.h"
+#include "ui_AccountListPage.h"
+
+#include <QItemSelectionModel>
+#include <QMenu>
+
+#include <QDebug>
+
+#include "net/NetJob.h"
+
+#include "ui/dialogs/ProgressDialog.h"
+#include "ui/dialogs/LoginDialog.h"
+#include "ui/dialogs/MSALoginDialog.h"
+#include "ui/dialogs/CustomMessageBox.h"
+#include "ui/dialogs/SkinUploadDialog.h"
+
+#include "tasks/Task.h"
+#include "minecraft/auth/AccountTask.h"
+#include "minecraft/services/SkinDelete.h"
+
+#include "Application.h"
+
+#include "BuildConfig.h"
+
+#include "Secrets.h"
+
+AccountListPage::AccountListPage(QWidget *parent)
+    : QMainWindow(parent), ui(new Ui::AccountListPage)
+{
+    ui->setupUi(this);
+    ui->listView->setEmptyString(tr(
+        "Welcome!\n"
+        "If you're new here, you can click the \"Add\" button to add your Mojang or Minecraft account."
+    ));
+    ui->listView->setEmptyMode(VersionListView::String);
+    ui->listView->setContextMenuPolicy(Qt::CustomContextMenu);
+
+    m_accounts = APPLICATION->accounts();
+
+    ui->listView->setModel(m_accounts.get());
+    ui->listView->header()->setSectionResizeMode(0, QHeaderView::Stretch);
+    ui->listView->header()->setSectionResizeMode(1, QHeaderView::Stretch);
+    ui->listView->header()->setSectionResizeMode(2, QHeaderView::ResizeToContents);
+    ui->listView->setSelectionMode(QAbstractItemView::SingleSelection);
+
+    // Expand the account column
+
+    QItemSelectionModel *selectionModel = ui->listView->selectionModel();
+
+    connect(selectionModel, &QItemSelectionModel::selectionChanged, [this](const QItemSelection &sel, const QItemSelection &dsel) {
+        updateButtonStates();
+    });
+    connect(ui->listView, &VersionListView::customContextMenuRequested, this, &AccountListPage::ShowContextMenu);
+
+    connect(m_accounts.get(), &AccountList::listChanged, this, &AccountListPage::listChanged);
+    connect(m_accounts.get(), &AccountList::listActivityChanged, this, &AccountListPage::listChanged);
+    connect(m_accounts.get(), &AccountList::defaultAccountChanged, this, &AccountListPage::listChanged);
+
+    updateButtonStates();
+
+    // Xbox authentication won't work without a client identifier, so disable the button if it is missing
+    ui->actionAddMicrosoft->setVisible(Secrets::hasMSAClientID());
+}
+
+AccountListPage::~AccountListPage()
+{
+    delete ui;
+}
+
+void AccountListPage::ShowContextMenu(const QPoint& pos)
+{
+    auto menu = ui->toolBar->createContextMenu(this, tr("Context menu"));
+    menu->exec(ui->listView->mapToGlobal(pos));
+    delete menu;
+}
+
+void AccountListPage::changeEvent(QEvent* event)
+{
+    if (event->type() == QEvent::LanguageChange)
+    {
+        ui->retranslateUi(this);
+    }
+    QMainWindow::changeEvent(event);
+}
+
+QMenu * AccountListPage::createPopupMenu()
+{
+    QMenu* filteredMenu = QMainWindow::createPopupMenu();
+    filteredMenu->removeAction(ui->toolBar->toggleViewAction() );
+    return filteredMenu;
+}
+
+
+void AccountListPage::listChanged()
+{
+    updateButtonStates();
+}
+
+void AccountListPage::on_actionAddMojang_triggered()
+{
+    MinecraftAccountPtr account = LoginDialog::newAccount(
+        this,
+        tr("Please enter your Mojang account email and password to add your account.")
+    );
+
+    if (account)
+    {
+        m_accounts->addAccount(account);
+        if (m_accounts->count() == 1) {
+            m_accounts->setDefaultAccount(account);
+        }
+    }
+}
+
+void AccountListPage::on_actionAddMicrosoft_triggered()
+{
+    if(BuildConfig.BUILD_PLATFORM == "osx64") {
+        CustomMessageBox::selectable(
+            this,
+            tr("Microsoft Accounts not available"),
+            tr(
+                "Microsoft accounts are only usable on macOS 10.13 or newer, with fully updated MultiMC.\n\n"
+                "Please update both your operating system and MultiMC."
+            ),
+            QMessageBox::Warning
+        )->exec();
+        return;
+    }
+    MinecraftAccountPtr account = MSALoginDialog::newAccount(
+        this,
+        tr("Please enter your Mojang account email and password to add your account.")
+    );
+
+    if (account)
+    {
+        m_accounts->addAccount(account);
+        if (m_accounts->count() == 1) {
+            m_accounts->setDefaultAccount(account);
+        }
+    }
+}
+
+void AccountListPage::on_actionRemove_triggered()
+{
+    QModelIndexList selection = ui->listView->selectionModel()->selectedIndexes();
+    if (selection.size() > 0)
+    {
+        QModelIndex selected = selection.first();
+        m_accounts->removeAccount(selected);
+    }
+}
+
+void AccountListPage::on_actionRefresh_triggered() {
+    QModelIndexList selection = ui->listView->selectionModel()->selectedIndexes();
+    if (selection.size() > 0) {
+        QModelIndex selected = selection.first();
+        MinecraftAccountPtr account = selected.data(AccountList::PointerRole).value<MinecraftAccountPtr>();
+        AuthSessionPtr session = std::make_shared<AuthSession>();
+        auto task = account->refresh(session);
+        if (task) {
+            ProgressDialog progDialog(this);
+            progDialog.execWithTask(task.get());
+            // TODO: respond to results of the task
+        }
+    }
+}
+
+
+void AccountListPage::on_actionSetDefault_triggered()
+{
+    QModelIndexList selection = ui->listView->selectionModel()->selectedIndexes();
+    if (selection.size() > 0)
+    {
+        QModelIndex selected = selection.first();
+        MinecraftAccountPtr account = selected.data(AccountList::PointerRole).value<MinecraftAccountPtr>();
+        m_accounts->setDefaultAccount(account);
+    }
+}
+
+void AccountListPage::on_actionNoDefault_triggered()
+{
+    m_accounts->setDefaultAccount(nullptr);
+}
+
+void AccountListPage::updateButtonStates()
+{
+    // If there is no selection, disable buttons that require something selected.
+    QModelIndexList selection = ui->listView->selectionModel()->selectedIndexes();
+    bool hasSelection = selection.size() > 0;
+    bool accountIsReady = false;
+    if (hasSelection)
+    {
+        QModelIndex selected = selection.first();
+        MinecraftAccountPtr account = selected.data(AccountList::PointerRole).value<MinecraftAccountPtr>();
+        accountIsReady = !account->isActive();
+    }
+    ui->actionRemove->setEnabled(accountIsReady);
+    ui->actionSetDefault->setEnabled(accountIsReady);
+    ui->actionUploadSkin->setEnabled(accountIsReady);
+    ui->actionDeleteSkin->setEnabled(accountIsReady);
+    ui->actionRefresh->setEnabled(accountIsReady);
+
+    if(m_accounts->defaultAccount().get() == nullptr) {
+        ui->actionNoDefault->setEnabled(false);
+        ui->actionNoDefault->setChecked(true);
+    }
+    else {
+        ui->actionNoDefault->setEnabled(true);
+        ui->actionNoDefault->setChecked(false);
+    }
+}
+
+void AccountListPage::on_actionUploadSkin_triggered()
+{
+    QModelIndexList selection = ui->listView->selectionModel()->selectedIndexes();
+    if (selection.size() > 0)
+    {
+        QModelIndex selected = selection.first();
+        MinecraftAccountPtr account = selected.data(AccountList::PointerRole).value<MinecraftAccountPtr>();
+        SkinUploadDialog dialog(account, this);
+        dialog.exec();
+    }
+}
+
+void AccountListPage::on_actionDeleteSkin_triggered()
+{
+    QModelIndexList selection = ui->listView->selectionModel()->selectedIndexes();
+    if (selection.size() <= 0)
+        return;
+
+    QModelIndex selected = selection.first();
+    AuthSessionPtr session = std::make_shared<AuthSession>();
+    MinecraftAccountPtr account = selected.data(AccountList::PointerRole).value<MinecraftAccountPtr>();
+    auto login = account->refresh(session);
+    ProgressDialog prog(this);
+    if (prog.execWithTask((Task*)login.get()) != QDialog::Accepted) {
+        CustomMessageBox::selectable(this, tr("Skin Delete"), tr("Failed to login!"), QMessageBox::Warning)->exec();
+        return;
+    }
+    auto deleteSkinTask = std::make_shared<SkinDelete>(this, session);
+    if (prog.execWithTask((Task*)deleteSkinTask.get()) != QDialog::Accepted) {
+        CustomMessageBox::selectable(this, tr("Skin Delete"), tr("Failed to delete current skin!"), QMessageBox::Warning)->exec();
+        return;
+    }
+}

launcher/ui/pages/global/AccountListPage.h

@@ -0,0 +1,85 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QMainWindow>
+#include <memory>
+
+#include "ui/pages/BasePage.h"
+
+#include "minecraft/auth/AccountList.h"
+#include "Application.h"
+
+namespace Ui
+{
+class AccountListPage;
+}
+
+class AuthenticateTask;
+
+class AccountListPage : public QMainWindow, public BasePage
+{
+    Q_OBJECT
+public:
+    explicit AccountListPage(QWidget *parent = 0);
+    ~AccountListPage();
+
+    QString displayName() const override
+    {
+        return tr("Accounts");
+    }
+    QIcon icon() const override
+    {
+        auto icon = APPLICATION->getThemedIcon("accounts");
+        if(icon.isNull())
+        {
+            icon = APPLICATION->getThemedIcon("noaccount");
+        }
+        return icon;
+    }
+    QString id() const override
+    {
+        return "accounts";
+    }
+    QString helpPage() const override
+    {
+        return "Getting-Started#adding-an-account";
+    }
+
+public slots:
+    void on_actionAddMojang_triggered();
+    void on_actionAddMicrosoft_triggered();
+    void on_actionRemove_triggered();
+    void on_actionRefresh_triggered();
+    void on_actionSetDefault_triggered();
+    void on_actionNoDefault_triggered();
+    void on_actionUploadSkin_triggered();
+    void on_actionDeleteSkin_triggered();
+
+    void listChanged();
+
+    //! Updates the states of the dialog's buttons.
+    void updateButtonStates();
+
+protected slots:
+    void ShowContextMenu(const QPoint &pos);
+
+private:
+    void changeEvent(QEvent * event) override;
+    QMenu * createPopupMenu() override;
+    shared_qobject_ptr<AccountList> m_accounts;
+    Ui::AccountListPage *ui;
+};

launcher/ui/pages/global/AccountListPage.ui

@@ -0,0 +1,129 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>AccountListPage</class>
+ <widget class="QMainWindow" name="AccountListPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>800</width>
+    <height>600</height>
+   </rect>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QHBoxLayout" name="horizontalLayout">
+    <property name="leftMargin">
+     <number>0</number>
+    </property>
+    <property name="topMargin">
+     <number>0</number>
+    </property>
+    <property name="rightMargin">
+     <number>0</number>
+    </property>
+    <property name="bottomMargin">
+     <number>0</number>
+    </property>
+    <item>
+     <widget class="VersionListView" name="listView">
+      <property name="alternatingRowColors">
+       <bool>true</bool>
+      </property>
+      <property name="rootIsDecorated">
+       <bool>false</bool>
+      </property>
+      <property name="itemsExpandable">
+       <bool>false</bool>
+      </property>
+      <property name="allColumnsShowFocus">
+       <bool>true</bool>
+      </property>
+      <attribute name="headerStretchLastSection">
+       <bool>false</bool>
+      </attribute>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+  <widget class="WideBar" name="toolBar">
+   <attribute name="toolBarArea">
+    <enum>RightToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+   <addaction name="actionAddMicrosoft"/>
+   <addaction name="actionAddMojang"/>
+   <addaction name="actionRefresh"/>
+   <addaction name="actionRemove"/>
+   <addaction name="actionSetDefault"/>
+   <addaction name="actionNoDefault"/>
+   <addaction name="separator"/>
+   <addaction name="actionUploadSkin"/>
+   <addaction name="actionDeleteSkin"/>
+  </widget>
+  <action name="actionAddMojang">
+   <property name="text">
+    <string>Add Mojang</string>
+   </property>
+  </action>
+  <action name="actionRemove">
+   <property name="text">
+    <string>Remove</string>
+   </property>
+  </action>
+  <action name="actionSetDefault">
+   <property name="text">
+    <string>Set Default</string>
+   </property>
+  </action>
+  <action name="actionNoDefault">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>No Default</string>
+   </property>
+  </action>
+  <action name="actionUploadSkin">
+   <property name="text">
+    <string>Upload Skin</string>
+   </property>
+  </action>
+  <action name="actionDeleteSkin">
+   <property name="text">
+    <string>Delete Skin</string>
+   </property>
+   <property name="toolTip">
+    <string>Delete the currently active skin and go back to the default one</string>
+   </property>
+  </action>
+  <action name="actionAddMicrosoft">
+   <property name="text">
+    <string>Add Microsoft</string>
+   </property>
+  </action>
+  <action name="actionRefresh">
+   <property name="text">
+    <string>Refresh</string>
+   </property>
+   <property name="toolTip">
+    <string>Refresh the account tokens</string>
+   </property>
+  </action>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>VersionListView</class>
+   <extends>QTreeView</extends>
+   <header>ui/widgets/VersionListView.h</header>
+  </customwidget>
+  <customwidget>
+   <class>WideBar</class>
+   <extends>QToolBar</extends>
+   <header>ui/widgets/WideBar.h</header>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/global/CustomCommandsPage.cpp

@@ -0,0 +1,51 @@
+#include "CustomCommandsPage.h"
+#include <QVBoxLayout>
+#include <QTabWidget>
+#include <QTabBar>
+
+CustomCommandsPage::CustomCommandsPage(QWidget* parent): QWidget(parent)
+{
+
+    auto verticalLayout = new QVBoxLayout(this);
+    verticalLayout->setObjectName(QStringLiteral("verticalLayout"));
+    verticalLayout->setContentsMargins(0, 0, 0, 0);
+
+    auto tabWidget = new QTabWidget(this);
+    tabWidget->setObjectName(QStringLiteral("tabWidget"));
+    commands = new CustomCommands(this);
+    commands->setContentsMargins(6, 6, 6, 6);
+    tabWidget->addTab(commands, "Foo");
+    tabWidget->tabBar()->hide();
+    verticalLayout->addWidget(tabWidget);
+    loadSettings();
+}
+
+CustomCommandsPage::~CustomCommandsPage()
+{
+}
+
+bool CustomCommandsPage::apply()
+{
+    applySettings();
+    return true;
+}
+
+void CustomCommandsPage::applySettings()
+{
+    auto s = APPLICATION->settings();
+    s->set("PreLaunchCommand", commands->prelaunchCommand());
+    s->set("WrapperCommand", commands->wrapperCommand());
+    s->set("PostExitCommand", commands->postexitCommand());
+}
+
+void CustomCommandsPage::loadSettings()
+{
+    auto s = APPLICATION->settings();
+    commands->initialize(
+        false,
+        true,
+        s->get("PreLaunchCommand").toString(),
+        s->get("WrapperCommand").toString(),
+        s->get("PostExitCommand").toString()
+    );
+}

launcher/ui/pages/global/CustomCommandsPage.h

@@ -0,0 +1,55 @@
+/* Copyright 2018-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <memory>
+#include <QDialog>
+
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+#include "ui/widgets/CustomCommands.h"
+
+class CustomCommandsPage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit CustomCommandsPage(QWidget *parent = 0);
+    ~CustomCommandsPage();
+
+    QString displayName() const override
+    {
+        return tr("Custom Commands");
+    }
+    QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("custom-commands");
+    }
+    QString id() const override
+    {
+        return "custom-commands";
+    }
+    QString helpPage() const override
+    {
+        return "Custom-commands";
+    }
+    bool apply() override;
+
+private:
+    void applySettings();
+    void loadSettings();
+    CustomCommands * commands;
+};

launcher/ui/pages/global/ExternalToolsPage.cpp

@@ -0,0 +1,233 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "ExternalToolsPage.h"
+#include "ui_ExternalToolsPage.h"
+
+#include <QMessageBox>
+#include <QFileDialog>
+#include <QStandardPaths>
+#include <QTabBar>
+
+#include "settings/SettingsObject.h"
+#include "tools/BaseProfiler.h"
+#include <FileSystem.h>
+#include "Application.h"
+#include <tools/MCEditTool.h>
+
+ExternalToolsPage::ExternalToolsPage(QWidget *parent) :
+    QWidget(parent),
+    ui(new Ui::ExternalToolsPage)
+{
+    ui->setupUi(this);
+    ui->tabWidget->tabBar()->hide();
+
+    #if QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
+    ui->jsonEditorTextBox->setClearButtonEnabled(true);
+    #endif
+
+    ui->mceditLink->setOpenExternalLinks(true);
+    ui->jvisualvmLink->setOpenExternalLinks(true);
+    ui->jprofilerLink->setOpenExternalLinks(true);
+    loadSettings();
+}
+
+ExternalToolsPage::~ExternalToolsPage()
+{
+    delete ui;
+}
+
+void ExternalToolsPage::loadSettings()
+{
+    auto s = APPLICATION->settings();
+    ui->jprofilerPathEdit->setText(s->get("JProfilerPath").toString());
+    ui->jvisualvmPathEdit->setText(s->get("JVisualVMPath").toString());
+    ui->mceditPathEdit->setText(s->get("MCEditPath").toString());
+
+    // Editors
+    ui->jsonEditorTextBox->setText(s->get("JsonEditor").toString());
+}
+void ExternalToolsPage::applySettings()
+{
+    auto s = APPLICATION->settings();
+
+    s->set("JProfilerPath", ui->jprofilerPathEdit->text());
+    s->set("JVisualVMPath", ui->jvisualvmPathEdit->text());
+    s->set("MCEditPath", ui->mceditPathEdit->text());
+
+    // Editors
+    QString jsonEditor = ui->jsonEditorTextBox->text();
+    if (!jsonEditor.isEmpty() &&
+        (!QFileInfo(jsonEditor).exists() || !QFileInfo(jsonEditor).isExecutable()))
+    {
+        QString found = QStandardPaths::findExecutable(jsonEditor);
+        if (!found.isEmpty())
+        {
+            jsonEditor = found;
+        }
+    }
+    s->set("JsonEditor", jsonEditor);
+}
+
+void ExternalToolsPage::on_jprofilerPathBtn_clicked()
+{
+    QString raw_dir = ui->jprofilerPathEdit->text();
+    QString error;
+    do
+    {
+        raw_dir = QFileDialog::getExistingDirectory(this, tr("JProfiler Folder"), raw_dir);
+        if (raw_dir.isEmpty())
+        {
+            break;
+        }
+        QString cooked_dir = FS::NormalizePath(raw_dir);
+        if (!APPLICATION->profilers()["jprofiler"]->check(cooked_dir, &error))
+        {
+            QMessageBox::critical(this, tr("Error"), tr("Error while checking JProfiler install:\n%1").arg(error));
+            continue;
+        }
+        else
+        {
+            ui->jprofilerPathEdit->setText(cooked_dir);
+            break;
+        }
+    } while (1);
+}
+void ExternalToolsPage::on_jprofilerCheckBtn_clicked()
+{
+    QString error;
+    if (!APPLICATION->profilers()["jprofiler"]->check(ui->jprofilerPathEdit->text(), &error))
+    {
+        QMessageBox::critical(this, tr("Error"), tr("Error while checking JProfiler install:\n%1").arg(error));
+    }
+    else
+    {
+        QMessageBox::information(this, tr("OK"), tr("JProfiler setup seems to be OK"));
+    }
+}
+
+void ExternalToolsPage::on_jvisualvmPathBtn_clicked()
+{
+    QString raw_dir = ui->jvisualvmPathEdit->text();
+    QString error;
+    do
+    {
+        raw_dir = QFileDialog::getOpenFileName(this, tr("JVisualVM Executable"), raw_dir);
+        if (raw_dir.isEmpty())
+        {
+            break;
+        }
+        QString cooked_dir = FS::NormalizePath(raw_dir);
+        if (!APPLICATION->profilers()["jvisualvm"]->check(cooked_dir, &error))
+        {
+            QMessageBox::critical(this, tr("Error"), tr("Error while checking JVisualVM install:\n%1").arg(error));
+            continue;
+        }
+        else
+        {
+            ui->jvisualvmPathEdit->setText(cooked_dir);
+            break;
+        }
+    } while (1);
+}
+void ExternalToolsPage::on_jvisualvmCheckBtn_clicked()
+{
+    QString error;
+    if (!APPLICATION->profilers()["jvisualvm"]->check(ui->jvisualvmPathEdit->text(), &error))
+    {
+        QMessageBox::critical(this, tr("Error"), tr("Error while checking JVisualVM install:\n%1").arg(error));
+    }
+    else
+    {
+        QMessageBox::information(this, tr("OK"), tr("JVisualVM setup seems to be OK"));
+    }
+}
+
+void ExternalToolsPage::on_mceditPathBtn_clicked()
+{
+    QString raw_dir = ui->mceditPathEdit->text();
+    QString error;
+    do
+    {
+#ifdef Q_OS_OSX
+        raw_dir = QFileDialog::getOpenFileName(this, tr("MCEdit Application"), raw_dir);
+#else
+        raw_dir = QFileDialog::getExistingDirectory(this, tr("MCEdit Folder"), raw_dir);
+#endif
+        if (raw_dir.isEmpty())
+        {
+            break;
+        }
+        QString cooked_dir = FS::NormalizePath(raw_dir);
+        if (!APPLICATION->mcedit()->check(cooked_dir, error))
+        {
+            QMessageBox::critical(this, tr("Error"), tr("Error while checking MCEdit install:\n%1").arg(error));
+            continue;
+        }
+        else
+        {
+            ui->mceditPathEdit->setText(cooked_dir);
+            break;
+        }
+    } while (1);
+}
+void ExternalToolsPage::on_mceditCheckBtn_clicked()
+{
+    QString error;
+    if (!APPLICATION->mcedit()->check(ui->mceditPathEdit->text(), error))
+    {
+        QMessageBox::critical(this, tr("Error"), tr("Error while checking MCEdit install:\n%1").arg(error));
+    }
+    else
+    {
+        QMessageBox::information(this, tr("OK"), tr("MCEdit setup seems to be OK"));
+    }
+}
+
+void ExternalToolsPage::on_jsonEditorBrowseBtn_clicked()
+{
+    QString raw_file = QFileDialog::getOpenFileName(
+        this, tr("JSON Editor"),
+        ui->jsonEditorTextBox->text().isEmpty()
+#if defined(Q_OS_LINUX)
+                ? QString("/usr/bin")
+#else
+            ? QStandardPaths::standardLocations(QStandardPaths::ApplicationsLocation).first()
+#endif
+            : ui->jsonEditorTextBox->text());
+
+    if (raw_file.isEmpty())
+    {
+        return;
+    }
+    QString cooked_file = FS::NormalizePath(raw_file);
+
+    // it has to exist and be an executable
+    if (QFileInfo(cooked_file).exists() && QFileInfo(cooked_file).isExecutable())
+    {
+        ui->jsonEditorTextBox->setText(cooked_file);
+    }
+    else
+    {
+        QMessageBox::warning(this, tr("Invalid"),
+                             tr("The file chosen does not seem to be an executable"));
+    }
+}
+
+bool ExternalToolsPage::apply()
+{
+    applySettings();
+    return true;
+}

launcher/ui/pages/global/ExternalToolsPage.h

@@ -0,0 +1,74 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QWidget>
+
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+
+namespace Ui {
+class ExternalToolsPage;
+}
+
+class ExternalToolsPage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit ExternalToolsPage(QWidget *parent = 0);
+    ~ExternalToolsPage();
+
+    QString displayName() const override
+    {
+        return tr("External Tools");
+    }
+    QIcon icon() const override
+    {
+        auto icon = APPLICATION->getThemedIcon("externaltools");
+        if(icon.isNull())
+        {
+            icon = APPLICATION->getThemedIcon("loadermods");
+        }
+        return icon;
+    }
+    QString id() const override
+    {
+        return "external-tools";
+    }
+    QString helpPage() const override
+    {
+        return "Tools";
+    }
+    virtual bool apply() override;
+
+private:
+    void loadSettings();
+    void applySettings();
+
+private:
+    Ui::ExternalToolsPage *ui;
+
+private
+slots:
+    void on_jprofilerPathBtn_clicked();
+    void on_jprofilerCheckBtn_clicked();
+    void on_jvisualvmPathBtn_clicked();
+    void on_jvisualvmCheckBtn_clicked();
+    void on_mceditPathBtn_clicked();
+    void on_mceditCheckBtn_clicked();
+    void on_jsonEditorBrowseBtn_clicked();
+};

launcher/ui/pages/global/ExternalToolsPage.ui

@@ -0,0 +1,194 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>ExternalToolsPage</class>
+ <widget class="QWidget" name="ExternalToolsPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>673</width>
+    <height>751</height>
+   </rect>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QTabWidget" name="tabWidget">
+     <property name="currentIndex">
+      <number>0</number>
+     </property>
+     <widget class="QWidget" name="tab">
+      <attribute name="title">
+       <string notr="true">Tab 1</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_2">
+       <item>
+        <widget class="QGroupBox" name="groupBox_2">
+         <property name="title">
+          <string notr="true">JProfiler</string>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_10">
+          <item>
+           <layout class="QHBoxLayout" name="horizontalLayout_4">
+            <item>
+             <widget class="QLineEdit" name="jprofilerPathEdit"/>
+            </item>
+            <item>
+             <widget class="QPushButton" name="jprofilerPathBtn">
+              <property name="text">
+               <string notr="true">...</string>
+              </property>
+             </widget>
+            </item>
+           </layout>
+          </item>
+          <item>
+           <widget class="QPushButton" name="jprofilerCheckBtn">
+            <property name="text">
+             <string>Check</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QLabel" name="jprofilerLink">
+            <property name="text">
+             <string notr="true">&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;&lt;a href=&quot;https://www.ej-technologies.com/products/jprofiler/overview.html&quot;&gt;https://www.ej-technologies.com/products/jprofiler/overview.html&lt;/a&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="groupBox_3">
+         <property name="title">
+          <string notr="true">JVisualVM</string>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_11">
+          <item>
+           <layout class="QHBoxLayout" name="horizontalLayout_5">
+            <item>
+             <widget class="QLineEdit" name="jvisualvmPathEdit"/>
+            </item>
+            <item>
+             <widget class="QPushButton" name="jvisualvmPathBtn">
+              <property name="text">
+               <string notr="true">...</string>
+              </property>
+             </widget>
+            </item>
+           </layout>
+          </item>
+          <item>
+           <widget class="QPushButton" name="jvisualvmCheckBtn">
+            <property name="text">
+             <string>Check</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QLabel" name="jvisualvmLink">
+            <property name="text">
+             <string notr="true">&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;&lt;a href=&quot;https://visualvm.github.io/&quot;&gt;https://visualvm.github.io/&lt;/a&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="groupBox_4">
+         <property name="title">
+          <string notr="true">MCEdit</string>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_12">
+          <item>
+           <layout class="QHBoxLayout" name="horizontalLayout_6">
+            <item>
+             <widget class="QLineEdit" name="mceditPathEdit"/>
+            </item>
+            <item>
+             <widget class="QPushButton" name="mceditPathBtn">
+              <property name="text">
+               <string notr="true">...</string>
+              </property>
+             </widget>
+            </item>
+           </layout>
+          </item>
+          <item>
+           <widget class="QPushButton" name="mceditCheckBtn">
+            <property name="text">
+             <string>Check</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QLabel" name="mceditLink">
+            <property name="text">
+             <string notr="true">&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;&lt;a href=&quot;https://www.mcedit.net/&quot;&gt;https://www.mcedit.net/&lt;/a&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="editorsBox">
+         <property name="title">
+          <string>External Editors (leave empty for system default)</string>
+         </property>
+         <layout class="QGridLayout" name="foldersBoxLayout_2">
+          <item row="0" column="1">
+           <widget class="QLineEdit" name="jsonEditorTextBox"/>
+          </item>
+          <item row="0" column="0">
+           <widget class="QLabel" name="labelJsonEditor">
+            <property name="text">
+             <string>Text Editor:</string>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="2">
+           <widget class="QToolButton" name="jsonEditorBrowseBtn">
+            <property name="text">
+             <string notr="true">...</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>216</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/global/JavaPage.cpp

@@ -0,0 +1,153 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "JavaPage.h"
+#include "JavaCommon.h"
+#include "ui_JavaPage.h"
+
+#include <QFileDialog>
+#include <QMessageBox>
+#include <QDir>
+#include <QTabBar>
+
+#include "ui/dialogs/VersionSelectDialog.h"
+
+#include "java/JavaUtils.h"
+#include "java/JavaInstallList.h"
+
+#include "settings/SettingsObject.h"
+#include <FileSystem.h>
+#include "Application.h"
+#include <sys.h>
+
+JavaPage::JavaPage(QWidget *parent) : QWidget(parent), ui(new Ui::JavaPage)
+{
+    ui->setupUi(this);
+    ui->tabWidget->tabBar()->hide();
+
+    auto sysMiB = Sys::getSystemRam() / Sys::mebibyte;
+    ui->maxMemSpinBox->setMaximum(sysMiB);
+    loadSettings();
+}
+
+JavaPage::~JavaPage()
+{
+    delete ui;
+}
+
+bool JavaPage::apply()
+{
+    applySettings();
+    return true;
+}
+
+void JavaPage::applySettings()
+{
+    auto s = APPLICATION->settings();
+
+    // Memory
+    int min = ui->minMemSpinBox->value();
+    int max = ui->maxMemSpinBox->value();
+    if(min < max)
+    {
+        s->set("MinMemAlloc", min);
+        s->set("MaxMemAlloc", max);
+    }
+    else
+    {
+        s->set("MinMemAlloc", max);
+        s->set("MaxMemAlloc", min);
+    }
+    s->set("PermGen", ui->permGenSpinBox->value());
+
+    // Java Settings
+    s->set("JavaPath", ui->javaPathTextBox->text());
+    s->set("JvmArgs", ui->jvmArgsTextBox->text());
+    JavaCommon::checkJVMArgs(s->get("JvmArgs").toString(), this->parentWidget());
+}
+void JavaPage::loadSettings()
+{
+    auto s = APPLICATION->settings();
+    // Memory
+    int min = s->get("MinMemAlloc").toInt();
+    int max = s->get("MaxMemAlloc").toInt();
+    if(min < max)
+    {
+        ui->minMemSpinBox->setValue(min);
+        ui->maxMemSpinBox->setValue(max);
+    }
+    else
+    {
+        ui->minMemSpinBox->setValue(max);
+        ui->maxMemSpinBox->setValue(min);
+    }
+    ui->permGenSpinBox->setValue(s->get("PermGen").toInt());
+
+    // Java Settings
+    ui->javaPathTextBox->setText(s->get("JavaPath").toString());
+    ui->jvmArgsTextBox->setText(s->get("JvmArgs").toString());
+}
+
+void JavaPage::on_javaDetectBtn_clicked()
+{
+    JavaInstallPtr java;
+
+    VersionSelectDialog vselect(APPLICATION->javalist().get(), tr("Select a Java version"), this, true);
+    vselect.setResizeOn(2);
+    vselect.exec();
+
+    if (vselect.result() == QDialog::Accepted && vselect.selectedVersion())
+    {
+        java = std::dynamic_pointer_cast<JavaInstall>(vselect.selectedVersion());
+        ui->javaPathTextBox->setText(java->path);
+    }
+}
+
+void JavaPage::on_javaBrowseBtn_clicked()
+{
+    QString raw_path = QFileDialog::getOpenFileName(this, tr("Find Java executable"));
+
+    // do not allow current dir - it's dirty. Do not allow dirs that don't exist
+    if(raw_path.isEmpty())
+    {
+        return;
+    }
+
+    QString cooked_path = FS::NormalizePath(raw_path);
+    QFileInfo javaInfo(cooked_path);;
+    if(!javaInfo.exists() || !javaInfo.isExecutable())
+    {
+        return;
+    }
+    ui->javaPathTextBox->setText(cooked_path);
+}
+
+void JavaPage::on_javaTestBtn_clicked()
+{
+    if(checker)
+    {
+        return;
+    }
+    checker.reset(new JavaCommon::TestCheck(
+        this, ui->javaPathTextBox->text(), ui->jvmArgsTextBox->text(),
+        ui->minMemSpinBox->value(), ui->maxMemSpinBox->value(), ui->permGenSpinBox->value()));
+    connect(checker.get(), SIGNAL(finished()), SLOT(checkerFinished()));
+    checker->run();
+}
+
+void JavaPage::checkerFinished()
+{
+    checker.reset();
+}

launcher/ui/pages/global/JavaPage.h

@@ -0,0 +1,72 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <memory>
+#include <QDialog>
+#include "ui/pages/BasePage.h"
+#include "JavaCommon.h"
+#include <Application.h>
+#include <QObjectPtr.h>
+
+class SettingsObject;
+
+namespace Ui
+{
+class JavaPage;
+}
+
+class JavaPage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit JavaPage(QWidget *parent = 0);
+    ~JavaPage();
+
+    QString displayName() const override
+    {
+        return tr("Java");
+    }
+    QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("java");
+    }
+    QString id() const override
+    {
+        return "java-settings";
+    }
+    QString helpPage() const override
+    {
+        return "Java-settings";
+    }
+    bool apply() override;
+
+private:
+    void applySettings();
+    void loadSettings();
+
+private
+slots:
+    void on_javaDetectBtn_clicked();
+    void on_javaTestBtn_clicked();
+    void on_javaBrowseBtn_clicked();
+    void checkerFinished();
+
+private:
+    Ui::JavaPage *ui;
+    unique_qobject_ptr<JavaCommon::TestCheck> checker;
+};

launcher/ui/pages/global/JavaPage.ui

@@ -0,0 +1,260 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>JavaPage</class>
+ <widget class="QWidget" name="JavaPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>545</width>
+    <height>580</height>
+   </rect>
+  </property>
+  <property name="sizePolicy">
+   <sizepolicy hsizetype="MinimumExpanding" vsizetype="MinimumExpanding">
+    <horstretch>0</horstretch>
+    <verstretch>0</verstretch>
+   </sizepolicy>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QTabWidget" name="tabWidget">
+     <property name="currentIndex">
+      <number>0</number>
+     </property>
+     <widget class="QWidget" name="tab">
+      <attribute name="title">
+       <string notr="true">Tab 1</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_2">
+       <item>
+        <widget class="QGroupBox" name="memoryGroupBox">
+         <property name="title">
+          <string>Memory</string>
+         </property>
+         <layout class="QGridLayout" name="gridLayout_2">
+          <item row="1" column="1">
+           <widget class="QSpinBox" name="maxMemSpinBox">
+            <property name="toolTip">
+             <string>The maximum amount of memory Minecraft is allowed to use.</string>
+            </property>
+            <property name="suffix">
+             <string notr="true"> MiB</string>
+            </property>
+            <property name="minimum">
+             <number>128</number>
+            </property>
+            <property name="maximum">
+             <number>65536</number>
+            </property>
+            <property name="singleStep">
+             <number>128</number>
+            </property>
+            <property name="value">
+             <number>1024</number>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="0">
+           <widget class="QLabel" name="labelMinMem">
+            <property name="text">
+             <string>Minimum memory allocation:</string>
+            </property>
+           </widget>
+          </item>
+          <item row="1" column="0">
+           <widget class="QLabel" name="labelMaxMem">
+            <property name="text">
+             <string>Maximum memory allocation:</string>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="1">
+           <widget class="QSpinBox" name="minMemSpinBox">
+            <property name="toolTip">
+             <string>The amount of memory Minecraft is started with.</string>
+            </property>
+            <property name="suffix">
+             <string notr="true"> MiB</string>
+            </property>
+            <property name="minimum">
+             <number>128</number>
+            </property>
+            <property name="maximum">
+             <number>65536</number>
+            </property>
+            <property name="singleStep">
+             <number>128</number>
+            </property>
+            <property name="value">
+             <number>256</number>
+            </property>
+           </widget>
+          </item>
+          <item row="2" column="0">
+           <widget class="QLabel" name="labelPermGen">
+            <property name="text">
+             <string notr="true">PermGen:</string>
+            </property>
+           </widget>
+          </item>
+          <item row="2" column="1">
+           <widget class="QSpinBox" name="permGenSpinBox">
+            <property name="toolTip">
+             <string>The amount of memory available to store loaded Java classes.</string>
+            </property>
+            <property name="suffix">
+             <string notr="true"> MiB</string>
+            </property>
+            <property name="minimum">
+             <number>64</number>
+            </property>
+            <property name="maximum">
+             <number>999999999</number>
+            </property>
+            <property name="singleStep">
+             <number>8</number>
+            </property>
+            <property name="value">
+             <number>64</number>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="javaSettingsGroupBox">
+         <property name="title">
+          <string>Java Runtime</string>
+         </property>
+         <layout class="QGridLayout" name="gridLayout_3">
+          <item row="0" column="0">
+           <widget class="QLabel" name="labelJavaPath">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="text">
+             <string>Java path:</string>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="1" colspan="2">
+           <layout class="QHBoxLayout" name="horizontalLayout">
+            <item>
+             <widget class="QLineEdit" name="javaPathTextBox"/>
+            </item>
+            <item>
+             <widget class="QPushButton" name="javaBrowseBtn">
+              <property name="sizePolicy">
+               <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+                <horstretch>0</horstretch>
+                <verstretch>0</verstretch>
+               </sizepolicy>
+              </property>
+              <property name="maximumSize">
+               <size>
+                <width>28</width>
+                <height>16777215</height>
+               </size>
+              </property>
+              <property name="text">
+               <string notr="true">...</string>
+              </property>
+             </widget>
+            </item>
+           </layout>
+          </item>
+          <item row="2" column="1" colspan="2">
+           <widget class="QLineEdit" name="jvmArgsTextBox"/>
+          </item>
+          <item row="2" column="0">
+           <widget class="QLabel" name="labelJVMArgs">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="text">
+             <string>JVM arguments:</string>
+            </property>
+           </widget>
+          </item>
+          <item row="3" column="1">
+           <widget class="QPushButton" name="javaDetectBtn">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="text">
+             <string>Auto-detect...</string>
+            </property>
+           </widget>
+          </item>
+          <item row="3" column="2">
+           <widget class="QPushButton" name="javaTestBtn">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="text">
+             <string>Test</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <tabstops>
+  <tabstop>minMemSpinBox</tabstop>
+  <tabstop>maxMemSpinBox</tabstop>
+  <tabstop>permGenSpinBox</tabstop>
+  <tabstop>javaBrowseBtn</tabstop>
+  <tabstop>javaPathTextBox</tabstop>
+  <tabstop>jvmArgsTextBox</tabstop>
+  <tabstop>javaDetectBtn</tabstop>
+  <tabstop>javaTestBtn</tabstop>
+  <tabstop>tabWidget</tabstop>
+ </tabstops>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/global/LanguagePage.cpp

@@ -0,0 +1,51 @@
+#include "LanguagePage.h"
+
+#include "ui/widgets/LanguageSelectionWidget.h"
+#include <QVBoxLayout>
+
+LanguagePage::LanguagePage(QWidget* parent) :
+    QWidget(parent)
+{
+    setObjectName(QStringLiteral("languagePage"));
+    auto layout = new QVBoxLayout(this);
+    mainWidget = new LanguageSelectionWidget(this);
+    layout->setContentsMargins(0,0,0,0);
+    layout->addWidget(mainWidget);
+    retranslate();
+}
+
+LanguagePage::~LanguagePage()
+{
+}
+
+bool LanguagePage::apply()
+{
+    applySettings();
+    return true;
+}
+
+void LanguagePage::applySettings()
+{
+    auto settings = APPLICATION->settings();
+    QString key = mainWidget->getSelectedLanguageKey();
+    settings->set("Language", key);
+}
+
+void LanguagePage::loadSettings()
+{
+    // NIL
+}
+
+void LanguagePage::retranslate()
+{
+    mainWidget->retranslate();
+}
+
+void LanguagePage::changeEvent(QEvent* event)
+{
+    if (event->type() == QEvent::LanguageChange)
+    {
+        retranslate();
+    }
+    QWidget::changeEvent(event);
+}

launcher/ui/pages/global/LanguagePage.h

@@ -0,0 +1,60 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <memory>
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+#include <QWidget>
+
+class LanguageSelectionWidget;
+
+class LanguagePage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit LanguagePage(QWidget *parent = 0);
+    virtual ~LanguagePage();
+
+    QString displayName() const override
+    {
+        return tr("Language");
+    }
+    QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("language");
+    }
+    QString id() const override
+    {
+        return "language-settings";
+    }
+    QString helpPage() const override
+    {
+        return "Language-settings";
+    }
+    bool apply() override;
+
+    void changeEvent(QEvent * ) override;
+
+private:
+    void applySettings();
+    void loadSettings();
+    void retranslate();
+
+private:
+    LanguageSelectionWidget *mainWidget;
+};

launcher/ui/pages/global/LauncherPage.cpp

@@ -0,0 +1,466 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "LauncherPage.h"
+#include "ui_LauncherPage.h"
+
+#include <QFileDialog>
+#include <QMessageBox>
+#include <QDir>
+#include <QTextCharFormat>
+
+#include "updater/UpdateChecker.h"
+
+#include "settings/SettingsObject.h"
+#include <FileSystem.h>
+#include "Application.h"
+#include "BuildConfig.h"
+#include "ui/themes/ITheme.h"
+
+#include <QApplication>
+#include <QProcess>
+
+// FIXME: possibly move elsewhere
+enum InstSortMode
+{
+    // Sort alphabetically by name.
+    Sort_Name,
+    // Sort by which instance was launched most recently.
+    Sort_LastLaunch
+};
+
+LauncherPage::LauncherPage(QWidget *parent) : QWidget(parent), ui(new Ui::LauncherPage)
+{
+    ui->setupUi(this);
+    auto origForeground = ui->fontPreview->palette().color(ui->fontPreview->foregroundRole());
+    auto origBackground = ui->fontPreview->palette().color(ui->fontPreview->backgroundRole());
+    m_colors.reset(new LogColorCache(origForeground, origBackground));
+
+    ui->sortingModeGroup->setId(ui->sortByNameBtn, Sort_Name);
+    ui->sortingModeGroup->setId(ui->sortLastLaunchedBtn, Sort_LastLaunch);
+
+    defaultFormat = new QTextCharFormat(ui->fontPreview->currentCharFormat());
+
+    m_languageModel = APPLICATION->translations();
+    loadSettings();
+
+    if(BuildConfig.UPDATER_ENABLED)
+    {
+        QObject::connect(APPLICATION->updateChecker().get(), &UpdateChecker::channelListLoaded, this, &LauncherPage::refreshUpdateChannelList);
+
+        if (APPLICATION->updateChecker()->hasChannels())
+        {
+            refreshUpdateChannelList();
+        }
+        else
+        {
+            APPLICATION->updateChecker()->updateChanList(false);
+        }
+    }
+    else
+    {
+        ui->updateSettingsBox->setHidden(true);
+    }
+    // Analytics
+    if(BuildConfig.ANALYTICS_ID.isEmpty())
+    {
+        ui->tabWidget->removeTab(ui->tabWidget->indexOf(ui->analyticsTab));
+    }
+    connect(ui->fontSizeBox, SIGNAL(valueChanged(int)), SLOT(refreshFontPreview()));
+    connect(ui->consoleFont, SIGNAL(currentFontChanged(QFont)), SLOT(refreshFontPreview()));
+
+    //move mac data button
+    QFile file(QDir::current().absolutePath() + "/dontmovemacdata");
+    if (!file.exists())
+    {
+        ui->migrateDataFolderMacBtn->setVisible(false);
+    }
+}
+
+LauncherPage::~LauncherPage()
+{
+    delete ui;
+    delete defaultFormat;
+}
+
+bool LauncherPage::apply()
+{
+    applySettings();
+    return true;
+}
+
+void LauncherPage::on_instDirBrowseBtn_clicked()
+{
+    QString raw_dir = QFileDialog::getExistingDirectory(this, tr("Instance Folder"), ui->instDirTextBox->text());
+
+    // do not allow current dir - it's dirty. Do not allow dirs that don't exist
+    if (!raw_dir.isEmpty() && QDir(raw_dir).exists())
+    {
+        QString cooked_dir = FS::NormalizePath(raw_dir);
+        if (FS::checkProblemticPathJava(QDir(cooked_dir)))
+        {
+            QMessageBox warning;
+            warning.setText(tr("You're trying to specify an instance folder which\'s path "
+                               "contains at least one \'!\'. "
+                               "Java is known to cause problems if that is the case, your "
+                               "instances (probably) won't start!"));
+            warning.setInformativeText(
+                tr("Do you really want to use this path? "
+                   "Selecting \"No\" will close this and not alter your instance path."));
+            warning.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
+            int result = warning.exec();
+            if (result == QMessageBox::Yes)
+            {
+                ui->instDirTextBox->setText(cooked_dir);
+            }
+        }
+        else
+        {
+            ui->instDirTextBox->setText(cooked_dir);
+        }
+    }
+}
+
+void LauncherPage::on_iconsDirBrowseBtn_clicked()
+{
+    QString raw_dir = QFileDialog::getExistingDirectory(this, tr("Icons Folder"), ui->iconsDirTextBox->text());
+
+    // do not allow current dir - it's dirty. Do not allow dirs that don't exist
+    if (!raw_dir.isEmpty() && QDir(raw_dir).exists())
+    {
+        QString cooked_dir = FS::NormalizePath(raw_dir);
+        ui->iconsDirTextBox->setText(cooked_dir);
+    }
+}
+void LauncherPage::on_modsDirBrowseBtn_clicked()
+{
+    QString raw_dir = QFileDialog::getExistingDirectory(this, tr("Mods Folder"), ui->modsDirTextBox->text());
+
+    // do not allow current dir - it's dirty. Do not allow dirs that don't exist
+    if (!raw_dir.isEmpty() && QDir(raw_dir).exists())
+    {
+        QString cooked_dir = FS::NormalizePath(raw_dir);
+        ui->modsDirTextBox->setText(cooked_dir);
+    }
+}
+void LauncherPage::on_migrateDataFolderMacBtn_clicked()
+{
+    QFile file(QDir::current().absolutePath() + "/dontmovemacdata");
+    file.remove();
+    QProcess::startDetached(qApp->arguments()[0]);
+    qApp->quit();
+}
+
+void LauncherPage::refreshUpdateChannelList()
+{
+    // Stop listening for selection changes. It's going to change a lot while we update it and
+    // we don't need to update the
+    // description label constantly.
+    QObject::disconnect(ui->updateChannelComboBox, SIGNAL(currentIndexChanged(int)), this,
+                        SLOT(updateChannelSelectionChanged(int)));
+
+    QList<UpdateChecker::ChannelListEntry> channelList = APPLICATION->updateChecker()->getChannelList();
+    ui->updateChannelComboBox->clear();
+    int selection = -1;
+    for (int i = 0; i < channelList.count(); i++)
+    {
+        UpdateChecker::ChannelListEntry entry = channelList.at(i);
+
+        // When it comes to selection, we'll rely on the indexes of a channel entry being the
+        // same in the
+        // combo box as it is in the update checker's channel list.
+        // This probably isn't very safe, but the channel list doesn't change often enough (or
+        // at all) for
+        // this to be a big deal. Hope it doesn't break...
+        ui->updateChannelComboBox->addItem(entry.name);
+
+        // If the update channel we just added was the selected one, set the current index in
+        // the combo box to it.
+        if (entry.id == m_currentUpdateChannel)
+        {
+            qDebug() << "Selected index" << i << "channel id" << m_currentUpdateChannel;
+            selection = i;
+        }
+    }
+
+    ui->updateChannelComboBox->setCurrentIndex(selection);
+
+    // Start listening for selection changes again and update the description label.
+    QObject::connect(ui->updateChannelComboBox, SIGNAL(currentIndexChanged(int)), this,
+                     SLOT(updateChannelSelectionChanged(int)));
+    refreshUpdateChannelDesc();
+
+    // Now that we've updated the channel list, we can enable the combo box.
+    // It starts off disabled so that if the channel list hasn't been loaded, it will be
+    // disabled.
+    ui->updateChannelComboBox->setEnabled(true);
+}
+
+void LauncherPage::updateChannelSelectionChanged(int index)
+{
+    refreshUpdateChannelDesc();
+}
+
+void LauncherPage::refreshUpdateChannelDesc()
+{
+    // Get the channel list.
+    QList<UpdateChecker::ChannelListEntry> channelList = APPLICATION->updateChecker()->getChannelList();
+    int selectedIndex = ui->updateChannelComboBox->currentIndex();
+    if (selectedIndex < 0)
+    {
+        return;
+    }
+    if (selectedIndex < channelList.count())
+    {
+        // Find the channel list entry with the given index.
+        UpdateChecker::ChannelListEntry selected = channelList.at(selectedIndex);
+
+        // Set the description text.
+        ui->updateChannelDescLabel->setText(selected.description);
+
+        // Set the currently selected channel ID.
+        m_currentUpdateChannel = selected.id;
+    }
+}
+
+void LauncherPage::applySettings()
+{
+    auto s = APPLICATION->settings();
+
+    if (ui->resetNotificationsBtn->isChecked())
+    {
+        s->set("ShownNotifications", QString());
+    }
+
+    // Updates
+    s->set("AutoUpdate", ui->autoUpdateCheckBox->isChecked());
+    s->set("UpdateChannel", m_currentUpdateChannel);
+    auto original = s->get("IconTheme").toString();
+    //FIXME: make generic
+    switch (ui->themeComboBox->currentIndex())
+    {
+    case 1:
+        s->set("IconTheme", "pe_dark");
+        break;
+    case 2:
+        s->set("IconTheme", "pe_light");
+        break;
+    case 3:
+        s->set("IconTheme", "pe_blue");
+        break;
+    case 4:
+        s->set("IconTheme", "pe_colored");
+        break;
+    case 5:
+        s->set("IconTheme", "OSX");
+        break;
+    case 6:
+        s->set("IconTheme", "iOS");
+        break;
+    case 7:
+        s->set("IconTheme", "flat");
+        break;
+    case 8:
+        s->set("IconTheme", "custom");
+        break;
+    case 0:
+    default:
+        s->set("IconTheme", "multimc");
+        break;
+    }
+
+    if(original != s->get("IconTheme"))
+    {
+        APPLICATION->setIconTheme(s->get("IconTheme").toString());
+    }
+
+    auto originalAppTheme = s->get("ApplicationTheme").toString();
+    auto newAppTheme = ui->themeComboBoxColors->currentData().toString();
+    if(originalAppTheme != newAppTheme)
+    {
+        s->set("ApplicationTheme", newAppTheme);
+        APPLICATION->setApplicationTheme(newAppTheme, false);
+    }
+
+    // Console settings
+    s->set("ShowConsole", ui->showConsoleCheck->isChecked());
+    s->set("AutoCloseConsole", ui->autoCloseConsoleCheck->isChecked());
+    s->set("ShowConsoleOnError", ui->showConsoleErrorCheck->isChecked());
+    QString consoleFontFamily = ui->consoleFont->currentFont().family();
+    s->set("ConsoleFont", consoleFontFamily);
+    s->set("ConsoleFontSize", ui->fontSizeBox->value());
+    s->set("ConsoleMaxLines", ui->lineLimitSpinBox->value());
+    s->set("ConsoleOverflowStop", ui->checkStopLogging->checkState() != Qt::Unchecked);
+
+    // Folders
+    // TODO: Offer to move instances to new instance folder.
+    s->set("InstanceDir", ui->instDirTextBox->text());
+    s->set("CentralModsDir", ui->modsDirTextBox->text());
+    s->set("IconsDir", ui->iconsDirTextBox->text());
+
+    auto sortMode = (InstSortMode)ui->sortingModeGroup->checkedId();
+    switch (sortMode)
+    {
+    case Sort_LastLaunch:
+        s->set("InstSortMode", "LastLaunch");
+        break;
+    case Sort_Name:
+    default:
+        s->set("InstSortMode", "Name");
+        break;
+    }
+
+    // Analytics
+    if(!BuildConfig.ANALYTICS_ID.isEmpty())
+    {
+        s->set("Analytics", ui->analyticsCheck->isChecked());
+    }
+}
+void LauncherPage::loadSettings()
+{
+    auto s = APPLICATION->settings();
+    // Updates
+    ui->autoUpdateCheckBox->setChecked(s->get("AutoUpdate").toBool());
+    m_currentUpdateChannel = s->get("UpdateChannel").toString();
+    //FIXME: make generic
+    auto theme = s->get("IconTheme").toString();
+    if (theme == "pe_dark")
+    {
+        ui->themeComboBox->setCurrentIndex(1);
+    }
+    else if (theme == "pe_light")
+    {
+        ui->themeComboBox->setCurrentIndex(2);
+    }
+    else if (theme == "pe_blue")
+    {
+        ui->themeComboBox->setCurrentIndex(3);
+    }
+    else if (theme == "pe_colored")
+    {
+        ui->themeComboBox->setCurrentIndex(4);
+    }
+    else if (theme == "OSX")
+    {
+        ui->themeComboBox->setCurrentIndex(5);
+    }
+    else if (theme == "iOS")
+    {
+        ui->themeComboBox->setCurrentIndex(6);
+    }
+    else if (theme == "flat")
+    {
+        ui->themeComboBox->setCurrentIndex(7);
+    }
+    else if (theme == "custom")
+    {
+        ui->themeComboBox->setCurrentIndex(8);
+    }
+    else
+    {
+        ui->themeComboBox->setCurrentIndex(0);
+    }
+
+    {
+        auto currentTheme = s->get("ApplicationTheme").toString();
+        auto themes = APPLICATION->getValidApplicationThemes();
+        int idx = 0;
+        for(auto &theme: themes)
+        {
+            ui->themeComboBoxColors->addItem(theme->name(), theme->id());
+            if(currentTheme == theme->id())
+            {
+                ui->themeComboBoxColors->setCurrentIndex(idx);
+            }
+            idx++;
+        }
+    }
+
+    // Console settings
+    ui->showConsoleCheck->setChecked(s->get("ShowConsole").toBool());
+    ui->autoCloseConsoleCheck->setChecked(s->get("AutoCloseConsole").toBool());
+    ui->showConsoleErrorCheck->setChecked(s->get("ShowConsoleOnError").toBool());
+    QString fontFamily = APPLICATION->settings()->get("ConsoleFont").toString();
+    QFont consoleFont(fontFamily);
+    ui->consoleFont->setCurrentFont(consoleFont);
+
+    bool conversionOk = true;
+    int fontSize = APPLICATION->settings()->get("ConsoleFontSize").toInt(&conversionOk);
+    if(!conversionOk)
+    {
+        fontSize = 11;
+    }
+    ui->fontSizeBox->setValue(fontSize);
+    refreshFontPreview();
+    ui->lineLimitSpinBox->setValue(s->get("ConsoleMaxLines").toInt());
+    ui->checkStopLogging->setChecked(s->get("ConsoleOverflowStop").toBool());
+
+    // Folders
+    ui->instDirTextBox->setText(s->get("InstanceDir").toString());
+    ui->modsDirTextBox->setText(s->get("CentralModsDir").toString());
+    ui->iconsDirTextBox->setText(s->get("IconsDir").toString());
+
+    QString sortMode = s->get("InstSortMode").toString();
+
+    if (sortMode == "LastLaunch")
+    {
+        ui->sortLastLaunchedBtn->setChecked(true);
+    }
+    else
+    {
+        ui->sortByNameBtn->setChecked(true);
+    }
+
+    // Analytics
+    if(!BuildConfig.ANALYTICS_ID.isEmpty())
+    {
+        ui->analyticsCheck->setChecked(s->get("Analytics").toBool());
+    }
+}
+
+void LauncherPage::refreshFontPreview()
+{
+    int fontSize = ui->fontSizeBox->value();
+    QString fontFamily = ui->consoleFont->currentFont().family();
+    ui->fontPreview->clear();
+    defaultFormat->setFont(QFont(fontFamily, fontSize));
+    {
+        QTextCharFormat format(*defaultFormat);
+        format.setForeground(m_colors->getFront(MessageLevel::Error));
+        // append a paragraph/line
+        auto workCursor = ui->fontPreview->textCursor();
+        workCursor.movePosition(QTextCursor::End);
+        workCursor.insertText(tr("[Something/ERROR] A spooky error!"), format);
+        workCursor.insertBlock();
+    }
+    {
+        QTextCharFormat format(*defaultFormat);
+        format.setForeground(m_colors->getFront(MessageLevel::Message));
+        // append a paragraph/line
+        auto workCursor = ui->fontPreview->textCursor();
+        workCursor.movePosition(QTextCursor::End);
+        workCursor.insertText(tr("[Test/INFO] A harmless message..."), format);
+        workCursor.insertBlock();
+    }
+    {
+        QTextCharFormat format(*defaultFormat);
+        format.setForeground(m_colors->getFront(MessageLevel::Warning));
+        // append a paragraph/line
+        auto workCursor = ui->fontPreview->textCursor();
+        workCursor.movePosition(QTextCursor::End);
+        workCursor.insertText(tr("[Something/WARN] A not so spooky warning."), format);
+        workCursor.insertBlock();
+    }
+}

