Finish preliminary offline support

* ProgressProvider now has an abort() call
* Abort button support added to the progress dialog
* YggdrasilTask and MojangAccount adapted to support abort

YggdrasilTask will time out after 10 seconds of no network activity, or when the user pushes the Play Offline button.
In offline mode, all instance update tasks are skipped! This will need further work.

gui/dialogs/AccountListDialog.cpp

@@ -25,6 +25,7 @@
 #include <gui/dialogs/EditAccountDialog.h>
 #include <gui/dialogs/ProgressDialog.h>
 #include <gui/dialogs/AccountSelectDialog.h>
+#include <logic/tasks/Task.h>
 
 #include <MultiMC.h>
 
@@ -117,14 +118,14 @@ void AccountListDialog::addAccount(const QString& errMsg)
 		QString password(loginDialog.password());
 
 		MojangAccountPtr account = MojangAccount::createFromUsername(username);
-/*
 		ProgressDialog progDialog(this);
-		AuthenticateTask authTask(account, password, &progDialog);
-		if (progDialog.exec(&authTask))
+		auto task = account->login(password);
+		progDialog.exec(task.get());
+		if(task->successful())
 		{
-			// Add the authenticated account to the accounts list.
-			MojangAccountPtr account = authTask.getMojangAccount();
 			m_accounts->addAccount(account);
+			if (m_accounts->count() == 1)
+				m_accounts->setActiveAccount(account->username());
 
 			// Grab associated player skins
 			auto job = new NetJob("Player skins: " + account->username());
@@ -141,6 +142,5 @@ void AccountListDialog::addAccount(const QString& errMsg)
 
 			job->start();
 		}
-		*/
 	}
 }

gui/dialogs/ProgressDialog.cpp

@@ -25,11 +25,25 @@ ProgressDialog::ProgressDialog(QWidget *parent) : QDialog(parent), ui(new Ui::Pr
 {
 	MultiMCPlatform::fixWM_CLASS(this);
 	ui->setupUi(this);
-	updateSize();
-
+	this->setWindowFlags(this->windowFlags() & ~Qt::WindowContextHelpButtonHint);
+	setSkipButton(false);
 	changeProgress(0, 100);
 }
 
+void ProgressDialog::setSkipButton(bool present, QString label)
+{
+	ui->skipButton->setEnabled(present);
+	ui->skipButton->setVisible(present);
+	ui->skipButton->setText(label);
+	updateSize();
+}
+
+void ProgressDialog::on_skipButton_clicked(bool checked)
+{
+	Q_UNUSED(checked);
+	task->abort();
+}
+
 ProgressDialog::~ProgressDialog()
 {
 	delete ui;
@@ -51,9 +65,13 @@ int ProgressDialog::exec(ProgressProvider *task)
 	connect(task, SIGNAL(status(QString)), SLOT(changeStatus(const QString &)));
 	connect(task, SIGNAL(progress(qint64, qint64)), SLOT(changeProgress(qint64, qint64)));
 
-	// this makes sure that the task is started after the dialog is created
-	QMetaObject::invokeMethod(task, "start", Qt::QueuedConnection);
-	return QDialog::exec();
+	// if this didn't connect to an already running task, invoke start
+	if(!task->isRunning())
+		task->start();
+	if(task->isRunning())
+		return QDialog::exec();
+	else
+		return 0;
 }
 
 ProgressProvider *ProgressDialog::getTask()

gui/dialogs/ProgressDialog.h

@@ -35,6 +35,7 @@ public:
 	void updateSize();
 
 	int exec(ProgressProvider *task);
+	void setSkipButton(bool present, QString label = QString());
 
 	ProgressProvider *getTask();
 
@@ -47,7 +48,10 @@ slots:
 	void changeStatus(const QString &status);
 	void changeProgress(qint64 current, qint64 total);
 
-signals:
+	
+private
+slots:
+	void on_skipButton_clicked(bool checked);
 
 protected:
 	virtual void keyPressEvent(QKeyEvent *e);

gui/dialogs/ProgressDialog.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>400</width>
-    <height>68</height>
+    <height>100</height>
    </rect>
   </property>
   <property name="minimumSize">
@@ -25,8 +25,8 @@
   <property name="windowTitle">
    <string>Please wait...</string>
   </property>
-  <layout class="QVBoxLayout" name="verticalLayout">
-   <item>
+  <layout class="QGridLayout" name="gridLayout">
+   <item row="0" column="0">
     <widget class="QLabel" name="statusLabel">
      <property name="text">
       <string>Task Status...</string>
@@ -36,7 +36,7 @@
      </property>
     </widget>
    </item>
-   <item>
+   <item row="1" column="0">
     <widget class="QProgressBar" name="taskProgressBar">
      <property name="value">
       <number>24</number>
@@ -46,6 +46,19 @@
      </property>
     </widget>
    </item>
+   <item row="2" column="0">
+    <widget class="QPushButton" name="skipButton">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="text">
+      <string>Skip</string>
+     </property>
+    </widget>
+   </item>
   </layout>
  </widget>
  <resources/>