GH-2859 improve UI for twitch pack import with drag&drop

application/CMakeLists.txt

@@ -178,6 +178,8 @@ SET(MULTIMC_SOURCES
     widgets/Common.h
     widgets/CustomCommands.cpp
     widgets/CustomCommands.h
+    widgets/DropLabel.cpp
+    widgets/DropLabel.h
     widgets/FocusLineEdit.cpp
     widgets/FocusLineEdit.h
     widgets/IconLabel.cpp

application/pages/modplatform/TwitchPage.cpp

@@ -10,6 +10,11 @@ TwitchPage::TwitchPage(NewInstanceDialog* dialog, QWidget *parent)
 {
     ui->setupUi(this);
     connect(ui->checkButton, &QPushButton::clicked, this, &TwitchPage::triggerCheck);
+    connect(ui->twitchLabel, &DropLabel::droppedURLs, [this](QList<QUrl> urls){
+        if(urls.size()) {
+            setUrl(urls[0].toString());
+        }
+    });
 }
 
 TwitchPage::~TwitchPage()

application/pages/modplatform/TwitchPage.ui

@@ -6,23 +6,13 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>546</width>
+    <width>666</width>
-    <height>405</height>
+    <height>424</height>
    </rect>
   </property>
   <layout class="QGridLayout" name="gridLayout">
-   <item row="0" column="1">
-    <widget class="QLineEdit" name="lineEdit"/>
-   </item>
-   <item row="0" column="0">
-    <widget class="QLabel" name="label">
-     <property name="text">
-      <string>Twitch URL:</string>
-     </property>
-    </widget>
-   </item>
    <item row="1" column="0" colspan="3">
-    <widget class="QLabel" name="twitchLabel">
+    <widget class="DropLabel" name="twitchLabel">
      <property name="sizePolicy">
       <sizepolicy hsizetype="Preferred" vsizetype="Expanding">
        <horstretch>0</horstretch>
@@ -49,8 +39,35 @@
      </property>
     </widget>
    </item>
+   <item row="0" column="0">
+    <widget class="QLabel" name="label">
+     <property name="text">
+      <string>Twitch URL:</string>
+     </property>
+    </widget>
+   </item>
+   <item row="0" column="1">
+    <widget class="QLineEdit" name="lineEdit"/>
+   </item>
+   <item row="2" column="0" colspan="3">
+    <widget class="QLabel" name="label_2">
+     <property name="text">
+      <string>Drag and drop an Install button from CurseForge into the are above.</string>
+     </property>
+     <property name="alignment">
+      <set>Qt::AlignCenter</set>
+     </property>
+    </widget>
+   </item>
   </layout>
  </widget>
+ <customwidgets>
+  <customwidget>
+   <class>DropLabel</class>
+   <extends>QLabel</extends>
+   <header>widgets/DropLabel.h</header>
+  </customwidget>
+ </customwidgets>
  <tabstops>
   <tabstop>lineEdit</tabstop>
   <tabstop>checkButton</tabstop>

application/widgets/DropLabel.cpp

@@ -0,0 +1,41 @@
+#include "DropLabel.h"
+
+#include <QMimeData>
+#include <QDropEvent>
+
+DropLabel::DropLabel(QWidget *parent) : QLabel(parent)
+{
+    setAcceptDrops(true);
+}
+
+void DropLabel::dragEnterEvent(QDragEnterEvent *event)
+{
+    event->acceptProposedAction();
+}
+
+void DropLabel::dragMoveEvent(QDragMoveEvent *event)
+{
+    event->acceptProposedAction();
+}
+
+void DropLabel::dragLeaveEvent(QDragLeaveEvent *event)
+{
+    event->accept();
+}
+
+void DropLabel::dropEvent(QDropEvent *event)
+{
+    const QMimeData *mimeData = event->mimeData();
+
+    if (!mimeData)
+    {
+        return;
+    }
+
+    if (mimeData->hasUrls()) {
+        auto urls = mimeData->urls();
+        emit droppedURLs(urls);
+    }
+
+    event->acceptProposedAction();
+}

application/widgets/DropLabel.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <QLabel>
+
+class DropLabel : public QLabel
+{
+    Q_OBJECT
+
+public:
+    explicit DropLabel(QWidget *parent = nullptr);
+
+signals:
+    void droppedURLs(QList<QUrl> urls);
+
+protected:
+    void dropEvent(QDropEvent *event) override;
+    void dragEnterEvent(QDragEnterEvent *event) override;
+    void dragMoveEvent(QDragMoveEvent *event) override;
+    void dragLeaveEvent(QDragLeaveEvent *event) override;
+};