launcher/ui/pages/global/LauncherPage.h

@@ -0,0 +1,103 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <memory>
+#include <QDialog>
+
+#include "java/JavaChecker.h"
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+#include "ui/ColorCache.h"
+#include <translations/TranslationsModel.h>
+
+class QTextCharFormat;
+class SettingsObject;
+
+namespace Ui
+{
+class LauncherPage;
+}
+
+class LauncherPage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit LauncherPage(QWidget *parent = 0);
+    ~LauncherPage();
+
+    QString displayName() const override
+    {
+        return "Launcher";
+    }
+    QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("launcher");
+    }
+    QString id() const override
+    {
+        return "launcher-settings";
+    }
+    QString helpPage() const override
+    {
+        return "Launcher-settings";
+    }
+    bool apply() override;
+
+private:
+    void applySettings();
+    void loadSettings();
+
+private
+slots:
+    void on_instDirBrowseBtn_clicked();
+    void on_modsDirBrowseBtn_clicked();
+    void on_iconsDirBrowseBtn_clicked();
+    void on_migrateDataFolderMacBtn_clicked();
+
+    /*!
+     * Updates the list of update channels in the combo box.
+     */
+    void refreshUpdateChannelList();
+
+    /*!
+     * Updates the channel description label.
+     */
+    void refreshUpdateChannelDesc();
+
+    /*!
+     * Updates the font preview
+     */
+    void refreshFontPreview();
+
+    void updateChannelSelectionChanged(int index);
+
+private:
+    Ui::LauncherPage *ui;
+
+    /*!
+     * Stores the currently selected update channel.
+     */
+    QString m_currentUpdateChannel;
+
+    // default format for the font preview...
+    QTextCharFormat *defaultFormat;
+
+    std::unique_ptr<LogColorCache> m_colors;
+
+    std::shared_ptr<TranslationsModel> m_languageModel;
+};

launcher/ui/pages/global/LauncherPage.ui

@@ -0,0 +1,584 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>LauncherPage</class>
+ <widget class="QWidget" name="LauncherPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>514</width>
+    <height>629</height>
+   </rect>
+  </property>
+  <property name="sizePolicy">
+   <sizepolicy hsizetype="MinimumExpanding" vsizetype="MinimumExpanding">
+    <horstretch>0</horstretch>
+    <verstretch>0</verstretch>
+   </sizepolicy>
+  </property>
+  <layout class="QVBoxLayout" name="mainLayout">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QTabWidget" name="tabWidget">
+     <property name="toolTip">
+      <string notr="true"/>
+     </property>
+     <property name="tabShape">
+      <enum>QTabWidget::Rounded</enum>
+     </property>
+     <property name="currentIndex">
+      <number>0</number>
+     </property>
+     <widget class="QWidget" name="featuresTab">
+      <attribute name="title">
+       <string>Features</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_9">
+       <item>
+        <widget class="QGroupBox" name="updateSettingsBox">
+         <property name="title">
+          <string>Update Settings</string>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_7">
+          <item>
+           <widget class="QCheckBox" name="autoUpdateCheckBox">
+            <property name="text">
+             <string>Check for updates on start?</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QLabel" name="updateChannelLabel">
+            <property name="text">
+             <string>Up&amp;date Channel:</string>
+            </property>
+            <property name="buddy">
+             <cstring>updateChannelComboBox</cstring>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QComboBox" name="updateChannelComboBox">
+            <property name="enabled">
+             <bool>false</bool>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QLabel" name="updateChannelDescLabel">
+            <property name="text">
+             <string>No channel selected.</string>
+            </property>
+            <property name="wordWrap">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="foldersBox">
+         <property name="title">
+          <string>Folders</string>
+         </property>
+         <layout class="QGridLayout" name="foldersBoxLayout">
+          <item row="0" column="0">
+           <widget class="QLabel" name="labelInstDir">
+            <property name="text">
+             <string>I&amp;nstances:</string>
+            </property>
+            <property name="buddy">
+             <cstring>instDirTextBox</cstring>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="1">
+           <widget class="QLineEdit" name="instDirTextBox"/>
+          </item>
+          <item row="0" column="2">
+           <widget class="QToolButton" name="instDirBrowseBtn">
+            <property name="text">
+             <string notr="true">...</string>
+            </property>
+           </widget>
+          </item>
+          <item row="1" column="0">
+           <widget class="QLabel" name="labelModsDir">
+            <property name="text">
+             <string>&amp;Mods:</string>
+            </property>
+            <property name="buddy">
+             <cstring>modsDirTextBox</cstring>
+            </property>
+           </widget>
+          </item>
+          <item row="1" column="1">
+           <widget class="QLineEdit" name="modsDirTextBox"/>
+          </item>
+          <item row="1" column="2">
+           <widget class="QToolButton" name="modsDirBrowseBtn">
+            <property name="text">
+             <string notr="true">...</string>
+            </property>
+           </widget>
+          </item>
+          <item row="2" column="1">
+           <widget class="QLineEdit" name="iconsDirTextBox"/>
+          </item>
+          <item row="2" column="0">
+           <widget class="QLabel" name="labelIconsDir">
+            <property name="text">
+             <string>&amp;Icons:</string>
+            </property>
+            <property name="buddy">
+             <cstring>iconsDirTextBox</cstring>
+            </property>
+           </widget>
+          </item>
+          <item row="2" column="2">
+           <widget class="QToolButton" name="iconsDirBrowseBtn">
+            <property name="text">
+             <string notr="true">...</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QPushButton" name="migrateDataFolderMacBtn">
+         <property name="text">
+          <string>Move the data to new location (will restart the launcher)</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacer_2">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>0</width>
+           <height>0</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
+     <widget class="QWidget" name="generalTab">
+      <attribute name="title">
+       <string>User Interface</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_6">
+       <item>
+        <widget class="QGroupBox" name="groupBox_3">
+         <property name="title">
+          <string>Launcher notifications</string>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_5">
+          <item>
+           <widget class="QPushButton" name="resetNotificationsBtn">
+            <property name="text">
+             <string>Reset hidden notifications</string>
+            </property>
+            <property name="checkable">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="sortingModeBox">
+         <property name="enabled">
+          <bool>true</bool>
+         </property>
+         <property name="title">
+          <string>Instance view sorting mode</string>
+         </property>
+         <layout class="QHBoxLayout" name="sortingModeBoxLayout">
+          <item>
+           <widget class="QRadioButton" name="sortLastLaunchedBtn">
+            <property name="text">
+             <string>By &amp;last launched</string>
+            </property>
+            <attribute name="buttonGroup">
+             <string notr="true">sortingModeGroup</string>
+            </attribute>
+           </widget>
+          </item>
+          <item>
+           <widget class="QRadioButton" name="sortByNameBtn">
+            <property name="text">
+             <string>By &amp;name</string>
+            </property>
+            <attribute name="buttonGroup">
+             <string notr="true">sortingModeGroup</string>
+            </attribute>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="themeBox">
+         <property name="title">
+          <string>Theme</string>
+         </property>
+         <layout class="QFormLayout" name="formLayout">
+          <item row="0" column="0">
+           <widget class="QLabel" name="label_3">
+            <property name="text">
+             <string>&amp;Icons</string>
+            </property>
+            <property name="buddy">
+             <cstring>themeComboBox</cstring>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="1">
+           <widget class="QComboBox" name="themeComboBox">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="focusPolicy">
+             <enum>Qt::StrongFocus</enum>
+            </property>
+            <item>
+             <property name="text">
+              <string>Default</string>
+             </property>
+            </item>
+            <item>
+             <property name="text">
+              <string>Simple (Dark Icons)</string>
+             </property>
+            </item>
+            <item>
+             <property name="text">
+              <string>Simple (Light Icons)</string>
+             </property>
+            </item>
+            <item>
+             <property name="text">
+              <string>Simple (Blue Icons)</string>
+             </property>
+            </item>
+            <item>
+             <property name="text">
+              <string>Simple (Colored Icons)</string>
+             </property>
+            </item>
+            <item>
+             <property name="text">
+              <string notr="true">OSX</string>
+             </property>
+            </item>
+            <item>
+             <property name="text">
+              <string notr="true">iOS</string>
+             </property>
+            </item>
+            <item>
+             <property name="text">
+              <string notr="true">Flat</string>
+             </property>
+            </item>
+            <item>
+             <property name="text">
+              <string>Custom</string>
+             </property>
+            </item>
+           </widget>
+          </item>
+          <item row="1" column="1">
+           <widget class="QComboBox" name="themeComboBoxColors">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="focusPolicy">
+             <enum>Qt::StrongFocus</enum>
+            </property>
+           </widget>
+          </item>
+          <item row="1" column="0">
+           <widget class="QLabel" name="label_4">
+            <property name="text">
+             <string>Colors</string>
+            </property>
+            <property name="buddy">
+             <cstring>themeComboBoxColors</cstring>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <spacer name="generalTabSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>0</width>
+           <height>0</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
+     <widget class="QWidget" name="consoleTab">
+      <attribute name="title">
+       <string>Console</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_2">
+       <item>
+        <widget class="QGroupBox" name="consoleSettingsBox">
+         <property name="title">
+          <string>Console Settings</string>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_3">
+          <item>
+           <widget class="QCheckBox" name="showConsoleCheck">
+            <property name="text">
+             <string>Show console while the game is running?</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QCheckBox" name="autoCloseConsoleCheck">
+            <property name="text">
+             <string>Automatically close console when the game quits?</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QCheckBox" name="showConsoleErrorCheck">
+            <property name="text">
+             <string>Show console when the game crashes?</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="groupBox_4">
+         <property name="title">
+          <string>History limit</string>
+         </property>
+         <layout class="QGridLayout" name="gridLayout_3">
+          <item row="1" column="0">
+           <widget class="QCheckBox" name="checkStopLogging">
+            <property name="text">
+             <string>Stop logging when log overflows</string>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="0">
+           <widget class="QSpinBox" name="lineLimitSpinBox">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="suffix">
+             <string> lines</string>
+            </property>
+            <property name="minimum">
+             <number>10000</number>
+            </property>
+            <property name="maximum">
+             <number>1000000</number>
+            </property>
+            <property name="singleStep">
+             <number>10000</number>
+            </property>
+            <property name="value">
+             <number>100000</number>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="themeBox_2">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="Preferred" vsizetype="MinimumExpanding">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+         <property name="title">
+          <string>Console font</string>
+         </property>
+         <layout class="QGridLayout" name="gridLayout_2">
+          <item row="1" column="0" colspan="2">
+           <widget class="QTextEdit" name="fontPreview">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Expanding" vsizetype="MinimumExpanding">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="horizontalScrollBarPolicy">
+             <enum>Qt::ScrollBarAlwaysOff</enum>
+            </property>
+            <property name="undoRedoEnabled">
+             <bool>false</bool>
+            </property>
+            <property name="textInteractionFlags">
+             <set>Qt::TextSelectableByKeyboard|Qt::TextSelectableByMouse</set>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="0">
+           <widget class="QFontComboBox" name="consoleFont">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="1">
+           <widget class="QSpinBox" name="fontSizeBox">
+            <property name="minimum">
+             <number>5</number>
+            </property>
+            <property name="maximum">
+             <number>16</number>
+            </property>
+            <property name="value">
+             <number>11</number>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+     <widget class="QWidget" name="analyticsTab">
+      <attribute name="title">
+       <string>Analytics</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_8">
+       <item>
+        <widget class="QGroupBox" name="consoleSettingsBox_2">
+         <property name="title">
+          <string>Analytics Settings</string>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_4">
+          <item>
+           <widget class="QCheckBox" name="analyticsCheck">
+            <property name="text">
+             <string>Send anonymous usage statistics?</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="Line" name="line">
+            <property name="orientation">
+             <enum>Qt::Horizontal</enum>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QLabel" name="label_5">
+            <property name="text">
+             <string>&lt;html&gt;&lt;head/&gt;
+&lt;body&gt;
+&lt;p&gt;The launcher sends anonymous usage statistics on every start of the application.&lt;/p&gt;&lt;p&gt;The following data is collected:&lt;/p&gt;
+&lt;ul&gt;
+&lt;li&gt;Launcher version.&lt;/li&gt;
+&lt;li&gt;Operating system name, version and architecture.&lt;/li&gt;
+&lt;li&gt;CPU architecture (kernel architecture on linux).&lt;/li&gt;
+&lt;li&gt;Size of system memory.&lt;/li&gt;
+&lt;li&gt;Java version, architecture and memory settings.&lt;/li&gt;
+&lt;/ul&gt;
+&lt;/body&gt;&lt;/html&gt;</string>
+            </property>
+            <property name="wordWrap">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <tabstops>
+  <tabstop>tabWidget</tabstop>
+  <tabstop>autoUpdateCheckBox</tabstop>
+  <tabstop>updateChannelComboBox</tabstop>
+  <tabstop>instDirTextBox</tabstop>
+  <tabstop>instDirBrowseBtn</tabstop>
+  <tabstop>modsDirTextBox</tabstop>
+  <tabstop>modsDirBrowseBtn</tabstop>
+  <tabstop>iconsDirTextBox</tabstop>
+  <tabstop>iconsDirBrowseBtn</tabstop>
+  <tabstop>resetNotificationsBtn</tabstop>
+  <tabstop>sortLastLaunchedBtn</tabstop>
+  <tabstop>sortByNameBtn</tabstop>
+  <tabstop>themeComboBox</tabstop>
+  <tabstop>themeComboBoxColors</tabstop>
+  <tabstop>showConsoleCheck</tabstop>
+  <tabstop>autoCloseConsoleCheck</tabstop>
+  <tabstop>showConsoleErrorCheck</tabstop>
+  <tabstop>lineLimitSpinBox</tabstop>
+  <tabstop>checkStopLogging</tabstop>
+  <tabstop>consoleFont</tabstop>
+  <tabstop>fontSizeBox</tabstop>
+  <tabstop>fontPreview</tabstop>
+ </tabstops>
+ <resources/>
+ <connections/>
+ <buttongroups>
+  <buttongroup name="sortingModeGroup"/>
+ </buttongroups>
+</ui>

launcher/ui/pages/global/MinecraftPage.cpp

@@ -0,0 +1,91 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "MinecraftPage.h"
+#include "ui_MinecraftPage.h"
+
+#include <QMessageBox>
+#include <QDir>
+#include <QTabBar>
+
+#include "settings/SettingsObject.h"
+#include "Application.h"
+
+MinecraftPage::MinecraftPage(QWidget *parent) : QWidget(parent), ui(new Ui::MinecraftPage)
+{
+    ui->setupUi(this);
+    ui->tabWidget->tabBar()->hide();
+    loadSettings();
+    updateCheckboxStuff();
+}
+
+MinecraftPage::~MinecraftPage()
+{
+    delete ui;
+}
+
+bool MinecraftPage::apply()
+{
+    applySettings();
+    return true;
+}
+
+void MinecraftPage::updateCheckboxStuff()
+{
+    ui->windowWidthSpinBox->setEnabled(!ui->maximizedCheckBox->isChecked());
+    ui->windowHeightSpinBox->setEnabled(!ui->maximizedCheckBox->isChecked());
+}
+
+void MinecraftPage::on_maximizedCheckBox_clicked(bool checked)
+{
+    Q_UNUSED(checked);
+    updateCheckboxStuff();
+}
+
+void MinecraftPage::applySettings()
+{
+    auto s = APPLICATION->settings();
+
+    // Window Size
+    s->set("LaunchMaximized", ui->maximizedCheckBox->isChecked());
+    s->set("MinecraftWinWidth", ui->windowWidthSpinBox->value());
+    s->set("MinecraftWinHeight", ui->windowHeightSpinBox->value());
+
+    // Native library workarounds
+    s->set("UseNativeOpenAL", ui->useNativeOpenALCheck->isChecked());
+    s->set("UseNativeGLFW", ui->useNativeGLFWCheck->isChecked());
+
+    // Game time
+    s->set("ShowGameTime", ui->showGameTime->isChecked());
+    s->set("ShowGlobalGameTime", ui->showGlobalGameTime->isChecked());
+    s->set("RecordGameTime", ui->recordGameTime->isChecked());
+}
+
+void MinecraftPage::loadSettings()
+{
+    auto s = APPLICATION->settings();
+
+    // Window Size
+    ui->maximizedCheckBox->setChecked(s->get("LaunchMaximized").toBool());
+    ui->windowWidthSpinBox->setValue(s->get("MinecraftWinWidth").toInt());
+    ui->windowHeightSpinBox->setValue(s->get("MinecraftWinHeight").toInt());
+
+    ui->useNativeOpenALCheck->setChecked(s->get("UseNativeOpenAL").toBool());
+    ui->useNativeGLFWCheck->setChecked(s->get("UseNativeGLFW").toBool());
+
+    ui->showGameTime->setChecked(s->get("ShowGameTime").toBool());
+    ui->showGlobalGameTime->setChecked(s->get("ShowGlobalGameTime").toBool());
+    ui->recordGameTime->setChecked(s->get("RecordGameTime").toBool());
+}

launcher/ui/pages/global/MinecraftPage.h

@@ -0,0 +1,70 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <memory>
+#include <QDialog>
+
+#include "java/JavaChecker.h"
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+
+class SettingsObject;
+
+namespace Ui
+{
+class MinecraftPage;
+}
+
+class MinecraftPage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit MinecraftPage(QWidget *parent = 0);
+    ~MinecraftPage();
+
+    QString displayName() const override
+    {
+        return tr("Minecraft");
+    }
+    QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("minecraft");
+    }
+    QString id() const override
+    {
+        return "minecraft-settings";
+    }
+    QString helpPage() const override
+    {
+        return "Minecraft-settings";
+    }
+    bool apply() override;
+
+private:
+    void updateCheckboxStuff();
+    void applySettings();
+    void loadSettings();
+
+private
+slots:
+    void on_maximizedCheckBox_clicked(bool checked);
+
+private:
+    Ui::MinecraftPage *ui;
+
+};

launcher/ui/pages/global/MinecraftPage.ui

@@ -0,0 +1,196 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MinecraftPage</class>
+ <widget class="QWidget" name="MinecraftPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>936</width>
+    <height>1134</height>
+   </rect>
+  </property>
+  <property name="sizePolicy">
+   <sizepolicy hsizetype="MinimumExpanding" vsizetype="MinimumExpanding">
+    <horstretch>0</horstretch>
+    <verstretch>0</verstretch>
+   </sizepolicy>
+  </property>
+  <layout class="QVBoxLayout" name="mainLayout">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QTabWidget" name="tabWidget">
+     <property name="tabShape">
+      <enum>QTabWidget::Rounded</enum>
+     </property>
+     <property name="currentIndex">
+      <number>0</number>
+     </property>
+     <widget class="QWidget" name="minecraftTab">
+      <attribute name="title">
+       <string notr="true">Minecraft</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_3">
+       <item>
+        <widget class="QGroupBox" name="windowSizeGroupBox">
+         <property name="title">
+          <string>Window Size</string>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_4">
+          <item>
+           <widget class="QCheckBox" name="maximizedCheckBox">
+            <property name="text">
+             <string>Start Minecraft maximized?</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <layout class="QGridLayout" name="gridLayoutWindowSize">
+            <item row="1" column="0">
+             <widget class="QLabel" name="labelWindowHeight">
+              <property name="text">
+               <string>Window hei&amp;ght:</string>
+              </property>
+              <property name="buddy">
+               <cstring>windowHeightSpinBox</cstring>
+              </property>
+             </widget>
+            </item>
+            <item row="0" column="0">
+             <widget class="QLabel" name="labelWindowWidth">
+              <property name="text">
+               <string>W&amp;indow width:</string>
+              </property>
+              <property name="buddy">
+               <cstring>windowWidthSpinBox</cstring>
+              </property>
+             </widget>
+            </item>
+            <item row="0" column="1">
+             <widget class="QSpinBox" name="windowWidthSpinBox">
+              <property name="minimum">
+               <number>1</number>
+              </property>
+              <property name="maximum">
+               <number>65536</number>
+              </property>
+              <property name="singleStep">
+               <number>1</number>
+              </property>
+              <property name="value">
+               <number>854</number>
+              </property>
+             </widget>
+            </item>
+            <item row="1" column="1">
+             <widget class="QSpinBox" name="windowHeightSpinBox">
+              <property name="minimum">
+               <number>1</number>
+              </property>
+              <property name="maximum">
+               <number>65536</number>
+              </property>
+              <property name="value">
+               <number>480</number>
+              </property>
+             </widget>
+            </item>
+           </layout>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="nativeLibWorkaroundGroupBox">
+         <property name="title">
+          <string>Native library workarounds</string>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_5">
+          <item>
+           <widget class="QCheckBox" name="useNativeGLFWCheck">
+            <property name="text">
+             <string>Use system installation of GLFW</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QCheckBox" name="useNativeOpenALCheck">
+            <property name="text">
+             <string>Use system installation of OpenAL</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="gameTimeGroupBox">
+         <property name="title">
+          <string>Game time</string>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_6">
+          <item>
+           <widget class="QCheckBox" name="showGameTime">
+            <property name="text">
+             <string>Show time spent playing instances</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QCheckBox" name="showGlobalGameTime">
+            <property name="text">
+             <string>Show time spent playing across all instances</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QCheckBox" name="recordGameTime">
+            <property name="text">
+             <string>Record time spent playing instances</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacerMinecraft">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>0</width>
+           <height>0</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <tabstops>
+  <tabstop>tabWidget</tabstop>
+  <tabstop>maximizedCheckBox</tabstop>
+  <tabstop>windowWidthSpinBox</tabstop>
+  <tabstop>windowHeightSpinBox</tabstop>
+  <tabstop>useNativeGLFWCheck</tabstop>
+  <tabstop>useNativeOpenALCheck</tabstop>
+ </tabstops>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/global/PasteEEPage.cpp

@@ -0,0 +1,81 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "PasteEEPage.h"
+#include "ui_PasteEEPage.h"
+
+#include <QMessageBox>
+#include <QFileDialog>
+#include <QStandardPaths>
+#include <QTabBar>
+
+#include "settings/SettingsObject.h"
+#include "tools/BaseProfiler.h"
+#include "Application.h"
+
+PasteEEPage::PasteEEPage(QWidget *parent) :
+    QWidget(parent),
+    ui(new Ui::PasteEEPage)
+{
+    ui->setupUi(this);
+    ui->tabWidget->tabBar()->hide();\
+    connect(ui->customAPIkeyEdit, &QLineEdit::textEdited, this, &PasteEEPage::textEdited);
+    loadSettings();
+}
+
+PasteEEPage::~PasteEEPage()
+{
+    delete ui;
+}
+
+void PasteEEPage::loadSettings()
+{
+    auto s = APPLICATION->settings();
+    QString keyToUse = s->get("PasteEEAPIKey").toString();
+    if(keyToUse == "multimc")
+    {
+        ui->multimcButton->setChecked(true);
+    }
+    else
+    {
+        ui->customButton->setChecked(true);
+        ui->customAPIkeyEdit->setText(keyToUse);
+    }
+}
+
+void PasteEEPage::applySettings()
+{
+    auto s = APPLICATION->settings();
+
+    QString pasteKeyToUse;
+    if (ui->customButton->isChecked())
+        pasteKeyToUse = ui->customAPIkeyEdit->text();
+    else
+    {
+        pasteKeyToUse =  "multimc";
+    }
+    s->set("PasteEEAPIKey", pasteKeyToUse);
+}
+
+bool PasteEEPage::apply()
+{
+    applySettings();
+    return true;
+}
+
+void PasteEEPage::textEdited(const QString& text)
+{
+    ui->customButton->setChecked(true);
+}

launcher/ui/pages/global/PasteEEPage.h

@@ -0,0 +1,62 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QWidget>
+
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+
+namespace Ui {
+class PasteEEPage;
+}
+
+class PasteEEPage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit PasteEEPage(QWidget *parent = 0);
+    ~PasteEEPage();
+
+    QString displayName() const override
+    {
+        return tr("Log Upload");
+    }
+    QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("log");
+    }
+    QString id() const override
+    {
+        return "log-upload";
+    }
+    QString helpPage() const override
+    {
+        return "Log-Upload";
+    }
+    virtual bool apply() override;
+
+private:
+    void loadSettings();
+    void applySettings();
+
+private slots:
+    void textEdited(const QString &text);
+
+private:
+    Ui::PasteEEPage *ui;
+};

launcher/ui/pages/global/PasteEEPage.ui

@@ -0,0 +1,128 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>PasteEEPage</class>
+ <widget class="QWidget" name="PasteEEPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>491</width>
+    <height>474</height>
+   </rect>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QTabWidget" name="tabWidget">
+     <property name="currentIndex">
+      <number>0</number>
+     </property>
+     <widget class="QWidget" name="tab">
+      <attribute name="title">
+       <string notr="true">Tab 1</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_2">
+       <item>
+        <widget class="QGroupBox" name="groupBox_2">
+         <property name="title">
+          <string>paste.ee API key</string>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_10">
+          <item>
+           <widget class="QRadioButton" name="multimcButton">
+            <property name="text">
+             <string>MultiMC key - 12MB &amp;upload limit</string>
+            </property>
+            <attribute name="buttonGroup">
+             <string notr="true">pasteButtonGroup</string>
+            </attribute>
+           </widget>
+          </item>
+          <item>
+           <widget class="QRadioButton" name="customButton">
+            <property name="text">
+             <string>&amp;Your own key - 12MB upload limit:</string>
+            </property>
+            <attribute name="buttonGroup">
+             <string notr="true">pasteButtonGroup</string>
+            </attribute>
+           </widget>
+          </item>
+          <item>
+           <widget class="QLineEdit" name="customAPIkeyEdit">
+            <property name="echoMode">
+             <enum>QLineEdit::Password</enum>
+            </property>
+            <property name="placeholderText">
+             <string>Paste your API key here!</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="Line" name="line">
+            <property name="orientation">
+             <enum>Qt::Horizontal</enum>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QLabel" name="label">
+            <property name="text">
+             <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;&lt;a href=&quot;https://paste.ee&quot;&gt;paste.ee&lt;/a&gt; is used by MultiMC for log uploads. If you have a &lt;a href=&quot;https://paste.ee&quot;&gt;paste.ee&lt;/a&gt; account, you can add your API key here and have your uploaded logs paired with your account.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+            </property>
+            <property name="textFormat">
+             <enum>Qt::RichText</enum>
+            </property>
+            <property name="wordWrap">
+             <bool>true</bool>
+            </property>
+            <property name="openExternalLinks">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>216</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <tabstops>
+  <tabstop>tabWidget</tabstop>
+  <tabstop>multimcButton</tabstop>
+  <tabstop>customButton</tabstop>
+  <tabstop>customAPIkeyEdit</tabstop>
+ </tabstops>
+ <resources/>
+ <connections/>
+ <buttongroups>
+  <buttongroup name="pasteButtonGroup"/>
+ </buttongroups>
+</ui>

launcher/ui/pages/global/ProxyPage.cpp

@@ -0,0 +1,106 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "ProxyPage.h"
+#include "ui_ProxyPage.h"
+
+#include <QTabBar>
+
+#include "settings/SettingsObject.h"
+#include "Application.h"
+#include "Application.h"
+
+ProxyPage::ProxyPage(QWidget *parent) : QWidget(parent), ui(new Ui::ProxyPage)
+{
+    ui->setupUi(this);
+    ui->tabWidget->tabBar()->hide();
+    loadSettings();
+    updateCheckboxStuff();
+
+    connect(ui->proxyGroup, SIGNAL(buttonClicked(int)), SLOT(proxyChanged(int)));
+}
+
+ProxyPage::~ProxyPage()
+{
+    delete ui;
+}
+
+bool ProxyPage::apply()
+{
+    applySettings();
+    return true;
+}
+
+void ProxyPage::updateCheckboxStuff()
+{
+    ui->proxyAddrBox->setEnabled(!ui->proxyNoneBtn->isChecked() &&
+                                 !ui->proxyDefaultBtn->isChecked());
+    ui->proxyAuthBox->setEnabled(!ui->proxyNoneBtn->isChecked() &&
+                                 !ui->proxyDefaultBtn->isChecked());
+}
+
+void ProxyPage::proxyChanged(int)
+{
+    updateCheckboxStuff();
+}
+
+void ProxyPage::applySettings()
+{
+    auto s = APPLICATION->settings();
+
+    // Proxy
+    QString proxyType = "None";
+    if (ui->proxyDefaultBtn->isChecked())
+        proxyType = "Default";
+    else if (ui->proxyNoneBtn->isChecked())
+        proxyType = "None";
+    else if (ui->proxySOCKS5Btn->isChecked())
+        proxyType = "SOCKS5";
+    else if (ui->proxyHTTPBtn->isChecked())
+        proxyType = "HTTP";
+
+    s->set("ProxyType", proxyType);
+    s->set("ProxyAddr", ui->proxyAddrEdit->text());
+    s->set("ProxyPort", ui->proxyPortEdit->value());
+    s->set("ProxyUser", ui->proxyUserEdit->text());
+    s->set("ProxyPass", ui->proxyPassEdit->text());
+
+    APPLICATION->updateProxySettings(
+        proxyType,
+        ui->proxyAddrEdit->text(),
+        ui->proxyPortEdit->value(),
+        ui->proxyUserEdit->text(),
+        ui->proxyPassEdit->text()
+    );
+}
+void ProxyPage::loadSettings()
+{
+    auto s = APPLICATION->settings();
+    // Proxy
+    QString proxyType = s->get("ProxyType").toString();
+    if (proxyType == "Default")
+        ui->proxyDefaultBtn->setChecked(true);
+    else if (proxyType == "None")
+        ui->proxyNoneBtn->setChecked(true);
+    else if (proxyType == "SOCKS5")
+        ui->proxySOCKS5Btn->setChecked(true);
+    else if (proxyType == "HTTP")
+        ui->proxyHTTPBtn->setChecked(true);
+
+    ui->proxyAddrEdit->setText(s->get("ProxyAddr").toString());
+    ui->proxyPortEdit->setValue(s->get("ProxyPort").value<uint16_t>());
+    ui->proxyUserEdit->setText(s->get("ProxyUser").toString());
+    ui->proxyPassEdit->setText(s->get("ProxyPass").toString());
+}

launcher/ui/pages/global/ProxyPage.h

@@ -0,0 +1,66 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <memory>
+#include <QDialog>
+
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+
+namespace Ui
+{
+class ProxyPage;
+}
+
+class ProxyPage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit ProxyPage(QWidget *parent = 0);
+    ~ProxyPage();
+
+    QString displayName() const override
+    {
+        return tr("Proxy");
+    }
+    QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("proxy");
+    }
+    QString id() const override
+    {
+        return "proxy-settings";
+    }
+    QString helpPage() const override
+    {
+        return "Proxy-settings";
+    }
+    bool apply() override;
+
+private:
+    void updateCheckboxStuff();
+    void applySettings();
+    void loadSettings();
+
+private
+slots:
+    void proxyChanged(int);
+
+private:
+    Ui::ProxyPage *ui;
+};

launcher/ui/pages/global/ProxyPage.ui

@@ -0,0 +1,203 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>ProxyPage</class>
+ <widget class="QWidget" name="ProxyPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>598</width>
+    <height>617</height>
+   </rect>
+  </property>
+  <property name="sizePolicy">
+   <sizepolicy hsizetype="MinimumExpanding" vsizetype="MinimumExpanding">
+    <horstretch>0</horstretch>
+    <verstretch>0</verstretch>
+   </sizepolicy>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout_2">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QTabWidget" name="tabWidget">
+     <widget class="QWidget" name="tabWidgetPage1">
+      <attribute name="title">
+       <string notr="true"/>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout">
+       <item>
+        <widget class="QLabel" name="proxyPlainTextWarningLabel_2">
+         <property name="text">
+          <string>This only applies to the launcher. Minecraft does not accept proxy settings.</string>
+         </property>
+         <property name="alignment">
+          <set>Qt::AlignCenter</set>
+         </property>
+         <property name="wordWrap">
+          <bool>true</bool>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="proxyTypeBox">
+         <property name="title">
+          <string>Type</string>
+         </property>
+         <layout class="QHBoxLayout" name="horizontalLayout_3">
+          <item>
+           <widget class="QRadioButton" name="proxyDefaultBtn">
+            <property name="toolTip">
+             <string>Uses your system's default proxy settings.</string>
+            </property>
+            <property name="text">
+             <string>&amp;Default</string>
+            </property>
+            <attribute name="buttonGroup">
+             <string notr="true">proxyGroup</string>
+            </attribute>
+           </widget>
+          </item>
+          <item>
+           <widget class="QRadioButton" name="proxyNoneBtn">
+            <property name="text">
+             <string>&amp;None</string>
+            </property>
+            <attribute name="buttonGroup">
+             <string notr="true">proxyGroup</string>
+            </attribute>
+           </widget>
+          </item>
+          <item>
+           <widget class="QRadioButton" name="proxySOCKS5Btn">
+            <property name="text">
+             <string>SOC&amp;KS5</string>
+            </property>
+            <attribute name="buttonGroup">
+             <string notr="true">proxyGroup</string>
+            </attribute>
+           </widget>
+          </item>
+          <item>
+           <widget class="QRadioButton" name="proxyHTTPBtn">
+            <property name="text">
+             <string>H&amp;TTP</string>
+            </property>
+            <attribute name="buttonGroup">
+             <string notr="true">proxyGroup</string>
+            </attribute>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="proxyAddrBox">
+         <property name="title">
+          <string>Address and Port</string>
+         </property>
+         <layout class="QHBoxLayout" name="horizontalLayout_2">
+          <item>
+           <widget class="QLineEdit" name="proxyAddrEdit">
+            <property name="placeholderText">
+             <string notr="true">127.0.0.1</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QSpinBox" name="proxyPortEdit">
+            <property name="alignment">
+             <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+            </property>
+            <property name="buttonSymbols">
+             <enum>QAbstractSpinBox::PlusMinus</enum>
+            </property>
+            <property name="maximum">
+             <number>65535</number>
+            </property>
+            <property name="value">
+             <number>8080</number>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="proxyAuthBox">
+         <property name="title">
+          <string>Authentication</string>
+         </property>
+         <layout class="QGridLayout" name="gridLayout_5">
+          <item row="0" column="1">
+           <widget class="QLineEdit" name="proxyUserEdit"/>
+          </item>
+          <item row="0" column="0">
+           <widget class="QLabel" name="proxyUsernameLabel">
+            <property name="text">
+             <string>Username:</string>
+            </property>
+           </widget>
+          </item>
+          <item row="1" column="0">
+           <widget class="QLabel" name="proxyPasswordLabel">
+            <property name="text">
+             <string>Password:</string>
+            </property>
+           </widget>
+          </item>
+          <item row="1" column="1">
+           <widget class="QLineEdit" name="proxyPassEdit">
+            <property name="echoMode">
+             <enum>QLineEdit::Password</enum>
+            </property>
+           </widget>
+          </item>
+          <item row="2" column="0" colspan="2">
+           <widget class="QLabel" name="proxyPlainTextWarningLabel">
+            <property name="text">
+             <string>Note: Proxy username and password are stored in plain text inside the launcher's configuration file!</string>
+            </property>
+            <property name="wordWrap">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+ <buttongroups>
+  <buttongroup name="proxyGroup"/>
+ </buttongroups>
+</ui>

launcher/ui/pages/instance/GameOptionsPage.cpp

@@ -0,0 +1,37 @@
+#include "GameOptionsPage.h"
+#include "ui_GameOptionsPage.h"
+#include "minecraft/MinecraftInstance.h"
+#include "minecraft/gameoptions/GameOptions.h"
+
+GameOptionsPage::GameOptionsPage(MinecraftInstance * inst, QWidget* parent)
+    : QWidget(parent), ui(new Ui::GameOptionsPage)
+{
+    ui->setupUi(this);
+    ui->tabWidget->tabBar()->hide();
+    m_model = inst->gameOptionsModel();
+    ui->optionsView->setModel(m_model.get());
+    auto head = ui->optionsView->header();
+    if(head->count())
+    {
+        head->setSectionResizeMode(0, QHeaderView::ResizeToContents);
+        for(int i = 1; i < head->count(); i++)
+        {
+            head->setSectionResizeMode(i, QHeaderView::Stretch);
+        }
+    }
+}
+
+GameOptionsPage::~GameOptionsPage()
+{
+    // m_model->save();
+}
+
+void GameOptionsPage::openedImpl()
+{
+    // m_model->observe();
+}
+
+void GameOptionsPage::closedImpl()
+{
+    // m_model->unobserve();
+}

launcher/ui/pages/instance/GameOptionsPage.h

@@ -0,0 +1,63 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QWidget>
+#include <QString>
+
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+
+namespace Ui
+{
+class GameOptionsPage;
+}
+
+class GameOptions;
+class MinecraftInstance;
+
+class GameOptionsPage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit GameOptionsPage(MinecraftInstance *inst, QWidget *parent = 0);
+    virtual ~GameOptionsPage();
+
+    void openedImpl() override;
+    void closedImpl() override;
+
+    virtual QString displayName() const override
+    {
+        return tr("Game Options");
+    }
+    virtual QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("settings");
+    }
+    virtual QString id() const override
+    {
+        return "gameoptions";
+    }
+    virtual QString helpPage() const override
+    {
+        return "Game-Options-management";
+    }
+
+private: // data
+    Ui::GameOptionsPage *ui = nullptr;
+    std::shared_ptr<GameOptions> m_model;
+};

launcher/ui/pages/instance/GameOptionsPage.ui

@@ -0,0 +1,88 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>GameOptionsPage</class>
+ <widget class="QWidget" name="GameOptionsPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>706</width>
+    <height>575</height>
+   </rect>
+  </property>
+  <layout class="QGridLayout" name="gridLayout">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item row="0" column="0">
+    <widget class="QTabWidget" name="tabWidget">
+     <property name="currentIndex">
+      <number>0</number>
+     </property>
+     <widget class="QWidget" name="tab">
+      <property name="sizePolicy">
+       <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+        <horstretch>0</horstretch>
+        <verstretch>0</verstretch>
+       </sizepolicy>
+      </property>
+      <attribute name="title">
+       <string notr="true">Tab 1</string>
+      </attribute>
+      <layout class="QGridLayout" name="gridLayout_2">
+       <item row="0" column="0" colspan="2">
+        <widget class="QTreeView" name="optionsView">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+         <property name="acceptDrops">
+          <bool>true</bool>
+         </property>
+         <property name="alternatingRowColors">
+          <bool>true</bool>
+         </property>
+         <property name="selectionMode">
+          <enum>QAbstractItemView::SingleSelection</enum>
+         </property>
+         <property name="selectionBehavior">
+          <enum>QAbstractItemView::SelectRows</enum>
+         </property>
+         <property name="iconSize">
+          <size>
+           <width>64</width>
+           <height>64</height>
+          </size>
+         </property>
+         <property name="rootIsDecorated">
+          <bool>false</bool>
+         </property>
+         <attribute name="headerStretchLastSection">
+          <bool>false</bool>
+         </attribute>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <tabstops>
+  <tabstop>tabWidget</tabstop>
+  <tabstop>optionsView</tabstop>
+ </tabstops>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/instance/InstanceSettingsPage.cpp

