Implement legacy forge button!

Many refactors of the task system.
Progress dialog now accepts generic ProgressProvider objects

gui/ProgressDialog.cpp

@@ -0,0 +1,108 @@
+/* Copyright 2013 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 "ProgressDialog.h"
+#include "ui_ProgressDialog.h"
+
+#include <QKeyEvent>
+
+#include "logic/tasks/Task.h"
+
+ProgressDialog::ProgressDialog(QWidget *parent) :
+	QDialog(parent),
+	ui(new Ui::ProgressDialog)
+{
+	ui->setupUi(this);
+	updateSize();
+	
+	changeProgress(0,100);
+}
+
+ProgressDialog::~ProgressDialog()
+{
+	delete ui;
+}
+
+void ProgressDialog::updateSize()
+{
+	resize(QSize(480, minimumSizeHint().height()));
+}
+
+int ProgressDialog::exec(ProgressProvider *task)
+{
+	this->task = task;
+	
+	// Connect signals.
+	connect(task, SIGNAL(started()), SLOT(onTaskStarted()));
+	connect(task, SIGNAL(failed(QString)), SLOT(onTaskFailed(QString)));
+	connect(task, SIGNAL(succeeded()), SLOT(onTaskSucceeded()));
+	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();
+}
+
+ProgressProvider* ProgressDialog::getTask()
+{
+	return task;
+}
+
+void ProgressDialog::onTaskStarted()
+{
+	
+}
+
+void ProgressDialog::onTaskFailed(QString failure)
+{
+	reject();
+}
+
+void ProgressDialog::onTaskSucceeded()
+{
+	accept();
+}
+
+void ProgressDialog::changeStatus(const QString &status)
+{
+	ui->statusLabel->setText(status);
+	updateSize();
+}
+
+void ProgressDialog::changeProgress(qint64 current, qint64 total)
+{
+	ui->taskProgressBar->setMaximum(total);
+	ui->taskProgressBar->setValue(current);
+}
+
+void ProgressDialog::keyPressEvent(QKeyEvent* e)
+{
+	if (e->key() == Qt::Key_Escape)
+		return;
+	QDialog::keyPressEvent(e);
+}
+
+void ProgressDialog::closeEvent(QCloseEvent* e)
+{
+	if (task && task->isRunning())
+	{
+		e->ignore();
+	}
+	else
+	{
+		QDialog::closeEvent(e);
+	}
+}