@@ -0,0 +1,341 @@
+#include "InstanceSettingsPage.h"
+#include "ui_InstanceSettingsPage.h"
+
+#include <QFileDialog>
+#include <QDialog>
+#include <QMessageBox>
+
+#include <sys.h>
+
+#include "ui/dialogs/VersionSelectDialog.h"
+#include "ui/widgets/CustomCommands.h"
+
+#include "JavaCommon.h"
+#include "Application.h"
+
+#include "java/JavaInstallList.h"
+#include "FileSystem.h"
+
+
+InstanceSettingsPage::InstanceSettingsPage(BaseInstance *inst, QWidget *parent)
+    : QWidget(parent), ui(new Ui::InstanceSettingsPage), m_instance(inst)
+{
+    m_settings = inst->settings();
+    ui->setupUi(this);
+    auto sysMB = Sys::getSystemRam() / Sys::mebibyte;
+    ui->maxMemSpinBox->setMaximum(sysMB);
+    connect(ui->openGlobalJavaSettingsButton, &QCommandLinkButton::clicked, this, &InstanceSettingsPage::globalSettingsButtonClicked);
+    connect(APPLICATION, &Application::globalSettingsAboutToOpen, this, &InstanceSettingsPage::applySettings);
+    connect(APPLICATION, &Application::globalSettingsClosed, this, &InstanceSettingsPage::loadSettings);
+    loadSettings();
+}
+
+bool InstanceSettingsPage::shouldDisplay() const
+{
+    return !m_instance->isRunning();
+}
+
+InstanceSettingsPage::~InstanceSettingsPage()
+{
+    delete ui;
+}
+
+void InstanceSettingsPage::globalSettingsButtonClicked(bool)
+{
+    switch(ui->settingsTabs->currentIndex()) {
+        case 0:
+            APPLICATION->ShowGlobalSettings(this, "java-settings");
+            return;
+        case 1:
+            APPLICATION->ShowGlobalSettings(this, "minecraft-settings");
+            return;
+        case 2:
+            APPLICATION->ShowGlobalSettings(this, "custom-commands");
+            return;
+    }
+}
+
+bool InstanceSettingsPage::apply()
+{
+    applySettings();
+    return true;
+}
+
+void InstanceSettingsPage::applySettings()
+{
+    SettingsObject::Lock lock(m_settings);
+
+    // Console
+    bool console = ui->consoleSettingsBox->isChecked();
+    m_settings->set("OverrideConsole", console);
+    if (console)
+    {
+        m_settings->set("ShowConsole", ui->showConsoleCheck->isChecked());
+        m_settings->set("AutoCloseConsole", ui->autoCloseConsoleCheck->isChecked());
+        m_settings->set("ShowConsoleOnError", ui->showConsoleErrorCheck->isChecked());
+    }
+    else
+    {
+        m_settings->reset("ShowConsole");
+        m_settings->reset("AutoCloseConsole");
+        m_settings->reset("ShowConsoleOnError");
+    }
+
+    // Window Size
+    bool window = ui->windowSizeGroupBox->isChecked();
+    m_settings->set("OverrideWindow", window);
+    if (window)
+    {
+        m_settings->set("LaunchMaximized", ui->maximizedCheckBox->isChecked());
+        m_settings->set("MinecraftWinWidth", ui->windowWidthSpinBox->value());
+        m_settings->set("MinecraftWinHeight", ui->windowHeightSpinBox->value());
+    }
+    else
+    {
+        m_settings->reset("LaunchMaximized");
+        m_settings->reset("MinecraftWinWidth");
+        m_settings->reset("MinecraftWinHeight");
+    }
+
+    // Memory
+    bool memory = ui->memoryGroupBox->isChecked();
+    m_settings->set("OverrideMemory", memory);
+    if (memory)
+    {
+        int min = ui->minMemSpinBox->value();
+        int max = ui->maxMemSpinBox->value();
+        if(min < max)
+        {
+            m_settings->set("MinMemAlloc", min);
+            m_settings->set("MaxMemAlloc", max);
+        }
+        else
+        {
+            m_settings->set("MinMemAlloc", max);
+            m_settings->set("MaxMemAlloc", min);
+        }
+        m_settings->set("PermGen", ui->permGenSpinBox->value());
+    }
+    else
+    {
+        m_settings->reset("MinMemAlloc");
+        m_settings->reset("MaxMemAlloc");
+        m_settings->reset("PermGen");
+    }
+
+    // Java Install Settings
+    bool javaInstall = ui->javaSettingsGroupBox->isChecked();
+    m_settings->set("OverrideJavaLocation", javaInstall);
+    if (javaInstall)
+    {
+        m_settings->set("JavaPath", ui->javaPathTextBox->text());
+    }
+    else
+    {
+        m_settings->reset("JavaPath");
+    }
+
+    // Java arguments
+    bool javaArgs = ui->javaArgumentsGroupBox->isChecked();
+    m_settings->set("OverrideJavaArgs", javaArgs);
+    if(javaArgs)
+    {
+        m_settings->set("JvmArgs", ui->jvmArgsTextBox->toPlainText().replace("\n", " "));
+        JavaCommon::checkJVMArgs(m_settings->get("JvmArgs").toString(), this->parentWidget());
+    }
+    else
+    {
+        m_settings->reset("JvmArgs");
+    }
+
+    // old generic 'override both' is removed.
+    m_settings->reset("OverrideJava");
+
+    // Custom Commands
+    bool custcmd = ui->customCommands->checked();
+    m_settings->set("OverrideCommands", custcmd);
+    if (custcmd)
+    {
+        m_settings->set("PreLaunchCommand", ui->customCommands->prelaunchCommand());
+        m_settings->set("WrapperCommand", ui->customCommands->wrapperCommand());
+        m_settings->set("PostExitCommand", ui->customCommands->postexitCommand());
+    }
+    else
+    {
+        m_settings->reset("PreLaunchCommand");
+        m_settings->reset("WrapperCommand");
+        m_settings->reset("PostExitCommand");
+    }
+
+    // Workarounds
+    bool workarounds = ui->nativeWorkaroundsGroupBox->isChecked();
+    m_settings->set("OverrideNativeWorkarounds", workarounds);
+    if(workarounds)
+    {
+        m_settings->set("UseNativeOpenAL", ui->useNativeOpenALCheck->isChecked());
+        m_settings->set("UseNativeGLFW", ui->useNativeGLFWCheck->isChecked());
+    }
+    else
+    {
+        m_settings->reset("UseNativeOpenAL");
+        m_settings->reset("UseNativeGLFW");
+    }
+
+    // Game time
+    bool gameTime = ui->gameTimeGroupBox->isChecked();
+    m_settings->set("OverrideGameTime", gameTime);
+    if (gameTime)
+    {
+        m_settings->set("ShowGameTime", ui->showGameTime->isChecked());
+        m_settings->set("RecordGameTime", ui->recordGameTime->isChecked());
+    }
+    else
+    {
+        m_settings->reset("ShowGameTime");
+        m_settings->reset("RecordGameTime");
+    }
+
+    // Join server on launch
+    bool joinServerOnLaunch = ui->serverJoinGroupBox->isChecked();
+    m_settings->set("JoinServerOnLaunch", joinServerOnLaunch);
+    if (joinServerOnLaunch)
+    {
+        m_settings->set("JoinServerOnLaunchAddress", ui->serverJoinAddress->text());
+    }
+    else
+    {
+        m_settings->reset("JoinServerOnLaunchAddress");
+    }
+}
+
+void InstanceSettingsPage::loadSettings()
+{
+    // Console
+    ui->consoleSettingsBox->setChecked(m_settings->get("OverrideConsole").toBool());
+    ui->showConsoleCheck->setChecked(m_settings->get("ShowConsole").toBool());
+    ui->autoCloseConsoleCheck->setChecked(m_settings->get("AutoCloseConsole").toBool());
+    ui->showConsoleErrorCheck->setChecked(m_settings->get("ShowConsoleOnError").toBool());
+
+    // Window Size
+    ui->windowSizeGroupBox->setChecked(m_settings->get("OverrideWindow").toBool());
+    ui->maximizedCheckBox->setChecked(m_settings->get("LaunchMaximized").toBool());
+    ui->windowWidthSpinBox->setValue(m_settings->get("MinecraftWinWidth").toInt());
+    ui->windowHeightSpinBox->setValue(m_settings->get("MinecraftWinHeight").toInt());
+
+    // Memory
+    ui->memoryGroupBox->setChecked(m_settings->get("OverrideMemory").toBool());
+    int min = m_settings->get("MinMemAlloc").toInt();
+    int max = m_settings->get("MaxMemAlloc").toInt();
+    if(min < max)
+    {
+        ui->minMemSpinBox->setValue(min);
+        ui->maxMemSpinBox->setValue(max);
+    }
+    else
+    {
+        ui->minMemSpinBox->setValue(max);
+        ui->maxMemSpinBox->setValue(min);
+    }
+    ui->permGenSpinBox->setValue(m_settings->get("PermGen").toInt());
+    bool permGenVisible = m_settings->get("PermGenVisible").toBool();
+    ui->permGenSpinBox->setVisible(permGenVisible);
+    ui->labelPermGen->setVisible(permGenVisible);
+    ui->labelPermgenNote->setVisible(permGenVisible);
+
+
+    // Java Settings
+    bool overrideJava = m_settings->get("OverrideJava").toBool();
+    bool overrideLocation = m_settings->get("OverrideJavaLocation").toBool() || overrideJava;
+    bool overrideArgs = m_settings->get("OverrideJavaArgs").toBool() || overrideJava;
+
+    ui->javaSettingsGroupBox->setChecked(overrideLocation);
+    ui->javaPathTextBox->setText(m_settings->get("JavaPath").toString());
+
+    ui->javaArgumentsGroupBox->setChecked(overrideArgs);
+    ui->jvmArgsTextBox->setPlainText(m_settings->get("JvmArgs").toString());
+
+    // Custom commands
+    ui->customCommands->initialize(
+        true,
+        m_settings->get("OverrideCommands").toBool(),
+        m_settings->get("PreLaunchCommand").toString(),
+        m_settings->get("WrapperCommand").toString(),
+        m_settings->get("PostExitCommand").toString()
+    );
+
+    // Workarounds
+    ui->nativeWorkaroundsGroupBox->setChecked(m_settings->get("OverrideNativeWorkarounds").toBool());
+    ui->useNativeGLFWCheck->setChecked(m_settings->get("UseNativeGLFW").toBool());
+    ui->useNativeOpenALCheck->setChecked(m_settings->get("UseNativeOpenAL").toBool());
+
+    // Miscellanous
+    ui->gameTimeGroupBox->setChecked(m_settings->get("OverrideGameTime").toBool());
+    ui->showGameTime->setChecked(m_settings->get("ShowGameTime").toBool());
+    ui->recordGameTime->setChecked(m_settings->get("RecordGameTime").toBool());
+
+    ui->serverJoinGroupBox->setChecked(m_settings->get("JoinServerOnLaunch").toBool());
+    ui->serverJoinAddress->setText(m_settings->get("JoinServerOnLaunchAddress").toString());
+}
+
+void InstanceSettingsPage::on_javaDetectBtn_clicked()
+{
+    JavaInstallPtr java;
+
+    VersionSelectDialog vselect(APPLICATION->javalist().get(), tr("Select a Java version"), this, true);
+    vselect.setResizeOn(2);
+    vselect.exec();
+
+    if (vselect.result() == QDialog::Accepted && vselect.selectedVersion())
+    {
+        java = std::dynamic_pointer_cast<JavaInstall>(vselect.selectedVersion());
+        ui->javaPathTextBox->setText(java->path);
+        bool visible = java->id.requiresPermGen() && m_settings->get("OverrideMemory").toBool();
+        ui->permGenSpinBox->setVisible(visible);
+        ui->labelPermGen->setVisible(visible);
+        ui->labelPermgenNote->setVisible(visible);
+        m_settings->set("PermGenVisible", visible);
+    }
+}
+
+void InstanceSettingsPage::on_javaBrowseBtn_clicked()
+{
+    QString raw_path = QFileDialog::getOpenFileName(this, tr("Find Java executable"));
+
+    // do not allow current dir - it's dirty. Do not allow dirs that don't exist
+    if(raw_path.isEmpty())
+    {
+        return;
+    }
+    QString cooked_path = FS::NormalizePath(raw_path);
+
+    QFileInfo javaInfo(cooked_path);
+    if(!javaInfo.exists() || !javaInfo.isExecutable())
+    {
+        return;
+    }
+    ui->javaPathTextBox->setText(cooked_path);
+
+    // custom Java could be anything... enable perm gen option
+    ui->permGenSpinBox->setVisible(true);
+    ui->labelPermGen->setVisible(true);
+    ui->labelPermgenNote->setVisible(true);
+    m_settings->set("PermGenVisible", true);
+}
+
+void InstanceSettingsPage::on_javaTestBtn_clicked()
+{
+    if(checker)
+    {
+        return;
+    }
+    checker.reset(new JavaCommon::TestCheck(
+        this, ui->javaPathTextBox->text(), ui->jvmArgsTextBox->toPlainText().replace("\n", " "),
+        ui->minMemSpinBox->value(), ui->maxMemSpinBox->value(), ui->permGenSpinBox->value()));
+    connect(checker.get(), SIGNAL(finished()), SLOT(checkerFinished()));
+    checker->run();
+}
+
+void InstanceSettingsPage::checkerFinished()
+{
+    checker.reset();
+}

launcher/ui/pages/instance/InstanceSettingsPage.h

@@ -0,0 +1,76 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QWidget>
+
+#include "java/JavaChecker.h"
+#include "BaseInstance.h"
+#include <QObjectPtr.h>
+#include "ui/pages/BasePage.h"
+#include "JavaCommon.h"
+#include "Application.h"
+
+class JavaChecker;
+namespace Ui
+{
+class InstanceSettingsPage;
+}
+
+class InstanceSettingsPage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit InstanceSettingsPage(BaseInstance *inst, QWidget *parent = 0);
+    virtual ~InstanceSettingsPage();
+    virtual QString displayName() const override
+    {
+        return tr("Settings");
+    }
+    virtual QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("instance-settings");
+    }
+    virtual QString id() const override
+    {
+        return "settings";
+    }
+    virtual bool apply() override;
+    virtual QString helpPage() const override
+    {
+        return "Instance-settings";
+    }
+    virtual bool shouldDisplay() const override;
+
+private slots:
+    void on_javaDetectBtn_clicked();
+    void on_javaTestBtn_clicked();
+    void on_javaBrowseBtn_clicked();
+
+    void applySettings();
+    void loadSettings();
+
+    void checkerFinished();
+
+    void globalSettingsButtonClicked(bool checked);
+
+private:
+    Ui::InstanceSettingsPage *ui;
+    BaseInstance *m_instance;
+    SettingsObjectPtr m_settings;
+    unique_qobject_ptr<JavaCommon::TestCheck> checker;
+};

launcher/ui/pages/instance/InstanceSettingsPage.ui

@@ -0,0 +1,548 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>InstanceSettingsPage</class>
+ <widget class="QWidget" name="InstanceSettingsPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>691</width>
+    <height>581</height>
+   </rect>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QCommandLinkButton" name="openGlobalJavaSettingsButton">
+     <property name="text">
+      <string>Open Global Settings</string>
+     </property>
+     <property name="description">
+      <string>The settings here are overrides for global settings.</string>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QTabWidget" name="settingsTabs">
+     <property name="tabShape">
+      <enum>QTabWidget::Rounded</enum>
+     </property>
+     <property name="currentIndex">
+      <number>0</number>
+     </property>
+     <widget class="QWidget" name="minecraftTab">
+      <attribute name="title">
+       <string notr="true">Java</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_5">
+       <item>
+        <widget class="QGroupBox" name="javaSettingsGroupBox">
+         <property name="enabled">
+          <bool>true</bool>
+         </property>
+         <property name="title">
+          <string>Java insta&amp;llation</string>
+         </property>
+         <property name="checkable">
+          <bool>true</bool>
+         </property>
+         <property name="checked">
+          <bool>false</bool>
+         </property>
+         <layout class="QGridLayout" name="gridLayout">
+          <item row="0" column="0" colspan="3">
+           <widget class="QLineEdit" name="javaPathTextBox"/>
+          </item>
+          <item row="1" column="0">
+           <widget class="QPushButton" name="javaDetectBtn">
+            <property name="text">
+             <string>Auto-detect...</string>
+            </property>
+           </widget>
+          </item>
+          <item row="1" column="1">
+           <widget class="QPushButton" name="javaBrowseBtn">
+            <property name="text">
+             <string>Browse...</string>
+            </property>
+           </widget>
+          </item>
+          <item row="1" column="2">
+           <widget class="QPushButton" name="javaTestBtn">
+            <property name="text">
+             <string>Test</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="memoryGroupBox">
+         <property name="enabled">
+          <bool>true</bool>
+         </property>
+         <property name="title">
+          <string>Memor&amp;y</string>
+         </property>
+         <property name="checkable">
+          <bool>true</bool>
+         </property>
+         <property name="checked">
+          <bool>false</bool>
+         </property>
+         <layout class="QGridLayout" name="gridLayout_2">
+          <item row="0" column="0">
+           <widget class="QLabel" name="labelMinMem">
+            <property name="text">
+             <string>Minimum memory allocation:</string>
+            </property>
+           </widget>
+          </item>
+          <item row="1" column="1">
+           <widget class="QSpinBox" name="maxMemSpinBox">
+            <property name="toolTip">
+             <string>The maximum amount of memory Minecraft is allowed to use.</string>
+            </property>
+            <property name="suffix">
+             <string notr="true"> MiB</string>
+            </property>
+            <property name="minimum">
+             <number>128</number>
+            </property>
+            <property name="maximum">
+             <number>65536</number>
+            </property>
+            <property name="singleStep">
+             <number>128</number>
+            </property>
+            <property name="value">
+             <number>1024</number>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="1">
+           <widget class="QSpinBox" name="minMemSpinBox">
+            <property name="toolTip">
+             <string>The amount of memory Minecraft is started with.</string>
+            </property>
+            <property name="suffix">
+             <string notr="true"> MiB</string>
+            </property>
+            <property name="minimum">
+             <number>128</number>
+            </property>
+            <property name="maximum">
+             <number>65536</number>
+            </property>
+            <property name="singleStep">
+             <number>128</number>
+            </property>
+            <property name="value">
+             <number>256</number>
+            </property>
+           </widget>
+          </item>
+          <item row="2" column="1">
+           <widget class="QSpinBox" name="permGenSpinBox">
+            <property name="toolTip">
+             <string>The amount of memory available to store loaded Java classes.</string>
+            </property>
+            <property name="suffix">
+             <string notr="true"> MiB</string>
+            </property>
+            <property name="minimum">
+             <number>64</number>
+            </property>
+            <property name="maximum">
+             <number>999999999</number>
+            </property>
+            <property name="singleStep">
+             <number>8</number>
+            </property>
+            <property name="value">
+             <number>64</number>
+            </property>
+           </widget>
+          </item>
+          <item row="2" column="0">
+           <widget class="QLabel" name="labelPermGen">
+            <property name="text">
+             <string notr="true">PermGen:</string>
+            </property>
+           </widget>
+          </item>
+          <item row="1" column="0">
+           <widget class="QLabel" name="labelMaxMem">
+            <property name="text">
+             <string>Maximum memory allocation:</string>
+            </property>
+           </widget>
+          </item>
+          <item row="3" column="0" colspan="2">
+           <widget class="QLabel" name="labelPermgenNote">
+            <property name="text">
+             <string>Note: Permgen is set automatically by Java 8 and later</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="javaArgumentsGroupBox">
+         <property name="enabled">
+          <bool>true</bool>
+         </property>
+         <property name="title">
+          <string>Java argumen&amp;ts</string>
+         </property>
+         <property name="checkable">
+          <bool>true</bool>
+         </property>
+         <property name="checked">
+          <bool>false</bool>
+         </property>
+         <layout class="QGridLayout" name="gridLayout_5">
+          <item row="1" column="1">
+           <widget class="QPlainTextEdit" name="jvmArgsTextBox"/>
+          </item>
+         </layout>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+     <widget class="QWidget" name="javaTab">
+      <attribute name="title">
+       <string>Game windows</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_3">
+       <item>
+        <widget class="QGroupBox" name="windowSizeGroupBox">
+         <property name="enabled">
+          <bool>true</bool>
+         </property>
+         <property name="title">
+          <string>Game Window</string>
+         </property>
+         <property name="checkable">
+          <bool>true</bool>
+         </property>
+         <property name="checked">
+          <bool>false</bool>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_4">
+          <item>
+           <widget class="QCheckBox" name="maximizedCheckBox">
+            <property name="text">
+             <string>Start Minecraft maximized?</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <layout class="QGridLayout" name="gridLayoutWindowSize">
+            <item row="1" column="0">
+             <widget class="QLabel" name="labelWindowHeight">
+              <property name="text">
+               <string>Window height:</string>
+              </property>
+             </widget>
+            </item>
+            <item row="0" column="0">
+             <widget class="QLabel" name="labelWindowWidth">
+              <property name="text">
+               <string>Window width:</string>
+              </property>
+             </widget>
+            </item>
+            <item row="0" column="1">
+             <widget class="QSpinBox" name="windowWidthSpinBox">
+              <property name="minimum">
+               <number>1</number>
+              </property>
+              <property name="maximum">
+               <number>65536</number>
+              </property>
+              <property name="singleStep">
+               <number>1</number>
+              </property>
+              <property name="value">
+               <number>854</number>
+              </property>
+             </widget>
+            </item>
+            <item row="1" column="1">
+             <widget class="QSpinBox" name="windowHeightSpinBox">
+              <property name="minimum">
+               <number>1</number>
+              </property>
+              <property name="maximum">
+               <number>65536</number>
+              </property>
+              <property name="value">
+               <number>480</number>
+              </property>
+             </widget>
+            </item>
+           </layout>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="consoleSettingsBox">
+         <property name="enabled">
+          <bool>true</bool>
+         </property>
+         <property name="title">
+          <string>Conso&amp;le Settings</string>
+         </property>
+         <property name="checkable">
+          <bool>true</bool>
+         </property>
+         <property name="checked">
+          <bool>false</bool>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_2">
+          <item>
+           <widget class="QCheckBox" name="showConsoleCheck">
+            <property name="text">
+             <string>Show console while the game is running?</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QCheckBox" name="autoCloseConsoleCheck">
+            <property name="text">
+             <string>Automatically close console when the game quits?</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QCheckBox" name="showConsoleErrorCheck">
+            <property name="text">
+             <string>Show console when the game crashes?</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacerMinecraft_2">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>88</width>
+           <height>125</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
+     <widget class="QWidget" name="tab">
+      <attribute name="title">
+       <string>Custom commands</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_6">
+       <item>
+        <widget class="CustomCommands" name="customCommands" native="true"/>
+       </item>
+      </layout>
+     </widget>
+     <widget class="QWidget" name="workaroundsPage">
+      <attribute name="title">
+       <string>Workarounds</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_8">
+       <item>
+        <widget class="QGroupBox" name="nativeWorkaroundsGroupBox">
+         <property name="enabled">
+          <bool>true</bool>
+         </property>
+         <property name="title">
+          <string>Native libraries</string>
+         </property>
+         <property name="checkable">
+          <bool>true</bool>
+         </property>
+         <property name="checked">
+          <bool>false</bool>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_7">
+          <item>
+           <widget class="QCheckBox" name="useNativeGLFWCheck">
+            <property name="text">
+             <string>Use system installation of GLFW</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QCheckBox" name="useNativeOpenALCheck">
+            <property name="text">
+             <string>Use system installation of OpenAL</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
+     <widget class="QWidget" name="miscellaneousPage">
+      <attribute name="title">
+       <string>Miscellaneous</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_9">
+       <item>
+        <widget class="QGroupBox" name="gameTimeGroupBox">
+         <property name="enabled">
+          <bool>true</bool>
+         </property>
+         <property name="title">
+          <string>Override global game time settings</string>
+         </property>
+         <property name="checkable">
+          <bool>true</bool>
+         </property>
+         <property name="checked">
+          <bool>false</bool>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_10">
+          <item>
+           <widget class="QCheckBox" name="showGameTime">
+            <property name="text">
+             <string>Show time spent playing this instance</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QCheckBox" name="recordGameTime">
+            <property name="text">
+             <string>Record time spent playing this instance</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="serverJoinGroupBox">
+         <property name="title">
+          <string>Set a server to join on launch</string>
+         </property>
+         <property name="checkable">
+          <bool>true</bool>
+         </property>
+         <property name="checked">
+          <bool>false</bool>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_11">
+          <item>
+           <layout class="QGridLayout" name="serverJoinLayout">
+            <item row="0" column="0">
+             <widget class="QLabel" name="serverJoinAddressLabel">
+              <property name="sizePolicy">
+               <sizepolicy hsizetype="Expanding" vsizetype="Preferred">
+                <horstretch>0</horstretch>
+                <verstretch>0</verstretch>
+               </sizepolicy>
+              </property>
+              <property name="text">
+               <string>Server address:</string>
+              </property>
+             </widget>
+            </item>
+            <item row="0" column="1">
+             <widget class="QLineEdit" name="serverJoinAddress"/>
+            </item>
+           </layout>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacerMiscellaneous">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>CustomCommands</class>
+   <extends>QWidget</extends>
+   <header>ui/widgets/CustomCommands.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <tabstops>
+  <tabstop>openGlobalJavaSettingsButton</tabstop>
+  <tabstop>settingsTabs</tabstop>
+  <tabstop>javaSettingsGroupBox</tabstop>
+  <tabstop>javaPathTextBox</tabstop>
+  <tabstop>javaDetectBtn</tabstop>
+  <tabstop>javaBrowseBtn</tabstop>
+  <tabstop>javaTestBtn</tabstop>
+  <tabstop>memoryGroupBox</tabstop>
+  <tabstop>minMemSpinBox</tabstop>
+  <tabstop>maxMemSpinBox</tabstop>
+  <tabstop>permGenSpinBox</tabstop>
+  <tabstop>javaArgumentsGroupBox</tabstop>
+  <tabstop>jvmArgsTextBox</tabstop>
+  <tabstop>windowSizeGroupBox</tabstop>
+  <tabstop>maximizedCheckBox</tabstop>
+  <tabstop>windowWidthSpinBox</tabstop>
+  <tabstop>windowHeightSpinBox</tabstop>
+  <tabstop>consoleSettingsBox</tabstop>
+  <tabstop>showConsoleCheck</tabstop>
+  <tabstop>autoCloseConsoleCheck</tabstop>
+  <tabstop>showConsoleErrorCheck</tabstop>
+  <tabstop>nativeWorkaroundsGroupBox</tabstop>
+  <tabstop>useNativeGLFWCheck</tabstop>
+  <tabstop>useNativeOpenALCheck</tabstop>
+  <tabstop>showGameTime</tabstop>
+  <tabstop>recordGameTime</tabstop>
+ </tabstops>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/instance/LegacyUpgradePage.cpp

@@ -0,0 +1,51 @@
+#include "LegacyUpgradePage.h"
+#include "ui_LegacyUpgradePage.h"
+
+#include "InstanceList.h"
+#include "minecraft/legacy/LegacyInstance.h"
+#include "minecraft/legacy/LegacyUpgradeTask.h"
+#include "Application.h"
+
+#include "ui/dialogs/CustomMessageBox.h"
+#include "ui/dialogs/ProgressDialog.h"
+
+LegacyUpgradePage::LegacyUpgradePage(InstancePtr inst, QWidget *parent)
+    : QWidget(parent), ui(new Ui::LegacyUpgradePage), m_inst(inst)
+{
+    ui->setupUi(this);
+}
+
+LegacyUpgradePage::~LegacyUpgradePage()
+{
+    delete ui;
+}
+
+void LegacyUpgradePage::runModalTask(Task *task)
+{
+    connect(task, &Task::failed, [this](QString reason)
+        {
+            CustomMessageBox::selectable(this, tr("Error"), reason, QMessageBox::Warning)->show();
+        });
+    ProgressDialog loadDialog(this);
+    loadDialog.setSkipButton(true, tr("Abort"));
+    if(loadDialog.execWithTask(task) == QDialog::Accepted)
+    {
+        m_container->requestClose();
+    }
+}
+
+void LegacyUpgradePage::on_upgradeButton_clicked()
+{
+    QString newName = tr("%1 (Migrated)").arg(m_inst->name());
+    auto upgradeTask = new LegacyUpgradeTask(m_inst);
+    upgradeTask->setName(newName);
+    upgradeTask->setGroup(APPLICATION->instances()->getInstanceGroup(m_inst->id()));
+    upgradeTask->setIcon(m_inst->iconKey());
+    unique_qobject_ptr<Task> task(APPLICATION->instances()->wrapInstanceTask(upgradeTask));
+    runModalTask(task.get());
+}
+
+bool LegacyUpgradePage::shouldDisplay() const
+{
+    return !m_inst->isRunning();
+}

launcher/ui/pages/instance/LegacyUpgradePage.h

@@ -0,0 +1,64 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QWidget>
+
+#include "minecraft/legacy/LegacyInstance.h"
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+#include "tasks/Task.h"
+
+namespace Ui
+{
+class LegacyUpgradePage;
+}
+
+class LegacyUpgradePage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit LegacyUpgradePage(InstancePtr inst, QWidget *parent = 0);
+    virtual ~LegacyUpgradePage();
+    virtual QString displayName() const override
+    {
+        return tr("Upgrade");
+    }
+    virtual QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("checkupdate");
+    }
+    virtual QString id() const override
+    {
+        return "upgrade";
+    }
+    virtual QString helpPage() const override
+    {
+        return "Legacy-upgrade";
+    }
+    virtual bool shouldDisplay() const override;
+
+private slots:
+    void on_upgradeButton_clicked();
+
+private:
+    void runModalTask(Task *task);
+
+private:
+    Ui::LegacyUpgradePage *ui;
+    InstancePtr m_inst;
+};

launcher/ui/pages/instance/LegacyUpgradePage.ui

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>LegacyUpgradePage</class>
+ <widget class="QWidget" name="LegacyUpgradePage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>546</width>
+    <height>405</height>
+   </rect>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout_5">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QTextBrowser" name="textBrowser">
+     <property name="html">
+      <string>&lt;html&gt;&lt;body&gt;&lt;h1&gt;Upgrade is required&lt;/h1&gt;&lt;p&gt;MultiMC now supports old Minecraft versions and all the required features in the new (OneSix) instance format. As a consequence, the old (Legacy) format has been entirely disabled and old instances need to be upgraded.&lt;/p&gt;&lt;p&gt;The upgrade will create a new instance with the same contents as the current one, in the new format. The original instance will remain untouched, in case anything goes wrong in the process.&lt;/p&gt;&lt;p&gt;Please report any issues on our &lt;a href=&quot;https://github.com/MultiMC/Launcher/issues&quot;&gt;github issues page&lt;/a&gt;.&lt;/p&gt;&lt;p&gt;There is also a &lt;a href=&quot;https://discord.gg/GtPmv93&quot;&gt;discord channel for testing here&lt;/a&gt;.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+     </property>
+     <property name="openExternalLinks">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QCommandLinkButton" name="upgradeButton">
+     <property name="text">
+      <string>Upgrade the instance</string>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/instance/LogPage.cpp

@@ -0,0 +1,330 @@
+#include "LogPage.h"
+#include "ui_LogPage.h"
+
+#include "Application.h"
+
+#include <QIcon>
+#include <QScrollBar>
+#include <QShortcut>
+
+#include "launch/LaunchTask.h"
+#include "settings/Setting.h"
+
+#include "ui/GuiUtil.h"
+#include "ui/ColorCache.h"
+
+#include <BuildConfig.h>
+
+class LogFormatProxyModel : public QIdentityProxyModel
+{
+public:
+    LogFormatProxyModel(QObject* parent = nullptr) : QIdentityProxyModel(parent)
+    {
+    }
+    QVariant data(const QModelIndex &index, int role) const override
+    {
+        switch(role)
+        {
+            case Qt::FontRole:
+                return m_font;
+            case Qt::TextColorRole:
+            {
+                MessageLevel::Enum level = (MessageLevel::Enum) QIdentityProxyModel::data(index, LogModel::LevelRole).toInt();
+                return m_colors->getFront(level);
+            }
+            case Qt::BackgroundRole:
+            {
+                MessageLevel::Enum level = (MessageLevel::Enum) QIdentityProxyModel::data(index, LogModel::LevelRole).toInt();
+                return m_colors->getBack(level);
+            }
+            default:
+                return QIdentityProxyModel::data(index, role);
+            }
+    }
+
+    void setFont(QFont font)
+    {
+        m_font = font;
+    }
+
+    void setColors(LogColorCache* colors)
+    {
+        m_colors.reset(colors);
+    }
+
+    QModelIndex find(const QModelIndex &start, const QString &value, bool reverse) const
+    {
+        QModelIndex parentIndex = parent(start);
+        auto compare = [&](int r) -> QModelIndex
+        {
+            QModelIndex idx = index(r, start.column(), parentIndex);
+            if (!idx.isValid() || idx == start)
+            {
+                return QModelIndex();
+            }
+            QVariant v = data(idx, Qt::DisplayRole);
+            QString t = v.toString();
+            if (t.contains(value, Qt::CaseInsensitive))
+                return idx;
+            return QModelIndex();
+        };
+        if(reverse)
+        {
+            int from = start.row();
+            int to = 0;
+
+            for (int i = 0; i < 2; ++i)
+            {
+                for (int r = from; (r >= to); --r)
+                {
+                    auto idx = compare(r);
+                    if(idx.isValid())
+                        return idx;
+                }
+                // prepare for the next iteration
+                from = rowCount() - 1;
+                to = start.row();
+            }
+        }
+        else
+        {
+            int from = start.row();
+            int to = rowCount(parentIndex);
+
+            for (int i = 0; i < 2; ++i)
+            {
+                for (int r = from; (r < to); ++r)
+                {
+                    auto idx = compare(r);
+                    if(idx.isValid())
+                        return idx;
+                }
+                // prepare for the next iteration
+                from = 0;
+                to = start.row();
+            }
+        }
+        return QModelIndex();
+    }
+private:
+    QFont m_font;
+    std::unique_ptr<LogColorCache> m_colors;
+};
+
+LogPage::LogPage(InstancePtr instance, QWidget *parent)
+    : QWidget(parent), ui(new Ui::LogPage), m_instance(instance)
+{
+    ui->setupUi(this);
+    ui->tabWidget->tabBar()->hide();
+
+    m_proxy = new LogFormatProxyModel(this);
+    // set up text colors in the log proxy and adapt them to the current theme foreground and background
+    {
+        auto origForeground = ui->text->palette().color(ui->text->foregroundRole());
+        auto origBackground = ui->text->palette().color(ui->text->backgroundRole());
+        m_proxy->setColors(new LogColorCache(origForeground, origBackground));
+    }
+
+    // set up fonts in the log proxy
+    {
+        QString fontFamily = APPLICATION->settings()->get("ConsoleFont").toString();
+        bool conversionOk = false;
+        int fontSize = APPLICATION->settings()->get("ConsoleFontSize").toInt(&conversionOk);
+        if(!conversionOk)
+        {
+            fontSize = 11;
+        }
+        m_proxy->setFont(QFont(fontFamily, fontSize));
+    }
+
+    ui->text->setModel(m_proxy);
+
+    // set up instance and launch process recognition
+    {
+        auto launchTask = m_instance->getLaunchTask();
+        if(launchTask)
+        {
+            setInstanceLaunchTaskChanged(launchTask, true);
+        }
+        connect(m_instance.get(), &BaseInstance::launchTaskChanged, this, &LogPage::onInstanceLaunchTaskChanged);
+    }
+
+    auto findShortcut = new QShortcut(QKeySequence(QKeySequence::Find), this);
+    connect(findShortcut, SIGNAL(activated()), SLOT(findActivated()));
+    auto findNextShortcut = new QShortcut(QKeySequence(QKeySequence::FindNext), this);
+    connect(findNextShortcut, SIGNAL(activated()), SLOT(findNextActivated()));
+    connect(ui->searchBar, SIGNAL(returnPressed()), SLOT(on_findButton_clicked()));
+    auto findPreviousShortcut = new QShortcut(QKeySequence(QKeySequence::FindPrevious), this);
+    connect(findPreviousShortcut, SIGNAL(activated()), SLOT(findPreviousActivated()));
+}
+
+LogPage::~LogPage()
+{
+    delete ui;
+}
+
+void LogPage::modelStateToUI()
+{
+    if(m_model->wrapLines())
+    {
+        ui->text->setWordWrap(true);
+        ui->wrapCheckbox->setCheckState(Qt::Checked);
+    }
+    else
+    {
+        ui->text->setWordWrap(false);
+        ui->wrapCheckbox->setCheckState(Qt::Unchecked);
+    }
+    if(m_model->suspended())
+    {
+        ui->trackLogCheckbox->setCheckState(Qt::Unchecked);
+    }
+    else
+    {
+        ui->trackLogCheckbox->setCheckState(Qt::Checked);
+    }
+}
+
+void LogPage::UIToModelState()
+{
+    if(!m_model)
+    {
+        return;
+    }
+    m_model->setLineWrap(ui->wrapCheckbox->checkState() == Qt::Checked);
+    m_model->suspend(ui->trackLogCheckbox->checkState() != Qt::Checked);
+}
+
+void LogPage::setInstanceLaunchTaskChanged(shared_qobject_ptr<LaunchTask> proc, bool initial)
+{
+    m_process = proc;
+    if(m_process)
+    {
+        m_model = proc->getLogModel();
+        m_proxy->setSourceModel(m_model.get());
+        if(initial)
+        {
+            modelStateToUI();
+        }
+        else
+        {
+            UIToModelState();
+        }
+    }
+    else
+    {
+        m_proxy->setSourceModel(nullptr);
+        m_model.reset();
+    }
+}
+
+void LogPage::onInstanceLaunchTaskChanged(shared_qobject_ptr<LaunchTask> proc)
+{
+    setInstanceLaunchTaskChanged(proc, false);
+}
+
+bool LogPage::apply()
+{
+    return true;
+}
+
+bool LogPage::shouldDisplay() const
+{
+    return m_instance->isRunning() || m_proxy->rowCount() > 0;
+}
+
+void LogPage::on_btnPaste_clicked()
+{
+    if(!m_model)
+        return;
+
+    //FIXME: turn this into a proper task and move the upload logic out of GuiUtil!
+    m_model->append(
+        MessageLevel::Launcher,
+        QString("%2: Log upload triggered at: %1").arg(
+            QDateTime::currentDateTime().toString(Qt::RFC2822Date),
+            BuildConfig.LAUNCHER_NAME
+        )
+    );
+    auto url = GuiUtil::uploadPaste(m_model->toPlainText(), this);
+    if(!url.isEmpty())
+    {
+        m_model->append(
+            MessageLevel::Launcher,
+            QString("%2: Log uploaded to: %1").arg(
+                url,
+                BuildConfig.LAUNCHER_NAME
+            )
+        );
+    }
+    else
+    {
+        m_model->append(
+            MessageLevel::Error,
+            QString("%1: Log upload failed!").arg(BuildConfig.LAUNCHER_NAME)
+        );
+    }
+}
+
+void LogPage::on_btnCopy_clicked()
+{
+    if(!m_model)
+        return;
+    m_model->append(MessageLevel::Launcher, QString("Clipboard copy at: %1").arg(QDateTime::currentDateTime().toString(Qt::RFC2822Date)));
+    GuiUtil::setClipboardText(m_model->toPlainText());
+}
+
+void LogPage::on_btnClear_clicked()
+{
+    if(!m_model)
+        return;
+    m_model->clear();
+    m_container->refreshContainer();
+}
+
+void LogPage::on_btnBottom_clicked()
+{
+    ui->text->scrollToBottom();
+}
+
+void LogPage::on_trackLogCheckbox_clicked(bool checked)
+{
+    if(!m_model)
+        return;
+    m_model->suspend(!checked);
+}
+
+void LogPage::on_wrapCheckbox_clicked(bool checked)
+{
+    ui->text->setWordWrap(checked);
+    if(!m_model)
+        return;
+    m_model->setLineWrap(checked);
+}
+
+void LogPage::on_findButton_clicked()
+{
+    auto modifiers = QApplication::keyboardModifiers();
+    bool reverse = modifiers & Qt::ShiftModifier;
+    ui->text->findNext(ui->searchBar->text(), reverse);
+}
+
+void LogPage::findNextActivated()
+{
+    ui->text->findNext(ui->searchBar->text(), false);
+}
+
+void LogPage::findPreviousActivated()
+{
+    ui->text->findNext(ui->searchBar->text(), true);
+}
+
+void LogPage::findActivated()
+{
+    // focus the search bar if it doesn't have focus
+    if (!ui->searchBar->hasFocus())
+    {
+        ui->searchBar->setFocus();
+        ui->searchBar->selectAll();
+    }
+}

launcher/ui/pages/instance/LogPage.h

@@ -0,0 +1,86 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QWidget>
+
+#include "BaseInstance.h"
+#include "launch/LaunchTask.h"
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+
+namespace Ui
+{
+class LogPage;
+}
+class QTextCharFormat;
+class LogFormatProxyModel;
+
+class LogPage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit LogPage(InstancePtr instance, QWidget *parent = 0);
+    virtual ~LogPage();
+    virtual QString displayName() const override
+    {
+        return tr("Minecraft Log");
+    }
+    virtual QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("log");
+    }
+    virtual QString id() const override
+    {
+        return "console";
+    }
+    virtual bool apply() override;
+    virtual QString helpPage() const override
+    {
+        return "Minecraft-Logs";
+    }
+    virtual bool shouldDisplay() const override;
+
+private slots:
+    void on_btnPaste_clicked();
+    void on_btnCopy_clicked();
+    void on_btnClear_clicked();
+    void on_btnBottom_clicked();
+
+    void on_trackLogCheckbox_clicked(bool checked);
+    void on_wrapCheckbox_clicked(bool checked);
+
+    void on_findButton_clicked();
+    void findActivated();
+    void findNextActivated();
+    void findPreviousActivated();
+
+    void onInstanceLaunchTaskChanged(shared_qobject_ptr<LaunchTask> proc);
+
+private:
+    void modelStateToUI();
+    void UIToModelState();
+    void setInstanceLaunchTaskChanged(shared_qobject_ptr<LaunchTask> proc, bool initial);
+
+private:
+    Ui::LogPage *ui;
+    InstancePtr m_instance;
+    shared_qobject_ptr<LaunchTask> m_process;
+
+    LogFormatProxyModel * m_proxy;
+    shared_qobject_ptr <LogModel> m_model;
+};

launcher/ui/pages/instance/LogPage.ui

@@ -0,0 +1,182 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>LogPage</class>
+ <widget class="QWidget" name="LogPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>825</width>
+    <height>782</height>
+   </rect>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QTabWidget" name="tabWidget">
+     <property name="currentIndex">
+      <number>0</number>
+     </property>
+     <widget class="QWidget" name="tab">
+      <attribute name="title">
+       <string notr="true">Tab 1</string>
+      </attribute>
+      <layout class="QGridLayout" name="gridLayout">
+       <item row="1" column="0" colspan="5">
+        <widget class="LogView" name="text">
+         <property name="undoRedoEnabled">
+          <bool>false</bool>
+         </property>
+         <property name="readOnly">
+          <bool>true</bool>
+         </property>
+         <property name="plainText">
+          <string notr="true"/>
+         </property>
+         <property name="textInteractionFlags">
+          <set>Qt::LinksAccessibleByKeyboard|Qt::LinksAccessibleByMouse|Qt::TextBrowserInteraction|Qt::TextSelectableByKeyboard|Qt::TextSelectableByMouse</set>
+         </property>
+         <property name="centerOnScroll">
+          <bool>false</bool>
+         </property>
+        </widget>
+       </item>
+       <item row="0" column="0" colspan="5">
+        <layout class="QHBoxLayout" name="horizontalLayout">
+         <item>
+          <widget class="QCheckBox" name="trackLogCheckbox">
+           <property name="text">
+            <string>Keep updating</string>
+           </property>
+           <property name="checked">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QCheckBox" name="wrapCheckbox">
+           <property name="text">
+            <string>Wrap lines</string>
+           </property>
+           <property name="checked">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <spacer name="horizontalSpacer">
+           <property name="orientation">
+            <enum>Qt::Horizontal</enum>
+           </property>
+           <property name="sizeHint" stdset="0">
+            <size>
+             <width>40</width>
+             <height>20</height>
+            </size>
+           </property>
+          </spacer>
+         </item>
+         <item>
+          <widget class="QPushButton" name="btnCopy">
+           <property name="toolTip">
+            <string>Copy the whole log into the clipboard</string>
+           </property>
+           <property name="text">
+            <string>&amp;Copy</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QPushButton" name="btnPaste">
+           <property name="toolTip">
+            <string>Upload the log to paste.ee - it will stay online for a month</string>
+           </property>
+           <property name="text">
+            <string>Upload</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QPushButton" name="btnClear">
+           <property name="toolTip">
+            <string>Clear the log</string>
+           </property>
+           <property name="text">
+            <string>Clear</string>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
+       <item row="2" column="0">
+        <widget class="QLabel" name="label">
+         <property name="text">
+          <string>Search:</string>
+         </property>
+        </widget>
+       </item>
+       <item row="2" column="2">
+        <widget class="QPushButton" name="findButton">
+         <property name="text">
+          <string>Find</string>
+         </property>
+        </widget>
+       </item>
+       <item row="2" column="1">
+        <widget class="QLineEdit" name="searchBar"/>
+       </item>
+       <item row="2" column="4">
+        <widget class="QPushButton" name="btnBottom">
+         <property name="toolTip">
+          <string>Scroll all the way to bottom</string>
+         </property>
+         <property name="text">
+          <string>Bottom</string>
+         </property>
+        </widget>
+       </item>
+       <item row="2" column="3">
+        <widget class="Line" name="line">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>LogView</class>
+   <extends>QPlainTextEdit</extends>
+   <header>ui/widgets/LogView.h</header>
+  </customwidget>
+ </customwidgets>
+ <tabstops>
+  <tabstop>tabWidget</tabstop>
+  <tabstop>trackLogCheckbox</tabstop>
+  <tabstop>wrapCheckbox</tabstop>
+  <tabstop>btnCopy</tabstop>
+  <tabstop>btnPaste</tabstop>
+  <tabstop>btnClear</tabstop>
+  <tabstop>text</tabstop>
+  <tabstop>searchBar</tabstop>
+  <tabstop>findButton</tabstop>
+ </tabstops>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/instance/ModFolderPage.cpp

@@ -0,0 +1,366 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "ModFolderPage.h"
+#include "ui_ModFolderPage.h"
+
+#include <QMessageBox>
+#include <QEvent>
+#include <QKeyEvent>
+#include <QAbstractItemModel>
+#include <QMenu>
+#include <QSortFilterProxyModel>
+
+#include "Application.h"
+
+#include "ui/dialogs/CustomMessageBox.h"
+#include "ui/GuiUtil.h"
+
+#include "DesktopServices.h"
+
+#include "minecraft/mod/ModFolderModel.h"
+#include "minecraft/mod/Mod.h"
+#include "minecraft/VersionFilterData.h"
+#include "minecraft/PackProfile.h"
+
+#include "Version.h"
+
+namespace {
+    // FIXME: wasteful
+    void RemoveThePrefix(QString & string) {
+        QRegularExpression regex(QStringLiteral("^(([Tt][Hh][eE])|([Tt][eE][Hh])) +"));
+        string.remove(regex);
+        string = string.trimmed();
+    }
+}
+
+class ModSortProxy : public QSortFilterProxyModel
+{
+public:
+    explicit ModSortProxy(QObject *parent = 0) : QSortFilterProxyModel(parent)
+    {
+    }
+
+protected:
+    bool filterAcceptsRow(int source_row, const QModelIndex & source_parent) const override {
+        ModFolderModel *model = qobject_cast<ModFolderModel *>(sourceModel());
+        if(!model) {
+            return false;
+        }
+        const auto &mod = model->at(source_row);
+        if(mod.name().contains(filterRegExp())) {
+            return true;
+        }
+        if(mod.description().contains(filterRegExp())) {
+            return true;
+        }
+        for(auto & author: mod.authors()) {
+            if (author.contains(filterRegExp())) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    bool lessThan(const QModelIndex & source_left, const QModelIndex & source_right) const override
+    {
+        ModFolderModel *model = qobject_cast<ModFolderModel *>(sourceModel());
+        if(
+            !model ||
+            !source_left.isValid() ||
+            !source_right.isValid() ||
+            source_left.column() != source_right.column()
+        ) {
+            return QSortFilterProxyModel::lessThan(source_left, source_right);
+        }
+
+        // we are now guaranteed to have two valid indexes in the same column... we love the provided invariants unconditionally and proceed.
+
+        auto column = (ModFolderModel::Columns) source_left.column();
+        bool invert = false;
+        switch(column) {
+            // GH-2550 - sort by enabled/disabled
+            case ModFolderModel::ActiveColumn: {
+                auto dataL = source_left.data(Qt::CheckStateRole).toBool();
+                auto dataR = source_right.data(Qt::CheckStateRole).toBool();
+                if(dataL != dataR) {
+                    return dataL > dataR;
+                }
+                // fallthrough
+                invert = sortOrder() == Qt::DescendingOrder;
+            }
+            // GH-2722 - sort mod names in a way that discards "The" prefixes
+            case ModFolderModel::NameColumn: {
+                auto dataL = model->data(model->index(source_left.row(), ModFolderModel::NameColumn)).toString();
+                RemoveThePrefix(dataL);
+                auto dataR = model->data(model->index(source_right.row(), ModFolderModel::NameColumn)).toString();
+                RemoveThePrefix(dataR);
+
+                auto less = dataL.compare(dataR, sortCaseSensitivity());
+                if(less != 0) {
+                    return invert ? (less > 0) : (less < 0);
+                }
+                // fallthrough
+                invert = sortOrder() == Qt::DescendingOrder;
+            }
+            // GH-2762 - sort versions by parsing them as versions
+            case ModFolderModel::VersionColumn: {
+                auto dataL = Version(model->data(model->index(source_left.row(), ModFolderModel::VersionColumn)).toString());
+                auto dataR = Version(model->data(model->index(source_right.row(), ModFolderModel::VersionColumn)).toString());
+                return invert ? (dataL > dataR) : (dataL < dataR);
+            }
+            default: {
+                return QSortFilterProxyModel::lessThan(source_left, source_right);
+            }
+        }
+    }
+};
+
+ModFolderPage::ModFolderPage(
+    BaseInstance *inst,
+    std::shared_ptr<ModFolderModel> mods,
+    QString id,
+    QString iconName,
+    QString displayName,
+    QString helpPage,
+    QWidget *parent
+) :
+    QMainWindow(parent),
+    ui(new Ui::ModFolderPage)
+{
+    ui->setupUi(this);
+    ui->actionsToolbar->insertSpacer(ui->actionView_configs);
+
+    m_inst = inst;
+    on_RunningState_changed(m_inst && m_inst->isRunning());
+    m_mods = mods;
+    m_id = id;
+    m_displayName = displayName;
+    m_iconName = iconName;
+    m_helpName = helpPage;
+    m_fileSelectionFilter = "%1 (*.zip *.jar)";
+    m_filterModel = new ModSortProxy(this);
+    m_filterModel->setDynamicSortFilter(true);
+    m_filterModel->setFilterCaseSensitivity(Qt::CaseInsensitive);
+    m_filterModel->setSortCaseSensitivity(Qt::CaseInsensitive);
+    m_filterModel->setSourceModel(m_mods.get());
+    m_filterModel->setFilterKeyColumn(-1);
+    ui->modTreeView->setModel(m_filterModel);
+    ui->modTreeView->installEventFilter(this);
+    ui->modTreeView->sortByColumn(1, Qt::AscendingOrder);
+    ui->modTreeView->setContextMenuPolicy(Qt::CustomContextMenu);
+    connect(ui->modTreeView, &ModListView::customContextMenuRequested, this, &ModFolderPage::ShowContextMenu);
+    connect(ui->modTreeView, &ModListView::activated, this, &ModFolderPage::modItemActivated);
+
+    auto smodel = ui->modTreeView->selectionModel();
+    connect(smodel, &QItemSelectionModel::currentChanged, this, &ModFolderPage::modCurrent);
+    connect(ui->filterEdit, &QLineEdit::textChanged, this, &ModFolderPage::on_filterTextChanged);
+    connect(m_inst, &BaseInstance::runningStatusChanged, this, &ModFolderPage::on_RunningState_changed);
+}
+
+void ModFolderPage::modItemActivated(const QModelIndex&)
+{
+    if(!m_controlsEnabled) {
+        return;
+    }
+    auto selection = m_filterModel->mapSelectionToSource(ui->modTreeView->selectionModel()->selection());
+    m_mods->setModStatus(selection.indexes(), ModFolderModel::Toggle);
+}
+
+QMenu * ModFolderPage::createPopupMenu()
+{
+    QMenu* filteredMenu = QMainWindow::createPopupMenu();
+    filteredMenu->removeAction(ui->actionsToolbar->toggleViewAction() );
+    return filteredMenu;
+}
+
+void ModFolderPage::ShowContextMenu(const QPoint& pos)
+{
+    auto menu = ui->actionsToolbar->createContextMenu(this, tr("Context menu"));
+    menu->exec(ui->modTreeView->mapToGlobal(pos));
+    delete menu;
+}
+
+void ModFolderPage::openedImpl()
+{
+    m_mods->startWatching();
+}
+
+void ModFolderPage::closedImpl()
+{
+    m_mods->stopWatching();
+}
+
+void ModFolderPage::on_filterTextChanged(const QString& newContents)
+{
+    m_viewFilter = newContents;
+    m_filterModel->setFilterFixedString(m_viewFilter);
+}
+
+
+CoreModFolderPage::CoreModFolderPage(BaseInstance *inst, std::shared_ptr<ModFolderModel> mods,
+                                     QString id, QString iconName, QString displayName,
+                                     QString helpPage, QWidget *parent)
+    : ModFolderPage(inst, mods, id, iconName, displayName, helpPage, parent)
+{
+}
+
+ModFolderPage::~ModFolderPage()
+{
+    m_mods->stopWatching();
+    delete ui;
+}
+
+void ModFolderPage::on_RunningState_changed(bool running)
+{
+    if(m_controlsEnabled == !running) {
+        return;
+    }
+    m_controlsEnabled = !running;
+    ui->actionAdd->setEnabled(m_controlsEnabled);
+    ui->actionDisable->setEnabled(m_controlsEnabled);
+    ui->actionEnable->setEnabled(m_controlsEnabled);
+    ui->actionRemove->setEnabled(m_controlsEnabled);
+}
+
+bool ModFolderPage::shouldDisplay() const
+{
+    return true;
+}
+
+bool CoreModFolderPage::shouldDisplay() const
+{
+    if (ModFolderPage::shouldDisplay())
+    {
+        auto inst = dynamic_cast<MinecraftInstance *>(m_inst);
+        if (!inst)
+            return true;
+        auto version = inst->getPackProfile();
+        if (!version)
+            return true;
+        if(!version->getComponent("net.minecraftforge"))
+        {
+            return false;
+        }
+        if(!version->getComponent("net.minecraft"))
+        {
+            return false;
+        }
+        if(version->getComponent("net.minecraft")->getReleaseDateTime() < g_VersionFilterData.legacyCutoffDate)
+        {
+            return true;
+        }
+    }
+    return false;
+}
+
+bool ModFolderPage::modListFilter(QKeyEvent *keyEvent)
+{
+    switch (keyEvent->key())
+    {
+    case Qt::Key_Delete:
+        on_actionRemove_triggered();
+        return true;
+    case Qt::Key_Plus:
+        on_actionAdd_triggered();
+        return true;
+    default:
+        break;
+    }
+    return QWidget::eventFilter(ui->modTreeView, keyEvent);
+}
+
+bool ModFolderPage::eventFilter(QObject *obj, QEvent *ev)
+{
+    if (ev->type() != QEvent::KeyPress)
+    {
+        return QWidget::eventFilter(obj, ev);
+    }
+    QKeyEvent *keyEvent = static_cast<QKeyEvent *>(ev);
+    if (obj == ui->modTreeView)
+        return modListFilter(keyEvent);
+    return QWidget::eventFilter(obj, ev);
+}
+
+void ModFolderPage::on_actionAdd_triggered()
+{
+    if(!m_controlsEnabled) {
+        return;
+    }
+    auto list = GuiUtil::BrowseForFiles(
+        m_helpName,
+        tr("Select %1",
+           "Select whatever type of files the page contains. Example: 'Loader Mods'")
+            .arg(m_displayName),
+        m_fileSelectionFilter.arg(m_displayName), APPLICATION->settings()->get("CentralModsDir").toString(),
+        this->parentWidget());
+    if (!list.empty())
+    {
+        for (auto filename : list)
+        {
+            m_mods->installMod(filename);
+        }
+    }
+}
+
+void ModFolderPage::on_actionEnable_triggered()
+{
+    if(!m_controlsEnabled) {
+        return;
+    }
+    auto selection = m_filterModel->mapSelectionToSource(ui->modTreeView->selectionModel()->selection());
+    m_mods->setModStatus(selection.indexes(), ModFolderModel::Enable);
+}
+
+void ModFolderPage::on_actionDisable_triggered()
+{
+    if(!m_controlsEnabled) {
+        return;
+    }
+    auto selection = m_filterModel->mapSelectionToSource(ui->modTreeView->selectionModel()->selection());
+    m_mods->setModStatus(selection.indexes(), ModFolderModel::Disable);
+}
+
+void ModFolderPage::on_actionRemove_triggered()
+{
+    if(!m_controlsEnabled) {
+        return;
+    }
+    auto selection = m_filterModel->mapSelectionToSource(ui->modTreeView->selectionModel()->selection());
+    m_mods->deleteMods(selection.indexes());
+}
+
+void ModFolderPage::on_actionView_configs_triggered()
+{
+    DesktopServices::openDirectory(m_inst->instanceConfigFolder(), true);
+}
+
+void ModFolderPage::on_actionView_Folder_triggered()
+{
+    DesktopServices::openDirectory(m_mods->dir().absolutePath(), true);
+}
+
+void ModFolderPage::modCurrent(const QModelIndex &current, const QModelIndex &previous)
+{
+    if (!current.isValid())
+    {
+        ui->frame->clear();
+        return;
+    }
+    auto sourceCurrent = m_filterModel->mapToSource(current);
+    int row = sourceCurrent.row();
+    Mod &m = m_mods->operator[](row);
+    ui->frame->updateWithMod(m);
+}

launcher/ui/pages/instance/ModFolderPage.h

@@ -0,0 +1,120 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QMainWindow>
+
+#include "minecraft/MinecraftInstance.h"
+#include "ui/pages/BasePage.h"
+
+#include <Application.h>
+
+class ModFolderModel;
+namespace Ui
+{
+class ModFolderPage;
+}
+
+class ModFolderPage : public QMainWindow, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit ModFolderPage(
+        BaseInstance *inst,
+        std::shared_ptr<ModFolderModel> mods,
+        QString id,
+        QString iconName,
+        QString displayName,
+        QString helpPage = "",
+        QWidget *parent = 0
+    );
+    virtual ~ModFolderPage();
+
+    void setFilter(const QString & filter)
+    {
+        m_fileSelectionFilter = filter;
+    }
+
+    virtual QString displayName() const override
+    {
+        return m_displayName;
+    }
+    virtual QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon(m_iconName);
+    }
+    virtual QString id() const override
+    {
+        return m_id;
+    }
+    virtual QString helpPage() const override
+    {
+        return m_helpName;
+    }
+    virtual bool shouldDisplay() const override;
+
+    virtual void openedImpl() override;
+    virtual void closedImpl() override;
+protected:
+    bool eventFilter(QObject *obj, QEvent *ev) override;
+    bool modListFilter(QKeyEvent *ev);
+    QMenu * createPopupMenu() override;
+
+protected:
+    BaseInstance *m_inst = nullptr;
+
+protected:
+    Ui::ModFolderPage *ui = nullptr;
+    std::shared_ptr<ModFolderModel> m_mods;
+    QSortFilterProxyModel *m_filterModel = nullptr;
+    QString m_iconName;
+    QString m_id;
+    QString m_displayName;
+    QString m_helpName;
+    QString m_fileSelectionFilter;
+    QString m_viewFilter;
+    bool m_controlsEnabled = true;
+
+public
+slots:
+    void modCurrent(const QModelIndex &current, const QModelIndex &previous);
+
+private
+slots:
+    void modItemActivated(const QModelIndex &index);
+    void on_filterTextChanged(const QString & newContents);
+    void on_RunningState_changed(bool running);
+    void on_actionAdd_triggered();
+    void on_actionRemove_triggered();
+    void on_actionEnable_triggered();
+    void on_actionDisable_triggered();
+    void on_actionView_Folder_triggered();
+    void on_actionView_configs_triggered();
+    void ShowContextMenu(const QPoint &pos);
+};
+
+class CoreModFolderPage : public ModFolderPage
+{
+public:
+    explicit CoreModFolderPage(BaseInstance *inst, std::shared_ptr<ModFolderModel> mods, QString id,
+                               QString iconName, QString displayName, QString helpPage = "",
+                               QWidget *parent = 0);
+    virtual ~CoreModFolderPage()
+    {
+    }
+    virtual bool shouldDisplay() const;
+};

launcher/ui/pages/instance/ModFolderPage.ui

@@ -0,0 +1,164 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>ModFolderPage</class>
+ <widget class="QMainWindow" name="ModFolderPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>1042</width>
+    <height>501</height>
+   </rect>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QGridLayout" name="gridLayout">
+    <property name="leftMargin">
+     <number>0</number>
+    </property>
+    <property name="topMargin">
+     <number>0</number>
+    </property>
+    <property name="rightMargin">
+     <number>0</number>
+    </property>
+    <property name="bottomMargin">
+     <number>0</number>
+    </property>
+    <item row="4" column="1" colspan="3">
+     <layout class="QGridLayout" name="gridLayout_2">
+      <item row="0" column="1">
+       <widget class="QLineEdit" name="filterEdit">
+        <property name="clearButtonEnabled">
+         <bool>true</bool>
+        </property>
+       </widget>
+      </item>
+      <item row="0" column="0">
+       <widget class="QLabel" name="filterLabel">
+        <property name="text">
+         <string>Filter:</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </item>
+    <item row="2" column="1" colspan="3">
+     <widget class="MCModInfoFrame" name="frame">
+      <property name="sizePolicy">
+       <sizepolicy hsizetype="Preferred" vsizetype="Minimum">
+        <horstretch>0</horstretch>
+        <verstretch>0</verstretch>
+       </sizepolicy>
+      </property>
+     </widget>
+    </item>
+    <item row="1" column="1" colspan="3">
+     <widget class="ModListView" name="modTreeView">
+      <property name="sizePolicy">
+       <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+        <horstretch>0</horstretch>
+        <verstretch>0</verstretch>
+       </sizepolicy>
+      </property>
+      <property name="acceptDrops">
+       <bool>true</bool>
+      </property>
+      <property name="dragDropMode">
+       <enum>QAbstractItemView::DropOnly</enum>
+      </property>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+  <widget class="WideBar" name="actionsToolbar">
+   <property name="windowTitle">
+    <string>Actions</string>
+   </property>
+   <property name="toolButtonStyle">
+    <enum>Qt::ToolButtonTextOnly</enum>
+   </property>
+   <attribute name="toolBarArea">
+    <enum>RightToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+   <addaction name="actionAdd"/>
+   <addaction name="separator"/>
+   <addaction name="actionRemove"/>
+   <addaction name="actionEnable"/>
+   <addaction name="actionDisable"/>
+   <addaction name="actionView_configs"/>
+   <addaction name="actionView_Folder"/>
+  </widget>
+  <action name="actionAdd">
+   <property name="text">
+    <string>&amp;Add</string>
+   </property>
+   <property name="toolTip">
+    <string>Add mods</string>
+   </property>
+  </action>
+  <action name="actionRemove">
+   <property name="text">
+    <string>&amp;Remove</string>
+   </property>
+   <property name="toolTip">
+    <string>Remove selected mods</string>
+   </property>
+  </action>
+  <action name="actionEnable">
+   <property name="text">
+    <string>&amp;Enable</string>
+   </property>
+   <property name="toolTip">
+    <string>Enable selected mods</string>
+   </property>
+  </action>
+  <action name="actionDisable">
+   <property name="text">
+    <string>&amp;Disable</string>
+   </property>
+   <property name="toolTip">
+    <string>Disable selected mods</string>
+   </property>
+  </action>
+  <action name="actionView_configs">
+   <property name="text">
+    <string>View &amp;Configs</string>
+   </property>
+   <property name="toolTip">
+    <string>Open the 'config' folder in the system file manager.</string>
+   </property>
+  </action>
+  <action name="actionView_Folder">
+   <property name="text">
+    <string>View &amp;Folder</string>
+   </property>
+  </action>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>ModListView</class>
+   <extends>QTreeView</extends>
+   <header>ui/widgets/ModListView.h</header>
+  </customwidget>
+  <customwidget>
+   <class>MCModInfoFrame</class>
+   <extends>QFrame</extends>
+   <header>ui/widgets/MCModInfoFrame.h</header>
+   <container>1</container>
+  </customwidget>
+  <customwidget>
+   <class>WideBar</class>
+   <extends>QToolBar</extends>
+   <header>ui/widgets/WideBar.h</header>
+  </customwidget>
+ </customwidgets>
+ <tabstops>
+  <tabstop>modTreeView</tabstop>
+  <tabstop>filterEdit</tabstop>
+ </tabstops>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/instance/NotesPage.cpp

@@ -0,0 +1,21 @@
+#include "NotesPage.h"
+#include "ui_NotesPage.h"
+#include <QTabBar>
+
+NotesPage::NotesPage(BaseInstance *inst, QWidget *parent)
+    : QWidget(parent), ui(new Ui::NotesPage), m_inst(inst)
+{
+    ui->setupUi(this);
+    ui->noteEditor->setText(m_inst->notes());
+}
+
+NotesPage::~NotesPage()
+{
+    delete ui;
+}
+
+bool NotesPage::apply()
+{
+    m_inst->setNotes(ui->noteEditor->toPlainText());
+    return true;
+}

launcher/ui/pages/instance/NotesPage.h

@@ -0,0 +1,60 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QWidget>
+
+#include "BaseInstance.h"
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+
+namespace Ui
+{
+class NotesPage;
+}
+
+class NotesPage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit NotesPage(BaseInstance *inst, QWidget *parent = 0);
+    virtual ~NotesPage();
+    virtual QString displayName() const override
+    {
+        return tr("Notes");
+    }
+    virtual QIcon icon() const override
+    {
+        auto icon = APPLICATION->getThemedIcon("notes");
+        if(icon.isNull())
+            icon = APPLICATION->getThemedIcon("news");
+        return icon;
+    }
+    virtual QString id() const override
+    {
+        return "notes";
+    }
+    virtual bool apply() override;
+    virtual QString helpPage() const override
+    {
+        return "Notes";
+    }
+
+private:
+    Ui::NotesPage *ui;
+    BaseInstance *m_inst;
+};

launcher/ui/pages/instance/NotesPage.ui

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>NotesPage</class>
+ <widget class="QWidget" name="NotesPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>731</width>
+    <height>538</height>
+   </rect>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QTextEdit" name="noteEditor">
+     <property name="verticalScrollBarPolicy">
+      <enum>Qt::ScrollBarAlwaysOn</enum>
+     </property>
+     <property name="tabChangesFocus">
+      <bool>true</bool>
+     </property>
+     <property name="acceptRichText">
+      <bool>false</bool>
+     </property>
+     <property name="textInteractionFlags">
+      <set>Qt::LinksAccessibleByKeyboard|Qt::LinksAccessibleByMouse|Qt::TextBrowserInteraction|Qt::TextEditable|Qt::TextEditorInteraction|Qt::TextSelectableByKeyboard|Qt::TextSelectableByMouse</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <tabstops>
+  <tabstop>noteEditor</tabstop>
+ </tabstops>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/instance/OtherLogsPage.cpp

@@ -0,0 +1,314 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "OtherLogsPage.h"
+#include "ui_OtherLogsPage.h"
+
+#include <QMessageBox>
+
+#include "ui/GuiUtil.h"
+
+#include "RecursiveFileSystemWatcher.h"
+#include <GZip.h>
+#include <FileSystem.h>
+#include <QShortcut>
+
+OtherLogsPage::OtherLogsPage(QString path, IPathMatcher::Ptr fileFilter, QWidget *parent)
+    : QWidget(parent), ui(new Ui::OtherLogsPage), m_path(path), m_fileFilter(fileFilter),
+      m_watcher(new RecursiveFileSystemWatcher(this))
+{
+    ui->setupUi(this);
+    ui->tabWidget->tabBar()->hide();
+
+    m_watcher->setMatcher(fileFilter);
+    m_watcher->setRootDir(QDir::current().absoluteFilePath(m_path));
+
+    connect(m_watcher, &RecursiveFileSystemWatcher::filesChanged, this, &OtherLogsPage::populateSelectLogBox);
+    populateSelectLogBox();
+
+    auto findShortcut = new QShortcut(QKeySequence(QKeySequence::Find), this);
+    connect(findShortcut, &QShortcut::activated, this, &OtherLogsPage::findActivated);
+
+    auto findNextShortcut = new QShortcut(QKeySequence(QKeySequence::FindNext), this);
+    connect(findNextShortcut, &QShortcut::activated, this, &OtherLogsPage::findNextActivated);
+
+    auto findPreviousShortcut = new QShortcut(QKeySequence(QKeySequence::FindPrevious), this);
+    connect(findPreviousShortcut, &QShortcut::activated, this, &OtherLogsPage::findPreviousActivated);
+
+    connect(ui->searchBar, &QLineEdit::returnPressed, this, &OtherLogsPage::on_findButton_clicked);
+}
+
+OtherLogsPage::~OtherLogsPage()
+{
+    delete ui;
+}
+
+void OtherLogsPage::openedImpl()
+{
+    m_watcher->enable();
+}
+void OtherLogsPage::closedImpl()
+{
+    m_watcher->disable();
+}
+
+void OtherLogsPage::populateSelectLogBox()
+{
+    ui->selectLogBox->clear();
+    ui->selectLogBox->addItems(m_watcher->files());
+    if (m_currentFile.isEmpty())
+    {
+        setControlsEnabled(false);
+        ui->selectLogBox->setCurrentIndex(-1);
+    }
+    else
+    {
+        const int index = ui->selectLogBox->findText(m_currentFile);
+        if (index != -1)
+        {
+            ui->selectLogBox->setCurrentIndex(index);
+            setControlsEnabled(true);
+        }
+        else
+        {
+            setControlsEnabled(false);
+        }
+    }
+}
+
+void OtherLogsPage::on_selectLogBox_currentIndexChanged(const int index)
+{
+    QString file;
+    if (index != -1)
+    {
+        file = ui->selectLogBox->itemText(index);
+    }
+
+    if (file.isEmpty() || !QFile::exists(FS::PathCombine(m_path, file)))
+    {
+        m_currentFile = QString();
+        ui->text->clear();
+        setControlsEnabled(false);
+    }
+    else
+    {
+        m_currentFile = file;
+        on_btnReload_clicked();
+        setControlsEnabled(true);
+    }
+}
+
+void OtherLogsPage::on_btnReload_clicked()
+{
+    if(m_currentFile.isEmpty())
+    {
+        setControlsEnabled(false);
+        return;
+    }
+    QFile file(FS::PathCombine(m_path, m_currentFile));
+    if (!file.open(QFile::ReadOnly))
+    {
+        setControlsEnabled(false);
+        ui->btnReload->setEnabled(true); // allow reload
+        m_currentFile = QString();
+        QMessageBox::critical(this, tr("Error"), tr("Unable to open %1 for reading: %2")
+                                                     .arg(m_currentFile, file.errorString()));
+    }
+    else
+    {
+        auto setPlainText = [&](const QString & text)
+        {
+            QString fontFamily = APPLICATION->settings()->get("ConsoleFont").toString();
+            bool conversionOk = false;
+            int fontSize = APPLICATION->settings()->get("ConsoleFontSize").toInt(&conversionOk);
+            if(!conversionOk)
+            {
+                fontSize = 11;
+            }
+            QTextDocument *doc = ui->text->document();
+            doc->setDefaultFont(QFont(fontFamily, fontSize));
+            ui->text->setPlainText(text);
+        };
+        auto showTooBig = [&]()
+        {
+            setPlainText(
+                tr("The file (%1) is too big. You may want to open it in a viewer optimized "
+                   "for large files.").arg(file.fileName()));
+        };
+        if(file.size() > (1024ll * 1024ll * 12ll))
+        {
+            showTooBig();
+            return;
+        }
+        QString content;
+        if(file.fileName().endsWith(".gz"))
+        {
+            QByteArray temp;
+            if(!GZip::unzip(file.readAll(), temp))
+            {
+                setPlainText(
+                    tr("The file (%1) is not readable.").arg(file.fileName()));
+                return;
+            }
+            content = QString::fromUtf8(temp);
+        }
+        else
+        {
+            content = QString::fromUtf8(file.readAll());
+        }
+        if (content.size() >= 50000000ll)
+        {
+            showTooBig();
+            return;
+        }
+        setPlainText(content);
+    }
+}
+
+void OtherLogsPage::on_btnPaste_clicked()
+{
+    GuiUtil::uploadPaste(ui->text->toPlainText(), this);
+}
+
+void OtherLogsPage::on_btnCopy_clicked()
+{
+    GuiUtil::setClipboardText(ui->text->toPlainText());
+}
+
+void OtherLogsPage::on_btnDelete_clicked()
+{
+    if(m_currentFile.isEmpty())
+    {
+        setControlsEnabled(false);
+        return;
+    }
+    if (QMessageBox::question(this, tr("Delete"),
+                              tr("Do you really want to delete %1?").arg(m_currentFile),
+                              QMessageBox::Yes, QMessageBox::No) == QMessageBox::No)
+    {
+        return;
+    }
+    QFile file(FS::PathCombine(m_path, m_currentFile));
+    if (!file.remove())
+    {
+        QMessageBox::critical(this, tr("Error"), tr("Unable to delete %1: %2")
+                                                     .arg(m_currentFile, file.errorString()));
+    }
+}
+
+
+
+void OtherLogsPage::on_btnClean_clicked()
+{
+    auto toDelete = m_watcher->files();
+    if(toDelete.isEmpty())
+    {
+        return;
+    }
+    QMessageBox *messageBox = new QMessageBox(this);
+    messageBox->setWindowTitle(tr("Clean up"));
+    if(toDelete.size() > 5)
+    {
+        messageBox->setText(tr("Do you really want to delete all log files?"));
+        messageBox->setDetailedText(toDelete.join('\n'));
+    }
+    else
+    {
+        messageBox->setText(tr("Do you really want to delete these files?\n%1").arg(toDelete.join('\n')));
+    }
+    messageBox->setStandardButtons(QMessageBox::Ok | QMessageBox::Cancel);
+    messageBox->setDefaultButton(QMessageBox::Ok);
+    messageBox->setTextInteractionFlags(Qt::TextSelectableByMouse);
+    messageBox->setIcon(QMessageBox::Question);
+    messageBox->setTextInteractionFlags(Qt::TextBrowserInteraction);
+
+    if (messageBox->exec() != QMessageBox::Ok)
+    {
+        return;
+    }
+    QStringList failed;
+    for(auto item: toDelete)
+    {
+        QFile file(FS::PathCombine(m_path, item));
+        if (!file.remove())
+        {
+            failed.push_back(item);
+        }
+    }
+    if(!failed.empty())
+    {
+        QMessageBox *messageBox = new QMessageBox(this);
+        messageBox->setWindowTitle(tr("Error"));
+        if(failed.size() > 5)
+        {
+            messageBox->setText(tr("Couldn't delete some files!"));
+            messageBox->setDetailedText(failed.join('\n'));
+        }
+        else
+        {
+            messageBox->setText(tr("Couldn't delete some files:\n%1").arg(failed.join('\n')));
+        }
+        messageBox->setStandardButtons(QMessageBox::Ok);
+        messageBox->setDefaultButton(QMessageBox::Ok);
+        messageBox->setTextInteractionFlags(Qt::TextSelectableByMouse);
+        messageBox->setIcon(QMessageBox::Critical);
+        messageBox->setTextInteractionFlags(Qt::TextBrowserInteraction);
+        messageBox->exec();
+    }
+}
+
+
+void OtherLogsPage::setControlsEnabled(const bool enabled)
+{
+    ui->btnReload->setEnabled(enabled);
+    ui->btnDelete->setEnabled(enabled);
+    ui->btnCopy->setEnabled(enabled);
+    ui->btnPaste->setEnabled(enabled);
+    ui->text->setEnabled(enabled);
+    ui->btnClean->setEnabled(enabled);
+}
+
+// FIXME: HACK, use LogView instead?
+static void findNext(QPlainTextEdit * _this, const QString& what, bool reverse)
+{
+    _this->find(what, reverse ? QTextDocument::FindFlag::FindBackward : QTextDocument::FindFlag(0));
+}
+
+void OtherLogsPage::on_findButton_clicked()
+{
+    auto modifiers = QApplication::keyboardModifiers();
+    bool reverse = modifiers & Qt::ShiftModifier;
+    findNext(ui->text, ui->searchBar->text(), reverse);
+}
+
+void OtherLogsPage::findNextActivated()
+{
+    findNext(ui->text, ui->searchBar->text(), false);
+}
+
+void OtherLogsPage::findPreviousActivated()
+{
+    findNext(ui->text, ui->searchBar->text(), true);
+}
+
+void OtherLogsPage::findActivated()
+{
+    // focus the search bar if it doesn't have focus
+    if (!ui->searchBar->hasFocus())
+    {
+        ui->searchBar->setFocus();
+        ui->searchBar->selectAll();
+    }
+}

launcher/ui/pages/instance/OtherLogsPage.h

@@ -0,0 +1,81 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QWidget>
+
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+#include <pathmatcher/IPathMatcher.h>
+
+namespace Ui
+{
+class OtherLogsPage;
+}
+
+class RecursiveFileSystemWatcher;
+
+class OtherLogsPage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit OtherLogsPage(QString path, IPathMatcher::Ptr fileFilter, QWidget *parent = 0);
+    ~OtherLogsPage();
+
+    QString id() const override
+    {
+        return "logs";
+    }
+    QString displayName() const override
+    {
+        return tr("Other logs");
+    }
+    QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("log");
+    }
+    QString helpPage() const override
+    {
+        return "Minecraft-Logs";
+    }
+    void openedImpl() override;
+    void closedImpl() override;
+
+private slots:
+    void populateSelectLogBox();
+    void on_selectLogBox_currentIndexChanged(const int index);
+    void on_btnReload_clicked();
+    void on_btnPaste_clicked();
+    void on_btnCopy_clicked();
+    void on_btnDelete_clicked();
+    void on_btnClean_clicked();
+
+    void on_findButton_clicked();
+    void findActivated();
+    void findNextActivated();
+    void findPreviousActivated();
+
+private:
+    void setControlsEnabled(const bool enabled);
+
+private:
+    Ui::OtherLogsPage *ui;
+    QString m_path;
+    QString m_currentFile;
+    IPathMatcher::Ptr m_fileFilter;
+    RecursiveFileSystemWatcher *m_watcher;
+};

launcher/ui/pages/instance/OtherLogsPage.ui

@@ -0,0 +1,150 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>OtherLogsPage</class>
+ <widget class="QWidget" name="OtherLogsPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>657</width>
+    <height>538</height>
+   </rect>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout_2">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QTabWidget" name="tabWidget">
+     <property name="currentIndex">
+      <number>0</number>
+     </property>
+     <widget class="QWidget" name="tab">
+      <attribute name="title">
+       <string notr="true">Tab 1</string>
+      </attribute>
+      <layout class="QGridLayout" name="gridLayout_2">
+       <item row="2" column="1">
+        <widget class="QLineEdit" name="searchBar"/>
+       </item>
+       <item row="2" column="2">
+        <widget class="QPushButton" name="findButton">
+         <property name="text">
+          <string>Find</string>
+         </property>
+        </widget>
+       </item>
+       <item row="1" column="0" colspan="4">
+        <widget class="QPlainTextEdit" name="text">
+         <property name="enabled">
+          <bool>false</bool>
+         </property>
+         <property name="verticalScrollBarPolicy">
+          <enum>Qt::ScrollBarAlwaysOn</enum>
+         </property>
+         <property name="readOnly">
+          <bool>true</bool>
+         </property>
+         <property name="textInteractionFlags">
+          <set>Qt::LinksAccessibleByKeyboard|Qt::LinksAccessibleByMouse|Qt::TextBrowserInteraction|Qt::TextSelectableByKeyboard|Qt::TextSelectableByMouse</set>
+         </property>
+        </widget>
+       </item>
+       <item row="0" column="0" colspan="4">
+        <layout class="QGridLayout" name="gridLayout">
+         <item row="3" column="1">
+          <widget class="QPushButton" name="btnCopy">
+           <property name="toolTip">
+            <string>Copy the whole log into the clipboard</string>
+           </property>
+           <property name="text">
+            <string>&amp;Copy</string>
+           </property>
+          </widget>
+         </item>
+         <item row="3" column="3">
+          <widget class="QPushButton" name="btnDelete">
+           <property name="toolTip">
+            <string>Clear the log</string>
+           </property>
+           <property name="text">
+            <string>Delete</string>
+           </property>
+          </widget>
+         </item>
+         <item row="3" column="2">
+          <widget class="QPushButton" name="btnPaste">
+           <property name="toolTip">
+            <string>Upload the log to paste.ee - it will stay online for a month</string>
+           </property>
+           <property name="text">
+            <string>Upload</string>
+           </property>
+          </widget>
+         </item>
+         <item row="3" column="4">
+          <widget class="QPushButton" name="btnClean">
+           <property name="toolTip">
+            <string>Clear the log</string>
+           </property>
+           <property name="text">
+            <string>Clean</string>
+           </property>
+          </widget>
+         </item>
+         <item row="3" column="0">
+          <widget class="QPushButton" name="btnReload">
+           <property name="text">
+            <string>Reload</string>
+           </property>
+          </widget>
+         </item>
+         <item row="0" column="0" colspan="5">
+          <widget class="QComboBox" name="selectLogBox">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
+       <item row="2" column="0">
+        <widget class="QLabel" name="label">
+         <property name="text">
+          <string>Search:</string>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <tabstops>
+  <tabstop>tabWidget</tabstop>
+  <tabstop>selectLogBox</tabstop>
+  <tabstop>btnReload</tabstop>
+  <tabstop>btnCopy</tabstop>
+  <tabstop>btnPaste</tabstop>
+  <tabstop>btnDelete</tabstop>
+  <tabstop>btnClean</tabstop>
+  <tabstop>text</tabstop>
+  <tabstop>searchBar</tabstop>
+  <tabstop>findButton</tabstop>
+ </tabstops>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/instance/ResourcePackPage.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include "ModFolderPage.h"
+#include "ui_ModFolderPage.h"
+
+class ResourcePackPage : public ModFolderPage
+{
+    Q_OBJECT
+public:
+    explicit ResourcePackPage(MinecraftInstance *instance, QWidget *parent = 0)
+        : ModFolderPage(instance, instance->resourcePackList(), "resourcepacks",
+                        "resourcepacks", tr("Resource packs"), "Resource-packs", parent)
+    {
+        ui->actionView_configs->setVisible(false);
+    }
+    virtual ~ResourcePackPage() {}
+
+    virtual bool shouldDisplay() const override
+    {
+        return !m_inst->traits().contains("no-texturepacks") &&
+               !m_inst->traits().contains("texturepacks");
+    }
+};

launcher/ui/pages/instance/ScreenshotsPage.cpp

@@ -0,0 +1,423 @@
+#include "ScreenshotsPage.h"
+#include "ui_ScreenshotsPage.h"
+
+#include <QModelIndex>
+#include <QMutableListIterator>
+#include <QMap>
+#include <QSet>
+#include <QFileIconProvider>
+#include <QFileSystemModel>
+#include <QStyledItemDelegate>
+#include <QLineEdit>
+#include <QEvent>
+#include <QPainter>
+#include <QClipboard>
+#include <QKeyEvent>
+#include <QMenu>
+
+#include <Application.h>
+
+#include "ui/dialogs/ProgressDialog.h"
+#include "ui/dialogs/CustomMessageBox.h"
+
+#include "net/NetJob.h"
+#include "screenshots/ImgurUpload.h"
+#include "screenshots/ImgurAlbumCreation.h"
+#include "tasks/SequentialTask.h"
+
+#include "RWStorage.h"
+#include <FileSystem.h>
+#include <DesktopServices.h>
+
+typedef RWStorage<QString, QIcon> SharedIconCache;
+typedef std::shared_ptr<SharedIconCache> SharedIconCachePtr;
+
+class ThumbnailingResult : public QObject
+{
+    Q_OBJECT
+public slots:
+    inline void emitResultsReady(const QString &path) { emit resultsReady(path); }
+    inline void emitResultsFailed(const QString &path) { emit resultsFailed(path); }
+signals:
+    void resultsReady(const QString &path);
+    void resultsFailed(const QString &path);
+};
+
+class ThumbnailRunnable : public QRunnable
+{
+public:
+    ThumbnailRunnable(QString path, SharedIconCachePtr cache)
+    {
+        m_path = path;
+        m_cache = cache;
+    }
+    void run()
+    {
+        QFileInfo info(m_path);
+        if (info.isDir())
+            return;
+        if ((info.suffix().compare("png", Qt::CaseInsensitive) != 0))
+            return;
+        int tries = 5;
+        while (tries)
+        {
+            if (!m_cache->stale(m_path))
+                return;
+            QImage image(m_path);
+            if (image.isNull())
+            {
+                QThread::msleep(500);
+                tries--;
+                continue;
+            }
+            QImage small;
+            if (image.width() > image.height())
+                small = image.scaledToWidth(512).scaledToWidth(256, Qt::SmoothTransformation);
+            else
+                small = image.scaledToHeight(512).scaledToHeight(256, Qt::SmoothTransformation);
+            QPoint offset((256 - small.width()) / 2, (256 - small.height()) / 2);
+            QImage square(QSize(256, 256), QImage::Format_ARGB32);
+            square.fill(Qt::transparent);
+
+            QPainter painter(&square);
+            painter.drawImage(offset, small);
+            painter.end();
+
+            QIcon icon(QPixmap::fromImage(square));
+            m_cache->add(m_path, icon);
+            m_resultEmitter.emitResultsReady(m_path);
+            return;
+        }
+        m_resultEmitter.emitResultsFailed(m_path);
+    }
+    QString m_path;
+    SharedIconCachePtr m_cache;
+    ThumbnailingResult m_resultEmitter;
+};
+
+// this is about as elegant and well written as a bag of bricks with scribbles done by insane
+// asylum patients.
+class FilterModel : public QIdentityProxyModel
+{
+    Q_OBJECT
+public:
+    explicit FilterModel(QObject *parent = 0) : QIdentityProxyModel(parent)
+    {
+        m_thumbnailingPool.setMaxThreadCount(4);
+        m_thumbnailCache = std::make_shared<SharedIconCache>();
+        m_thumbnailCache->add("placeholder", APPLICATION->getThemedIcon("screenshot-placeholder"));
+        connect(&watcher, SIGNAL(fileChanged(QString)), SLOT(fileChanged(QString)));
+        // FIXME: the watched file set is not updated when files are removed
+    }
+    virtual ~FilterModel() { m_thumbnailingPool.waitForDone(500); }
+    virtual QVariant data(const QModelIndex &proxyIndex, int role = Qt::DisplayRole) const
+    {
+        auto model = sourceModel();
+        if (!model)
+            return QVariant();
+        if (role == Qt::DisplayRole || role == Qt::EditRole)
+        {
+            QVariant result = sourceModel()->data(mapToSource(proxyIndex), role);
+            return result.toString().remove(QRegExp("\\.png$"));
+        }
+        if (role == Qt::DecorationRole)
+        {
+            QVariant result =
+                sourceModel()->data(mapToSource(proxyIndex), QFileSystemModel::FilePathRole);
+            QString filePath = result.toString();
+            QIcon temp;
+            if (!watched.contains(filePath))
+            {
+                ((QFileSystemWatcher &)watcher).addPath(filePath);
+                ((QSet<QString> &)watched).insert(filePath);
+            }
+            if (m_thumbnailCache->get(filePath, temp))
+            {
+                return temp;
+            }
+            if (!m_failed.contains(filePath))
+            {
+                ((FilterModel *)this)->thumbnailImage(filePath);
+            }
+            return (m_thumbnailCache->get("placeholder"));
+        }
+        return sourceModel()->data(mapToSource(proxyIndex), role);
+    }
+    virtual bool setData(const QModelIndex &index, const QVariant &value,
+                         int role = Qt::EditRole)
+    {
+        auto model = sourceModel();
+        if (!model)
+            return false;
+        if (role != Qt::EditRole)
+            return false;
+        // FIXME: this is a workaround for a bug in QFileSystemModel, where it doesn't
+        // sort after renames
+        {
+            ((QFileSystemModel *)model)->setNameFilterDisables(true);
+            ((QFileSystemModel *)model)->setNameFilterDisables(false);
+        }
+        return model->setData(mapToSource(index), value.toString() + ".png", role);
+    }
+
+private:
+    void thumbnailImage(QString path)
+    {
+        auto runnable = new ThumbnailRunnable(path, m_thumbnailCache);
+        connect(&(runnable->m_resultEmitter), SIGNAL(resultsReady(QString)),
+                SLOT(thumbnailReady(QString)));
+        connect(&(runnable->m_resultEmitter), SIGNAL(resultsFailed(QString)),
+                SLOT(thumbnailFailed(QString)));
+        ((QThreadPool &)m_thumbnailingPool).start(runnable);
+    }
+private slots:
+    void thumbnailReady(QString path) { emit layoutChanged(); }
+    void thumbnailFailed(QString path) { m_failed.insert(path); }
+    void fileChanged(QString filepath)
+    {
+        m_thumbnailCache->setStale(filepath);
+        thumbnailImage(filepath);
+        // reinsert the path...
+        watcher.removePath(filepath);
+        watcher.addPath(filepath);
+    }
+
+private:
+    SharedIconCachePtr m_thumbnailCache;
+    QThreadPool m_thumbnailingPool;
+    QSet<QString> m_failed;
+    QSet<QString> watched;
+    QFileSystemWatcher watcher;
+};
+
+class CenteredEditingDelegate : public QStyledItemDelegate
+{
+public:
+    explicit CenteredEditingDelegate(QObject *parent = 0) : QStyledItemDelegate(parent) {}
+    virtual ~CenteredEditingDelegate() {}
+    virtual QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
+                                  const QModelIndex &index) const
+    {
+        auto widget = QStyledItemDelegate::createEditor(parent, option, index);
+        auto foo = dynamic_cast<QLineEdit *>(widget);
+        if (foo)
+        {
+            foo->setAlignment(Qt::AlignHCenter);
+            foo->setFrame(true);
+            foo->setMaximumWidth(192);
+        }
+        return widget;
+    }
+};
+
+ScreenshotsPage::ScreenshotsPage(QString path, QWidget *parent)
+    : QMainWindow(parent), ui(new Ui::ScreenshotsPage)
+{
+    m_model.reset(new QFileSystemModel());
+    m_filterModel.reset(new FilterModel());
+    m_filterModel->setSourceModel(m_model.get());
+    m_model->setFilter(QDir::Files | QDir::Writable | QDir::Readable);
+    m_model->setReadOnly(false);
+    m_model->setNameFilters({"*.png"});
+    m_model->setNameFilterDisables(false);
+    m_folder = path;
+    m_valid = FS::ensureFolderPathExists(m_folder);
+
+    ui->setupUi(this);
+    ui->toolBar->insertSpacer(ui->actionView_Folder);
+
+    ui->listView->setIconSize(QSize(128, 128));
+    ui->listView->setGridSize(QSize(192, 160));
+    ui->listView->setSpacing(9);
+    // ui->listView->setUniformItemSizes(true);
+    ui->listView->setLayoutMode(QListView::Batched);
+    ui->listView->setViewMode(QListView::IconMode);
+    ui->listView->setResizeMode(QListView::Adjust);
+    ui->listView->installEventFilter(this);
+    ui->listView->setEditTriggers(0);
+    ui->listView->setItemDelegate(new CenteredEditingDelegate(this));
+    ui->listView->setContextMenuPolicy(Qt::CustomContextMenu);
+    connect(ui->listView, &QListView::customContextMenuRequested, this, &ScreenshotsPage::ShowContextMenu);
+    connect(ui->listView, SIGNAL(activated(QModelIndex)), SLOT(onItemActivated(QModelIndex)));
+}
+
+bool ScreenshotsPage::eventFilter(QObject *obj, QEvent *evt)
+{
+    if (obj != ui->listView)
+        return QWidget::eventFilter(obj, evt);
+    if (evt->type() != QEvent::KeyPress)
+    {
+        return QWidget::eventFilter(obj, evt);
+    }
+    QKeyEvent *keyEvent = static_cast<QKeyEvent *>(evt);
+    switch (keyEvent->key())
+    {
+    case Qt::Key_Delete:
+        on_actionDelete_triggered();
+        return true;
+    case Qt::Key_F2:
+        on_actionRename_triggered();
+        return true;
+    default:
+        break;
+    }
+    return QWidget::eventFilter(obj, evt);
+}
+
+ScreenshotsPage::~ScreenshotsPage()
+{
+    delete ui;
+}
+
+void ScreenshotsPage::ShowContextMenu(const QPoint& pos)
+{
+    auto menu = ui->toolBar->createContextMenu(this, tr("Context menu"));
+    menu->exec(ui->listView->mapToGlobal(pos));
+    delete menu;
+}
+
+QMenu * ScreenshotsPage::createPopupMenu()
+{
+    QMenu* filteredMenu = QMainWindow::createPopupMenu();
+    filteredMenu->removeAction( ui->toolBar->toggleViewAction() );
+    return filteredMenu;
+}
+
+void ScreenshotsPage::onItemActivated(QModelIndex index)
+{
+    if (!index.isValid())
+        return;
+    auto info = m_model->fileInfo(index);
+    QString fileName = info.absoluteFilePath();
+    DesktopServices::openFile(info.absoluteFilePath());
+}
+
+void ScreenshotsPage::on_actionView_Folder_triggered()
+{
+    DesktopServices::openDirectory(m_folder, true);
+}
+
+void ScreenshotsPage::on_actionUpload_triggered()
+{
+    auto selection = ui->listView->selectionModel()->selectedRows();
+    if (selection.isEmpty())
+        return;
+
+    QList<ScreenShot::Ptr> uploaded;
+    auto job = NetJob::Ptr(new NetJob("Screenshot Upload"));
+    if(selection.size() < 2)
+    {
+        auto item = selection.at(0);
+        auto info = m_model->fileInfo(item);
+        auto screenshot = std::make_shared<ScreenShot>(info);
+        job->addNetAction(ImgurUpload::make(screenshot));
+
+        m_uploadActive = true;
+        ProgressDialog dialog(this);
+        if(dialog.execWithTask(job.get()) != QDialog::Accepted)
+        {
+            CustomMessageBox::selectable(this, tr("Failed to upload screenshots!"),
+                                         tr("Unknown error"), QMessageBox::Warning)->exec();
+        }
+        else
+        {
+            auto link = screenshot->m_url;
+            QClipboard *clipboard = QApplication::clipboard();
+            clipboard->setText(link);
+            CustomMessageBox::selectable(
+                    this,
+                    tr("Upload finished"),
+                    tr("The <a href=\"%1\">link  to the uploaded screenshot</a> has been placed in your clipboard.")
+                        .arg(link),
+                    QMessageBox::Information
+            )->exec();
+        }
+
+        m_uploadActive = false;
+        return;
+    }
+
+    for (auto item : selection)
+    {
+        auto info = m_model->fileInfo(item);
+        auto screenshot = std::make_shared<ScreenShot>(info);
+        uploaded.push_back(screenshot);
+        job->addNetAction(ImgurUpload::make(screenshot));
+    }
+    SequentialTask task;
+    auto albumTask = NetJob::Ptr(new NetJob("Imgur Album Creation"));
+    auto imgurAlbum = ImgurAlbumCreation::make(uploaded);
+    albumTask->addNetAction(imgurAlbum);
+    task.addTask(job);
+    task.addTask(albumTask);
+    m_uploadActive = true;
+    ProgressDialog prog(this);
+    if (prog.execWithTask(&task) != QDialog::Accepted)
+    {
+        CustomMessageBox::selectable(this, tr("Failed to upload screenshots!"),
+                                     tr("Unknown error"), QMessageBox::Warning)->exec();
+    }
+    else
+    {
+        auto link = QString("https://imgur.com/a/%1").arg(imgurAlbum->id());
+        QClipboard *clipboard = QApplication::clipboard();
+        clipboard->setText(link);
+        CustomMessageBox::selectable(
+            this,
+            tr("Upload finished"),
+            tr("The <a href=\"%1\">link  to the uploaded album</a> has been placed in your clipboard.") .arg(link),
+            QMessageBox::Information
+        )->exec();
+    }
+    m_uploadActive = false;
+}
+
+void ScreenshotsPage::on_actionDelete_triggered()
+{
+    auto mbox = CustomMessageBox::selectable(
+        this, tr("Are you sure?"), tr("This will delete all selected screenshots."),
+        QMessageBox::Warning, QMessageBox::Yes | QMessageBox::No);
+    std::unique_ptr<QMessageBox> box(mbox);
+
+    if (box->exec() != QMessageBox::Yes)
+        return;
+
+    auto selected = ui->listView->selectionModel()->selectedIndexes();
+    for (auto item : selected)
+    {
+        m_model->remove(item);
+    }
+}
+
+void ScreenshotsPage::on_actionRename_triggered()
+{
+    auto selection = ui->listView->selectionModel()->selectedIndexes();
+    if (selection.isEmpty())
+        return;
+    ui->listView->edit(selection[0]);
+    // TODO: mass renaming
+}
+
+void ScreenshotsPage::openedImpl()
+{
+    if(!m_valid)
+    {
+        m_valid = FS::ensureFolderPathExists(m_folder);
+    }
+    if (m_valid)
+    {
+        QString path = QDir(m_folder).absolutePath();
+        auto idx = m_model->setRootPath(path);
+        if(idx.isValid())
+        {
+            ui->listView->setModel(m_filterModel.get());
+            ui->listView->setRootIndex(m_filterModel->mapFromSource(idx));
+        }
+        else
+        {
+            ui->listView->setModel(nullptr);
+        }
+    }
+}
+
+#include "ScreenshotsPage.moc"

launcher/ui/pages/instance/ScreenshotsPage.h

@@ -0,0 +1,89 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QMainWindow>
+
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+
+class QFileSystemModel;
+class QIdentityProxyModel;
+namespace Ui
+{
+class ScreenshotsPage;
+}
+
+struct ScreenShot;
+class ScreenshotList;
+class ImgurAlbumCreation;
+
+class ScreenshotsPage : public QMainWindow, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit ScreenshotsPage(QString path, QWidget *parent = 0);
+    virtual ~ScreenshotsPage();
+
+    virtual void openedImpl() override;
+
+    enum
+    {
+        NothingDone = 0x42
+    };
+
+    virtual bool eventFilter(QObject *, QEvent *) override;
+    virtual QString displayName() const override
+    {
+        return tr("Screenshots");
+    }
+    virtual QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("screenshots");
+    }
+    virtual QString id() const override
+    {
+        return "screenshots";
+    }
+    virtual QString helpPage() const override
+    {
+        return "Screenshots-management";
+    }
+    virtual bool apply() override
+    {
+        return !m_uploadActive;
+    }
+
+protected:
+    QMenu * createPopupMenu() override;
+
+private slots:
+    void on_actionUpload_triggered();
+    void on_actionDelete_triggered();
+    void on_actionRename_triggered();
+    void on_actionView_Folder_triggered();
+    void onItemActivated(QModelIndex);
+    void ShowContextMenu(const QPoint &pos);
+
+private:
+    Ui::ScreenshotsPage *ui;
+    std::shared_ptr<QFileSystemModel> m_model;
+    std::shared_ptr<QIdentityProxyModel> m_filterModel;
+    QString m_folder;
+    bool m_valid = false;
+    bool m_uploadActive = false;
+};

launcher/ui/pages/instance/ScreenshotsPage.ui

@@ -0,0 +1,87 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>ScreenshotsPage</class>
+ <widget class="QMainWindow" name="ScreenshotsPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>800</width>
+    <height>600</height>
+   </rect>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QHBoxLayout" name="horizontalLayout">
+    <property name="leftMargin">
+     <number>0</number>
+    </property>
+    <property name="topMargin">
+     <number>0</number>
+    </property>
+    <property name="rightMargin">
+     <number>0</number>
+    </property>
+    <property name="bottomMargin">
+     <number>0</number>
+    </property>
+    <item>
+     <widget class="QListView" name="listView">
+      <property name="selectionMode">
+       <enum>QAbstractItemView::ExtendedSelection</enum>
+      </property>
+      <property name="selectionBehavior">
+       <enum>QAbstractItemView::SelectRows</enum>
+      </property>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+  <widget class="WideBar" name="toolBar">
+   <property name="windowTitle">
+    <string>Actions</string>
+   </property>
+   <property name="toolButtonStyle">
+    <enum>Qt::ToolButtonTextOnly</enum>
+   </property>
+   <attribute name="toolBarArea">
+    <enum>RightToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+   <addaction name="actionUpload"/>
+   <addaction name="actionDelete"/>
+   <addaction name="actionRename"/>
+   <addaction name="actionView_Folder"/>
+  </widget>
+  <action name="actionUpload">
+   <property name="text">
+    <string>Upload</string>
+   </property>
+  </action>
+  <action name="actionDelete">
+   <property name="text">
+    <string>Delete</string>
+   </property>
+  </action>
+  <action name="actionRename">
+   <property name="text">
+    <string>Rename</string>
+   </property>
+  </action>
+  <action name="actionView_Folder">
+   <property name="text">
+    <string>View Folder</string>
+   </property>
+  </action>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>WideBar</class>
+   <extends>QToolBar</extends>
+   <header>ui/widgets/WideBar.h</header>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/instance/ServersPage.cpp

@@ -0,0 +1,768 @@
+#include "ServersPage.h"
+#include "ui_ServersPage.h"
+
+#include <FileSystem.h>
+#include <sstream>
+#include <io/stream_reader.h>
+#include <tag_string.h>
+#include <tag_primitive.h>
+#include <tag_list.h>
+#include <tag_compound.h>
+#include <minecraft/MinecraftInstance.h>
+
+#include <QFileSystemWatcher>
+#include <QMenu>
+
+static const int COLUMN_COUNT = 2; // 3 , TBD: latency and other nice things.
+
+struct Server
+{
+    // Types
+    enum class AcceptsTextures : int
+    {
+        ASK = 0,
+        ALWAYS = 1,
+        NEVER = 2
+    };
+
+    // Methods
+    Server()
+    {
+        m_name = QObject::tr("Minecraft Server");
+    }
+    Server(const QString & name, const QString & address)
+    {
+        m_name = name;
+        m_address = address;
+    }
+    Server(nbt::tag_compound& server)
+    {
+        std::string addressStr(server["ip"]);
+        m_address = QString::fromUtf8(addressStr.c_str());
+
+        std::string nameStr(server["name"]);
+        m_name = QString::fromUtf8(nameStr.c_str());
+
+        if(server["icon"])
+        {
+            std::string base64str(server["icon"]);
+            m_icon = QByteArray::fromBase64(base64str.c_str());
+        }
+
+        if(server.has_key("acceptTextures", nbt::tag_type::Byte))
+        {
+            bool value = server["acceptTextures"].as<nbt::tag_byte>().get();
+            if(value)
+            {
+                m_acceptsTextures = AcceptsTextures::ALWAYS;
+            }
+            else
+            {
+                m_acceptsTextures = AcceptsTextures::NEVER;
+            }
+        }
+    }
+
+    void serialize(nbt::tag_compound& server)
+    {
+        server.insert("name", m_name.trimmed().toUtf8().toStdString());
+        server.insert("ip", m_address.trimmed().toUtf8().toStdString());
+        if(m_icon.size())
+        {
+            server.insert("icon", m_icon.toBase64().toStdString());
+        }
+        if(m_acceptsTextures != AcceptsTextures::ASK)
+        {
+            server.insert("acceptTextures", nbt::tag_byte(m_acceptsTextures == AcceptsTextures::ALWAYS));
+        }
+    }
+
+    // Data - persistent and user changeable
+    QString m_name;
+    QString m_address;
+    AcceptsTextures m_acceptsTextures = AcceptsTextures::ASK;
+
+    // Data - persistent and automatically updated
+    QByteArray m_icon;
+
+    // Data - temporary
+    bool m_checked = false;
+    bool m_up = false;
+    QString m_motd; // https://mctools.org/motd-creator
+    int m_ping = 0;
+    int m_currentPlayers = 0;
+    int m_maxPlayers = 0;
+};
+
+static std::unique_ptr <nbt::tag_compound> parseServersDat(const QString& filename)
+{
+    try
+    {
+        QByteArray input = FS::read(filename);
+        std::istringstream foo(std::string(input.constData(), input.size()));
+        auto pair = nbt::io::read_compound(foo);
+
+        if(pair.first != "")
+            return nullptr;
+
+        if(pair.second == nullptr)
+            return nullptr;
+
+        return std::move(pair.second);
+    }
+    catch (...)
+    {
+        return nullptr;
+    }
+}
+
+static bool serializeServerDat(const QString& filename, nbt::tag_compound * levelInfo)
+{
+    try
+    {
+        if(!FS::ensureFilePathExists(filename))
+        {
+            return false;
+        }
+        std::ostringstream s;
+        nbt::io::write_tag("", *levelInfo, s);
+        QByteArray val(s.str().data(), (int) s.str().size() );
+        FS::write(filename, val);
+        return true;
+    }
+    catch (...)
+    {
+        return false;
+    }
+}
+
+class ServersModel: public QAbstractListModel
+{
+    Q_OBJECT
+public:
+    enum Roles
+    {
+        ServerPtrRole = Qt::UserRole,
+    };
+    explicit ServersModel(const QString &path, QObject *parent = 0)
+        : QAbstractListModel(parent)
+    {
+        m_path = path;
+        m_watcher = new QFileSystemWatcher(this);
+        connect(m_watcher, &QFileSystemWatcher::fileChanged, this, &ServersModel::fileChanged);
+        connect(m_watcher, &QFileSystemWatcher::directoryChanged, this, &ServersModel::dirChanged);
+        m_saveTimer.setSingleShot(true);
+        m_saveTimer.setInterval(5000);
+        connect(&m_saveTimer, &QTimer::timeout, this, &ServersModel::save_internal);
+    }
+    virtual ~ServersModel() {};
+
+    void observe()
+    {
+        if(m_observed)
+        {
+            return;
+        }
+        m_observed = true;
+
+        if(!m_loaded)
+        {
+            load();
+        }
+
+        updateFSObserver();
+    }
+
+    void unobserve()
+    {
+        if(!m_observed)
+        {
+            return;
+        }
+        m_observed = false;
+
+        updateFSObserver();
+    }
+
+    void lock()
+    {
+        if(m_locked)
+        {
+            return;
+        }
+        saveNow();
+
+        m_locked = true;
+        updateFSObserver();
+    }
+
+    void unlock()
+    {
+        if(!m_locked)
+        {
+            return;
+        }
+        m_locked = false;
+
+        updateFSObserver();
+    }
+
+    int addEmptyRow(int position)
+    {
+        if(m_locked)
+        {
+            return -1;
+        }
+        if(position < 0 || position >= rowCount())
+        {
+            position = rowCount();
+        }
+        beginInsertRows(QModelIndex(), position, position);
+        m_servers.insert(position, Server());
+        endInsertRows();
+        scheduleSave();
+        return position;
+    }
+
+    bool removeRow(int row)
+    {
+        if(m_locked)
+        {
+            return false;
+        }
+        if(row < 0 || row >= rowCount())
+        {
+            return false;
+        }
+        beginRemoveRows(QModelIndex(), row, row);
+        m_servers.removeAt(row);
+        endRemoveRows(); // does absolutely nothing, the selected server stays as the next line...
+        scheduleSave();
+        return true;
+    }
+
+    bool moveUp(int row)
+    {
+        if(m_locked)
+        {
+            return false;
+        }
+        if(row <= 0)
+        {
+            return false;
+        }
+        beginMoveRows(QModelIndex(), row, row, QModelIndex(), row - 1);
+        m_servers.swap(row-1, row);
+        endMoveRows();
+        scheduleSave();
+        return true;
+    }
+
+    bool moveDown(int row)
+    {
+        if(m_locked)
+        {
+            return false;
+        }
+        int count = rowCount();
+        if(row + 1 >= count)
+        {
+            return false;
+        }
+        beginMoveRows(QModelIndex(), row, row, QModelIndex(), row + 2);
+        m_servers.swap(row+1, row);
+        endMoveRows();
+        scheduleSave();
+        return true;
+    }
+
+    QVariant headerData(int section, Qt::Orientation orientation, int role) const override
+    {
+        if (section < 0 || section >= COLUMN_COUNT)
+            return QVariant();
+
+        if(role == Qt::DisplayRole)
+        {
+            switch(section)
+            {
+                case 0:
+                    return tr("Name");
+                case 1:
+                    return tr("Address");
+                case 2:
+                    return tr("Latency");
+            }
+        }
+
+        return QAbstractListModel::headerData(section, orientation, role);
+    }
+
+    virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override
+    {
+        if (!index.isValid())
+            return QVariant();
+
+        int row = index.row();
+        int column = index.column();
+        if(column < 0 || column >= COLUMN_COUNT)
+            return QVariant();
+
+        if (row < 0 || row >= m_servers.size())
+            return QVariant();
+
+        switch(column)
+        {
+            case 0:
+                switch (role)
+                {
+                case Qt::DecorationRole:
+                {
+                    auto & bytes = m_servers[row].m_icon;
+                    if(bytes.size())
+                    {
+                        QPixmap px;
+                        if(px.loadFromData(bytes))
+                            return QIcon(px);
+                    }
+                    return APPLICATION->getThemedIcon("unknown_server");
+                }
+                case Qt::DisplayRole:
+                    return m_servers[row].m_name;
+                case ServerPtrRole:
+                    return QVariant::fromValue<void *>((void *)&m_servers[row]);
+                default:
+                    return QVariant();
+                }
+            case 1:
+                switch (role)
+                {
+                case Qt::DisplayRole:
+                    return m_servers[row].m_address;
+                default:
+                    return QVariant();
+                }
+            case 2:
+                switch (role)
+                {
+                case Qt::DisplayRole:
+                    return m_servers[row].m_ping;
+                default:
+                    return QVariant();
+                }
+            default:
+                return QVariant();
+        }
+    }
+
+    virtual int rowCount(const QModelIndex &parent = QModelIndex()) const override
+    {
+        return m_servers.size();
+    }
+    int columnCount(const QModelIndex & parent) const override
+    {
+        return COLUMN_COUNT;
+    }
+
+    Server * at(int index)
+    {
+        if(index < 0 || index >= rowCount())
+        {
+            return nullptr;
+        }
+        return &m_servers[index];
+    }
+
+    void setName(int row, const QString & name)
+    {
+        if(m_locked)
+        {
+            return;
+        }
+        auto server = at(row);
+        if(!server || server->m_name == name)
+        {
+            return;
+        }
+        server->m_name = name;
+        emit dataChanged(index(row, 0), index(row, COLUMN_COUNT - 1));
+        scheduleSave();
+    }
+
+    void setAddress(int row, const QString & address)
+    {
+        if(m_locked)
+        {
+            return;
+        }
+        auto server = at(row);
+        if(!server || server->m_address == address)
+        {
+            return;
+        }
+        server->m_address = address;
+        emit dataChanged(index(row, 0), index(row, COLUMN_COUNT - 1));
+        scheduleSave();
+    }
+
+    void setAcceptsTextures(int row, Server::AcceptsTextures textures)
+    {
+        if(m_locked)
+        {
+            return;
+        }
+        auto server = at(row);
+        if(!server || server->m_acceptsTextures == textures)
+        {
+            return;
+        }
+        server->m_acceptsTextures = textures;
+        emit dataChanged(index(row, 0), index(row, COLUMN_COUNT - 1));
+        scheduleSave();
+    }
+
+    void load()
+    {
+        cancelSave();
+        beginResetModel();
+        QList<Server> servers;
+        auto serversDat = parseServersDat(serversPath());
+        if(serversDat)
+        {
+            auto &serversList = serversDat->at("servers").as<nbt::tag_list>();
+            for(auto iter = serversList.begin(); iter != serversList.end(); iter++)
+            {
+                auto & serverTag = (*iter).as<nbt::tag_compound>();
+                Server s(serverTag);
+                servers.append(s);
+            }
+        }
+        m_servers.swap(servers);
+        m_loaded = true;
+        endResetModel();
+    }
+
+    void saveNow()
+    {
+        if(saveIsScheduled())
+        {
+            save_internal();
+        }
+    }
+
+
+public slots:
+    void dirChanged(const QString& path)
+    {
+        qDebug() << "Changed:" << path;
+        load();
+    }
+    void fileChanged(const QString& path)
+    {
+        qDebug() << "Changed:" << path;
+    }
+
+private slots:
+    void save_internal()
+    {
+        cancelSave();
+        QString path = serversPath();
+        qDebug() << "Server list about to be saved to" << path;
+
+        nbt::tag_compound out;
+        nbt::tag_list list;
+        for(auto & server: m_servers)
+        {
+            nbt::tag_compound serverNbt;
+            server.serialize(serverNbt);
+            list.push_back(std::move(serverNbt));
+        }
+        out.insert("servers", nbt::value(std::move(list)));
+
+        if(!serializeServerDat(path, &out))
+        {
+            qDebug() << "Failed to save server list:" << path << "Will try again.";
+            scheduleSave();
+        }
+    }
+
+private:
+    void scheduleSave()
+    {
+        if(!m_loaded)
+        {
+            qDebug() << "Server list should never save if it didn't successfully load, path:" << m_path;
+            return;
+        }
+        if(!m_dirty)
+        {
+            m_dirty = true;
+            qDebug() << "Server list save is scheduled for" << m_path;
+        }
+        m_saveTimer.start();
+    }
+
+    void cancelSave()
+    {
+        m_dirty = false;
+        m_saveTimer.stop();
+    }
+
+    bool saveIsScheduled() const
+    {
+        return m_dirty;
+    }
+
+    void updateFSObserver()
+    {
+        bool observingFS = m_watcher->directories().contains(m_path);
+        if(m_observed && m_locked)
+        {
+            if(!observingFS)
+            {
+                qWarning() << "Will watch" << m_path;
+                if(!m_watcher->addPath(m_path))
+                {
+                    qWarning() << "Failed to start watching" << m_path;
+                }
+            }
+        }
+        else
+        {
+            if(observingFS)
+            {
+                qWarning() << "Will stop watching" << m_path;
+                if(!m_watcher->removePath(m_path))
+                {
+                    qWarning() << "Failed to stop watching" << m_path;
+                }
+            }
+        }
+    }
+
+    QString serversPath()
+    {
+        QFileInfo foo(FS::PathCombine(m_path, "servers.dat"));
+        return foo.filePath();
+    }
+
+private:
+    bool m_loaded = false;
+    bool m_locked = false;
+    bool m_observed = false;
+    bool m_dirty = false;
+    QString m_path;
+    QList<Server> m_servers;
+    QFileSystemWatcher *m_watcher = nullptr;
+    QTimer m_saveTimer;
+};
+
+ServersPage::ServersPage(InstancePtr inst, QWidget* parent)
+    : QMainWindow(parent), ui(new Ui::ServersPage)
+{
+    ui->setupUi(this);
+    m_inst = inst;
+    m_model = new ServersModel(inst->gameRoot(), this);
+    ui->serversView->setIconSize(QSize(64,64));
+    ui->serversView->setModel(m_model);
+    ui->serversView->setContextMenuPolicy(Qt::CustomContextMenu);
+    connect(ui->serversView, &QTreeView::customContextMenuRequested, this, &ServersPage::ShowContextMenu);
+
+    auto head = ui->serversView->header();
+    if(head->count())
+    {
+        head->setSectionResizeMode(0, QHeaderView::Stretch);
+        for(int i = 1; i < head->count(); i++)
+        {
+            head->setSectionResizeMode(i, QHeaderView::ResizeToContents);
+        }
+    }
+
+    auto selectionModel = ui->serversView->selectionModel();
+    connect(selectionModel, &QItemSelectionModel::currentChanged, this, &ServersPage::currentChanged);
+    connect(m_inst.get(), &MinecraftInstance::runningStatusChanged, this, &ServersPage::on_RunningState_changed);
+    connect(ui->nameLine, &QLineEdit::textEdited, this, &ServersPage::nameEdited);
+    connect(ui->addressLine, &QLineEdit::textEdited, this, &ServersPage::addressEdited);
+    connect(ui->resourceComboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(resourceIndexChanged(int)));
+    connect(m_model, &QAbstractItemModel::rowsRemoved, this, &ServersPage::rowsRemoved);
+
+    m_locked = m_inst->isRunning();
+    if(m_locked)
+    {
+        m_model->lock();
+    }
+
+    updateState();
+}
+
+ServersPage::~ServersPage()
+{
+    m_model->saveNow();
+    delete ui;
+}
+
+void ServersPage::ShowContextMenu(const QPoint& pos)
+{
+    auto menu = ui->toolBar->createContextMenu(this, tr("Context menu"));
+    menu->exec(ui->serversView->mapToGlobal(pos));
+    delete menu;
+}
+
+QMenu * ServersPage::createPopupMenu()
+{
+    QMenu* filteredMenu = QMainWindow::createPopupMenu();
+    filteredMenu->removeAction( ui->toolBar->toggleViewAction() );
+    return filteredMenu;
+}
+
+void ServersPage::on_RunningState_changed(bool running)
+{
+    if(m_locked == running)
+    {
+        return;
+    }
+    m_locked = running;
+    if(m_locked)
+    {
+        m_model->lock();
+    }
+    else
+    {
+        m_model->unlock();
+    }
+    updateState();
+}
+
+void ServersPage::currentChanged(const QModelIndex &current, const QModelIndex &previous)
+{
+    int nextServer = -1;
+    if (!current.isValid())
+    {
+        nextServer = -1;
+    }
+    else
+    {
+        nextServer = current.row();
+    }
+    currentServer = nextServer;
+    updateState();
+}
+
+// WARNING: this is here because currentChanged is not accurate when removing rows. the current item needs to be fixed up after removal.
+void ServersPage::rowsRemoved(const QModelIndex& parent, int first, int last)
+{
+    if(currentServer < first)
+    {
+        // current was before the removal
+        return;
+    }
+    else if(currentServer >= first && currentServer <= last)
+    {
+        // current got removed...
+        return;
+    }
+    else
+    {
+        // current was past the removal
+        int count = last - first + 1;
+        currentServer -= count;
+    }
+}
+
+void ServersPage::nameEdited(const QString& name)
+{
+    m_model->setName(currentServer, name);
+}
+
+void ServersPage::addressEdited(const QString& address)
+{
+    m_model->setAddress(currentServer, address);
+}
+
+void ServersPage::resourceIndexChanged(int index)
+{
+    auto acceptsTextures = Server::AcceptsTextures(index);
+    m_model->setAcceptsTextures(currentServer, acceptsTextures);
+}
+
+void ServersPage::updateState()
+{
+    auto server = m_model->at(currentServer);
+
+    bool serverEditEnabled = server && !m_locked;
+    ui->addressLine->setEnabled(serverEditEnabled);
+    ui->nameLine->setEnabled(serverEditEnabled);
+    ui->resourceComboBox->setEnabled(serverEditEnabled);
+    ui->actionMove_Down->setEnabled(serverEditEnabled);
+    ui->actionMove_Up->setEnabled(serverEditEnabled);
+    ui->actionRemove->setEnabled(serverEditEnabled);
+    ui->actionJoin->setEnabled(serverEditEnabled);
+
+    if(server)
+    {
+        ui->addressLine->setText(server->m_address);
+        ui->nameLine->setText(server->m_name);
+        ui->resourceComboBox->setCurrentIndex(int(server->m_acceptsTextures));
+    }
+    else
+    {
+        ui->addressLine->setText(QString());
+        ui->nameLine->setText(QString());
+        ui->resourceComboBox->setCurrentIndex(0);
+    }
+
+    ui->actionAdd->setDisabled(m_locked);
+}
+
+void ServersPage::openedImpl()
+{
+    m_model->observe();
+}
+
+void ServersPage::closedImpl()
+{
+    m_model->unobserve();
+}
+
+void ServersPage::on_actionAdd_triggered()
+{
+    int position = m_model->addEmptyRow(currentServer + 1);
+    if(position < 0)
+    {
+        return;
+    }
+    // select the new row
+    ui->serversView->selectionModel()->setCurrentIndex(
+        m_model->index(position),
+        QItemSelectionModel::SelectCurrent | QItemSelectionModel::Clear | QItemSelectionModel::Rows
+    );
+    currentServer = position;
+}
+
+void ServersPage::on_actionRemove_triggered()
+{
+    m_model->removeRow(currentServer);
+}
+
+void ServersPage::on_actionMove_Up_triggered()
+{
+    if(m_model->moveUp(currentServer))
+    {
+        currentServer --;
+    }
+}
+
+void ServersPage::on_actionMove_Down_triggered()
+{
+    if(m_model->moveDown(currentServer))
+    {
+        currentServer ++;
+    }
+}
+
+void ServersPage::on_actionJoin_triggered()
+{
+    const auto &address = m_model->at(currentServer)->m_address;
+    APPLICATION->launch(m_inst, true, nullptr, std::make_shared<MinecraftServerTarget>(MinecraftServerTarget::parse(address)));
+}
+
+#include "ServersPage.moc"

launcher/ui/pages/instance/ServersPage.h

@@ -0,0 +1,94 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QMainWindow>
+#include <QString>
+
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+
+namespace Ui
+{
+class ServersPage;
+}
+
+struct Server;
+class ServersModel;
+class MinecraftInstance;
+
+class ServersPage : public QMainWindow, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit ServersPage(InstancePtr inst, QWidget *parent = 0);
+    virtual ~ServersPage();
+
+    void openedImpl() override;
+    void closedImpl() override;
+
+    virtual QString displayName() const override
+    {
+        return tr("Servers");
+    }
+    virtual QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("unknown_server");
+    }
+    virtual QString id() const override
+    {
+        return "servers";
+    }
+    virtual QString helpPage() const override
+    {
+        return "Servers-management";
+    }
+
+protected:
+    QMenu * createPopupMenu() override;
+
+private:
+    void updateState();
+    void scheduleSave();
+    bool saveIsScheduled() const;
+
+private slots:
+    void currentChanged(const QModelIndex &current, const QModelIndex &previous);
+    void rowsRemoved(const QModelIndex &parent, int first, int last);
+
+    void on_actionAdd_triggered();
+    void on_actionRemove_triggered();
+    void on_actionMove_Up_triggered();
+    void on_actionMove_Down_triggered();
+    void on_actionJoin_triggered();
+
+    void on_RunningState_changed(bool running);
+
+    void nameEdited(const QString & name);
+    void addressEdited(const QString & address);
+    void resourceIndexChanged(int index);\
+
+    void ShowContextMenu(const QPoint &pos);
+
+private: // data
+    int currentServer = -1;
+    bool m_locked = true;
+    Ui::ServersPage *ui = nullptr;
+    ServersModel * m_model = nullptr;
+    InstancePtr m_inst = nullptr;
+};
+

launcher/ui/pages/instance/ServersPage.ui

@@ -0,0 +1,194 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>ServersPage</class>
+ <widget class="QMainWindow" name="ServersPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>1318</width>
+    <height>879</height>
+   </rect>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QVBoxLayout" name="verticalLayout">
+    <property name="leftMargin">
+     <number>0</number>
+    </property>
+    <property name="topMargin">
+     <number>0</number>
+    </property>
+    <property name="rightMargin">
+     <number>0</number>
+    </property>
+    <property name="bottomMargin">
+     <number>0</number>
+    </property>
+    <item>
+     <widget class="QTreeView" name="serversView">
+      <property name="sizePolicy">
+       <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+        <horstretch>0</horstretch>
+        <verstretch>0</verstretch>
+       </sizepolicy>
+      </property>
+      <property name="acceptDrops">
+       <bool>true</bool>
+      </property>
+      <property name="alternatingRowColors">
+       <bool>true</bool>
+      </property>
+      <property name="selectionMode">
+       <enum>QAbstractItemView::SingleSelection</enum>
+      </property>
+      <property name="selectionBehavior">
+       <enum>QAbstractItemView::SelectRows</enum>
+      </property>
+      <property name="iconSize">
+       <size>
+        <width>64</width>
+        <height>64</height>
+       </size>
+      </property>
+      <property name="rootIsDecorated">
+       <bool>false</bool>
+      </property>
+      <attribute name="headerStretchLastSection">
+       <bool>false</bool>
+      </attribute>
+     </widget>
+    </item>
+    <item>
+     <layout class="QGridLayout" name="gridLayout_2">
+      <property name="leftMargin">
+       <number>6</number>
+      </property>
+      <property name="rightMargin">
+       <number>6</number>
+      </property>
+      <item row="0" column="0">
+       <widget class="QLabel" name="nameLabel">
+        <property name="text">
+         <string>&amp;Name</string>
+        </property>
+        <property name="buddy">
+         <cstring>nameLine</cstring>
+        </property>
+       </widget>
+      </item>
+      <item row="0" column="1">
+       <widget class="QLineEdit" name="nameLine"/>
+      </item>
+      <item row="1" column="0">
+       <widget class="QLabel" name="addressLabel">
+        <property name="text">
+         <string>Address</string>
+        </property>
+        <property name="buddy">
+         <cstring>addressLine</cstring>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="1">
+       <widget class="QLineEdit" name="addressLine"/>
+      </item>
+      <item row="2" column="0">
+       <widget class="QLabel" name="resourcesLabel">
+        <property name="text">
+         <string>Reso&amp;urces</string>
+        </property>
+        <property name="buddy">
+         <cstring>resourceComboBox</cstring>
+        </property>
+       </widget>
+      </item>
+      <item row="2" column="1">
+       <widget class="QComboBox" name="resourceComboBox">
+        <item>
+         <property name="text">
+          <string>Ask to download</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>Always download</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>Never download</string>
+         </property>
+        </item>
+       </widget>
+      </item>
+     </layout>
+    </item>
+   </layout>
+  </widget>
+  <widget class="WideBar" name="toolBar">
+   <property name="windowTitle">
+    <string>Actions</string>
+   </property>
+   <property name="allowedAreas">
+    <set>Qt::LeftToolBarArea|Qt::RightToolBarArea</set>
+   </property>
+   <property name="toolButtonStyle">
+    <enum>Qt::ToolButtonTextOnly</enum>
+   </property>
+   <property name="floatable">
+    <bool>false</bool>
+   </property>
+   <attribute name="toolBarArea">
+    <enum>RightToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+   <addaction name="actionAdd"/>
+   <addaction name="actionRemove"/>
+   <addaction name="actionMove_Up"/>
+   <addaction name="actionMove_Down"/>
+   <addaction name="actionJoin"/>
+  </widget>
+  <action name="actionAdd">
+   <property name="text">
+    <string>Add</string>
+   </property>
+  </action>
+  <action name="actionRemove">
+   <property name="text">
+    <string>Remove</string>
+   </property>
+  </action>
+  <action name="actionMove_Up">
+   <property name="text">
+    <string>Move Up</string>
+   </property>
+  </action>
+  <action name="actionMove_Down">
+   <property name="text">
+    <string>Move Down</string>
+   </property>
+  </action>
+  <action name="actionJoin">
+   <property name="text">
+    <string>Join</string>
+   </property>
+  </action>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>WideBar</class>
+   <extends>QToolBar</extends>
+   <header>ui/widgets/WideBar.h</header>
+  </customwidget>
+ </customwidgets>
+ <tabstops>
+  <tabstop>serversView</tabstop>
+  <tabstop>nameLine</tabstop>
+  <tabstop>addressLine</tabstop>
+  <tabstop>resourceComboBox</tabstop>
+ </tabstops>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/instance/ShaderPackPage.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "ModFolderPage.h"
+#include "ui_ModFolderPage.h"
+
+class ShaderPackPage : public ModFolderPage
+{
+    Q_OBJECT
+public:
+    explicit ShaderPackPage(MinecraftInstance *instance, QWidget *parent = 0)
+        : ModFolderPage(instance, instance->shaderPackList(), "shaderpacks",
+                        "shaderpacks", tr("Shader packs"), "Resource-packs", parent)
+    {
+        ui->actionView_configs->setVisible(false);
+    }
+    virtual ~ShaderPackPage() {}
+
+    virtual bool shouldDisplay() const override
+    {
+        return true;
+    }
+};

launcher/ui/pages/instance/TexturePackPage.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "ModFolderPage.h"
+#include "ui_ModFolderPage.h"
+
+class TexturePackPage : public ModFolderPage
+{
+    Q_OBJECT
+public:
+    explicit TexturePackPage(MinecraftInstance *instance, QWidget *parent = 0)
+        : ModFolderPage(instance, instance->texturePackList(), "texturepacks", "resourcepacks",
+                        tr("Texture packs"), "Texture-packs", parent)
+    {
+        ui->actionView_configs->setVisible(false);
+    }
+    virtual ~TexturePackPage() {}
+
+    virtual bool shouldDisplay() const override
+    {
+        return m_inst->traits().contains("texturepacks");
+    }
+};

launcher/ui/pages/instance/VersionPage.cpp

@@ -0,0 +1,641 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Application.h"
+
+#include <QMessageBox>
+#include <QLabel>
+#include <QEvent>
+#include <QKeyEvent>
+#include <QMenu>
+#include <QAbstractItemModel>
+#include <QMessageBox>
+#include <QListView>
+#include <QString>
+#include <QUrl>
+
+#include "VersionPage.h"
+#include "ui_VersionPage.h"
+
+#include "ui/dialogs/CustomMessageBox.h"
+#include "ui/dialogs/VersionSelectDialog.h"
+#include "ui/dialogs/NewComponentDialog.h"
+#include "ui/dialogs/ProgressDialog.h"
+
+#include "ui/GuiUtil.h"
+
+#include "minecraft/PackProfile.h"
+#include "minecraft/auth/AccountList.h"
+#include "minecraft/mod/Mod.h"
+#include "icons/IconList.h"
+#include "Exception.h"
+#include "Version.h"
+#include "DesktopServices.h"
+
+#include "meta/Index.h"
+#include "meta/VersionList.h"
+
+class IconProxy : public QIdentityProxyModel
+{
+    Q_OBJECT
+public:
+
+    IconProxy(QWidget *parentWidget) : QIdentityProxyModel(parentWidget)
+    {
+        connect(parentWidget, &QObject::destroyed, this, &IconProxy::widgetGone);
+        m_parentWidget = parentWidget;
+    }
+
+    virtual QVariant data(const QModelIndex &proxyIndex, int role = Qt::DisplayRole) const override
+    {
+        QVariant var = QIdentityProxyModel::data(proxyIndex, role);
+        int column = proxyIndex.column();
+        if(column == 0 && role == Qt::DecorationRole && m_parentWidget)
+        {
+            if(!var.isNull())
+            {
+                auto string = var.toString();
+                if(string == "warning")
+                {
+                    return APPLICATION->getThemedIcon("status-yellow");
+                }
+                else if(string == "error")
+                {
+                    return APPLICATION->getThemedIcon("status-bad");
+                }
+            }
+            return APPLICATION->getThemedIcon("status-good");
+        }
+        return var;
+    }
+private slots:
+    void widgetGone()
+    {
+        m_parentWidget = nullptr;
+    }
+
+private:
+    QWidget *m_parentWidget = nullptr;
+};
+
+QIcon VersionPage::icon() const
+{
+    return APPLICATION->icons()->getIcon(m_inst->iconKey());
+}
+bool VersionPage::shouldDisplay() const
+{
+    return true;
+}
+
+QMenu * VersionPage::createPopupMenu()
+{
+    QMenu* filteredMenu = QMainWindow::createPopupMenu();
+    filteredMenu->removeAction( ui->toolBar->toggleViewAction() );
+    return filteredMenu;
+}
+
+VersionPage::VersionPage(MinecraftInstance *inst, QWidget *parent)
+    : QMainWindow(parent), ui(new Ui::VersionPage), m_inst(inst)
+{
+    ui->setupUi(this);
+
+    ui->toolBar->insertSpacer(ui->actionReload);
+
+    m_profile = m_inst->getPackProfile();
+
+    reloadPackProfile();
+
+    auto proxy = new IconProxy(ui->packageView);
+    proxy->setSourceModel(m_profile.get());
+
+    m_filterModel = new QSortFilterProxyModel();
+    m_filterModel->setDynamicSortFilter(true);
+    m_filterModel->setFilterCaseSensitivity(Qt::CaseInsensitive);
+    m_filterModel->setSortCaseSensitivity(Qt::CaseInsensitive);
+    m_filterModel->setSourceModel(proxy);
+    m_filterModel->setFilterKeyColumn(-1);
+
+    ui->packageView->setModel(m_filterModel);
+    ui->packageView->installEventFilter(this);
+    ui->packageView->setSelectionMode(QAbstractItemView::SingleSelection);
+    ui->packageView->setContextMenuPolicy(Qt::CustomContextMenu);
+
+    connect(ui->packageView->selectionModel(), &QItemSelectionModel::currentChanged, this, &VersionPage::versionCurrent);
+    auto smodel = ui->packageView->selectionModel();
+    connect(smodel, &QItemSelectionModel::currentChanged, this, &VersionPage::packageCurrent);
+
+    connect(m_profile.get(), &PackProfile::minecraftChanged, this, &VersionPage::updateVersionControls);
+    controlsEnabled = !m_inst->isRunning();
+    updateVersionControls();
+    preselect(0);
+    connect(m_inst, &BaseInstance::runningStatusChanged, this, &VersionPage::updateRunningStatus);
+    connect(ui->packageView, &ModListView::customContextMenuRequested, this, &VersionPage::showContextMenu);
+    connect(ui->filterEdit, &QLineEdit::textChanged, this, &VersionPage::onFilterTextChanged);
+}
+
+VersionPage::~VersionPage()
+{
+    delete ui;
+}
+
+void VersionPage::showContextMenu(const QPoint& pos)
+{
+    auto menu = ui->toolBar->createContextMenu(this, tr("Context menu"));
+    menu->exec(ui->packageView->mapToGlobal(pos));
+    delete menu;
+}
+
+void VersionPage::packageCurrent(const QModelIndex &current, const QModelIndex &previous)
+{
+    if (!current.isValid())
+    {
+        ui->frame->clear();
+        return;
+    }
+    int row = current.row();
+    auto patch = m_profile->getComponent(row);
+    auto severity = patch->getProblemSeverity();
+    switch(severity)
+    {
+        case ProblemSeverity::Warning:
+            ui->frame->setModText(tr("%1 possibly has issues.").arg(patch->getName()));
+            break;
+        case ProblemSeverity::Error:
+            ui->frame->setModText(tr("%1 has issues!").arg(patch->getName()));
+            break;
+        default:
+        case ProblemSeverity::None:
+            ui->frame->clear();
+            return;
+    }
+
+    auto &problems = patch->getProblems();
+    QString problemOut;
+    for (auto &problem: problems)
+    {
+        if(problem.m_severity == ProblemSeverity::Error)
+        {
+            problemOut += tr("Error: ");
+        }
+        else if(problem.m_severity == ProblemSeverity::Warning)
+        {
+            problemOut += tr("Warning: ");
+        }
+        problemOut += problem.m_description;
+        problemOut += "\n";
+    }
+    ui->frame->setModDescription(problemOut);
+}
+
+void VersionPage::updateRunningStatus(bool running)
+{
+    if(controlsEnabled == running) {
+        controlsEnabled = !running;
+        updateVersionControls();
+    }
+}
+
+void VersionPage::updateVersionControls()
+{
+    // FIXME: this is a dirty hack
+    auto minecraftVersion = Version(m_profile->getComponentVersion("net.minecraft"));
+
+    bool supportsFabric = minecraftVersion >= Version("1.14");
+    ui->actionInstall_Fabric->setEnabled(controlsEnabled && supportsFabric);
+
+    bool supportsForge = minecraftVersion <= Version("1.16.5");
+    ui->actionInstall_Forge->setEnabled(controlsEnabled && supportsForge);
+
+    bool supportsLiteLoader = minecraftVersion <= Version("1.12.2");
+    ui->actionInstall_LiteLoader->setEnabled(controlsEnabled && supportsLiteLoader);
+
+    updateButtons();
+}
+
+void VersionPage::updateButtons(int row)
+{
+    if(row == -1)
+        row = currentRow();
+    auto patch = m_profile->getComponent(row);
+    ui->actionRemove->setEnabled(controlsEnabled && patch && patch->isRemovable());
+    ui->actionMove_down->setEnabled(controlsEnabled && patch && patch->isMoveable());
+    ui->actionMove_up->setEnabled(controlsEnabled && patch && patch->isMoveable());
+    ui->actionChange_version->setEnabled(controlsEnabled && patch && patch->isVersionChangeable());
+    ui->actionEdit->setEnabled(controlsEnabled && patch && patch->isCustom());
+    ui->actionCustomize->setEnabled(controlsEnabled && patch && patch->isCustomizable());
+    ui->actionRevert->setEnabled(controlsEnabled && patch && patch->isRevertible());
+    ui->actionDownload_All->setEnabled(controlsEnabled);
+    ui->actionAdd_Empty->setEnabled(controlsEnabled);
+    ui->actionReload->setEnabled(controlsEnabled);
+    ui->actionInstall_mods->setEnabled(controlsEnabled);
+    ui->actionReplace_Minecraft_jar->setEnabled(controlsEnabled);
+    ui->actionAdd_to_Minecraft_jar->setEnabled(controlsEnabled);
+}
+
+bool VersionPage::reloadPackProfile()
+{
+    try
+    {
+        m_profile->reload(Net::Mode::Online);
+        return true;
+    }
+    catch (const Exception &e)
+    {
+        QMessageBox::critical(this, tr("Error"), e.cause());
+        return false;
+    }
+    catch (...)
+    {
+        QMessageBox::critical(
+            this, tr("Error"),
+            tr("Couldn't load the instance profile."));
+        return false;
+    }
+}
+
+void VersionPage::on_actionReload_triggered()
+{
+    reloadPackProfile();
+    m_container->refreshContainer();
+}
+
+void VersionPage::on_actionRemove_triggered()
+{
+    if (ui->packageView->currentIndex().isValid())
+    {
+        // FIXME: use actual model, not reloading.
+        if (!m_profile->remove(ui->packageView->currentIndex().row()))
+        {
+            QMessageBox::critical(this, tr("Error"), tr("Couldn't remove file"));
+        }
+    }
+    updateButtons();
+    reloadPackProfile();
+    m_container->refreshContainer();
+}
+
+void VersionPage::on_actionInstall_mods_triggered()
+{
+    if(m_container)
+    {
+        m_container->selectPage("mods");
+    }
+}
+
+void VersionPage::on_actionAdd_to_Minecraft_jar_triggered()
+{
+    auto list = GuiUtil::BrowseForFiles("jarmod", tr("Select jar mods"), tr("Minecraft.jar mods (*.zip *.jar)"), APPLICATION->settings()->get("CentralModsDir").toString(), this->parentWidget());
+    if(!list.empty())
+    {
+        m_profile->installJarMods(list);
+    }
+    updateButtons();
+}
+
+void VersionPage::on_actionReplace_Minecraft_jar_triggered()
+{
+    auto jarPath = GuiUtil::BrowseForFile("jar", tr("Select jar"), tr("Minecraft.jar replacement (*.jar)"), APPLICATION->settings()->get("CentralModsDir").toString(), this->parentWidget());
+    if(!jarPath.isEmpty())
+    {
+        m_profile->installCustomJar(jarPath);
+    }
+    updateButtons();
+}
+
+void VersionPage::on_actionMove_up_triggered()
+{
+    try
+    {
+        m_profile->move(currentRow(), PackProfile::MoveUp);
+    }
+    catch (const Exception &e)
+    {
+        QMessageBox::critical(this, tr("Error"), e.cause());
+    }
+    updateButtons();
+}
+
+void VersionPage::on_actionMove_down_triggered()
+{
+    try
+    {
+        m_profile->move(currentRow(), PackProfile::MoveDown);
+    }
+    catch (const Exception &e)
+    {
+        QMessageBox::critical(this, tr("Error"), e.cause());
+    }
+    updateButtons();
+}
+
+void VersionPage::on_actionChange_version_triggered()
+{
+    auto versionRow = currentRow();
+    if(versionRow == -1)
+    {
+        return;
+    }
+    auto patch = m_profile->getComponent(versionRow);
+    auto name = patch->getName();
+    auto list = patch->getVersionList();
+    if(!list)
+    {
+        return;
+    }
+    auto uid = list->uid();
+    // FIXME: this is a horrible HACK. Get version filtering information from the actual metadata...
+    if(uid == "net.minecraftforge")
+    {
+        on_actionInstall_Forge_triggered();
+        return;
+    }
+    else if (uid == "com.mumfrey.liteloader")
+    {
+        on_actionInstall_LiteLoader_triggered();
+        return;
+    }
+    VersionSelectDialog vselect(list.get(), tr("Change %1 version").arg(name), this);
+    if (uid == "net.fabricmc.intermediary")
+    {
+        vselect.setEmptyString(tr("No intermediary mappings versions are currently available."));
+        vselect.setEmptyErrorString(tr("Couldn't load or download the intermediary mappings version lists!"));
+        vselect.setExactFilter(BaseVersionList::ParentVersionRole, m_profile->getComponentVersion("net.minecraft"));
+    }
+    auto currentVersion = patch->getVersion();
+    if(!currentVersion.isEmpty())
+    {
+        vselect.setCurrentVersion(currentVersion);
+    }
+    if (!vselect.exec() || !vselect.selectedVersion())
+        return;
+
+    qDebug() << "Change" << uid << "to" << vselect.selectedVersion()->descriptor();
+    bool important = false;
+    if(uid == "net.minecraft")
+    {
+        important = true;
+    }
+    m_profile->setComponentVersion(uid, vselect.selectedVersion()->descriptor(), important);
+    m_profile->resolve(Net::Mode::Online);
+    m_container->refreshContainer();
+}
+
+void VersionPage::on_actionDownload_All_triggered()
+{
+    if (!APPLICATION->accounts()->anyAccountIsValid())
+    {
+        CustomMessageBox::selectable(
+            this, tr("Error"),
+            tr("MultiMC cannot download Minecraft or update instances unless you have at least "
+               "one account added.\nPlease add your Mojang or Minecraft account."),
+            QMessageBox::Warning)->show();
+        return;
+    }
+
+    auto updateTask = m_inst->createUpdateTask(Net::Mode::Online);
+    if (!updateTask)
+    {
+        return;
+    }
+    ProgressDialog tDialog(this);
+    connect(updateTask.get(), SIGNAL(failed(QString)), SLOT(onGameUpdateError(QString)));
+    // FIXME: unused return value
+    tDialog.execWithTask(updateTask.get());
+    updateButtons();
+    m_container->refreshContainer();
+}
+
+void VersionPage::on_actionInstall_Forge_triggered()
+{
+    auto vlist = APPLICATION->metadataIndex()->get("net.minecraftforge");
+    if(!vlist)
+    {
+        return;
+    }
+    VersionSelectDialog vselect(vlist.get(), tr("Select Forge version"), this);
+    vselect.setExactFilter(BaseVersionList::ParentVersionRole, m_profile->getComponentVersion("net.minecraft"));
+    vselect.setEmptyString(tr("No Forge versions are currently available for Minecraft ") + m_profile->getComponentVersion("net.minecraft"));
+    vselect.setEmptyErrorString(tr("Couldn't load or download the Forge version lists!"));
+
+    auto currentVersion = m_profile->getComponentVersion("net.minecraftforge");
+    if(!currentVersion.isEmpty())
+    {
+        vselect.setCurrentVersion(currentVersion);
+    }
+
+    if (vselect.exec() && vselect.selectedVersion())
+    {
+        auto vsn = vselect.selectedVersion();
+        m_profile->setComponentVersion("net.minecraftforge", vsn->descriptor());
+        m_profile->resolve(Net::Mode::Online);
+        // m_profile->installVersion();
+        preselect(m_profile->rowCount(QModelIndex())-1);
+        m_container->refreshContainer();
+    }
+}
+
+void VersionPage::on_actionInstall_Fabric_triggered()
+{
+    auto vlist = APPLICATION->metadataIndex()->get("net.fabricmc.fabric-loader");
+    if(!vlist)
+    {
+        return;
+    }
+    VersionSelectDialog vselect(vlist.get(), tr("Select Fabric Loader version"), this);
+    vselect.setEmptyString(tr("No Fabric Loader versions are currently available."));
+    vselect.setEmptyErrorString(tr("Couldn't load or download the Fabric Loader version lists!"));
+
+    auto currentVersion = m_profile->getComponentVersion("net.fabricmc.fabric-loader");
+    if(!currentVersion.isEmpty())
+    {
+        vselect.setCurrentVersion(currentVersion);
+    }
+
+    if (vselect.exec() && vselect.selectedVersion())
+    {
+        auto vsn = vselect.selectedVersion();
+        m_profile->setComponentVersion("net.fabricmc.fabric-loader", vsn->descriptor());
+        m_profile->resolve(Net::Mode::Online);
+        preselect(m_profile->rowCount(QModelIndex())-1);
+        m_container->refreshContainer();
+    }
+}
+
+void VersionPage::on_actionAdd_Empty_triggered()
+{
+    NewComponentDialog compdialog(QString(), QString(), this);
+    QStringList blacklist;
+    for(int i = 0; i < m_profile->rowCount(); i++)
+    {
+        auto comp = m_profile->getComponent(i);
+        blacklist.push_back(comp->getID());
+    }
+    compdialog.setBlacklist(blacklist);
+    if (compdialog.exec())
+    {
+        qDebug() << "name:" << compdialog.name();
+        qDebug() << "uid:" << compdialog.uid();
+        m_profile->installEmpty(compdialog.uid(), compdialog.name());
+    }
+}
+
+void VersionPage::on_actionInstall_LiteLoader_triggered()
+{
+    auto vlist = APPLICATION->metadataIndex()->get("com.mumfrey.liteloader");
+    if(!vlist)
+    {
+        return;
+    }
+    VersionSelectDialog vselect(vlist.get(), tr("Select LiteLoader version"), this);
+    vselect.setExactFilter(BaseVersionList::ParentVersionRole, m_profile->getComponentVersion("net.minecraft"));
+    vselect.setEmptyString(tr("No LiteLoader versions are currently available for Minecraft ") + m_profile->getComponentVersion("net.minecraft"));
+    vselect.setEmptyErrorString(tr("Couldn't load or download the LiteLoader version lists!"));
+
+    auto currentVersion = m_profile->getComponentVersion("com.mumfrey.liteloader");
+    if(!currentVersion.isEmpty())
+    {
+        vselect.setCurrentVersion(currentVersion);
+    }
+
+    if (vselect.exec() && vselect.selectedVersion())
+    {
+        auto vsn = vselect.selectedVersion();
+        m_profile->setComponentVersion("com.mumfrey.liteloader", vsn->descriptor());
+        m_profile->resolve(Net::Mode::Online);
+        // m_profile->installVersion(vselect.selectedVersion());
+        preselect(m_profile->rowCount(QModelIndex())-1);
+        m_container->refreshContainer();
+    }
+}
+
+void VersionPage::on_actionLibrariesFolder_triggered()
+{
+    DesktopServices::openDirectory(m_inst->getLocalLibraryPath(), true);
+}
+
+void VersionPage::on_actionMinecraftFolder_triggered()
+{
+    DesktopServices::openDirectory(m_inst->gameRoot(), true);
+}
+
+void VersionPage::versionCurrent(const QModelIndex &current, const QModelIndex &previous)
+{
+    currentIdx = current.row();
+    updateButtons(currentIdx);
+}
+
+void VersionPage::preselect(int row)
+{
+    if(row < 0)
+    {
+        row = 0;
+    }
+    if(row >= m_profile->rowCount(QModelIndex()))
+    {
+        row = m_profile->rowCount(QModelIndex()) - 1;
+    }
+    if(row < 0)
+    {
+        return;
+    }
+    auto model_index = m_profile->index(row);
+    ui->packageView->selectionModel()->select(model_index, QItemSelectionModel::SelectCurrent | QItemSelectionModel::Rows);
+    updateButtons(row);
+}
+
+void VersionPage::onGameUpdateError(QString error)
+{
+    CustomMessageBox::selectable(this, tr("Error updating instance"), error, QMessageBox::Warning)->show();
+}
+
+Component * VersionPage::current()
+{
+    auto row = currentRow();
+    if(row < 0)
+    {
+        return nullptr;
+    }
+    return m_profile->getComponent(row);
+}
+
+int VersionPage::currentRow()
+{
+    if (ui->packageView->selectionModel()->selectedRows().isEmpty())
+    {
+        return -1;
+    }
+    return ui->packageView->selectionModel()->selectedRows().first().row();
+}
+
+void VersionPage::on_actionCustomize_triggered()
+{
+    auto version = currentRow();
+    if(version == -1)
+    {
+        return;
+    }
+    auto patch = m_profile->getComponent(version);
+    if(!patch->getVersionFile())
+    {
+        // TODO: wait for the update task to finish here...
+        return;
+    }
+    if(!m_profile->customize(version))
+    {
+        // TODO: some error box here
+    }
+    updateButtons();
+    preselect(currentIdx);
+}
+
+void VersionPage::on_actionEdit_triggered()
+{
+    auto version = current();
+    if(!version)
+    {
+        return;
+    }
+    auto filename = version->getFilename();
+    if(!QFileInfo::exists(filename))
+    {
+        qWarning() << "file" << filename << "can't be opened for editing, doesn't exist!";
+        return;
+    }
+    APPLICATION->openJsonEditor(filename);
+}
+
+void VersionPage::on_actionRevert_triggered()
+{
+    auto version = currentRow();
+    if(version == -1)
+    {
+        return;
+    }
+    if(!m_profile->revertToBase(version))
+    {
+        // TODO: some error box here
+    }
+    updateButtons();
+    preselect(currentIdx);
+    m_container->refreshContainer();
+}
+
+void VersionPage::onFilterTextChanged(const QString &newContents)
+{
+    m_filterModel->setFilterFixedString(newContents);
+}
+
+#include "VersionPage.moc"
+

launcher/ui/pages/instance/VersionPage.h

@@ -0,0 +1,104 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QMainWindow>
+
+#include "minecraft/MinecraftInstance.h"
+#include "minecraft/PackProfile.h"
+#include "ui/pages/BasePage.h"
+
+namespace Ui
+{
+class VersionPage;
+}
+
+class VersionPage : public QMainWindow, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit VersionPage(MinecraftInstance *inst, QWidget *parent = 0);
+    virtual ~VersionPage();
+    virtual QString displayName() const override
+    {
+        return tr("Version");
+    }
+    virtual QIcon icon() const override;
+    virtual QString id() const override
+    {
+        return "version";
+    }
+    virtual QString helpPage() const override
+    {
+        return "Instance-Version";
+    }
+    virtual bool shouldDisplay() const override;
+
+private slots:
+    void on_actionChange_version_triggered();
+    void on_actionInstall_Forge_triggered();
+    void on_actionInstall_Fabric_triggered();
+    void on_actionAdd_Empty_triggered();
+    void on_actionInstall_LiteLoader_triggered();
+    void on_actionReload_triggered();
+    void on_actionRemove_triggered();
+    void on_actionMove_up_triggered();
+    void on_actionMove_down_triggered();
+    void on_actionAdd_to_Minecraft_jar_triggered();
+    void on_actionReplace_Minecraft_jar_triggered();
+    void on_actionRevert_triggered();
+    void on_actionEdit_triggered();
+    void on_actionInstall_mods_triggered();
+    void on_actionCustomize_triggered();
+    void on_actionDownload_All_triggered();
+
+    void on_actionMinecraftFolder_triggered();
+    void on_actionLibrariesFolder_triggered();
+
+    void updateVersionControls();
+
+private:
+    Component * current();
+    int currentRow();
+    void updateButtons(int row = -1);
+    void preselect(int row = 0);
+    int doUpdate();
+
+protected:
+    QMenu * createPopupMenu() override;
+
+    /// FIXME: this shouldn't be necessary!
+    bool reloadPackProfile();
+
+private:
+    Ui::VersionPage *ui;
+    QSortFilterProxyModel *m_filterModel;
+    std::shared_ptr<PackProfile> m_profile;
+    MinecraftInstance *m_inst;
+    int currentIdx = 0;
+    bool controlsEnabled = false;
+
+public slots:
+    void versionCurrent(const QModelIndex &current, const QModelIndex &previous);
+
+private slots:
+    void updateRunningStatus(bool running);
+    void onGameUpdateError(QString error);
+    void packageCurrent(const QModelIndex &current, const QModelIndex &previous);
+    void showContextMenu(const QPoint &pos);
+    void onFilterTextChanged(const QString & newContents);
+};

launcher/ui/pages/instance/VersionPage.ui

@@ -0,0 +1,285 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>VersionPage</class>
+ <widget class="QMainWindow" name="VersionPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>961</width>
+    <height>1091</height>
+   </rect>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QHBoxLayout" name="horizontalLayout">
+    <property name="leftMargin">
+     <number>0</number>
+    </property>
+    <property name="topMargin">
+     <number>0</number>
+    </property>
+    <property name="rightMargin">
+     <number>0</number>
+    </property>
+    <property name="bottomMargin">
+     <number>0</number>
+    </property>
+    <item>
+     <layout class="QVBoxLayout" name="verticalLayout">
+      <item>
+       <widget class="ModListView" name="packageView">
+        <property name="verticalScrollBarPolicy">
+         <enum>Qt::ScrollBarAlwaysOn</enum>
+        </property>
+        <property name="horizontalScrollBarPolicy">
+         <enum>Qt::ScrollBarAlwaysOff</enum>
+        </property>
+        <property name="sortingEnabled">
+         <bool>false</bool>
+        </property>
+        <property name="headerHidden">
+         <bool>false</bool>
+        </property>
+        <attribute name="headerVisible">
+         <bool>true</bool>
+        </attribute>
+       </widget>
+      </item>
+      <item>
+       <layout class="QGridLayout" name="gridLayout_2">
+        <item row="0" column="1">
+         <widget class="QLineEdit" name="filterEdit">
+          <property name="clearButtonEnabled">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
+        <item row="0" column="0">
+         <widget class="QLabel" name="filterLabel">
+          <property name="text">
+           <string>Filter:</string>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+      <item>
+       <widget class="MCModInfoFrame" name="frame">
+        <property name="sizePolicy">
+         <sizepolicy hsizetype="Preferred" vsizetype="Minimum">
+          <horstretch>0</horstretch>
+          <verstretch>0</verstretch>
+         </sizepolicy>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </item>
+   </layout>
+  </widget>
+  <widget class="WideBar" name="toolBar">
+   <property name="windowTitle">
+    <string>Actions</string>
+   </property>
+   <property name="allowedAreas">
+    <set>Qt::LeftToolBarArea|Qt::RightToolBarArea</set>
+   </property>
+   <property name="toolButtonStyle">
+    <enum>Qt::ToolButtonTextOnly</enum>
+   </property>
+   <property name="floatable">
+    <bool>false</bool>
+   </property>
+   <attribute name="toolBarArea">
+    <enum>RightToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+   <addaction name="actionChange_version"/>
+   <addaction name="actionMove_up"/>
+   <addaction name="actionMove_down"/>
+   <addaction name="actionRemove"/>
+   <addaction name="separator"/>
+   <addaction name="actionCustomize"/>
+   <addaction name="actionEdit"/>
+   <addaction name="actionRevert"/>
+   <addaction name="separator"/>
+   <addaction name="actionInstall_Forge"/>
+   <addaction name="actionInstall_Fabric"/>
+   <addaction name="actionInstall_LiteLoader"/>
+   <addaction name="actionInstall_mods"/>
+   <addaction name="separator"/>
+   <addaction name="actionAdd_to_Minecraft_jar"/>
+   <addaction name="actionReplace_Minecraft_jar"/>
+   <addaction name="actionAdd_Empty"/>
+   <addaction name="separator"/>
+   <addaction name="actionMinecraftFolder"/>
+   <addaction name="actionLibrariesFolder"/>
+   <addaction name="separator"/>
+   <addaction name="actionReload"/>
+   <addaction name="actionDownload_All"/>
+  </widget>
+  <action name="actionChange_version">
+   <property name="text">
+    <string>Change version</string>
+   </property>
+   <property name="toolTip">
+    <string>Change version of the selected package.</string>
+   </property>
+  </action>
+  <action name="actionMove_up">
+   <property name="text">
+    <string>Move up</string>
+   </property>
+   <property name="toolTip">
+    <string>Make the selected package apply sooner.</string>
+   </property>
+  </action>
+  <action name="actionMove_down">
+   <property name="text">
+    <string>Move down</string>
+   </property>
+   <property name="toolTip">
+    <string>Make the selected package apply later.</string>
+   </property>
+  </action>
+  <action name="actionRemove">
+   <property name="text">
+    <string>Remove</string>
+   </property>
+   <property name="toolTip">
+    <string>Remove selected package from the instance.</string>
+   </property>
+  </action>
+  <action name="actionCustomize">
+   <property name="text">
+    <string>Customize</string>
+   </property>
+   <property name="toolTip">
+    <string>Customize selected package.</string>
+   </property>
+  </action>
+  <action name="actionEdit">
+   <property name="text">
+    <string>Edit</string>
+   </property>
+   <property name="toolTip">
+    <string>Edit selected package.</string>
+   </property>
+  </action>
+  <action name="actionRevert">
+   <property name="text">
+    <string>Revert</string>
+   </property>
+   <property name="toolTip">
+    <string>Revert the selected package to default.</string>
+   </property>
+  </action>
+  <action name="actionInstall_Forge">
+   <property name="text">
+    <string>Install Forge</string>
+   </property>
+   <property name="toolTip">
+    <string>Install the Minecraft Forge package.</string>
+   </property>
+  </action>
+  <action name="actionInstall_Fabric">
+   <property name="text">
+    <string>Install Fabric</string>
+   </property>
+   <property name="toolTip">
+    <string>Install the Fabric Loader package.</string>
+   </property>
+  </action>
+  <action name="actionInstall_LiteLoader">
+   <property name="text">
+    <string>Install LiteLoader</string>
+   </property>
+   <property name="toolTip">
+    <string>Install the LiteLoader package.</string>
+   </property>
+  </action>
+  <action name="actionInstall_mods">
+   <property name="text">
+    <string>Install mods</string>
+   </property>
+   <property name="toolTip">
+    <string>Install normal mods.</string>
+   </property>
+  </action>
+  <action name="actionAdd_to_Minecraft_jar">
+   <property name="text">
+    <string>Add to Minecraft.jar</string>
+   </property>
+   <property name="toolTip">
+    <string>Add a mod into the Minecraft jar file.</string>
+   </property>
+  </action>
+  <action name="actionReplace_Minecraft_jar">
+   <property name="text">
+    <string>Replace Minecraft.jar</string>
+   </property>
+  </action>
+  <action name="actionAdd_Empty">
+   <property name="text">
+    <string>Add Empty</string>
+   </property>
+   <property name="toolTip">
+    <string>Add an empty custom package.</string>
+   </property>
+  </action>
+  <action name="actionReload">
+   <property name="text">
+    <string>Reload</string>
+   </property>
+   <property name="toolTip">
+    <string>Reload all packages.</string>
+   </property>
+  </action>
+  <action name="actionDownload_All">
+   <property name="text">
+    <string>Download All</string>
+   </property>
+   <property name="toolTip">
+    <string>Download the files needed to launch the instance now.</string>
+   </property>
+  </action>
+  <action name="actionMinecraftFolder">
+   <property name="text">
+    <string>Open .minecraft</string>
+   </property>
+   <property name="toolTip">
+    <string>Open the instance's .minecraft folder.</string>
+   </property>
+  </action>
+  <action name="actionLibrariesFolder">
+   <property name="text">
+    <string>Open libraries</string>
+   </property>
+   <property name="toolTip">
+    <string>Open the instance's local libraries folder.</string>
+   </property>
+  </action>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>ModListView</class>
+   <extends>QTreeView</extends>
+   <header>ui/widgets/ModListView.h</header>
+  </customwidget>
+  <customwidget>
+   <class>MCModInfoFrame</class>
+   <extends>QFrame</extends>
+   <header>ui/widgets/MCModInfoFrame.h</header>
+   <container>1</container>
+  </customwidget>
+  <customwidget>
+   <class>WideBar</class>
+   <extends>QToolBar</extends>
+   <header>ui/widgets/WideBar.h</header>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/instance/WorldListPage.cpp

@@ -0,0 +1,412 @@
+/* Copyright 2015-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "WorldListPage.h"
+#include "ui_WorldListPage.h"
+#include "minecraft/WorldList.h"
+
+#include <QEvent>
+#include <QMenu>
+#include <QKeyEvent>
+#include <QClipboard>
+#include <QMessageBox>
+#include <QTreeView>
+#include <QInputDialog>
+#include <QProcess>
+
+#include "tools/MCEditTool.h"
+#include "FileSystem.h"
+
+#include "ui/GuiUtil.h"
+#include "DesktopServices.h"
+
+#include "Application.h"
+
+
+class WorldListProxyModel : public QSortFilterProxyModel
+{
+    Q_OBJECT
+
+public:
+    WorldListProxyModel(QObject *parent) : QSortFilterProxyModel(parent) {}
+
+    virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const
+    {
+        QModelIndex sourceIndex = mapToSource(index);
+
+        if (index.column() == 0 && role == Qt::DecorationRole)
+        {
+            WorldList *worlds = qobject_cast<WorldList *>(sourceModel());
+            auto iconFile = worlds->data(sourceIndex, WorldList::IconFileRole).toString();
+            if(iconFile.isNull()) {
+                // NOTE: Minecraft uses the same placeholder for servers AND worlds
+                return APPLICATION->getThemedIcon("unknown_server");
+            }
+            return QIcon(iconFile);
+        }
+
+        return sourceIndex.data(role);
+    }
+};
+
+
+WorldListPage::WorldListPage(BaseInstance *inst, std::shared_ptr<WorldList> worlds, QWidget *parent)
+    : QMainWindow(parent), m_inst(inst), ui(new Ui::WorldListPage), m_worlds(worlds)
+{
+    ui->setupUi(this);
+
+    ui->toolBar->insertSpacer(ui->actionRefresh);
+
+    WorldListProxyModel * proxy = new WorldListProxyModel(this);
+    proxy->setSortCaseSensitivity(Qt::CaseInsensitive);
+    proxy->setSourceModel(m_worlds.get());
+    ui->worldTreeView->setSortingEnabled(true);
+    ui->worldTreeView->setModel(proxy);
+    ui->worldTreeView->installEventFilter(this);
+    ui->worldTreeView->setContextMenuPolicy(Qt::CustomContextMenu);
+    ui->worldTreeView->setIconSize(QSize(64,64));
+    connect(ui->worldTreeView, &QTreeView::customContextMenuRequested, this, &WorldListPage::ShowContextMenu);
+
+    auto head = ui->worldTreeView->header();
+    head->setSectionResizeMode(0, QHeaderView::Stretch);
+    head->setSectionResizeMode(1, QHeaderView::ResizeToContents);
+
+    connect(ui->worldTreeView->selectionModel(), &QItemSelectionModel::currentChanged, this, &WorldListPage::worldChanged);
+    worldChanged(QModelIndex(), QModelIndex());
+}
+
+void WorldListPage::openedImpl()
+{
+    m_worlds->startWatching();
+}
+
+void WorldListPage::closedImpl()
+{
+    m_worlds->stopWatching();
+}
+
+WorldListPage::~WorldListPage()
+{
+    m_worlds->stopWatching();
+    delete ui;
+}
+
+void WorldListPage::ShowContextMenu(const QPoint& pos)
+{
+    auto menu = ui->toolBar->createContextMenu(this, tr("Context menu"));
+    menu->exec(ui->worldTreeView->mapToGlobal(pos));
+    delete menu;
+}
+
+QMenu * WorldListPage::createPopupMenu()
+{
+    QMenu* filteredMenu = QMainWindow::createPopupMenu();
+    filteredMenu->removeAction( ui->toolBar->toggleViewAction() );
+    return filteredMenu;
+}
+
+bool WorldListPage::shouldDisplay() const
+{
+    return true;
+}
+
+bool WorldListPage::worldListFilter(QKeyEvent *keyEvent)
+{
+    switch (keyEvent->key())
+    {
+    case Qt::Key_Delete:
+        on_actionRemove_triggered();
+        return true;
+    default:
+        break;
+    }
+    return QWidget::eventFilter(ui->worldTreeView, keyEvent);
+}
+
+bool WorldListPage::eventFilter(QObject *obj, QEvent *ev)
+{
+    if (ev->type() != QEvent::KeyPress)
+    {
+        return QWidget::eventFilter(obj, ev);
+    }
+    QKeyEvent *keyEvent = static_cast<QKeyEvent *>(ev);
+    if (obj == ui->worldTreeView)
+        return worldListFilter(keyEvent);
+    return QWidget::eventFilter(obj, ev);
+}
+
+void WorldListPage::on_actionRemove_triggered()
+{
+    auto proxiedIndex = getSelectedWorld();
+
+    if(!proxiedIndex.isValid())
+        return;
+
+    auto result = QMessageBox::question(this,
+                tr("Are you sure?"),
+                tr("This will remove the selected world permenantly.\n"
+                    "The world will be gone forever (A LONG TIME).\n"
+                    "\n"
+                    "Do you want to continue?"));
+    if(result != QMessageBox::Yes)
+    {
+        return;
+    }
+    m_worlds->stopWatching();
+    m_worlds->deleteWorld(proxiedIndex.row());
+    m_worlds->startWatching();
+}
+
+void WorldListPage::on_actionView_Folder_triggered()
+{
+    DesktopServices::openDirectory(m_worlds->dir().absolutePath(), true);
+}
+
+void WorldListPage::on_actionDatapacks_triggered()
+{
+    QModelIndex index = getSelectedWorld();
+
+    if (!index.isValid())
+    {
+        return;
+    }
+
+    if(!worldSafetyNagQuestion())
+        return;
+
+    auto fullPath = m_worlds->data(index, WorldList::FolderRole).toString();
+
+    DesktopServices::openDirectory(FS::PathCombine(fullPath, "datapacks"), true);
+}
+
+
+void WorldListPage::on_actionReset_Icon_triggered()
+{
+    auto proxiedIndex = getSelectedWorld();
+
+    if(!proxiedIndex.isValid())
+        return;
+
+    if(m_worlds->resetIcon(proxiedIndex.row())) {
+        ui->actionReset_Icon->setEnabled(false);
+    }
+}
+
+
+QModelIndex WorldListPage::getSelectedWorld()
+{
+    auto index = ui->worldTreeView->selectionModel()->currentIndex();
+
+    auto proxy = (QSortFilterProxyModel *) ui->worldTreeView->model();
+    return proxy->mapToSource(index);
+}
+
+void WorldListPage::on_actionCopy_Seed_triggered()
+{
+    QModelIndex index = getSelectedWorld();
+
+    if (!index.isValid())
+    {
+        return;
+    }
+    int64_t seed = m_worlds->data(index, WorldList::SeedRole).toLongLong();
+    APPLICATION->clipboard()->setText(QString::number(seed));
+}
+
+void WorldListPage::on_actionMCEdit_triggered()
+{
+    if(m_mceditStarting)
+        return;
+
+    auto mcedit = APPLICATION->mcedit();
+
+    const QString mceditPath = mcedit->path();
+
+    QModelIndex index = getSelectedWorld();
+
+    if (!index.isValid())
+    {
+        return;
+    }
+
+    if(!worldSafetyNagQuestion())
+        return;
+
+    auto fullPath = m_worlds->data(index, WorldList::FolderRole).toString();
+
+    auto program = mcedit->getProgramPath();
+    if(program.size())
+    {
+#ifdef Q_OS_WIN32
+        if(!QProcess::startDetached(program, {fullPath}, mceditPath))
+        {
+            mceditError();
+        }
+#else
+        m_mceditProcess.reset(new LoggedProcess());
+        m_mceditProcess->setDetachable(true);
+        connect(m_mceditProcess.get(), &LoggedProcess::stateChanged, this, &WorldListPage::mceditState);
+        m_mceditProcess->start(program, {fullPath});
+        m_mceditProcess->setWorkingDirectory(mceditPath);
+        m_mceditStarting = true;
+#endif
+    }
+    else
+    {
+        QMessageBox::warning(
+            this->parentWidget(),
+            tr("No MCEdit found or set up!"),
+            tr("You do not have MCEdit set up or it was moved.\nYou can set it up in the global settings.")
+        );
+    }
+}
+
+void WorldListPage::mceditError()
+{
+    QMessageBox::warning(
+        this->parentWidget(),
+        tr("MCEdit failed to start!"),
+        tr("MCEdit failed to start.\nIt may be necessary to reinstall it.")
+    );
+}
+
+void WorldListPage::mceditState(LoggedProcess::State state)
+{
+    bool failed = false;
+    switch(state)
+    {
+        case LoggedProcess::NotRunning:
+        case LoggedProcess::Starting:
+            return;
+        case LoggedProcess::FailedToStart:
+        case LoggedProcess::Crashed:
+        case LoggedProcess::Aborted:
+        {
+            failed = true;
+        }
+        case LoggedProcess::Running:
+        case LoggedProcess::Finished:
+        {
+            m_mceditStarting = false;
+            break;
+        }
+    }
+    if(failed)
+    {
+        mceditError();
+    }
+}
+
+void WorldListPage::worldChanged(const QModelIndex &current, const QModelIndex &previous)
+{
+    QModelIndex index = getSelectedWorld();
+    bool enable = index.isValid();
+    ui->actionCopy_Seed->setEnabled(enable);
+    ui->actionMCEdit->setEnabled(enable);
+    ui->actionRemove->setEnabled(enable);
+    ui->actionCopy->setEnabled(enable);
+    ui->actionRename->setEnabled(enable);
+    ui->actionDatapacks->setEnabled(enable);
+    bool hasIcon = !index.data(WorldList::IconFileRole).isNull();
+    ui->actionReset_Icon->setEnabled(enable && hasIcon);
+}
+
+void WorldListPage::on_actionAdd_triggered()
+{
+    auto list = GuiUtil::BrowseForFiles(
+        displayName(),
+        tr("Select a Minecraft world zip"),
+        tr("Minecraft World Zip File (*.zip)"), QString(), this->parentWidget());
+    if (!list.empty())
+    {
+        m_worlds->stopWatching();
+        for (auto filename : list)
+        {
+            m_worlds->installWorld(QFileInfo(filename));
+        }
+        m_worlds->startWatching();
+    }
+}
+
+bool WorldListPage::isWorldSafe(QModelIndex)
+{
+    return !m_inst->isRunning();
+}
+
+bool WorldListPage::worldSafetyNagQuestion()
+{
+    if(!isWorldSafe(getSelectedWorld()))
+    {
+        auto result = QMessageBox::question(this, tr("Copy World"), tr("Changing a world while Minecraft is running is potentially unsafe.\nDo you wish to proceed?"));
+        if(result == QMessageBox::No)
+        {
+            return false;
+        }
+    }
+    return true;
+}
+
+
+void WorldListPage::on_actionCopy_triggered()
+{
+    QModelIndex index = getSelectedWorld();
+    if (!index.isValid())
+    {
+        return;
+    }
+
+    if(!worldSafetyNagQuestion())
+        return;
+
+    auto worldVariant = m_worlds->data(index, WorldList::ObjectRole);
+    auto world = (World *) worldVariant.value<void *>();
+    bool ok = false;
+    QString name = QInputDialog::getText(this, tr("World name"), tr("Enter a new name for the copy."), QLineEdit::Normal, world->name(), &ok);
+
+    if (ok && name.length() > 0)
+    {
+        world->install(m_worlds->dir().absolutePath(), name);
+    }
+}
+
+void WorldListPage::on_actionRename_triggered()
+{
+    QModelIndex index = getSelectedWorld();
+    if (!index.isValid())
+    {
+        return;
+    }
+
+    if(!worldSafetyNagQuestion())
+        return;
+
+    auto worldVariant = m_worlds->data(index, WorldList::ObjectRole);
+    auto world = (World *) worldVariant.value<void *>();
+
+    bool ok = false;
+    QString name = QInputDialog::getText(this, tr("World name"), tr("Enter a new world name."), QLineEdit::Normal, world->name(), &ok);
+
+    if (ok && name.length() > 0)
+    {
+        world->rename(name);
+    }
+}
+
+void WorldListPage::on_actionRefresh_triggered()
+{
+    m_worlds->update();
+}
+
+#include "WorldListPage.moc"

launcher/ui/pages/instance/WorldListPage.h

@@ -0,0 +1,99 @@
+/* Copyright 2015-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QMainWindow>
+
+#include "minecraft/MinecraftInstance.h"
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+#include <LoggedProcess.h>
+
+class WorldList;
+namespace Ui
+{
+class WorldListPage;
+}
+
+class WorldListPage : public QMainWindow, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit WorldListPage(
+        BaseInstance *inst,
+        std::shared_ptr<WorldList> worlds,
+        QWidget *parent = 0
+    );
+    virtual ~WorldListPage();
+
+    virtual QString displayName() const override
+    {
+        return tr("Worlds");
+    }
+    virtual QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("worlds");
+    }
+    virtual QString id() const override
+    {
+        return "worlds";
+    }
+    virtual QString helpPage() const override
+    {
+        return "Worlds";
+    }
+    virtual bool shouldDisplay() const override;
+
+    virtual void openedImpl() override;
+    virtual void closedImpl() override;
+
+protected:
+    bool eventFilter(QObject *obj, QEvent *ev) override;
+    bool worldListFilter(QKeyEvent *ev);
+    QMenu * createPopupMenu() override;
+
+protected:
+    BaseInstance *m_inst;
+
+private:
+    QModelIndex getSelectedWorld();
+    bool isWorldSafe(QModelIndex index);
+    bool worldSafetyNagQuestion();
+    void mceditError();
+
+private:
+    Ui::WorldListPage *ui;
+    std::shared_ptr<WorldList> m_worlds;
+    unique_qobject_ptr<LoggedProcess> m_mceditProcess;
+    bool m_mceditStarting = false;
+
+private slots:
+    void on_actionCopy_Seed_triggered();
+    void on_actionMCEdit_triggered();
+    void on_actionRemove_triggered();
+    void on_actionAdd_triggered();
+    void on_actionCopy_triggered();
+    void on_actionRename_triggered();
+    void on_actionRefresh_triggered();
+    void on_actionView_Folder_triggered();
+    void on_actionDatapacks_triggered();
+    void on_actionReset_Icon_triggered();
+    void worldChanged(const QModelIndex &current, const QModelIndex &previous);
+    void mceditState(LoggedProcess::State state);
+
+    void ShowContextMenu(const QPoint &pos);
+};

launcher/ui/pages/instance/WorldListPage.ui

@@ -0,0 +1,161 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>WorldListPage</class>
+ <widget class="QMainWindow" name="WorldListPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>800</width>
+    <height>600</height>
+   </rect>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QHBoxLayout" name="horizontalLayout">
+    <property name="leftMargin">
+     <number>0</number>
+    </property>
+    <property name="topMargin">
+     <number>0</number>
+    </property>
+    <property name="rightMargin">
+     <number>0</number>
+    </property>
+    <property name="bottomMargin">
+     <number>0</number>
+    </property>
+    <item>
+     <widget class="QTreeView" name="worldTreeView">
+      <property name="sizePolicy">
+       <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+        <horstretch>0</horstretch>
+        <verstretch>0</verstretch>
+       </sizepolicy>
+      </property>
+      <property name="acceptDrops">
+       <bool>true</bool>
+      </property>
+      <property name="dragDropMode">
+       <enum>QAbstractItemView::DragDrop</enum>
+      </property>
+      <property name="alternatingRowColors">
+       <bool>true</bool>
+      </property>
+      <property name="rootIsDecorated">
+       <bool>false</bool>
+      </property>
+      <property name="itemsExpandable">
+       <bool>false</bool>
+      </property>
+      <property name="sortingEnabled">
+       <bool>true</bool>
+      </property>
+      <property name="allColumnsShowFocus">
+       <bool>true</bool>
+      </property>
+      <attribute name="headerStretchLastSection">
+       <bool>false</bool>
+      </attribute>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+  <widget class="WideBar" name="toolBar">
+   <property name="windowTitle">
+    <string>Actions</string>
+   </property>
+   <property name="allowedAreas">
+    <set>Qt::LeftToolBarArea|Qt::RightToolBarArea</set>
+   </property>
+   <property name="toolButtonStyle">
+    <enum>Qt::ToolButtonTextOnly</enum>
+   </property>
+   <property name="floatable">
+    <bool>false</bool>
+   </property>
+   <attribute name="toolBarArea">
+    <enum>RightToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+   <addaction name="actionAdd"/>
+   <addaction name="separator"/>
+   <addaction name="actionRename"/>
+   <addaction name="actionCopy"/>
+   <addaction name="actionRemove"/>
+   <addaction name="actionMCEdit"/>
+   <addaction name="actionDatapacks"/>
+   <addaction name="actionReset_Icon"/>
+   <addaction name="separator"/>
+   <addaction name="actionCopy_Seed"/>
+   <addaction name="actionRefresh"/>
+   <addaction name="actionView_Folder"/>
+  </widget>
+  <action name="actionAdd">
+   <property name="text">
+    <string>Add</string>
+   </property>
+  </action>
+  <action name="actionRename">
+   <property name="text">
+    <string>Rename</string>
+   </property>
+  </action>
+  <action name="actionCopy">
+   <property name="text">
+    <string>Copy</string>
+   </property>
+  </action>
+  <action name="actionRemove">
+   <property name="text">
+    <string>Remove</string>
+   </property>
+  </action>
+  <action name="actionMCEdit">
+   <property name="text">
+    <string>MCEdit</string>
+   </property>
+  </action>
+  <action name="actionCopy_Seed">
+   <property name="text">
+    <string>Copy Seed</string>
+   </property>
+  </action>
+  <action name="actionRefresh">
+   <property name="text">
+    <string>Refresh</string>
+   </property>
+  </action>
+  <action name="actionView_Folder">
+   <property name="text">
+    <string>View Folder</string>
+   </property>
+  </action>
+  <action name="actionReset_Icon">
+   <property name="text">
+    <string>Reset Icon</string>
+   </property>
+   <property name="toolTip">
+    <string>Remove world icon to make the game re-generate it on next load.</string>
+   </property>
+  </action>
+  <action name="actionDatapacks">
+   <property name="text">
+    <string>Datapacks</string>
+   </property>
+   <property name="toolTip">
+    <string>Manage datapacks inside the world.</string>
+   </property>
+  </action>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>WideBar</class>
+   <extends>QToolBar</extends>
+   <header>ui/widgets/WideBar.h</header>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/modplatform/ImportPage.cpp

@@ -0,0 +1,132 @@
+#include "ImportPage.h"
+#include "ui_ImportPage.h"
+
+#include <QFileDialog>
+#include <QValidator>
+
+#include "ui/dialogs/NewInstanceDialog.h"
+
+#include "InstanceImportTask.h"
+
+
+class UrlValidator : public QValidator
+{
+public:
+    using QValidator::QValidator;
+
+    State validate(QString &in, int &pos) const
+    {
+        const QUrl url(in);
+        if (url.isValid() && !url.isRelative() && !url.isEmpty())
+        {
+            return Acceptable;
+        }
+        else if (QFile::exists(in))
+        {
+            return Acceptable;
+        }
+        else
+        {
+            return Intermediate;
+        }
+    }
+};
+
+ImportPage::ImportPage(NewInstanceDialog* dialog, QWidget *parent)
+    : QWidget(parent), ui(new Ui::ImportPage), dialog(dialog)
+{
+    ui->setupUi(this);
+    ui->modpackEdit->setValidator(new UrlValidator(ui->modpackEdit));
+    connect(ui->modpackEdit, &QLineEdit::textChanged, this, &ImportPage::updateState);
+}
+
+ImportPage::~ImportPage()
+{
+    delete ui;
+}
+
+bool ImportPage::shouldDisplay() const
+{
+    return true;
+}
+
+void ImportPage::openedImpl()
+{
+    updateState();
+}
+
+void ImportPage::updateState()
+{
+    if(!isOpened)
+    {
+        return;
+    }
+    if(ui->modpackEdit->hasAcceptableInput())
+    {
+        QString input = ui->modpackEdit->text();
+        auto url = QUrl::fromUserInput(input);
+        if(url.isLocalFile())
+        {
+            // FIXME: actually do some validation of what's inside here... this is fake AF
+            QFileInfo fi(input);
+            if(fi.exists() && fi.suffix() == "zip")
+            {
+                QFileInfo fi(url.fileName());
+                dialog->setSuggestedPack(fi.completeBaseName(), new InstanceImportTask(url));
+                dialog->setSuggestedIcon("default");
+            }
+        }
+        else
+        {
+            if(input.endsWith("?client=y")) {
+                input.chop(9);
+                input.append("/file");
+                url = QUrl::fromUserInput(input);
+            }
+            // hook, line and sinker.
+            QFileInfo fi(url.fileName());
+            dialog->setSuggestedPack(fi.completeBaseName(), new InstanceImportTask(url));
+            dialog->setSuggestedIcon("default");
+        }
+    }
+    else
+    {
+        dialog->setSuggestedPack();
+    }
+}
+
+void ImportPage::setUrl(const QString& url)
+{
+    ui->modpackEdit->setText(url);
+    updateState();
+}
+
+void ImportPage::on_modpackBtn_clicked()
+{
+    const QUrl url = QFileDialog::getOpenFileUrl(this, tr("Choose modpack"), modpackUrl(), tr("Zip (*.zip)"));
+    if (url.isValid())
+    {
+        if (url.isLocalFile())
+        {
+            ui->modpackEdit->setText(url.toLocalFile());
+        }
+        else
+        {
+            ui->modpackEdit->setText(url.toString());
+        }
+    }
+}
+
+
+QUrl ImportPage::modpackUrl() const
+{
+    const QUrl url(ui->modpackEdit->text());
+    if (url.isValid() && !url.isRelative() && !url.host().isEmpty())
+    {
+        return url;
+    }
+    else
+    {
+        return QUrl::fromLocalFile(ui->modpackEdit->text());
+    }
+}

launcher/ui/pages/modplatform/ImportPage.h

@@ -0,0 +1,70 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QWidget>
+
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+#include "tasks/Task.h"
+
+namespace Ui
+{
+class ImportPage;
+}
+
+class NewInstanceDialog;
+
+class ImportPage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit ImportPage(NewInstanceDialog* dialog, QWidget *parent = 0);
+    virtual ~ImportPage();
+    virtual QString displayName() const override
+    {
+        return tr("Import from zip");
+    }
+    virtual QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("viewfolder");
+    }
+    virtual QString id() const override
+    {
+        return "import";
+    }
+    virtual QString helpPage() const override
+    {
+        return "Zip-import";
+    }
+    virtual bool shouldDisplay() const override;
+
+    void setUrl(const QString & url);
+    void openedImpl() override;
+
+private slots:
+    void on_modpackBtn_clicked();
+    void updateState();
+
+private:
+    QUrl modpackUrl() const;
+
+private:
+    Ui::ImportPage *ui = nullptr;
+    NewInstanceDialog* dialog = nullptr;
+};
+

launcher/ui/pages/modplatform/ImportPage.ui

@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>ImportPage</class>
+ <widget class="QWidget" name="ImportPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>546</width>
+    <height>405</height>
+   </rect>
+  </property>
+  <layout class="QGridLayout" name="gridLayout">
+   <item row="1" column="1">
+    <widget class="QPushButton" name="modpackBtn">
+     <property name="text">
+      <string>Browse</string>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="0">
+    <widget class="QLineEdit" name="modpackEdit">
+     <property name="placeholderText">
+      <string notr="true">http://</string>
+     </property>
+    </widget>
+   </item>
+   <item row="0" column="0" colspan="2">
+    <widget class="QLabel" name="modpackLabel">
+     <property name="text">
+      <string>Local file or link to a direct download:</string>
+     </property>
+    </widget>
+   </item>
+   <item row="2" column="0" colspan="2">
+    <spacer name="verticalSpacer">
+     <property name="orientation">
+      <enum>Qt::Vertical</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>20</width>
+       <height>40</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/modplatform/VanillaPage.cpp

@@ -0,0 +1,103 @@
+#include "VanillaPage.h"
+#include "ui_VanillaPage.h"
+
+#include <QTabBar>
+
+#include "Application.h"
+#include "meta/Index.h"
+#include "meta/VersionList.h"
+#include "ui/dialogs/NewInstanceDialog.h"
+#include "Filter.h"
+#include "InstanceCreationTask.h"
+
+VanillaPage::VanillaPage(NewInstanceDialog *dialog, QWidget *parent)
+    : QWidget(parent), dialog(dialog), ui(new Ui::VanillaPage)
+{
+    ui->setupUi(this);
+    ui->tabWidget->tabBar()->hide();
+    connect(ui->versionList, &VersionSelectWidget::selectedVersionChanged, this, &VanillaPage::setSelectedVersion);
+    filterChanged();
+    connect(ui->alphaFilter, &QCheckBox::stateChanged, this, &VanillaPage::filterChanged);
+    connect(ui->betaFilter, &QCheckBox::stateChanged, this, &VanillaPage::filterChanged);
+    connect(ui->snapshotFilter, &QCheckBox::stateChanged, this, &VanillaPage::filterChanged);
+    connect(ui->oldSnapshotFilter, &QCheckBox::stateChanged, this, &VanillaPage::filterChanged);
+    connect(ui->releaseFilter, &QCheckBox::stateChanged, this, &VanillaPage::filterChanged);
+    connect(ui->experimentsFilter, &QCheckBox::stateChanged, this, &VanillaPage::filterChanged);
+    connect(ui->refreshBtn, &QPushButton::clicked, this, &VanillaPage::refresh);
+}
+
+void VanillaPage::openedImpl()
+{
+    if(!initialized)
+    {
+        auto vlist = APPLICATION->metadataIndex()->get("net.minecraft");
+        ui->versionList->initialize(vlist.get());
+        initialized = true;
+    }
+    else
+    {
+        suggestCurrent();
+    }
+}
+
+void VanillaPage::refresh()
+{
+    ui->versionList->loadList();
+}
+
+void VanillaPage::filterChanged()
+{
+    QStringList out;
+    if(ui->alphaFilter->isChecked())
+        out << "(old_alpha)";
+    if(ui->betaFilter->isChecked())
+        out << "(old_beta)";
+    if(ui->snapshotFilter->isChecked())
+        out << "(snapshot)";
+    if(ui->oldSnapshotFilter->isChecked())
+        out << "(old_snapshot)";
+    if(ui->releaseFilter->isChecked())
+        out << "(release)";
+    if(ui->experimentsFilter->isChecked())
+        out << "(experiment)";
+    auto regexp = out.join('|');
+    ui->versionList->setFilter(BaseVersionList::TypeRole, new RegexpFilter(regexp, false));
+}
+
+VanillaPage::~VanillaPage()
+{
+    delete ui;
+}
+
+bool VanillaPage::shouldDisplay() const
+{
+    return true;
+}
+
+BaseVersionPtr VanillaPage::selectedVersion() const
+{
+    return m_selectedVersion;
+}
+
+void VanillaPage::suggestCurrent()
+{
+    if (!isOpened)
+    {
+        return;
+    }
+        
+    if(!m_selectedVersion)
+    {
+        dialog->setSuggestedPack();
+        return;
+    }
+
+    dialog->setSuggestedPack(m_selectedVersion->descriptor(), new InstanceCreationTask(m_selectedVersion));
+    dialog->setSuggestedIcon("default");
+}
+
+void VanillaPage::setSelectedVersion(BaseVersionPtr version)
+{
+    m_selectedVersion = version;
+    suggestCurrent();
+}

launcher/ui/pages/modplatform/VanillaPage.h

@@ -0,0 +1,75 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QWidget>
+
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+#include "tasks/Task.h"
+
+namespace Ui
+{
+class VanillaPage;
+}
+
+class NewInstanceDialog;
+
+class VanillaPage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit VanillaPage(NewInstanceDialog *dialog, QWidget *parent = 0);
+    virtual ~VanillaPage();
+    virtual QString displayName() const override
+    {
+        return tr("Vanilla");
+    }
+    virtual QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("minecraft");
+    }
+    virtual QString id() const override
+    {
+        return "vanilla";
+    }
+    virtual QString helpPage() const override
+    {
+        return "Vanilla-platform";
+    }
+    virtual bool shouldDisplay() const override;
+    void openedImpl() override;
+
+    BaseVersionPtr selectedVersion() const;
+
+public slots:
+    void setSelectedVersion(BaseVersionPtr version);
+
+private slots:
+    void filterChanged();
+
+private:
+    void refresh();
+    void suggestCurrent();
+
+private:
+    bool initialized = false;
+    NewInstanceDialog *dialog = nullptr;
+    Ui::VanillaPage *ui = nullptr;
+    bool m_versionSetByUser = false;
+    BaseVersionPtr m_selectedVersion;
+};

launcher/ui/pages/modplatform/VanillaPage.ui

@@ -0,0 +1,169 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>VanillaPage</class>
+ <widget class="QWidget" name="VanillaPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>815</width>
+    <height>607</height>
+   </rect>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout_5">
+   <property name="leftMargin">
+    <number>0</number>
+   </property>
+   <property name="topMargin">
+    <number>0</number>
+   </property>
+   <property name="rightMargin">
+    <number>0</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <widget class="QTabWidget" name="tabWidget">
+     <property name="currentIndex">
+      <number>0</number>
+     </property>
+     <widget class="QWidget" name="tab">
+      <attribute name="title">
+       <string notr="true"/>
+      </attribute>
+      <layout class="QGridLayout" name="gridLayout_2">
+       <item row="0" column="1">
+        <layout class="QVBoxLayout" name="verticalLayout">
+         <item>
+          <widget class="QLabel" name="label">
+           <property name="text">
+            <string>Filter</string>
+           </property>
+           <property name="alignment">
+            <set>Qt::AlignCenter</set>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QCheckBox" name="releaseFilter">
+           <property name="text">
+            <string>Releases</string>
+           </property>
+           <property name="checkable">
+            <bool>true</bool>
+           </property>
+           <property name="checked">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QCheckBox" name="snapshotFilter">
+           <property name="text">
+            <string>Snapshots</string>
+           </property>
+           <property name="checkable">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QCheckBox" name="oldSnapshotFilter">
+           <property name="text">
+            <string>Old Snapshots</string>
+           </property>
+           <property name="checkable">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QCheckBox" name="betaFilter">
+           <property name="text">
+            <string>Betas</string>
+           </property>
+           <property name="checkable">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QCheckBox" name="alphaFilter">
+           <property name="text">
+            <string>Alphas</string>
+           </property>
+           <property name="checkable">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QCheckBox" name="experimentsFilter">
+           <property name="text">
+            <string>Experiments</string>
+           </property>
+           <property name="checkable">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <spacer name="verticalSpacer">
+           <property name="orientation">
+            <enum>Qt::Vertical</enum>
+           </property>
+           <property name="sizeHint" stdset="0">
+            <size>
+             <width>20</width>
+             <height>40</height>
+            </size>
+           </property>
+          </spacer>
+         </item>
+         <item>
+          <widget class="QPushButton" name="refreshBtn">
+           <property name="text">
+            <string>Refresh</string>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
+       <item row="0" column="0">
+        <widget class="VersionSelectWidget" name="versionList" native="true">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>VersionSelectWidget</class>
+   <extends>QWidget</extends>
+   <header>ui/widgets/VersionSelectWidget.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <tabstops>
+  <tabstop>tabWidget</tabstop>
+  <tabstop>releaseFilter</tabstop>
+  <tabstop>snapshotFilter</tabstop>
+  <tabstop>oldSnapshotFilter</tabstop>
+  <tabstop>betaFilter</tabstop>
+  <tabstop>alphaFilter</tabstop>
+  <tabstop>experimentsFilter</tabstop>
+  <tabstop>refreshBtn</tabstop>
+ </tabstops>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/modplatform/atlauncher/AtlFilterModel.cpp

@@ -0,0 +1,81 @@
+#include "AtlFilterModel.h"
+
+#include <QDebug>
+
+#include <modplatform/atlauncher/ATLPackIndex.h>
+#include <Version.h>
+#include <MMCStrings.h>
+
+namespace Atl {
+
+FilterModel::FilterModel(QObject *parent) : QSortFilterProxyModel(parent)
+{
+    currentSorting = Sorting::ByPopularity;
+    sortings.insert(tr("Sort by popularity"), Sorting::ByPopularity);
+    sortings.insert(tr("Sort by name"), Sorting::ByName);
+    sortings.insert(tr("Sort by game version"), Sorting::ByGameVersion);
+
+    searchTerm = "";
+}
+
+const QMap<QString, FilterModel::Sorting> FilterModel::getAvailableSortings()
+{
+    return sortings;
+}
+
+QString FilterModel::translateCurrentSorting()
+{
+    return sortings.key(currentSorting);
+}
+
+void FilterModel::setSorting(Sorting sorting)
+{
+    currentSorting = sorting;
+    invalidate();
+}
+
+FilterModel::Sorting FilterModel::getCurrentSorting()
+{
+    return currentSorting;
+}
+
+void FilterModel::setSearchTerm(const QString term)
+{
+    searchTerm = term.trimmed();
+    invalidate();
+}
+
+bool FilterModel::filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const
+{
+    if (searchTerm.isEmpty()) {
+        return true;
+    }
+
+    QModelIndex index = sourceModel()->index(sourceRow, 0, sourceParent);
+    ATLauncher::IndexedPack pack = sourceModel()->data(index, Qt::UserRole).value<ATLauncher::IndexedPack>();
+    return pack.name.contains(searchTerm, Qt::CaseInsensitive);
+}
+
+bool FilterModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
+{
+    ATLauncher::IndexedPack leftPack = sourceModel()->data(left, Qt::UserRole).value<ATLauncher::IndexedPack>();
+    ATLauncher::IndexedPack rightPack = sourceModel()->data(right, Qt::UserRole).value<ATLauncher::IndexedPack>();
+
+    if (currentSorting == ByPopularity) {
+        return leftPack.position > rightPack.position;
+    }
+    else if (currentSorting == ByGameVersion) {
+        Version lv(leftPack.versions.at(0).minecraft);
+        Version rv(rightPack.versions.at(0).minecraft);
+        return lv < rv;
+    }
+    else if (currentSorting == ByName) {
+        return Strings::naturalCompare(leftPack.name, rightPack.name, Qt::CaseSensitive) >= 0;
+    }
+
+    // Invalid sorting set, somehow...
+    qWarning() << "Invalid sorting set!";
+    return true;
+}
+
+}

launcher/ui/pages/modplatform/atlauncher/AtlFilterModel.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <QtCore/QSortFilterProxyModel>
+
+namespace Atl {
+
+class FilterModel : public QSortFilterProxyModel
+{
+    Q_OBJECT
+public:
+    FilterModel(QObject* parent = Q_NULLPTR);
+    enum Sorting {
+        ByPopularity,
+        ByGameVersion,
+        ByName,
+    };
+    const QMap<QString, Sorting> getAvailableSortings();
+    QString translateCurrentSorting();
+    void setSorting(Sorting sorting);
+    Sorting getCurrentSorting();
+    void setSearchTerm(QString term);
+
+protected:
+    bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const override;
+    bool lessThan(const QModelIndex &left, const QModelIndex &right) const override;
+
+private:
+    QMap<QString, Sorting> sortings;
+    Sorting currentSorting;
+    QString searchTerm;
+
+};
+
+}

launcher/ui/pages/modplatform/atlauncher/AtlListModel.cpp

@@ -0,0 +1,193 @@
+#include "AtlListModel.h"
+
+#include <BuildConfig.h>
+#include <Application.h>
+#include <Json.h>
+
+namespace Atl {
+
+ListModel::ListModel(QObject *parent) : QAbstractListModel(parent)
+{
+}
+
+ListModel::~ListModel()
+{
+}
+
+int ListModel::rowCount(const QModelIndex &parent) const
+{
+    return modpacks.size();
+}
+
+int ListModel::columnCount(const QModelIndex &parent) const
+{
+    return 1;
+}
+
+QVariant ListModel::data(const QModelIndex &index, int role) const
+{
+    int pos = index.row();
+    if(pos >= modpacks.size() || pos < 0 || !index.isValid())
+    {
+        return QString("INVALID INDEX %1").arg(pos);
+    }
+
+    ATLauncher::IndexedPack pack = modpacks.at(pos);
+    if(role == Qt::DisplayRole)
+    {
+        return pack.name;
+    }
+    else if (role == Qt::ToolTipRole)
+    {
+        return pack.name;
+    }
+    else if(role == Qt::DecorationRole)
+    {
+        if(m_logoMap.contains(pack.safeName))
+        {
+            return (m_logoMap.value(pack.safeName));
+        }
+        auto icon = APPLICATION->getThemedIcon("atlauncher-placeholder");
+
+        auto url = QString(BuildConfig.ATL_DOWNLOAD_SERVER_URL + "launcher/images/%1.png").arg(pack.safeName.toLower());
+        ((ListModel *)this)->requestLogo(pack.safeName, url);
+
+        return icon;
+    }
+    else if(role == Qt::UserRole)
+    {
+        QVariant v;
+        v.setValue(pack);
+        return v;
+    }
+
+    return QVariant();
+}
+
+void ListModel::request()
+{
+    beginResetModel();
+    modpacks.clear();
+    endResetModel();
+
+    auto *netJob = new NetJob("Atl::Request");
+    auto url = QString(BuildConfig.ATL_DOWNLOAD_SERVER_URL + "launcher/json/packsnew.json");
+    netJob->addNetAction(Net::Download::makeByteArray(QUrl(url), &response));
+    jobPtr = netJob;
+    jobPtr->start(APPLICATION->network());
+
+    QObject::connect(netJob, &NetJob::succeeded, this, &ListModel::requestFinished);
+    QObject::connect(netJob, &NetJob::failed, this, &ListModel::requestFailed);
+}
+
+void ListModel::requestFinished()
+{
+    jobPtr.reset();
+
+    QJsonParseError parse_error;
+    QJsonDocument doc = QJsonDocument::fromJson(response, &parse_error);
+    if(parse_error.error != QJsonParseError::NoError) {
+        qWarning() << "Error while parsing JSON response from ATL at " << parse_error.offset << " reason: " << parse_error.errorString();
+        qWarning() << response;
+        return;
+    }
+
+    QList<ATLauncher::IndexedPack> newList;
+
+    auto packs = doc.array();
+    for(auto packRaw : packs) {
+        auto packObj = packRaw.toObject();
+
+        ATLauncher::IndexedPack pack;
+
+        try {
+            ATLauncher::loadIndexedPack(pack, packObj);
+        }
+        catch (const JSONValidationError &e) {
+            qDebug() << QString::fromUtf8(response);
+            qWarning() << "Error while reading pack manifest from ATLauncher: " << e.cause();
+            return;
+        }
+
+        // ignore packs without a published version
+        if(pack.versions.length() == 0) continue;
+        // only display public packs (for now)
+        if(pack.type != ATLauncher::PackType::Public) continue;
+        // ignore "system" packs (Vanilla, Vanilla with Forge, etc)
+        if(pack.system) continue;
+
+        newList.append(pack);
+    }
+
+    beginInsertRows(QModelIndex(), modpacks.size(), modpacks.size() + newList.size() - 1);
+    modpacks.append(newList);
+    endInsertRows();
+}
+
+void ListModel::requestFailed(QString reason)
+{
+    jobPtr.reset();
+}
+
+void ListModel::getLogo(const QString &logo, const QString &logoUrl, LogoCallback callback)
+{
+    if(m_logoMap.contains(logo))
+    {
+        callback(APPLICATION->metacache()->resolveEntry("ATLauncherPacks", QString("logos/%1").arg(logo.section(".", 0, 0)))->getFullPath());
+    }
+    else
+    {
+        requestLogo(logo, logoUrl);
+    }
+}
+
+void ListModel::logoFailed(QString logo)
+{
+    m_failedLogos.append(logo);
+    m_loadingLogos.removeAll(logo);
+}
+
+void ListModel::logoLoaded(QString logo, QIcon out)
+{
+    m_loadingLogos.removeAll(logo);
+    m_logoMap.insert(logo, out);
+
+    for(int i = 0; i < modpacks.size(); i++) {
+        if(modpacks[i].safeName == logo) {
+            emit dataChanged(createIndex(i, 0), createIndex(i, 0), {Qt::DecorationRole});
+        }
+    }
+}
+
+void ListModel::requestLogo(QString file, QString url)
+{
+    if(m_loadingLogos.contains(file) || m_failedLogos.contains(file))
+    {
+        return;
+    }
+
+    MetaEntryPtr entry = APPLICATION->metacache()->resolveEntry("ATLauncherPacks", QString("logos/%1").arg(file.section(".", 0, 0)));
+    NetJob *job = new NetJob(QString("ATLauncher Icon Download %1").arg(file));
+    job->addNetAction(Net::Download::makeCached(QUrl(url), entry));
+
+    auto fullPath = entry->getFullPath();
+    QObject::connect(job, &NetJob::succeeded, this, [this, file, fullPath]
+    {
+        emit logoLoaded(file, QIcon(fullPath));
+        if(waitingCallbacks.contains(file))
+        {
+            waitingCallbacks.value(file)(fullPath);
+        }
+    });
+
+    QObject::connect(job, &NetJob::failed, this, [this, file]
+    {
+        emit logoFailed(file);
+    });
+
+    job->start(APPLICATION->network());
+
+    m_loadingLogos.append(file);
+}
+
+}

launcher/ui/pages/modplatform/atlauncher/AtlListModel.h

@@ -0,0 +1,52 @@
+#pragma once
+
+#include <QAbstractListModel>
+
+#include "net/NetJob.h"
+#include <QIcon>
+#include <modplatform/atlauncher/ATLPackIndex.h>
+
+namespace Atl {
+
+typedef QMap<QString, QIcon> LogoMap;
+typedef std::function<void(QString)> LogoCallback;
+
+class ListModel : public QAbstractListModel
+{
+    Q_OBJECT
+
+public:
+    ListModel(QObject *parent);
+    virtual ~ListModel();
+
+    int rowCount(const QModelIndex &parent) const override;
+    int columnCount(const QModelIndex &parent) const override;
+    QVariant data(const QModelIndex &index, int role) const override;
+
+    void request();
+
+    void getLogo(const QString &logo, const QString &logoUrl, LogoCallback callback);
+
+private slots:
+    void requestFinished();
+    void requestFailed(QString reason);
+
+    void logoFailed(QString logo);
+    void logoLoaded(QString logo, QIcon out);
+
+private:
+    void requestLogo(QString file, QString url);
+
+private:
+    QList<ATLauncher::IndexedPack> modpacks;
+
+    QStringList m_failedLogos;
+    QStringList m_loadingLogos;
+    LogoMap m_logoMap;
+    QMap<QString, LogoCallback> waitingCallbacks;
+
+    NetJob::Ptr jobPtr;
+    QByteArray response;
+};
+
+}

launcher/ui/pages/modplatform/atlauncher/AtlOptionalModDialog.cpp

@@ -0,0 +1,209 @@
+#include "AtlOptionalModDialog.h"
+#include "ui_AtlOptionalModDialog.h"
+
+AtlOptionalModListModel::AtlOptionalModListModel(QWidget *parent, QVector<ATLauncher::VersionMod> mods)
+    : QAbstractListModel(parent), m_mods(mods) {
+
+    // fill mod index
+    for (int i = 0; i < m_mods.size(); i++) {
+        auto mod = m_mods.at(i);
+        m_index[mod.name] = i;
+    }
+    // set initial state
+    for (int i = 0; i < m_mods.size(); i++) {
+        auto mod = m_mods.at(i);
+        m_selection[mod.name] = false;
+        setMod(mod, i, mod.selected, false);
+    }
+}
+
+QVector<QString> AtlOptionalModListModel::getResult() {
+    QVector<QString> result;
+
+    for (const auto& mod : m_mods) {
+        if (m_selection[mod.name]) {
+            result.push_back(mod.name);
+        }
+    }
+
+    return result;
+}
+
+int AtlOptionalModListModel::rowCount(const QModelIndex &parent) const {
+    return m_mods.size();
+}
+
+int AtlOptionalModListModel::columnCount(const QModelIndex &parent) const {
+    // Enabled, Name, Description
+    return 3;
+}
+
+QVariant AtlOptionalModListModel::data(const QModelIndex &index, int role) const {
+    auto row = index.row();
+    auto mod = m_mods.at(row);
+
+    if (role == Qt::DisplayRole) {
+        if (index.column() == NameColumn) {
+            return mod.name;
+        }
+        if (index.column() == DescriptionColumn) {
+            return mod.description;
+        }
+    }
+    else if (role == Qt::ToolTipRole) {
+        if (index.column() == DescriptionColumn) {
+            return mod.description;
+        }
+    }
+    else if (role == Qt::CheckStateRole) {
+        if (index.column() == EnabledColumn) {
+            return m_selection[mod.name] ? Qt::Checked : Qt::Unchecked;
+        }
+    }
+
+    return QVariant();
+}
+
+bool AtlOptionalModListModel::setData(const QModelIndex &index, const QVariant &value, int role) {
+    if (role == Qt::CheckStateRole) {
+        auto row = index.row();
+        auto mod = m_mods.at(row);
+
+        toggleMod(mod, row);
+        return true;
+    }
+
+    return false;
+}
+
+QVariant AtlOptionalModListModel::headerData(int section, Qt::Orientation orientation, int role) const {
+    if (role == Qt::DisplayRole && orientation == Qt::Horizontal) {
+        switch (section) {
+            case EnabledColumn:
+                return QString();
+            case NameColumn:
+                return QString("Name");
+            case DescriptionColumn:
+                return QString("Description");
+        }
+    }
+
+    return QVariant();
+}
+
+Qt::ItemFlags AtlOptionalModListModel::flags(const QModelIndex &index) const {
+    auto flags = QAbstractListModel::flags(index);
+    if (index.isValid() && index.column() == EnabledColumn) {
+        flags |= Qt::ItemIsUserCheckable;
+    }
+    return flags;
+}
+
+void AtlOptionalModListModel::selectRecommended() {
+    for (const auto& mod : m_mods) {
+        m_selection[mod.name] = mod.recommended;
+    }
+
+    emit dataChanged(AtlOptionalModListModel::index(0, EnabledColumn),
+                     AtlOptionalModListModel::index(m_mods.size() - 1, EnabledColumn));
+}
+
+void AtlOptionalModListModel::clearAll() {
+    for (const auto& mod : m_mods) {
+        m_selection[mod.name] = false;
+    }
+
+    emit dataChanged(AtlOptionalModListModel::index(0, EnabledColumn),
+                     AtlOptionalModListModel::index(m_mods.size() - 1, EnabledColumn));
+}
+
+void AtlOptionalModListModel::toggleMod(ATLauncher::VersionMod mod, int index) {
+    setMod(mod, index, !m_selection[mod.name]);
+}
+
+void AtlOptionalModListModel::setMod(ATLauncher::VersionMod mod, int index, bool enable, bool shouldEmit) {
+    if (m_selection[mod.name] == enable) return;
+
+    m_selection[mod.name] = enable;
+
+    // disable other mods in the group, if applicable
+    if (enable && !mod.group.isEmpty()) {
+        for (int i = 0; i < m_mods.size(); i++) {
+            if (index == i) continue;
+            auto other = m_mods.at(i);
+
+            if (mod.group == other.group) {
+                setMod(other, i, false, shouldEmit);
+            }
+        }
+    }
+
+    for (const auto& dependencyName : mod.depends) {
+        auto dependencyIndex = m_index[dependencyName];
+        auto dependencyMod = m_mods.at(dependencyIndex);
+
+        // enable/disable dependencies
+        if (enable) {
+            setMod(dependencyMod, dependencyIndex, true, shouldEmit);
+        }
+
+        // if the dependency is 'effectively hidden', then track which mods
+        // depend on it - so we can efficiently disable it when no more dependents
+        // depend on it.
+        auto dependants = m_dependants[dependencyName];
+
+        if (enable) {
+            dependants.append(mod.name);
+        }
+        else {
+            dependants.removeAll(mod.name);
+
+            // if there are no longer any dependents, let's disable the mod
+            if (dependencyMod.effectively_hidden && dependants.isEmpty()) {
+                setMod(dependencyMod, dependencyIndex, false, shouldEmit);
+            }
+        }
+    }
+
+    // disable mods that depend on this one, if disabling
+    if (!enable) {
+        auto dependants = m_dependants[mod.name];
+        for (const auto& dependencyName : dependants) {
+            auto dependencyIndex = m_index[dependencyName];
+            auto dependencyMod = m_mods.at(dependencyIndex);
+
+            setMod(dependencyMod, dependencyIndex, false, shouldEmit);
+        }
+    }
+
+    if (shouldEmit) {
+        emit dataChanged(AtlOptionalModListModel::index(index, EnabledColumn),
+                         AtlOptionalModListModel::index(index, EnabledColumn));
+    }
+}
+
+
+AtlOptionalModDialog::AtlOptionalModDialog(QWidget *parent, QVector<ATLauncher::VersionMod> mods)
+    : QDialog(parent), ui(new Ui::AtlOptionalModDialog) {
+    ui->setupUi(this);
+
+    listModel = new AtlOptionalModListModel(this, mods);
+    ui->treeView->setModel(listModel);
+
+    ui->treeView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    ui->treeView->header()->setSectionResizeMode(
+            AtlOptionalModListModel::NameColumn, QHeaderView::ResizeToContents);
+    ui->treeView->header()->setSectionResizeMode(
+            AtlOptionalModListModel::DescriptionColumn, QHeaderView::Stretch);
+
+    connect(ui->selectRecommendedButton, &QPushButton::pressed,
+            listModel, &AtlOptionalModListModel::selectRecommended);
+    connect(ui->clearAllButton, &QPushButton::pressed,
+            listModel, &AtlOptionalModListModel::clearAll);
+    connect(ui->installButton, &QPushButton::pressed,
+            this, &QDialog::close);
+}
+
+AtlOptionalModDialog::~AtlOptionalModDialog() {
+    delete ui;
+}

launcher/ui/pages/modplatform/atlauncher/AtlOptionalModDialog.h

@@ -0,0 +1,66 @@
+#pragma once
+
+#include <QDialog>
+#include <QAbstractListModel>
+
+#include "modplatform/atlauncher/ATLPackIndex.h"
+
+namespace Ui {
+class AtlOptionalModDialog;
+}
+
+class AtlOptionalModListModel : public QAbstractListModel {
+    Q_OBJECT
+
+public:
+    enum Columns
+    {
+        EnabledColumn = 0,
+        NameColumn,
+        DescriptionColumn,
+    };
+
+    AtlOptionalModListModel(QWidget *parent, QVector<ATLauncher::VersionMod> mods);
+
+    QVector<QString> getResult();
+
+    int rowCount(const QModelIndex &parent) const override;
+    int columnCount(const QModelIndex &parent) const override;
+
+    QVariant data(const QModelIndex &index, int role) const override;
+    bool setData(const QModelIndex &index, const QVariant &value, int role) override;
+    QVariant headerData(int section, Qt::Orientation orientation, int role) const override;
+
+    Qt::ItemFlags flags(const QModelIndex &index) const override;
+
+public slots:
+    void selectRecommended();
+    void clearAll();
+
+private:
+    void toggleMod(ATLauncher::VersionMod mod, int index);
+    void setMod(ATLauncher::VersionMod mod, int index, bool enable, bool shouldEmit = true);
+
+private:
+    QVector<ATLauncher::VersionMod> m_mods;
+    QMap<QString, bool> m_selection;
+    QMap<QString, int> m_index;
+    QMap<QString, QVector<QString>> m_dependants;
+};
+
+class AtlOptionalModDialog : public QDialog {
+    Q_OBJECT
+
+public:
+    AtlOptionalModDialog(QWidget *parent, QVector<ATLauncher::VersionMod> mods);
+    ~AtlOptionalModDialog() override;
+
+    QVector<QString> getResult() {
+        return listModel->getResult();
+    }
+
+private:
+    Ui::AtlOptionalModDialog *ui;
+
+    AtlOptionalModListModel *listModel;
+};

launcher/ui/pages/modplatform/atlauncher/AtlOptionalModDialog.ui

@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>AtlOptionalModDialog</class>
+ <widget class="QDialog" name="AtlOptionalModDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>550</width>
+    <height>310</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Select Mods To Install</string>
+  </property>
+  <layout class="QGridLayout" name="gridLayout_2">
+   <item row="1" column="3">
+    <widget class="QPushButton" name="installButton">
+     <property name="text">
+      <string>Install</string>
+     </property>
+     <property name="default">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="1">
+    <widget class="QPushButton" name="selectRecommendedButton">
+     <property name="text">
+      <string>Select Recommended</string>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="0">
+    <widget class="QPushButton" name="shareCodeButton">
+     <property name="enabled">
+      <bool>false</bool>
+     </property>
+     <property name="text">
+      <string>Use Share Code</string>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="2">
+    <widget class="QPushButton" name="clearAllButton">
+     <property name="text">
+      <string>Clear All</string>
+     </property>
+    </widget>
+   </item>
+   <item row="0" column="0" colspan="4">
+    <widget class="ModListView" name="treeView"/>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>ModListView</class>
+   <extends>QTreeView</extends>
+   <header>ui/widgets/ModListView.h</header>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/modplatform/atlauncher/AtlPage.cpp

@@ -0,0 +1,171 @@
+#include "AtlPage.h"
+#include "ui_AtlPage.h"
+
+#include "modplatform/atlauncher/ATLPackInstallTask.h"
+
+#include "AtlOptionalModDialog.h"
+#include "ui/dialogs/NewInstanceDialog.h"
+#include "ui/dialogs/VersionSelectDialog.h"
+
+#include <BuildConfig.h>
+
+AtlPage::AtlPage(NewInstanceDialog* dialog, QWidget *parent)
+        : QWidget(parent), ui(new Ui::AtlPage), dialog(dialog)
+{
+    ui->setupUi(this);
+
+    filterModel = new Atl::FilterModel(this);
+    listModel = new Atl::ListModel(this);
+    filterModel->setSourceModel(listModel);
+    ui->packView->setModel(filterModel);
+    ui->packView->setSortingEnabled(true);
+
+    ui->packView->header()->hide();
+    ui->packView->setIndentation(0);
+
+    ui->versionSelectionBox->view()->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    ui->versionSelectionBox->view()->parentWidget()->setMaximumHeight(300);
+
+    for(int i = 0; i < filterModel->getAvailableSortings().size(); i++)
+    {
+        ui->sortByBox->addItem(filterModel->getAvailableSortings().keys().at(i));
+    }
+    ui->sortByBox->setCurrentText(filterModel->translateCurrentSorting());
+
+    connect(ui->searchEdit, &QLineEdit::textChanged, this, &AtlPage::triggerSearch);
+    connect(ui->sortByBox, &QComboBox::currentTextChanged, this, &AtlPage::onSortingSelectionChanged);
+    connect(ui->packView->selectionModel(), &QItemSelectionModel::currentChanged, this, &AtlPage::onSelectionChanged);
+    connect(ui->versionSelectionBox, &QComboBox::currentTextChanged, this, &AtlPage::onVersionSelectionChanged);
+}
+
+AtlPage::~AtlPage()
+{
+    delete ui;
+}
+
+bool AtlPage::shouldDisplay() const
+{
+    return true;
+}
+
+void AtlPage::openedImpl()
+{
+    if(!initialized)
+    {
+        listModel->request();
+        initialized = true;
+    }
+
+    suggestCurrent();
+}
+
+void AtlPage::suggestCurrent()
+{
+    if(!isOpened)
+    {
+        return;
+    }
+
+    if (selectedVersion.isEmpty())
+    {
+        dialog->setSuggestedPack();
+        return;
+    }
+
+    dialog->setSuggestedPack(selected.name + " " + selectedVersion, new ATLauncher::PackInstallTask(this, selected.safeName, selectedVersion));
+    auto editedLogoName = selected.safeName;
+    auto url = QString(BuildConfig.ATL_DOWNLOAD_SERVER_URL + "launcher/images/%1.png").arg(selected.safeName.toLower());
+    listModel->getLogo(selected.safeName, url, [this, editedLogoName](QString logo)
+    {
+        dialog->setSuggestedIconFromFile(logo, editedLogoName);
+    });
+}
+
+void AtlPage::triggerSearch()
+{
+    filterModel->setSearchTerm(ui->searchEdit->text());
+}
+
+void AtlPage::onSortingSelectionChanged(QString data)
+{
+    auto toSet = filterModel->getAvailableSortings().value(data);
+    filterModel->setSorting(toSet);
+}
+
+void AtlPage::onSelectionChanged(QModelIndex first, QModelIndex second)
+{
+    ui->versionSelectionBox->clear();
+
+    if(!first.isValid())
+    {
+        if(isOpened)
+        {
+            dialog->setSuggestedPack();
+        }
+        return;
+    }
+
+    selected = filterModel->data(first, Qt::UserRole).value<ATLauncher::IndexedPack>();
+
+    ui->packDescription->setHtml(selected.description.replace("\n", "<br>"));
+
+    for(const auto& version : selected.versions) {
+        ui->versionSelectionBox->addItem(version.version);
+    }
+
+    suggestCurrent();
+}
+
+void AtlPage::onVersionSelectionChanged(QString data)
+{
+    if(data.isNull() || data.isEmpty())
+    {
+        selectedVersion = "";
+        return;
+    }
+
+    selectedVersion = data;
+    suggestCurrent();
+}
+
+QVector<QString> AtlPage::chooseOptionalMods(QVector<ATLauncher::VersionMod> mods) {
+    AtlOptionalModDialog optionalModDialog(this, mods);
+    optionalModDialog.exec();
+    return optionalModDialog.getResult();
+}
+
+QString AtlPage::chooseVersion(Meta::VersionListPtr vlist, QString minecraftVersion) {
+    VersionSelectDialog vselect(vlist.get(), "Choose Version", APPLICATION->activeWindow(), false);
+    if (minecraftVersion != Q_NULLPTR) {
+        vselect.setExactFilter(BaseVersionList::ParentVersionRole, minecraftVersion);
+        vselect.setEmptyString(tr("No versions are currently available for Minecraft %1").arg(minecraftVersion));
+    }
+    else {
+        vselect.setEmptyString(tr("No versions are currently available"));
+    }
+    vselect.setEmptyErrorString(tr("Couldn't load or download the version lists!"));
+
+    // select recommended build
+    for (int i = 0; i < vlist->versions().size(); i++) {
+        auto version = vlist->versions().at(i);
+        auto reqs = version->requires();
+
+        // filter by minecraft version, if the loader depends on a certain version.
+        if (minecraftVersion != Q_NULLPTR) {
+            auto iter = std::find_if(reqs.begin(), reqs.end(), [](const Meta::Require &req) {
+                return req.uid == "net.minecraft";
+            });
+            if (iter == reqs.end()) continue;
+            if (iter->equalsVersion != minecraftVersion) continue;
+        }
+
+        // first recommended build we find, we use.
+        if (version->isRecommended()) {
+            vselect.setCurrentVersion(version->descriptor());
+            break;
+        }
+    }
+
+    vselect.exec();
+    return vselect.selectedVersion()->descriptor();
+}

launcher/ui/pages/modplatform/atlauncher/AtlPage.h

@@ -0,0 +1,86 @@
+/* Copyright 2013-2019 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "AtlFilterModel.h"
+#include "AtlListModel.h"
+
+#include <QWidget>
+#include <modplatform/atlauncher/ATLPackInstallTask.h>
+
+#include "Application.h"
+#include "ui/pages/BasePage.h"
+#include "tasks/Task.h"
+
+namespace Ui
+{
+    class AtlPage;
+}
+
+class NewInstanceDialog;
+
+class AtlPage : public QWidget, public BasePage, public ATLauncher::UserInteractionSupport
+{
+Q_OBJECT
+
+public:
+    explicit AtlPage(NewInstanceDialog* dialog, QWidget *parent = 0);
+    virtual ~AtlPage();
+    virtual QString displayName() const override
+    {
+        return tr("ATLauncher");
+    }
+    virtual QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("atlauncher");
+    }
+    virtual QString id() const override
+    {
+        return "atl";
+    }
+    virtual QString helpPage() const override
+    {
+        return "ATL-platform";
+    }
+    virtual bool shouldDisplay() const override;
+
+    void openedImpl() override;
+
+private:
+    void suggestCurrent();
+
+    QString chooseVersion(Meta::VersionListPtr vlist, QString minecraftVersion) override;
+    QVector<QString> chooseOptionalMods(QVector<ATLauncher::VersionMod> mods) override;
+
+private slots:
+    void triggerSearch();
+
+    void onSortingSelectionChanged(QString data);
+
+    void onSelectionChanged(QModelIndex first, QModelIndex second);
+    void onVersionSelectionChanged(QString data);
+
+private:
+    Ui::AtlPage *ui = nullptr;
+    NewInstanceDialog* dialog = nullptr;
+    Atl::ListModel* listModel = nullptr;
+    Atl::FilterModel* filterModel = nullptr;
+
+    ATLauncher::IndexedPack selected;
+    QString selectedVersion;
+
+    bool initialized = false;
+};

launcher/ui/pages/modplatform/atlauncher/AtlPage.ui

@@ -0,0 +1,92 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>AtlPage</class>
+ <widget class="QWidget" name="AtlPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>837</width>
+    <height>685</height>
+   </rect>
+  </property>
+  <layout class="QGridLayout" name="gridLayout">
+   <item row="1" column="0" colspan="2">
+    <layout class="QGridLayout" name="gridLayout_3">
+     <item row="1" column="0">
+      <widget class="QTreeView" name="packView">
+       <property name="alternatingRowColors">
+        <bool>true</bool>
+       </property>
+       <property name="iconSize">
+        <size>
+         <width>96</width>
+         <height>48</height>
+        </size>
+       </property>
+      </widget>
+     </item>
+     <item row="1" column="1">
+      <widget class="QTextBrowser" name="packDescription">
+       <property name="openExternalLinks">
+        <bool>true</bool>
+       </property>
+       <property name="openLinks">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="0" colspan="2">
+      <widget class="QLabel" name="label_2">
+       <property name="text">
+        <string>Warning: This is still a work in progress. If you run into issues with the imported modpack, it may be a bug.</string>
+       </property>
+       <property name="wordWrap">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item row="2" column="0" colspan="2">
+    <layout class="QGridLayout" name="gridLayout_4" columnstretch="0,0,0" rowminimumheight="0" columnminimumwidth="0,0,0">
+     <item row="0" column="2">
+      <widget class="QComboBox" name="versionSelectionBox"/>
+     </item>
+     <item row="0" column="1">
+      <widget class="QLabel" name="label">
+       <property name="text">
+        <string>Version selected:</string>
+       </property>
+       <property name="alignment">
+        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="0">
+      <widget class="QComboBox" name="sortByBox"/>
+     </item>
+    </layout>
+   </item>
+   <item row="0" column="0">
+    <widget class="QLineEdit" name="searchEdit">
+     <property name="placeholderText">
+      <string>Search and filter ...</string>
+     </property>
+     <property name="clearButtonEnabled">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <tabstops>
+  <tabstop>searchEdit</tabstop>
+  <tabstop>packView</tabstop>
+  <tabstop>packDescription</tabstop>
+  <tabstop>sortByBox</tabstop>
+  <tabstop>versionSelectionBox</tabstop>
+ </tabstops>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/modplatform/flame/FlameModel.cpp

@@ -0,0 +1,258 @@
+#include "FlameModel.h"
+#include "Application.h"
+#include <Json.h>
+
+#include <MMCStrings.h>
+#include <Version.h>
+
+#include <QtMath>
+#include <QLabel>
+
+#include <RWStorage.h>
+
+namespace Flame {
+
+ListModel::ListModel(QObject *parent) : QAbstractListModel(parent)
+{
+}
+
+ListModel::~ListModel()
+{
+}
+
+int ListModel::rowCount(const QModelIndex &parent) const
+{
+    return modpacks.size();
+}
+
+int ListModel::columnCount(const QModelIndex &parent) const
+{
+    return 1;
+}
+
+QVariant ListModel::data(const QModelIndex &index, int role) const
+{
+    int pos = index.row();
+    if(pos >= modpacks.size() || pos < 0 || !index.isValid())
+    {
+        return QString("INVALID INDEX %1").arg(pos);
+    }
+
+    IndexedPack pack = modpacks.at(pos);
+    if(role == Qt::DisplayRole)
+    {
+        return pack.name;
+    }
+    else if (role == Qt::ToolTipRole)
+    {
+        if(pack.description.length() > 100)
+        {
+            //some magic to prevent to long tooltips and replace html linebreaks
+            QString edit = pack.description.left(97);
+            edit = edit.left(edit.lastIndexOf("<br>")).left(edit.lastIndexOf(" ")).append("...");
+            return edit;
+
+        }
+        return pack.description;
+    }
+    else if(role == Qt::DecorationRole)
+    {
+        if(m_logoMap.contains(pack.logoName))
+        {
+            return (m_logoMap.value(pack.logoName));
+        }
+        QIcon icon = APPLICATION->getThemedIcon("screenshot-placeholder");
+        ((ListModel *)this)->requestLogo(pack.logoName, pack.logoUrl);
+        return icon;
+    }
+    else if(role == Qt::UserRole)
+    {
+        QVariant v;
+        v.setValue(pack);
+        return v;
+    }
+
+    return QVariant();
+}
+
+void ListModel::logoLoaded(QString logo, QIcon out)
+{
+    m_loadingLogos.removeAll(logo);
+    m_logoMap.insert(logo, out);
+    for(int i = 0; i < modpacks.size(); i++) {
+        if(modpacks[i].logoName == logo) {
+            emit dataChanged(createIndex(i, 0), createIndex(i, 0), {Qt::DecorationRole});
+        }
+    }
+}
+
+void ListModel::logoFailed(QString logo)
+{
+    m_failedLogos.append(logo);
+    m_loadingLogos.removeAll(logo);
+}
+
+void ListModel::requestLogo(QString logo, QString url)
+{
+    if(m_loadingLogos.contains(logo) || m_failedLogos.contains(logo))
+    {
+        return;
+    }
+
+    MetaEntryPtr entry = APPLICATION->metacache()->resolveEntry("FlamePacks", QString("logos/%1").arg(logo.section(".", 0, 0)));
+    NetJob *job = new NetJob(QString("Flame Icon Download %1").arg(logo));
+    job->addNetAction(Net::Download::makeCached(QUrl(url), entry));
+
+    auto fullPath = entry->getFullPath();
+    QObject::connect(job, &NetJob::succeeded, this, [this, logo, fullPath]
+    {
+        emit logoLoaded(logo, QIcon(fullPath));
+        if(waitingCallbacks.contains(logo))
+        {
+            waitingCallbacks.value(logo)(fullPath);
+        }
+    });
+
+    QObject::connect(job, &NetJob::failed, this, [this, logo]
+    {
+        emit logoFailed(logo);
+    });
+
+    job->start(APPLICATION->network());
+
+    m_loadingLogos.append(logo);
+}
+
+void ListModel::getLogo(const QString &logo, const QString &logoUrl, LogoCallback callback)
+{
+    if(m_logoMap.contains(logo))
+    {
+        callback(APPLICATION->metacache()->resolveEntry("FlamePacks", QString("logos/%1").arg(logo.section(".", 0, 0)))->getFullPath());
+    }
+    else
+    {
+        requestLogo(logo, logoUrl);
+    }
+}
+
+Qt::ItemFlags ListModel::flags(const QModelIndex &index) const
+{
+    return QAbstractListModel::flags(index);
+}
+
+bool ListModel::canFetchMore(const QModelIndex& parent) const
+{
+    return searchState == CanPossiblyFetchMore;
+}
+
+void ListModel::fetchMore(const QModelIndex& parent)
+{
+    if (parent.isValid())
+        return;
+    if(nextSearchOffset == 0) {
+        qWarning() << "fetchMore with 0 offset is wrong...";
+        return;
+    }
+    performPaginatedSearch();
+}
+
+void ListModel::performPaginatedSearch()
+{
+    NetJob *netJob = new NetJob("Flame::Search");
+    auto searchUrl = QString(
+        "https://addons-ecs.forgesvc.net/api/v2/addon/search?"
+        "categoryId=0&"
+        "gameId=432&"
+        "index=%1&"
+        "pageSize=25&"
+        "searchFilter=%2&"
+        "sectionId=4471&"
+        "sort=%3"
+    ).arg(nextSearchOffset).arg(currentSearchTerm).arg(currentSort);
+    netJob->addNetAction(Net::Download::makeByteArray(QUrl(searchUrl), &response));
+    jobPtr = netJob;
+    jobPtr->start(APPLICATION->network());
+    QObject::connect(netJob, &NetJob::succeeded, this, &ListModel::searchRequestFinished);
+    QObject::connect(netJob, &NetJob::failed, this, &ListModel::searchRequestFailed);
+}
+
+void ListModel::searchWithTerm(const QString& term, int sort)
+{
+    if(currentSearchTerm == term && currentSearchTerm.isNull() == term.isNull() && currentSort == sort) {
+        return;
+    }
+    currentSearchTerm = term;
+    currentSort = sort;
+    if(jobPtr) {
+        jobPtr->abort();
+        searchState = ResetRequested;
+        return;
+    }
+    else {
+        beginResetModel();
+        modpacks.clear();
+        endResetModel();
+        searchState = None;
+    }
+    nextSearchOffset = 0;
+    performPaginatedSearch();
+}
+
+void Flame::ListModel::searchRequestFinished()
+{
+    jobPtr.reset();
+
+    QJsonParseError parse_error;
+    QJsonDocument doc = QJsonDocument::fromJson(response, &parse_error);
+    if(parse_error.error != QJsonParseError::NoError) {
+        qWarning() << "Error while parsing JSON response from CurseForge at " << parse_error.offset << " reason: " << parse_error.errorString();
+        qWarning() << response;
+        return;
+    }
+
+    QList<Flame::IndexedPack> newList;
+    auto packs = doc.array();
+    for(auto packRaw : packs) {
+        auto packObj = packRaw.toObject();
+
+        Flame::IndexedPack pack;
+        try
+        {
+            Flame::loadIndexedPack(pack, packObj);
+            newList.append(pack);
+        }
+        catch(const JSONValidationError &e)
+        {
+            qWarning() << "Error while loading pack from CurseForge: " << e.cause();
+            continue;
+        }
+    }
+    if(packs.size() < 25) {
+        searchState = Finished;
+    } else {
+        nextSearchOffset += 25;
+        searchState = CanPossiblyFetchMore;
+    }
+    beginInsertRows(QModelIndex(), modpacks.size(), modpacks.size() + newList.size() - 1);
+    modpacks.append(newList);
+    endInsertRows();
+}
+
+void Flame::ListModel::searchRequestFailed(QString reason)
+{
+    jobPtr.reset();
+
+    if(searchState == ResetRequested) {
+        beginResetModel();
+        modpacks.clear();
+        endResetModel();
+
+        nextSearchOffset = 0;
+        performPaginatedSearch();
+    } else {
+        searchState = Finished;
+    }
+}
+
+}
+

launcher/ui/pages/modplatform/flame/FlameModel.h

@@ -0,0 +1,76 @@
+#pragma once
+
+#include <RWStorage.h>
+
+#include <QAbstractListModel>
+#include <QSortFilterProxyModel>
+#include <QThreadPool>
+#include <QIcon>
+#include <QStyledItemDelegate>
+#include <QList>
+#include <QString>
+#include <QStringList>
+#include <QMetaType>
+
+#include <functional>
+#include <net/NetJob.h>
+
+#include <modplatform/flame/FlamePackIndex.h>
+
+namespace Flame {
+
+
+typedef QMap<QString, QIcon> LogoMap;
+typedef std::function<void(QString)> LogoCallback;
+
+class ListModel : public QAbstractListModel
+{
+    Q_OBJECT
+
+public:
+    ListModel(QObject *parent);
+    virtual ~ListModel();
+
+    int rowCount(const QModelIndex &parent) const override;
+    int columnCount(const QModelIndex &parent) const override;
+    QVariant data(const QModelIndex &index, int role) const override;
+    Qt::ItemFlags flags(const QModelIndex &index) const override;
+    bool canFetchMore(const QModelIndex & parent) const override;
+    void fetchMore(const QModelIndex & parent) override;
+
+    void getLogo(const QString &logo, const QString &logoUrl, LogoCallback callback);
+    void searchWithTerm(const QString & term, const int sort);
+
+private slots:
+    void performPaginatedSearch();
+
+    void logoFailed(QString logo);
+    void logoLoaded(QString logo, QIcon out);
+
+    void searchRequestFinished();
+    void searchRequestFailed(QString reason);
+
+private:
+    void requestLogo(QString file, QString url);
+
+private:
+    QList<IndexedPack> modpacks;
+    QStringList m_failedLogos;
+    QStringList m_loadingLogos;
+    LogoMap m_logoMap;
+    QMap<QString, LogoCallback> waitingCallbacks;
+
+    QString currentSearchTerm;
+    int currentSort = 0;
+    int nextSearchOffset = 0;
+    enum SearchState {
+        None,
+        CanPossiblyFetchMore,
+        ResetRequested,
+        Finished
+    } searchState = None;
+    NetJob::Ptr jobPtr;
+    QByteArray response;
+};
+
+}

launcher/ui/pages/modplatform/flame/FlamePage.cpp

@@ -0,0 +1,186 @@
+#include "FlamePage.h"
+#include "ui_FlamePage.h"
+
+#include <QKeyEvent>
+
+#include "Application.h"
+#include "Json.h"
+#include "ui/dialogs/NewInstanceDialog.h"
+#include "InstanceImportTask.h"
+#include "FlameModel.h"
+
+FlamePage::FlamePage(NewInstanceDialog* dialog, QWidget *parent)
+    : QWidget(parent), ui(new Ui::FlamePage), dialog(dialog)
+{
+    ui->setupUi(this);
+    connect(ui->searchButton, &QPushButton::clicked, this, &FlamePage::triggerSearch);
+    ui->searchEdit->installEventFilter(this);
+    listModel = new Flame::ListModel(this);
+    ui->packView->setModel(listModel);
+
+    ui->versionSelectionBox->view()->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    ui->versionSelectionBox->view()->parentWidget()->setMaximumHeight(300);
+
+    // index is used to set the sorting with the curseforge api
+    ui->sortByBox->addItem(tr("Sort by featured"));
+    ui->sortByBox->addItem(tr("Sort by popularity"));
+    ui->sortByBox->addItem(tr("Sort by last updated"));
+    ui->sortByBox->addItem(tr("Sort by name"));
+    ui->sortByBox->addItem(tr("Sort by author"));
+    ui->sortByBox->addItem(tr("Sort by total downloads"));
+
+    connect(ui->sortByBox, SIGNAL(currentIndexChanged(int)), this, SLOT(triggerSearch()));
+    connect(ui->packView->selectionModel(), &QItemSelectionModel::currentChanged, this, &FlamePage::onSelectionChanged);
+    connect(ui->versionSelectionBox, &QComboBox::currentTextChanged, this, &FlamePage::onVersionSelectionChanged);
+}
+
+FlamePage::~FlamePage()
+{
+    delete ui;
+}
+
+bool FlamePage::eventFilter(QObject* watched, QEvent* event)
+{
+    if (watched == ui->searchEdit && event->type() == QEvent::KeyPress) {
+        QKeyEvent* keyEvent = static_cast<QKeyEvent*>(event);
+        if (keyEvent->key() == Qt::Key_Return) {
+            triggerSearch();
+            keyEvent->accept();
+            return true;
+        }
+    }
+    return QWidget::eventFilter(watched, event);
+}
+
+bool FlamePage::shouldDisplay() const
+{
+    return true;
+}
+
+void FlamePage::openedImpl()
+{
+    suggestCurrent();
+    triggerSearch();
+}
+
+void FlamePage::triggerSearch()
+{
+    listModel->searchWithTerm(ui->searchEdit->text(), ui->sortByBox->currentIndex());
+}
+
+void FlamePage::onSelectionChanged(QModelIndex first, QModelIndex second)
+{
+    ui->versionSelectionBox->clear();
+
+    if(!first.isValid())
+    {
+        if(isOpened)
+        {
+            dialog->setSuggestedPack();
+        }
+        return;
+    }
+
+    current = listModel->data(first, Qt::UserRole).value<Flame::IndexedPack>();
+    QString text = "";
+    QString name = current.name;
+
+    if (current.websiteUrl.isEmpty())
+        text = name;
+    else
+        text = "<a href=\"" + current.websiteUrl + "\">" + name + "</a>";
+    if (!current.authors.empty()) {
+        auto authorToStr = [](Flame::ModpackAuthor & author) {
+            if(author.url.isEmpty()) {
+                return author.name;
+            }
+            return QString("<a href=\"%1\">%2</a>").arg(author.url, author.name);
+        };
+        QStringList authorStrs;
+        for(auto & author: current.authors) {
+            authorStrs.push_back(authorToStr(author));
+        }
+        text += "<br>" + tr(" by ") + authorStrs.join(", ");
+    }
+    text += "<br><br>";
+
+    ui->packDescription->setHtml(text + current.description);
+
+    if (current.versionsLoaded == false)
+    {
+        qDebug() << "Loading flame modpack versions";
+        NetJob *netJob = new NetJob(QString("Flame::PackVersions(%1)").arg(current.name));
+        std::shared_ptr<QByteArray> response = std::make_shared<QByteArray>();
+        int addonId = current.addonId;
+        netJob->addNetAction(Net::Download::makeByteArray(QString("https://addons-ecs.forgesvc.net/api/v2/addon/%1/files").arg(addonId), response.get()));
+
+        QObject::connect(netJob, &NetJob::succeeded, this, [this, response]
+        {
+            QJsonParseError parse_error;
+            QJsonDocument doc = QJsonDocument::fromJson(*response, &parse_error);
+            if(parse_error.error != QJsonParseError::NoError) {
+                qWarning() << "Error while parsing JSON response from CurseForge at " << parse_error.offset << " reason: " << parse_error.errorString();
+                qWarning() << *response;
+                return;
+            }
+            QJsonArray arr = doc.array();
+            try
+            {
+                Flame::loadIndexedPackVersions(current, arr);
+            }
+            catch(const JSONValidationError &e)
+            {
+                qDebug() << *response;
+                qWarning() << "Error while reading flame modpack version: " << e.cause();
+            }
+
+            for(auto version : current.versions) {
+                ui->versionSelectionBox->addItem(version.version, QVariant(version.downloadUrl));
+            }
+
+            suggestCurrent();
+        });
+        netJob->start(APPLICATION->network());
+    }
+    else
+    {
+        for(auto version : current.versions) {
+            ui->versionSelectionBox->addItem(version.version, QVariant(version.downloadUrl));
+        }
+
+        suggestCurrent();
+    }
+}
+
+void FlamePage::suggestCurrent()
+{
+    if(!isOpened)
+    {
+        return;
+    }
+
+    if (selectedVersion.isEmpty())
+    {
+        dialog->setSuggestedPack();
+        return;
+    }
+
+    dialog->setSuggestedPack(current.name, new InstanceImportTask(selectedVersion));
+    QString editedLogoName;
+    editedLogoName = "curseforge_" + current.logoName.section(".", 0, 0);
+    listModel->getLogo(current.logoName, current.logoUrl, [this, editedLogoName](QString logo)
+    {
+        dialog->setSuggestedIconFromFile(logo, editedLogoName);
+    });
+}
+
+void FlamePage::onVersionSelectionChanged(QString data)
+{
+    if(data.isNull() || data.isEmpty())
+    {
+        selectedVersion = "";
+        return;
+    }
+    selectedVersion = ui->versionSelectionBox->currentData().toString();
+    suggestCurrent();
+}

launcher/ui/pages/modplatform/flame/FlamePage.h

@@ -0,0 +1,80 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QWidget>
+
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+#include "tasks/Task.h"
+#include <modplatform/flame/FlamePackIndex.h>
+
+namespace Ui
+{
+class FlamePage;
+}
+
+class NewInstanceDialog;
+
+namespace Flame {
+    class ListModel;
+}
+
+class FlamePage : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit FlamePage(NewInstanceDialog* dialog, QWidget *parent = 0);
+    virtual ~FlamePage();
+    virtual QString displayName() const override
+    {
+        return tr("CurseForge");
+    }
+    virtual QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("flame");
+    }
+    virtual QString id() const override
+    {
+        return "flame";
+    }
+    virtual QString helpPage() const override
+    {
+        return "Flame-platform";
+    }
+    virtual bool shouldDisplay() const override;
+
+    void openedImpl() override;
+
+    bool eventFilter(QObject * watched, QEvent * event) override;
+
+private:
+    void suggestCurrent();
+
+private slots:
+    void triggerSearch();
+    void onSelectionChanged(QModelIndex first, QModelIndex second);
+    void onVersionSelectionChanged(QString data);
+
+private:
+    Ui::FlamePage *ui = nullptr;
+    NewInstanceDialog* dialog = nullptr;
+    Flame::ListModel* listModel = nullptr;
+    Flame::IndexedPack current;
+
+    QString selectedVersion;
+};

launcher/ui/pages/modplatform/flame/FlamePage.ui

@@ -0,0 +1,90 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+  <class>FlamePage</class>
+  <widget class="QWidget" name="FlamePage">
+    <property name="geometry">
+      <rect>
+        <x>0</x>
+        <y>0</y>
+        <width>837</width>
+        <height>685</height>
+      </rect>
+    </property>
+    <layout class="QGridLayout" name="gridLayout">
+      <item row="1" column="0" colspan="2">
+        <layout class="QGridLayout" name="gridLayout_3">
+          <item row="1" column="0">
+            <widget class="QListView" name="packView">
+              <property name="iconSize">
+                <size>
+                  <width>48</width>
+                  <height>48</height>
+                </size>
+              </property>
+              <property name="horizontalScrollBarPolicy">
+                <enum>Qt::ScrollBarAlwaysOff</enum>
+              </property>
+              <property name="alternatingRowColors">
+                <bool>true</bool>
+              </property>
+            </widget>
+          </item>
+          <item row="1" column="1">
+            <widget class="QTextBrowser" name="packDescription">
+              <property name="openExternalLinks">
+                <bool>true</bool>
+              </property>
+              <property name="openLinks">
+                <bool>true</bool>
+              </property>
+            </widget>
+          </item>
+        </layout>
+      </item>
+      <item row="2" column="0" colspan="2">
+        <layout class="QGridLayout" name="gridLayout_4" columnstretch="0,0,0" rowminimumheight="0" columnminimumwidth="0,0,0">
+          <item row="0" column="2">
+            <widget class="QComboBox" name="versionSelectionBox"/>
+          </item>
+          <item row="0" column="1">
+            <widget class="QLabel" name="label">
+              <property name="text">
+                <string>Version selected:</string>
+              </property>
+              <property name="alignment">
+                <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+              </property>
+            </widget>
+          </item>
+          <item row="0" column="0">
+            <widget class="QComboBox" name="sortByBox"/>
+          </item>
+        </layout>
+      </item>
+      <item row="0" column="1">
+        <widget class="QPushButton" name="searchButton">
+          <property name="text">
+            <string>Search</string>
+          </property>
+        </widget>
+      </item>
+      <item row="0" column="0">
+        <widget class="QLineEdit" name="searchEdit">
+          <property name="placeholderText">
+            <string>Search and filter ...</string>
+          </property>
+        </widget>
+      </item>
+    </layout>
+  </widget>
+  <tabstops>
+    <tabstop>searchEdit</tabstop>
+    <tabstop>searchButton</tabstop>
+    <tabstop>packView</tabstop>
+    <tabstop>packDescription</tabstop>
+    <tabstop>sortByBox</tabstop>
+    <tabstop>versionSelectionBox</tabstop>
+  </tabstops>
+  <resources/>
+  <connections/>
+</ui>

launcher/ui/pages/modplatform/ftb/FtbFilterModel.cpp

@@ -0,0 +1,76 @@
+#include "FtbFilterModel.h"
+
+#include <QDebug>
+
+#include "modplatform/modpacksch/FTBPackManifest.h"
+#include <MMCStrings.h>
+
+namespace Ftb {
+
+FilterModel::FilterModel(QObject *parent) : QSortFilterProxyModel(parent)
+{
+    currentSorting = Sorting::ByPlays;
+    sortings.insert(tr("Sort by plays"), Sorting::ByPlays);
+    sortings.insert(tr("Sort by installs"), Sorting::ByInstalls);
+    sortings.insert(tr("Sort by name"), Sorting::ByName);
+}
+
+const QMap<QString, FilterModel::Sorting> FilterModel::getAvailableSortings()
+{
+    return sortings;
+}
+
+QString FilterModel::translateCurrentSorting()
+{
+    return sortings.key(currentSorting);
+}
+
+void FilterModel::setSorting(Sorting sorting)
+{
+    currentSorting = sorting;
+    invalidate();
+}
+
+FilterModel::Sorting FilterModel::getCurrentSorting()
+{
+    return currentSorting;
+}
+
+void FilterModel::setSearchTerm(const QString& term)
+{
+    searchTerm = term.trimmed();
+    invalidate();
+}
+
+bool FilterModel::filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const
+{
+    if (searchTerm.isEmpty()) {
+        return true;
+    }
+
+    auto index = sourceModel()->index(sourceRow, 0, sourceParent);
+    auto pack = sourceModel()->data(index, Qt::UserRole).value<ModpacksCH::Modpack>();
+    return pack.name.contains(searchTerm, Qt::CaseInsensitive);
+}
+
+bool FilterModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
+{
+    ModpacksCH::Modpack leftPack = sourceModel()->data(left, Qt::UserRole).value<ModpacksCH::Modpack>();
+    ModpacksCH::Modpack rightPack = sourceModel()->data(right, Qt::UserRole).value<ModpacksCH::Modpack>();
+
+    if (currentSorting == ByPlays) {
+        return leftPack.plays < rightPack.plays;
+    }
+    else if (currentSorting == ByInstalls) {
+        return leftPack.installs < rightPack.installs;
+    }
+    else if (currentSorting == ByName) {
+        return Strings::naturalCompare(leftPack.name, rightPack.name, Qt::CaseSensitive) >= 0;
+    }
+
+    // Invalid sorting set, somehow...
+    qWarning() << "Invalid sorting set!";
+    return true;
+}
+
+}

launcher/ui/pages/modplatform/ftb/FtbFilterModel.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <QtCore/QSortFilterProxyModel>
+
+namespace Ftb {
+
+class FilterModel : public QSortFilterProxyModel
+{
+    Q_OBJECT
+
+public:
+    FilterModel(QObject* parent = Q_NULLPTR);
+    enum Sorting {
+        ByPlays,
+        ByInstalls,
+        ByName,
+    };
+    const QMap<QString, Sorting> getAvailableSortings();
+    QString translateCurrentSorting();
+    void setSorting(Sorting sorting);
+    Sorting getCurrentSorting();
+    void setSearchTerm(const QString& term);
+
+protected:
+    bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const override;
+    bool lessThan(const QModelIndex &left, const QModelIndex &right) const override;
+
+private:
+    QMap<QString, Sorting> sortings;
+    Sorting currentSorting;
+    QString searchTerm { "" };
+
+};
+
+}

launcher/ui/pages/modplatform/ftb/FtbListModel.cpp

@@ -0,0 +1,278 @@
+#include "FtbListModel.h"
+
+#include "BuildConfig.h"
+#include "Application.h"
+#include "Json.h"
+
+#include <QPainter>
+
+namespace Ftb {
+
+ListModel::ListModel(QObject *parent) : QAbstractListModel(parent)
+{
+}
+
+ListModel::~ListModel()
+{
+}
+
+int ListModel::rowCount(const QModelIndex &parent) const
+{
+    return modpacks.size();
+}
+
+int ListModel::columnCount(const QModelIndex &parent) const
+{
+    return 1;
+}
+
+QVariant ListModel::data(const QModelIndex &index, int role) const
+{
+    int pos = index.row();
+    if(pos >= modpacks.size() || pos < 0 || !index.isValid())
+    {
+        return QString("INVALID INDEX %1").arg(pos);
+    }
+
+    ModpacksCH::Modpack pack = modpacks.at(pos);
+    if(role == Qt::DisplayRole)
+    {
+        return pack.name;
+    }
+    else if (role == Qt::ToolTipRole)
+    {
+        return pack.synopsis;
+    }
+    else if(role == Qt::DecorationRole)
+    {
+        QIcon placeholder = APPLICATION->getThemedIcon("screenshot-placeholder");
+
+        auto iter = m_logoMap.find(pack.name);
+        if (iter != m_logoMap.end()) {
+            auto & logo = *iter;
+            if(!logo.result.isNull()) {
+                return logo.result;
+            }
+            return placeholder;
+        }
+
+        for(auto art : pack.art) {
+            if(art.type == "square") {
+                ((ListModel *)this)->requestLogo(pack.name, art.url);
+            }
+        }
+        return placeholder;
+    }
+    else if(role == Qt::UserRole)
+    {
+        QVariant v;
+        v.setValue(pack);
+        return v;
+    }
+
+    return QVariant();
+}
+
+void ListModel::getLogo(const QString &logo, const QString &logoUrl, LogoCallback callback)
+{
+    if(m_logoMap.contains(logo))
+    {
+        callback(APPLICATION->metacache()->resolveEntry("ModpacksCHPacks", QString("logos/%1").arg(logo.section(".", 0, 0)))->getFullPath());
+    }
+    else
+    {
+        requestLogo(logo, logoUrl);
+    }
+}
+
+void ListModel::request()
+{
+    beginResetModel();
+    modpacks.clear();
+    endResetModel();
+
+    auto *netJob = new NetJob("Ftb::Request");
+    auto url = QString(BuildConfig.MODPACKSCH_API_BASE_URL + "public/modpack/all");
+    netJob->addNetAction(Net::Download::makeByteArray(QUrl(url), &response));
+    jobPtr = netJob;
+    jobPtr->start(APPLICATION->network());
+
+    QObject::connect(netJob, &NetJob::succeeded, this, &ListModel::requestFinished);
+    QObject::connect(netJob, &NetJob::failed, this, &ListModel::requestFailed);
+}
+
+void ListModel::requestFinished()
+{
+    jobPtr.reset();
+    remainingPacks.clear();
+
+    QJsonParseError parse_error;
+    QJsonDocument doc = QJsonDocument::fromJson(response, &parse_error);
+    if(parse_error.error != QJsonParseError::NoError) {
+        qWarning() << "Error while parsing JSON response from FTB at " << parse_error.offset << " reason: " << parse_error.errorString();
+        qWarning() << response;
+        return;
+    }
+
+    auto packs = doc.object().value("packs").toArray();
+    for(auto pack : packs) {
+        auto packId = pack.toInt();
+        remainingPacks.append(packId);
+    }
+
+    if(!remainingPacks.isEmpty()) {
+        currentPack = remainingPacks.at(0);
+        requestPack();
+    }
+}
+
+void ListModel::requestFailed(QString reason)
+{
+    jobPtr.reset();
+    remainingPacks.clear();
+}
+
+void ListModel::requestPack()
+{
+    auto *netJob = new NetJob("Ftb::Search");
+    auto searchUrl = QString(BuildConfig.MODPACKSCH_API_BASE_URL + "public/modpack/%1")
+            .arg(currentPack);
+    netJob->addNetAction(Net::Download::makeByteArray(QUrl(searchUrl), &response));
+    jobPtr = netJob;
+    jobPtr->start(APPLICATION->network());
+
+    QObject::connect(netJob, &NetJob::succeeded, this, &ListModel::packRequestFinished);
+    QObject::connect(netJob, &NetJob::failed, this, &ListModel::packRequestFailed);
+}
+
+void ListModel::packRequestFinished()
+{
+    jobPtr.reset();
+    remainingPacks.removeOne(currentPack);
+
+    QJsonParseError parse_error;
+    QJsonDocument doc = QJsonDocument::fromJson(response, &parse_error);
+
+    if(parse_error.error != QJsonParseError::NoError) {
+        qWarning() << "Error while parsing JSON response from FTB at " << parse_error.offset << " reason: " << parse_error.errorString();
+        qWarning() << response;
+        return;
+    }
+
+    auto obj = doc.object();
+
+    ModpacksCH::Modpack pack;
+    try
+    {
+        ModpacksCH::loadModpack(pack, obj);
+    }
+    catch (const JSONValidationError &e)
+    {
+        qDebug() << QString::fromUtf8(response);
+        qWarning() << "Error while reading pack manifest from FTB: " << e.cause();
+        return;
+    }
+
+    // Since there is no guarantee that packs have a version, this will just
+    // ignore those "dud" packs.
+    if (pack.versions.empty())
+    {
+        qWarning() << "FTB Pack " << pack.id << " ignored. reason: lacking any versions";
+    }
+    else
+    {
+        beginInsertRows(QModelIndex(), modpacks.size(), modpacks.size());
+        modpacks.append(pack);
+        endInsertRows();
+    }
+
+    if(!remainingPacks.isEmpty()) {
+        currentPack = remainingPacks.at(0);
+        requestPack();
+    }
+}
+
+void ListModel::packRequestFailed(QString reason)
+{
+    jobPtr.reset();
+    remainingPacks.removeOne(currentPack);
+}
+
+void ListModel::logoLoaded(QString logo, bool stale)
+{
+    auto & logoObj = m_logoMap[logo];
+    logoObj.downloadJob.reset();
+    QString smallPath = logoObj.fullpath + ".small";
+
+    QFileInfo smallInfo(smallPath);
+
+    if(stale || !smallInfo.exists()) {
+        QImage image(logoObj.fullpath);
+        if (image.isNull())
+        {
+            logoObj.failed = true;
+            return;
+        }
+        QImage small;
+        if (image.width() > image.height()) {
+            small = image.scaledToWidth(512).scaledToWidth(256, Qt::SmoothTransformation);
+        }
+        else {
+            small = image.scaledToHeight(512).scaledToHeight(256, Qt::SmoothTransformation);
+        }
+        QPoint offset((256 - small.width()) / 2, (256 - small.height()) / 2);
+        QImage square(QSize(256, 256), QImage::Format_ARGB32);
+        square.fill(Qt::transparent);
+
+        QPainter painter(&square);
+        painter.drawImage(offset, small);
+        painter.end();
+
+        square.save(logoObj.fullpath + ".small", "PNG");
+    }
+
+    logoObj.result = QIcon(logoObj.fullpath + ".small");
+    for(int i = 0; i < modpacks.size(); i++) {
+        if(modpacks[i].name == logo) {
+            emit dataChanged(createIndex(i, 0), createIndex(i, 0), {Qt::DecorationRole});
+        }
+    }
+}
+
+void ListModel::logoFailed(QString logo)
+{
+    m_logoMap[logo].failed = true;
+    m_logoMap[logo].downloadJob.reset();
+}
+
+void ListModel::requestLogo(QString logo, QString url)
+{
+    if(m_logoMap.contains(logo)) {
+        return;
+    }
+
+    MetaEntryPtr entry = APPLICATION->metacache()->resolveEntry("ModpacksCHPacks", QString("logos/%1").arg(logo.section(".", 0, 0)));
+
+    bool stale = entry->isStale();
+
+    NetJob *job = new NetJob(QString("FTB Icon Download %1").arg(logo));
+    job->addNetAction(Net::Download::makeCached(QUrl(url), entry));
+
+    auto fullPath = entry->getFullPath();
+    QObject::connect(job, &NetJob::finished, this, [this, logo, fullPath, stale]
+    {
+        logoLoaded(logo, stale);
+    });
+
+    QObject::connect(job, &NetJob::failed, this, [this, logo]
+    {
+        logoFailed(logo);
+    });
+
+    auto &newLogoEntry = m_logoMap[logo];
+    newLogoEntry.downloadJob = job;
+    newLogoEntry.fullpath = fullPath;
+    job->start(APPLICATION->network());
+}
+
+}

launcher/ui/pages/modplatform/ftb/FtbListModel.h

@@ -0,0 +1,61 @@
+#pragma once
+
+#include <QAbstractListModel>
+
+#include "modplatform/modpacksch/FTBPackManifest.h"
+#include "net/NetJob.h"
+#include <QIcon>
+
+namespace Ftb {
+
+struct Logo {
+    QString fullpath;
+    NetJob::Ptr downloadJob;
+    QIcon result;
+    bool failed = false;
+};
+
+typedef QMap<QString, Logo> LogoMap;
+typedef std::function<void(QString)> LogoCallback;
+
+class ListModel : public QAbstractListModel
+{
+    Q_OBJECT
+
+public:
+    ListModel(QObject *parent);
+    virtual ~ListModel();
+
+    int rowCount(const QModelIndex &parent) const override;
+    int columnCount(const QModelIndex &parent) const override;
+    QVariant data(const QModelIndex &index, int role) const override;
+
+    void request();
+
+    void getLogo(const QString &logo, const QString &logoUrl, LogoCallback callback);
+
+private slots:
+    void requestFinished();
+    void requestFailed(QString reason);
+
+    void requestPack();
+    void packRequestFinished();
+    void packRequestFailed(QString reason);
+
+    void logoFailed(QString logo);
+    void logoLoaded(QString logo, bool stale);
+
+private:
+    void requestLogo(QString file, QString url);
+
+private:
+    QList<ModpacksCH::Modpack> modpacks;
+    LogoMap m_logoMap;
+
+    NetJob::Ptr jobPtr;
+    int currentPack;
+    QList<int> remainingPacks;
+    QByteArray response;
+};
+
+}

launcher/ui/pages/modplatform/ftb/FtbPage.cpp

@@ -0,0 +1,150 @@
+#include "FtbPage.h"
+#include "ui_FtbPage.h"
+
+#include <QKeyEvent>
+
+#include "ui/dialogs/NewInstanceDialog.h"
+#include "modplatform/modpacksch/FTBPackInstallTask.h"
+
+#include "HoeDown.h"
+
+FtbPage::FtbPage(NewInstanceDialog* dialog, QWidget *parent)
+        : QWidget(parent), ui(new Ui::FtbPage), dialog(dialog)
+{
+    ui->setupUi(this);
+
+    filterModel = new Ftb::FilterModel(this);
+    listModel = new Ftb::ListModel(this);
+    filterModel->setSourceModel(listModel);
+    ui->packView->setModel(filterModel);
+    ui->packView->setSortingEnabled(true);
+    ui->packView->header()->hide();
+    ui->packView->setIndentation(0);
+
+    ui->searchEdit->installEventFilter(this);
+
+    ui->versionSelectionBox->view()->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    ui->versionSelectionBox->view()->parentWidget()->setMaximumHeight(300);
+
+    for(int i = 0; i < filterModel->getAvailableSortings().size(); i++)
+    {
+        ui->sortByBox->addItem(filterModel->getAvailableSortings().keys().at(i));
+    }
+    ui->sortByBox->setCurrentText(filterModel->translateCurrentSorting());
+
+    connect(ui->searchEdit, &QLineEdit::textChanged, this, &FtbPage::triggerSearch);
+    connect(ui->sortByBox, &QComboBox::currentTextChanged, this, &FtbPage::onSortingSelectionChanged);
+    connect(ui->packView->selectionModel(), &QItemSelectionModel::currentChanged, this, &FtbPage::onSelectionChanged);
+    connect(ui->versionSelectionBox, &QComboBox::currentTextChanged, this, &FtbPage::onVersionSelectionChanged);
+}
+
+FtbPage::~FtbPage()
+{
+    delete ui;
+}
+
+bool FtbPage::eventFilter(QObject* watched, QEvent* event)
+{
+    if (watched == ui->searchEdit && event->type() == QEvent::KeyPress) {
+        QKeyEvent* keyEvent = static_cast<QKeyEvent*>(event);
+        if (keyEvent->key() == Qt::Key_Return) {
+            triggerSearch();
+            keyEvent->accept();
+            return true;
+        }
+    }
+    return QWidget::eventFilter(watched, event);
+}
+
+bool FtbPage::shouldDisplay() const
+{
+    return true;
+}
+
+void FtbPage::openedImpl()
+{
+    if(!initialised)
+    {
+        listModel->request();
+        initialised = true;
+    }
+
+    suggestCurrent();
+}
+
+void FtbPage::suggestCurrent()
+{
+    if(!isOpened)
+    {
+        return;
+    }
+
+    if (selectedVersion.isEmpty())
+    {
+        dialog->setSuggestedPack();
+        return;
+    }
+
+    dialog->setSuggestedPack(selected.name + " " + selectedVersion, new ModpacksCH::PackInstallTask(selected, selectedVersion));
+    for(auto art : selected.art) {
+        if(art.type == "square") {
+            QString editedLogoName;
+            editedLogoName = selected.name;
+
+            listModel->getLogo(selected.name, art.url, [this, editedLogoName](QString logo)
+            {
+                dialog->setSuggestedIconFromFile(logo + ".small", editedLogoName);
+            });
+        }
+    }
+}
+
+void FtbPage::triggerSearch()
+{
+    filterModel->setSearchTerm(ui->searchEdit->text());
+}
+
+void FtbPage::onSortingSelectionChanged(QString data)
+{
+    auto toSet = filterModel->getAvailableSortings().value(data);
+    filterModel->setSorting(toSet);
+}
+
+void FtbPage::onSelectionChanged(QModelIndex first, QModelIndex second)
+{
+    ui->versionSelectionBox->clear();
+
+    if(!first.isValid())
+    {
+        if(isOpened)
+        {
+            dialog->setSuggestedPack();
+        }
+        return;
+    }
+
+    selected = filterModel->data(first, Qt::UserRole).value<ModpacksCH::Modpack>();
+
+    HoeDown hoedown;
+    QString output = hoedown.process(selected.description.toUtf8());
+    ui->packDescription->setHtml(output);
+
+    // reverse foreach, so that the newest versions are first
+    for (auto i = selected.versions.size(); i--;) {
+        ui->versionSelectionBox->addItem(selected.versions.at(i).name);
+    }
+
+    suggestCurrent();
+}
+
+void FtbPage::onVersionSelectionChanged(QString data)
+{
+    if(data.isNull() || data.isEmpty())
+    {
+        selectedVersion = "";
+        return;
+    }
+
+    selectedVersion = data;
+    suggestCurrent();
+}

launcher/ui/pages/modplatform/ftb/FtbPage.h

@@ -0,0 +1,83 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "FtbFilterModel.h"
+#include "FtbListModel.h"
+
+#include <QWidget>
+
+#include "Application.h"
+#include "ui/pages/BasePage.h"
+#include "tasks/Task.h"
+
+namespace Ui
+{
+    class FtbPage;
+}
+
+class NewInstanceDialog;
+
+class FtbPage : public QWidget, public BasePage
+{
+Q_OBJECT
+
+public:
+    explicit FtbPage(NewInstanceDialog* dialog, QWidget *parent = 0);
+    virtual ~FtbPage();
+    virtual QString displayName() const override
+    {
+        return tr("FTB");
+    }
+    virtual QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("ftb_logo");
+    }
+    virtual QString id() const override
+    {
+        return "ftb";
+    }
+    virtual QString helpPage() const override
+    {
+        return "FTB-platform";
+    }
+    virtual bool shouldDisplay() const override;
+
+    void openedImpl() override;
+
+    bool eventFilter(QObject * watched, QEvent * event) override;
+
+private:
+    void suggestCurrent();
+
+private slots:
+    void triggerSearch();
+
+    void onSortingSelectionChanged(QString data);
+    void onSelectionChanged(QModelIndex first, QModelIndex second);
+    void onVersionSelectionChanged(QString data);
+
+private:
+    Ui::FtbPage *ui = nullptr;
+    NewInstanceDialog* dialog = nullptr;
+    Ftb::ListModel* listModel = nullptr;
+    Ftb::FilterModel* filterModel = nullptr;
+
+    ModpacksCH::Modpack selected;
+    QString selectedVersion;
+
+    bool initialised { false };
+};

launcher/ui/pages/modplatform/ftb/FtbPage.ui

@@ -0,0 +1,79 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>FtbPage</class>
+ <widget class="QWidget" name="FtbPage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>875</width>
+    <height>745</height>
+   </rect>
+  </property>
+  <layout class="QGridLayout" name="gridLayout">
+   <item row="2" column="0" colspan="2">
+    <layout class="QGridLayout" name="gridLayout_4" columnstretch="0,0,0" rowminimumheight="0" columnminimumwidth="0,0,0">
+     <item row="0" column="2">
+      <widget class="QComboBox" name="versionSelectionBox"/>
+     </item>
+     <item row="0" column="1">
+      <widget class="QLabel" name="label">
+       <property name="text">
+        <string>Version selected:</string>
+       </property>
+       <property name="alignment">
+        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="0">
+      <widget class="QComboBox" name="sortByBox"/>
+     </item>
+    </layout>
+   </item>
+   <item row="0" column="0">
+    <widget class="QLineEdit" name="searchEdit">
+     <property name="placeholderText">
+      <string>Search and filter ...</string>
+     </property>
+     <property name="clearButtonEnabled">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="0" colspan="2">
+    <layout class="QGridLayout" name="gridLayout_3">
+     <item row="0" column="0">
+      <widget class="QTreeView" name="packView">
+       <property name="alternatingRowColors">
+        <bool>true</bool>
+       </property>
+       <property name="iconSize">
+        <size>
+         <width>48</width>
+         <height>48</height>
+        </size>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="1">
+      <widget class="QTextBrowser" name="packDescription">
+       <property name="openExternalLinks">
+        <bool>true</bool>
+       </property>
+       <property name="openLinks">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+  </layout>
+ </widget>
+ <tabstops>
+  <tabstop>searchEdit</tabstop>
+  <tabstop>versionSelectionBox</tabstop>
+ </tabstops>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/modplatform/legacy_ftb/ListModel.cpp

@@ -0,0 +1,259 @@
+#include "ListModel.h"
+#include "Application.h"
+
+#include <MMCStrings.h>
+#include <Version.h>
+
+#include <QtMath>
+#include <QLabel>
+
+#include <RWStorage.h>
+
+#include <BuildConfig.h>
+
+namespace LegacyFTB {
+
+FilterModel::FilterModel(QObject *parent) : QSortFilterProxyModel(parent)
+{
+    currentSorting = Sorting::ByGameVersion;
+    sortings.insert(tr("Sort by name"), Sorting::ByName);
+    sortings.insert(tr("Sort by game version"), Sorting::ByGameVersion);
+}
+
+bool FilterModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
+{
+    Modpack leftPack = sourceModel()->data(left, Qt::UserRole).value<Modpack>();
+    Modpack rightPack = sourceModel()->data(right, Qt::UserRole).value<Modpack>();
+
+    if(currentSorting == Sorting::ByGameVersion) {
+        Version lv(leftPack.mcVersion);
+        Version rv(rightPack.mcVersion);
+        return lv < rv;
+
+    } else if(currentSorting == Sorting::ByName) {
+        return Strings::naturalCompare(leftPack.name, rightPack.name, Qt::CaseSensitive) >= 0;
+    }
+
+    //UHM, some inavlid value set?!
+    qWarning() << "Invalid sorting set!";
+    return true;
+}
+
+bool FilterModel::filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const
+{
+    return true;
+}
+
+const QMap<QString, FilterModel::Sorting> FilterModel::getAvailableSortings()
+{
+    return sortings;
+}
+
+QString FilterModel::translateCurrentSorting()
+{
+    return sortings.key(currentSorting);
+}
+
+void FilterModel::setSorting(Sorting s)
+{
+    currentSorting = s;
+    invalidate();
+}
+
+FilterModel::Sorting FilterModel::getCurrentSorting()
+{
+    return currentSorting;
+}
+
+ListModel::ListModel(QObject *parent) : QAbstractListModel(parent)
+{
+}
+
+ListModel::~ListModel()
+{
+}
+
+QString ListModel::translatePackType(PackType type) const
+{
+    switch(type)
+    {
+        case PackType::Public:
+            return tr("Public Modpack");
+        case PackType::ThirdParty:
+            return tr("Third Party Modpack");
+        case PackType::Private:
+            return tr("Private Modpack");
+    }
+    qWarning() << "Unknown FTB modpack type:" << int(type);
+    return QString();
+}
+
+int ListModel::rowCount(const QModelIndex &parent) const
+{
+    return modpacks.size();
+}
+
+int ListModel::columnCount(const QModelIndex &parent) const
+{
+    return 1;
+}
+
+QVariant ListModel::data(const QModelIndex &index, int role) const
+{
+    int pos = index.row();
+    if(pos >= modpacks.size() || pos < 0 || !index.isValid())
+    {
+        return QString("INVALID INDEX %1").arg(pos);
+    }
+
+    Modpack pack = modpacks.at(pos);
+    if(role == Qt::DisplayRole)
+    {
+        return pack.name + "\n" + translatePackType(pack.type);
+    }
+    else if (role == Qt::ToolTipRole)
+    {
+        if(pack.description.length() > 100)
+        {
+            //some magic to prevent to long tooltips and replace html linebreaks
+            QString edit = pack.description.left(97);
+            edit = edit.left(edit.lastIndexOf("<br>")).left(edit.lastIndexOf(" ")).append("...");
+            return edit;
+
+        }
+        return pack.description;
+    }
+    else if(role == Qt::DecorationRole)
+    {
+        if(m_logoMap.contains(pack.logo))
+        {
+            return (m_logoMap.value(pack.logo));
+        }
+        QIcon icon = APPLICATION->getThemedIcon("screenshot-placeholder");
+        ((ListModel *)this)->requestLogo(pack.logo);
+        return icon;
+    }
+    else if(role == Qt::TextColorRole)
+    {
+        if(pack.broken)
+        {
+            //FIXME: Hardcoded color
+            return QColor(255, 0, 50);
+        }
+        else if(pack.bugged)
+        {
+            //FIXME: Hardcoded color
+            //bugged pack, currently only indicates bugged xml
+            return QColor(244, 229, 66);
+        }
+    }
+    else if(role == Qt::UserRole)
+    {
+        QVariant v;
+        v.setValue(pack);
+        return v;
+    }
+
+    return QVariant();
+}
+
+void ListModel::fill(ModpackList modpacks)
+{
+    beginResetModel();
+    this->modpacks = modpacks;
+    endResetModel();
+}
+
+void ListModel::addPack(Modpack modpack)
+{
+    beginResetModel();
+    this->modpacks.append(modpack);
+    endResetModel();
+}
+
+void ListModel::clear()
+{
+    beginResetModel();
+    modpacks.clear();
+    endResetModel();
+}
+
+Modpack ListModel::at(int row)
+{
+    return modpacks.at(row);
+}
+
+void ListModel::remove(int row)
+{
+    if(row < 0 || row >= modpacks.size())
+    {
+        qWarning() << "Attempt to remove FTB modpacks with invalid row" << row;
+        return;
+    }
+    beginRemoveRows(QModelIndex(), row, row);
+    modpacks.removeAt(row);
+    endRemoveRows();
+}
+
+void ListModel::logoLoaded(QString logo, QIcon out)
+{
+    m_loadingLogos.removeAll(logo);
+    m_logoMap.insert(logo, out);
+    emit dataChanged(createIndex(0, 0), createIndex(1, 0));
+}
+
+void ListModel::logoFailed(QString logo)
+{
+    m_failedLogos.append(logo);
+    m_loadingLogos.removeAll(logo);
+}
+
+void ListModel::requestLogo(QString file)
+{
+    if(m_loadingLogos.contains(file) || m_failedLogos.contains(file))
+    {
+        return;
+    }
+
+    MetaEntryPtr entry = APPLICATION->metacache()->resolveEntry("FTBPacks", QString("logos/%1").arg(file.section(".", 0, 0)));
+    NetJob *job = new NetJob(QString("FTB Icon Download for %1").arg(file));
+    job->addNetAction(Net::Download::makeCached(QUrl(QString(BuildConfig.LEGACY_FTB_CDN_BASE_URL + "static/%1").arg(file)), entry));
+
+    auto fullPath = entry->getFullPath();
+    QObject::connect(job, &NetJob::finished, this, [this, file, fullPath]
+    {
+        emit logoLoaded(file, QIcon(fullPath));
+        if(waitingCallbacks.contains(file))
+        {
+            waitingCallbacks.value(file)(fullPath);
+        }
+    });
+
+    QObject::connect(job, &NetJob::failed, this, [this, file]
+    {
+        emit logoFailed(file);
+    });
+
+    job->start(APPLICATION->network());
+
+    m_loadingLogos.append(file);
+}
+
+void ListModel::getLogo(const QString &logo, LogoCallback callback)
+{
+    if(m_logoMap.contains(logo))
+    {
+        callback(APPLICATION->metacache()->resolveEntry("FTBPacks", QString("logos/%1").arg(logo.section(".", 0, 0)))->getFullPath());
+    }
+    else
+    {
+        requestLogo(logo);
+    }
+}
+
+Qt::ItemFlags ListModel::flags(const QModelIndex &index) const
+{
+    return QAbstractListModel::flags(index);
+}
+
+}

launcher/ui/pages/modplatform/legacy_ftb/ListModel.h

@@ -0,0 +1,78 @@
+#pragma once
+
+#include <modplatform/legacy_ftb/PackHelpers.h>
+#include <RWStorage.h>
+
+#include <QAbstractListModel>
+#include <QSortFilterProxyModel>
+#include <QThreadPool>
+#include <QIcon>
+#include <QStyledItemDelegate>
+
+#include <functional>
+
+namespace LegacyFTB {
+
+typedef QMap<QString, QIcon> FTBLogoMap;
+typedef std::function<void(QString)> LogoCallback;
+
+class FilterModel : public QSortFilterProxyModel
+{
+    Q_OBJECT
+public:
+    FilterModel(QObject* parent = Q_NULLPTR);
+    enum Sorting {
+        ByName,
+        ByGameVersion
+    };
+    const QMap<QString, Sorting> getAvailableSortings();
+    QString translateCurrentSorting();
+    void setSorting(Sorting sorting);
+    Sorting getCurrentSorting();
+
+protected:
+    bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const override;
+    bool lessThan(const QModelIndex &left, const QModelIndex &right) const override;
+
+private:
+    QMap<QString, Sorting> sortings;
+    Sorting currentSorting;
+
+};
+
+class ListModel : public QAbstractListModel
+{
+    Q_OBJECT
+private:
+    ModpackList modpacks;
+    QStringList m_failedLogos;
+    QStringList m_loadingLogos;
+    FTBLogoMap m_logoMap;
+    QMap<QString, LogoCallback> waitingCallbacks;
+
+    void requestLogo(QString file);
+    QString translatePackType(PackType type) const;
+
+
+private slots:
+    void logoFailed(QString logo);
+    void logoLoaded(QString logo, QIcon out);
+
+public:
+    ListModel(QObject *parent);
+    ~ListModel();
+    int rowCount(const QModelIndex &parent) const override;
+    int columnCount(const QModelIndex &parent) const override;
+    QVariant data(const QModelIndex &index, int role) const override;
+    Qt::ItemFlags flags(const QModelIndex &index) const override;
+
+    void fill(ModpackList modpacks);
+    void addPack(Modpack modpack);
+    void clear();
+    void remove(int row);
+
+    Modpack at(int row);
+    void getLogo(const QString &logo, LogoCallback callback);
+};
+
+}

launcher/ui/pages/modplatform/legacy_ftb/Page.cpp

@@ -0,0 +1,371 @@
+#include "Page.h"
+#include "ui_Page.h"
+
+#include <QInputDialog>
+
+#include "Application.h"
+
+#include "ui/dialogs/CustomMessageBox.h"
+#include "ui/dialogs/NewInstanceDialog.h"
+
+#include "modplatform/legacy_ftb/PackFetchTask.h"
+#include "modplatform/legacy_ftb/PackInstallTask.h"
+#include "modplatform/legacy_ftb/PrivatePackManager.h"
+#include "ListModel.h"
+
+namespace LegacyFTB {
+
+Page::Page(NewInstanceDialog* dialog, QWidget *parent)
+    : QWidget(parent), dialog(dialog), ui(new Ui::Page)
+{
+    ftbFetchTask.reset(new PackFetchTask(APPLICATION->network()));
+    ftbPrivatePacks.reset(new PrivatePackManager());
+
+    ui->setupUi(this);
+
+    {
+        publicFilterModel = new FilterModel(this);
+        publicListModel = new ListModel(this);
+        publicFilterModel->setSourceModel(publicListModel);
+
+        ui->publicPackList->setModel(publicFilterModel);
+        ui->publicPackList->setSortingEnabled(true);
+        ui->publicPackList->header()->hide();
+        ui->publicPackList->setIndentation(0);
+        ui->publicPackList->setIconSize(QSize(42, 42));
+
+        for(int i = 0; i < publicFilterModel->getAvailableSortings().size(); i++)
+        {
+            ui->sortByBox->addItem(publicFilterModel->getAvailableSortings().keys().at(i));
+        }
+
+        ui->sortByBox->setCurrentText(publicFilterModel->translateCurrentSorting());
+    }
+
+    {
+        thirdPartyFilterModel = new FilterModel(this);
+        thirdPartyModel = new ListModel(this);
+        thirdPartyFilterModel->setSourceModel(thirdPartyModel);
+
+        ui->thirdPartyPackList->setModel(thirdPartyFilterModel);
+        ui->thirdPartyPackList->setSortingEnabled(true);
+        ui->thirdPartyPackList->header()->hide();
+        ui->thirdPartyPackList->setIndentation(0);
+        ui->thirdPartyPackList->setIconSize(QSize(42, 42));
+
+        thirdPartyFilterModel->setSorting(publicFilterModel->getCurrentSorting());
+    }
+
+    {
+        privateFilterModel = new FilterModel(this);
+        privateListModel = new ListModel(this);
+        privateFilterModel->setSourceModel(privateListModel);
+
+        ui->privatePackList->setModel(privateFilterModel);
+        ui->privatePackList->setSortingEnabled(true);
+        ui->privatePackList->header()->hide();
+        ui->privatePackList->setIndentation(0);
+        ui->privatePackList->setIconSize(QSize(42, 42));
+
+        privateFilterModel->setSorting(publicFilterModel->getCurrentSorting());
+    }
+
+    ui->versionSelectionBox->view()->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    ui->versionSelectionBox->view()->parentWidget()->setMaximumHeight(300);
+
+    connect(ui->sortByBox, &QComboBox::currentTextChanged, this, &Page::onSortingSelectionChanged);
+    connect(ui->versionSelectionBox, &QComboBox::currentTextChanged, this, &Page::onVersionSelectionItemChanged);
+
+    connect(ui->publicPackList->selectionModel(), &QItemSelectionModel::currentChanged, this, &Page::onPublicPackSelectionChanged);
+    connect(ui->thirdPartyPackList->selectionModel(), &QItemSelectionModel::currentChanged, this, &Page::onThirdPartyPackSelectionChanged);
+    connect(ui->privatePackList->selectionModel(), &QItemSelectionModel::currentChanged, this, &Page::onPrivatePackSelectionChanged);
+
+    connect(ui->addPackBtn, &QPushButton::pressed, this, &Page::onAddPackClicked);
+    connect(ui->removePackBtn, &QPushButton::pressed, this, &Page::onRemovePackClicked);
+
+    connect(ui->tabWidget, &QTabWidget::currentChanged, this, &Page::onTabChanged);
+
+    // ui->modpackInfo->setOpenExternalLinks(true);
+
+    ui->publicPackList->selectionModel()->reset();
+    ui->thirdPartyPackList->selectionModel()->reset();
+    ui->privatePackList->selectionModel()->reset();
+
+    onTabChanged(ui->tabWidget->currentIndex());
+}
+
+Page::~Page()
+{
+    delete ui;
+}
+
+bool Page::shouldDisplay() const
+{
+    return true;
+}
+
+void Page::openedImpl()
+{
+    if(!initialized)
+    {
+        connect(ftbFetchTask.get(), &PackFetchTask::finished, this, &Page::ftbPackDataDownloadSuccessfully);
+        connect(ftbFetchTask.get(), &PackFetchTask::failed, this, &Page::ftbPackDataDownloadFailed);
+
+        connect(ftbFetchTask.get(), &PackFetchTask::privateFileDownloadFinished, this, &Page::ftbPrivatePackDataDownloadSuccessfully);
+        connect(ftbFetchTask.get(), &PackFetchTask::privateFileDownloadFailed, this, &Page::ftbPrivatePackDataDownloadFailed);
+
+        ftbFetchTask->fetch();
+        ftbPrivatePacks->load();
+        ftbFetchTask->fetchPrivate(ftbPrivatePacks->getCurrentPackCodes().toList());
+        initialized = true;
+    }
+    suggestCurrent();
+}
+
+void Page::suggestCurrent()
+{
+    if(!isOpened)
+    {
+        return;
+    }
+
+    if(selected.broken || selectedVersion.isEmpty())
+    {
+        dialog->setSuggestedPack();
+        return;
+    }
+
+    dialog->setSuggestedPack(selected.name, new PackInstallTask(APPLICATION->network(), selected, selectedVersion));
+    QString editedLogoName;
+    if(selected.logo.toLower().startsWith("ftb"))
+    {
+        editedLogoName = selected.logo;
+    }
+    else
+    {
+        editedLogoName = "ftb_" + selected.logo;
+    }
+
+    editedLogoName = editedLogoName.left(editedLogoName.lastIndexOf(".png"));
+
+    if(selected.type == PackType::Public)
+    {
+        publicListModel->getLogo(selected.logo, [this, editedLogoName](QString logo)
+        {
+            dialog->setSuggestedIconFromFile(logo, editedLogoName);
+        });
+    }
+    else if (selected.type == PackType::ThirdParty)
+    {
+        thirdPartyModel->getLogo(selected.logo, [this, editedLogoName](QString logo)
+        {
+            dialog->setSuggestedIconFromFile(logo, editedLogoName);
+        });
+    }
+    else if (selected.type == PackType::Private)
+    {
+        privateListModel->getLogo(selected.logo, [this, editedLogoName](QString logo)
+        {
+            dialog->setSuggestedIconFromFile(logo, editedLogoName);
+        });
+    }
+}
+
+void Page::ftbPackDataDownloadSuccessfully(ModpackList publicPacks, ModpackList thirdPartyPacks)
+{
+    publicListModel->fill(publicPacks);
+    thirdPartyModel->fill(thirdPartyPacks);
+}
+
+void Page::ftbPackDataDownloadFailed(QString reason)
+{
+    //TODO: Display the error
+}
+
+void Page::ftbPrivatePackDataDownloadSuccessfully(Modpack pack)
+{
+    privateListModel->addPack(pack);
+}
+
+void Page::ftbPrivatePackDataDownloadFailed(QString reason, QString packCode)
+{
+    auto reply = QMessageBox::question(
+        this,
+        tr("FTB private packs"),
+        tr("Failed to download pack information for code %1.\nShould it be removed now?").arg(packCode)
+    );
+    if(reply == QMessageBox::Yes)
+    {
+        ftbPrivatePacks->remove(packCode);
+    }
+}
+
+void Page::onPublicPackSelectionChanged(QModelIndex now, QModelIndex prev)
+{
+    if(!now.isValid())
+    {
+        onPackSelectionChanged();
+        return;
+    }
+    Modpack selectedPack = publicFilterModel->data(now, Qt::UserRole).value<Modpack>();
+    onPackSelectionChanged(&selectedPack);
+}
+
+void Page::onThirdPartyPackSelectionChanged(QModelIndex now, QModelIndex prev)
+{
+    if(!now.isValid())
+    {
+        onPackSelectionChanged();
+        return;
+    }
+    Modpack selectedPack = thirdPartyFilterModel->data(now, Qt::UserRole).value<Modpack>();
+    onPackSelectionChanged(&selectedPack);
+}
+
+void Page::onPrivatePackSelectionChanged(QModelIndex now, QModelIndex prev)
+{
+    if(!now.isValid())
+    {
+        onPackSelectionChanged();
+        return;
+    }
+    Modpack selectedPack = privateFilterModel->data(now, Qt::UserRole).value<Modpack>();
+    onPackSelectionChanged(&selectedPack);
+}
+
+void Page::onPackSelectionChanged(Modpack* pack)
+{
+    ui->versionSelectionBox->clear();
+    if(pack)
+    {
+        currentModpackInfo->setHtml("Pack by <b>" + pack->author + "</b>" +
+                                    "<br>Minecraft " + pack->mcVersion + "<br>" + "<br>" + pack->description + "<ul><li>" + pack->mods.replace(";", "</li><li>")
+                                    + "</li></ul>");
+        bool currentAdded = false;
+
+        for(int i = 0; i < pack->oldVersions.size(); i++)
+        {
+            if(pack->currentVersion == pack->oldVersions.at(i))
+            {
+                currentAdded = true;
+            }
+            ui->versionSelectionBox->addItem(pack->oldVersions.at(i));
+        }
+
+        if(!currentAdded)
+        {
+            ui->versionSelectionBox->addItem(pack->currentVersion);
+        }
+        selected = *pack;
+    }
+    else
+    {
+        currentModpackInfo->setHtml("");
+        ui->versionSelectionBox->clear();
+        if(isOpened)
+        {
+            dialog->setSuggestedPack();
+        }
+        return;
+    }
+    suggestCurrent();
+}
+
+void Page::onVersionSelectionItemChanged(QString data)
+{
+    if(data.isNull() || data.isEmpty())
+    {
+        selectedVersion = "";
+        return;
+    }
+
+    selectedVersion = data;
+    suggestCurrent();
+}
+
+void Page::onSortingSelectionChanged(QString data)
+{
+    FilterModel::Sorting toSet = publicFilterModel->getAvailableSortings().value(data);
+    publicFilterModel->setSorting(toSet);
+    thirdPartyFilterModel->setSorting(toSet);
+    privateFilterModel->setSorting(toSet);
+}
+
+void Page::onTabChanged(int tab)
+{
+    if(tab == 1)
+    {
+        currentModel = thirdPartyFilterModel;
+        currentList = ui->thirdPartyPackList;
+        currentModpackInfo = ui->thirdPartyPackDescription;
+    }
+    else if(tab == 2)
+    {
+        currentModel = privateFilterModel;
+        currentList = ui->privatePackList;
+        currentModpackInfo = ui->privatePackDescription;
+    }
+    else
+    {
+        currentModel = publicFilterModel;
+        currentList = ui->publicPackList;
+        currentModpackInfo = ui->publicPackDescription;
+    }
+
+    currentList->selectionModel()->reset();
+    QModelIndex idx = currentList->currentIndex();
+    if(idx.isValid())
+    {
+        auto pack = currentModel->data(idx, Qt::UserRole).value<Modpack>();
+        onPackSelectionChanged(&pack);
+    }
+    else
+    {
+        onPackSelectionChanged();
+    }
+}
+
+void Page::onAddPackClicked()
+{
+    bool ok;
+    QString text = QInputDialog::getText(
+        this,
+        tr("Add FTB pack"),
+        tr("Enter pack code:"),
+        QLineEdit::Normal,
+        QString(),
+        &ok
+    );
+    if(ok && !text.isEmpty())
+    {
+        ftbPrivatePacks->add(text);
+        ftbFetchTask->fetchPrivate({text});
+    }
+}
+
+void Page::onRemovePackClicked()
+{
+    auto index = ui->privatePackList->currentIndex();
+    if(!index.isValid())
+    {
+        return;
+    }
+    auto row = index.row();
+    Modpack pack = privateListModel->at(row);
+    auto answer = QMessageBox::question(
+        this,
+        tr("Remove pack"),
+        tr("Are you sure you want to remove pack %1?").arg(pack.name),
+        QMessageBox::Yes | QMessageBox::No
+    );
+    if(answer != QMessageBox::Yes)
+    {
+        return;
+    }
+
+    ftbPrivatePacks->remove(pack.packCode);
+    privateListModel->remove(row);
+    onPackSelectionChanged();
+}
+
+}

launcher/ui/pages/modplatform/legacy_ftb/Page.h

@@ -0,0 +1,119 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QWidget>
+#include <QTreeView>
+#include <QTextBrowser>
+
+#include "ui/pages/BasePage.h"
+#include <Application.h>
+#include "tasks/Task.h"
+#include "modplatform/legacy_ftb/PackHelpers.h"
+#include "modplatform/legacy_ftb/PackFetchTask.h"
+#include "QObjectPtr.h"
+
+class NewInstanceDialog;
+
+namespace LegacyFTB {
+
+namespace Ui
+{
+class Page;
+}
+
+class ListModel;
+class FilterModel;
+class PrivatePackListModel;
+class PrivatePackFilterModel;
+class PrivatePackManager;
+
+class Page : public QWidget, public BasePage
+{
+    Q_OBJECT
+
+public:
+    explicit Page(NewInstanceDialog * dialog, QWidget *parent = 0);
+    virtual ~Page();
+    QString displayName() const override
+    {
+        return tr("FTB Legacy");
+    }
+    QIcon icon() const override
+    {
+        return APPLICATION->getThemedIcon("ftb_logo");
+    }
+    QString id() const override
+    {
+        return "legacy_ftb";
+    }
+    QString helpPage() const override
+    {
+        return "FTB-platform";
+    }
+    bool shouldDisplay() const override;
+    void openedImpl() override;
+
+private:
+    void suggestCurrent();
+    void onPackSelectionChanged(Modpack *pack = nullptr);
+
+private slots:
+    void ftbPackDataDownloadSuccessfully(ModpackList publicPacks, ModpackList thirdPartyPacks);
+    void ftbPackDataDownloadFailed(QString reason);
+
+    void ftbPrivatePackDataDownloadSuccessfully(Modpack pack);
+    void ftbPrivatePackDataDownloadFailed(QString reason, QString packCode);
+
+    void onSortingSelectionChanged(QString data);
+    void onVersionSelectionItemChanged(QString data);
+
+    void onPublicPackSelectionChanged(QModelIndex first, QModelIndex second);
+    void onThirdPartyPackSelectionChanged(QModelIndex first, QModelIndex second);
+    void onPrivatePackSelectionChanged(QModelIndex first, QModelIndex second);
+
+    void onTabChanged(int tab);
+
+    void onAddPackClicked();
+    void onRemovePackClicked();
+
+private:
+    FilterModel* currentModel = nullptr;
+    QTreeView* currentList = nullptr;
+    QTextBrowser* currentModpackInfo = nullptr;
+
+    bool initialized = false;
+    Modpack selected;
+    QString selectedVersion;
+
+    ListModel* publicListModel = nullptr;
+    FilterModel* publicFilterModel = nullptr;
+
+    ListModel *thirdPartyModel = nullptr;
+    FilterModel *thirdPartyFilterModel = nullptr;
+
+    ListModel *privateListModel = nullptr;
+    FilterModel *privateFilterModel = nullptr;
+
+    unique_qobject_ptr<PackFetchTask> ftbFetchTask;
+    std::unique_ptr<PrivatePackManager> ftbPrivatePacks;
+
+    NewInstanceDialog* dialog = nullptr;
+
+    Ui::Page *ui = nullptr;
+};
+
+}

launcher/ui/pages/modplatform/legacy_ftb/Page.ui

@@ -0,0 +1,135 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>LegacyFTB::Page</class>
+ <widget class="QWidget" name="LegacyFTB::Page">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>709</width>
+    <height>602</height>
+   </rect>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <widget class="QTabWidget" name="tabWidget">
+     <property name="currentIndex">
+      <number>0</number>
+     </property>
+     <widget class="QWidget" name="tab">
+      <attribute name="title">
+       <string>Public</string>
+      </attribute>
+      <layout class="QGridLayout" name="gridLayout">
+       <item row="0" column="0">
+        <widget class="QTreeView" name="publicPackList">
+         <property name="maximumSize">
+          <size>
+           <width>250</width>
+           <height>16777215</height>
+          </size>
+         </property>
+         <property name="alternatingRowColors">
+          <bool>true</bool>
+         </property>
+        </widget>
+       </item>
+       <item row="0" column="1">
+        <widget class="QTextBrowser" name="publicPackDescription"/>
+       </item>
+      </layout>
+     </widget>
+     <widget class="QWidget" name="tab_2">
+      <attribute name="title">
+       <string>3rd Party</string>
+      </attribute>
+      <layout class="QGridLayout" name="gridLayout_3">
+       <item row="0" column="1">
+        <widget class="QTextBrowser" name="thirdPartyPackDescription"/>
+       </item>
+       <item row="0" column="0">
+        <widget class="QTreeView" name="thirdPartyPackList">
+         <property name="maximumSize">
+          <size>
+           <width>250</width>
+           <height>16777215</height>
+          </size>
+         </property>
+         <property name="alternatingRowColors">
+          <bool>true</bool>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+     <widget class="QWidget" name="tab_3">
+      <attribute name="title">
+       <string>Private</string>
+      </attribute>
+      <layout class="QGridLayout" name="gridLayout_2">
+       <item row="0" column="0">
+        <widget class="QTreeView" name="privatePackList">
+         <property name="maximumSize">
+          <size>
+           <width>250</width>
+           <height>16777215</height>
+          </size>
+         </property>
+         <property name="alternatingRowColors">
+          <bool>true</bool>
+         </property>
+        </widget>
+       </item>
+       <item row="1" column="0">
+        <widget class="QPushButton" name="addPackBtn">
+         <property name="text">
+          <string>Add pack</string>
+         </property>
+        </widget>
+       </item>
+       <item row="2" column="0">
+        <widget class="QPushButton" name="removePackBtn">
+         <property name="text">
+          <string>Remove selected pack</string>
+         </property>
+        </widget>
+       </item>
+       <item row="0" column="1" rowspan="3">
+        <widget class="QTextBrowser" name="privatePackDescription"/>
+       </item>
+      </layout>
+     </widget>
+    </widget>
+   </item>
+   <item>
+    <layout class="QGridLayout" name="gridLayout_4">
+     <item row="0" column="1">
+      <widget class="QLabel" name="label">
+       <property name="text">
+        <string>Version selected:</string>
+       </property>
+       <property name="alignment">
+        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="2">
+      <widget class="QComboBox" name="versionSelectionBox"/>
+     </item>
+     <item row="0" column="0">
+      <widget class="QComboBox" name="sortByBox">
+       <property name="minimumSize">
+        <size>
+         <width>265</width>
+         <height>0</height>
+        </size>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

launcher/ui/pages/modplatform/technic/TechnicData.h

@@ -0,0 +1,42 @@
+/* Copyright 2020-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QList>
+#include <QString>
+
+namespace Technic {
+struct Modpack {
+    QString slug;
+
+    QString name;
+    QString logoUrl;
+    QString logoName;
+
+    bool broken = true;
+
+    QString url;
+    bool isSolder = false;
+    QString minecraftVersion;
+
+    bool metadataLoaded = false;
+    QString websiteUrl;
+    QString author;
+    QString description;
+};
+}
+
+Q_DECLARE_METATYPE(Technic::Modpack)

launcher/ui/pages/modplatform/technic/TechnicModel.cpp

@@ -0,0 +1,237 @@
+/* Copyright 2020-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "TechnicModel.h"
+#include "Application.h"
+#include "Json.h"
+
+#include <QIcon>
+
+Technic::ListModel::ListModel(QObject *parent) : QAbstractListModel(parent)
+{
+}
+
+Technic::ListModel::~ListModel()
+{
+}
+
+QVariant Technic::ListModel::data(const QModelIndex& index, int role) const
+{
+    int pos = index.row();
+    if(pos >= modpacks.size() || pos < 0 || !index.isValid())
+    {
+        return QString("INVALID INDEX %1").arg(pos);
+    }
+
+    Modpack pack = modpacks.at(pos);
+    if(role == Qt::DisplayRole)
+    {
+        return pack.name;
+    }
+    else if(role == Qt::DecorationRole)
+    {
+        if(m_logoMap.contains(pack.logoName))
+        {
+            return (m_logoMap.value(pack.logoName));
+        }
+        QIcon icon = APPLICATION->getThemedIcon("screenshot-placeholder");
+        ((ListModel *)this)->requestLogo(pack.logoName, pack.logoUrl);
+        return icon;
+    }
+    else if(role == Qt::UserRole)
+    {
+        QVariant v;
+        v.setValue(pack);
+        return v;
+    }
+    return QVariant();
+}
+
+int Technic::ListModel::columnCount(const QModelIndex&) const
+{
+    return 1;
+}
+
+int Technic::ListModel::rowCount(const QModelIndex&) const
+{
+    return modpacks.size();
+}
+
+void Technic::ListModel::searchWithTerm(const QString& term)
+{
+    if(currentSearchTerm == term && currentSearchTerm.isNull() == term.isNull()) {
+        return;
+    }
+    currentSearchTerm = term;
+    if(jobPtr) {
+        jobPtr->abort();
+        searchState = ResetRequested;
+        return;
+    }
+    else {
+        beginResetModel();
+        modpacks.clear();
+        endResetModel();
+        searchState = None;
+    }
+    performSearch();
+}
+
+void Technic::ListModel::performSearch()
+{
+    NetJob *netJob = new NetJob("Technic::Search");
+    QString searchUrl = "";
+    if (currentSearchTerm.isEmpty()) {
+        searchUrl = "https://api.technicpack.net/trending?build=multimc";
+    }
+    else
+    {
+        searchUrl = QString(
+            "https://api.technicpack.net/search?build=multimc&q=%1"
+        ).arg(currentSearchTerm);
+    }
+    netJob->addNetAction(Net::Download::makeByteArray(QUrl(searchUrl), &response));
+    jobPtr = netJob;
+    jobPtr->start(APPLICATION->network());
+    QObject::connect(netJob, &NetJob::succeeded, this, &ListModel::searchRequestFinished);
+    QObject::connect(netJob, &NetJob::failed, this, &ListModel::searchRequestFailed);
+}
+
+void Technic::ListModel::searchRequestFinished()
+{
+    jobPtr.reset();
+
+    QJsonParseError parse_error;
+    QJsonDocument doc = QJsonDocument::fromJson(response, &parse_error);
+    if(parse_error.error != QJsonParseError::NoError)
+    {
+        qWarning() << "Error while parsing JSON response from Technic at " << parse_error.offset << " reason: " << parse_error.errorString();
+        qWarning() << response;
+        return;
+    }
+
+    QList<Modpack> newList;
+    try {
+        auto root = Json::requireObject(doc);
+        auto objs = Json::requireArray(root, "modpacks");
+        for (auto technicPack: objs) {
+            Modpack pack;
+            auto technicPackObject = Json::requireObject(technicPack);
+            pack.name = Json::requireString(technicPackObject, "name");
+            pack.slug = Json::requireString(technicPackObject, "slug");
+            if (pack.slug == "vanilla")
+                continue;
+
+            auto rawURL = Json::ensureString(technicPackObject, "iconUrl", "null");
+            if(rawURL == "null") {
+                pack.logoUrl = "null";
+                pack.logoName = "null";
+            }
+            else {
+                pack.logoUrl = rawURL;
+                pack.logoName = rawURL.section(QLatin1Char('/'), -1).section(QLatin1Char('.'), 0, 0);
+            }
+            pack.broken = false;
+            newList.append(pack);
+        }
+    }
+    catch (const JSONValidationError &err)
+    {
+        qCritical() << "Couldn't parse technic search results:" << err.cause() ;
+        return;
+    }
+    searchState = Finished;
+    beginInsertRows(QModelIndex(), modpacks.size(), modpacks.size() + newList.size() - 1);
+    modpacks.append(newList);
+    endInsertRows();
+}
+
+void Technic::ListModel::getLogo(const QString& logo, const QString& logoUrl, Technic::LogoCallback callback)
+{
+    if(m_logoMap.contains(logo))
+    {
+        callback(APPLICATION->metacache()->resolveEntry("TechnicPacks", QString("logos/%1").arg(logo))->getFullPath());
+    }
+    else
+    {
+        requestLogo(logo, logoUrl);
+    }
+}
+
+void Technic::ListModel::searchRequestFailed()
+{
+    jobPtr.reset();
+
+    if(searchState == ResetRequested)
+    {
+        beginResetModel();
+        modpacks.clear();
+        endResetModel();
+
+        performSearch();
+    }
+    else
+    {
+        searchState = Finished;
+    }
+}
+
+
+void Technic::ListModel::logoLoaded(QString logo, QString out)
+{
+    m_loadingLogos.removeAll(logo);
+    m_logoMap.insert(logo, QIcon(out));
+    for(int i = 0; i < modpacks.size(); i++)
+    {
+        if(modpacks[i].logoName == logo)
+        {
+            emit dataChanged(createIndex(i, 0), createIndex(i, 0), {Qt::DecorationRole});
+        }
+    }
+}
+
+void Technic::ListModel::logoFailed(QString logo)
+{
+    m_failedLogos.append(logo);
+    m_loadingLogos.removeAll(logo);
+}
+
+void Technic::ListModel::requestLogo(QString logo, QString url)
+{
+    if(m_loadingLogos.contains(logo) || m_failedLogos.contains(logo) || logo == "null")
+    {
+        return;
+    }
+
+    MetaEntryPtr entry = APPLICATION->metacache()->resolveEntry("TechnicPacks", QString("logos/%1").arg(logo));
+    NetJob *job = new NetJob(QString("Technic Icon Download %1").arg(logo));
+    job->addNetAction(Net::Download::makeCached(QUrl(url), entry));
+
+    auto fullPath = entry->getFullPath();
+
+    QObject::connect(job, &NetJob::succeeded, this, [this, logo, fullPath]
+    {
+        logoLoaded(logo, fullPath);
+    });
+
+    QObject::connect(job, &NetJob::failed, this, [this, logo]
+    {
+        logoFailed(logo);
+    });
+
+    job->start(APPLICATION->network());
+
+    m_loadingLogos.append(logo);
+}

launcher/ui/pages/modplatform/technic/TechnicModel.h

@@ -0,0 +1,70 @@
+/* Copyright 2020-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QModelIndex>
+
+#include "TechnicData.h"
+#include "net/NetJob.h"
+
+namespace Technic {
+
+typedef std::function<void(QString)> LogoCallback;
+
+class ListModel : public QAbstractListModel
+{
+    Q_OBJECT
+
+public:
+    ListModel(QObject *parent);
+    virtual ~ListModel();
+
+    virtual QVariant data(const QModelIndex& index, int role) const;
+    virtual int columnCount(const QModelIndex& parent) const;
+    virtual int rowCount(const QModelIndex& parent) const;
+
+    void getLogo(const QString &logo, const QString &logoUrl, LogoCallback callback);
+    void searchWithTerm(const QString & term);
+
+private slots:
+    void searchRequestFinished();
+    void searchRequestFailed();
+
+    void logoFailed(QString logo);
+    void logoLoaded(QString logo, QString out);
+
+private:
+    void performSearch();
+    void requestLogo(QString logo, QString url);
+
+private:
+    QList<Modpack> modpacks;
+    QStringList m_failedLogos;
+    QStringList m_loadingLogos;
+    QMap<QString, QIcon> m_logoMap;
+    QMap<QString, LogoCallback> waitingCallbacks;
+
+    QString currentSearchTerm;
+    enum SearchState {
+        None,
+        ResetRequested,
+        Finished
+    } searchState = None;
+    NetJob::Ptr jobPtr;
+    QByteArray response;
+};
+
+}