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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+
+#include "mainwindow.h"
+#include "diagramscene.h"
+#include "diagramitem.h"
+#include "commands.h"
+
+//! [0]
+MainWindow::MainWindow()
+{
+ undoStack = new QUndoStack();
+
+ createActions();
+ createMenus();
+
+ createUndoView();
+
+ diagramScene = new DiagramScene();
+ QBrush pixmapBrush(QPixmap(":/images/cross.png").scaled(30, 30));
+ diagramScene->setBackgroundBrush(pixmapBrush);
+ diagramScene->setSceneRect(QRect(0, 0, 500, 500));
+
+ connect(diagramScene, SIGNAL(itemMoved(DiagramItem *, const QPointF &)),
+ this, SLOT(itemMoved(DiagramItem *, const QPointF &)));
+
+ setWindowTitle("Undo Framework");
+ QGraphicsView *view = new QGraphicsView(diagramScene);
+ setCentralWidget(view);
+ resize(700, 500);
+}
+//! [0]
+
+//! [1]
+void MainWindow::createUndoView()
+{
+ undoView = new QUndoView(undoStack);
+ undoView->setWindowTitle(tr("Command List"));
+ undoView->show();
+ undoView->setAttribute(Qt::WA_QuitOnClose, false);
+}
+//! [1]
+
+//! [2]
+void MainWindow::createActions()
+{
+ deleteAction = new QAction(tr("&Delete Item"), this);
+ deleteAction->setShortcut(tr("Del"));
+ connect(deleteAction, SIGNAL(triggered()), this, SLOT(deleteItem()));
+//! [2] //! [3]
+
+//! [3] //! [4]
+ addBoxAction = new QAction(tr("Add &Box"), this);
+//! [4]
+ addBoxAction->setShortcut(tr("Ctrl+O"));
+ connect(addBoxAction, SIGNAL(triggered()), this, SLOT(addBox()));
+
+ addTriangleAction = new QAction(tr("Add &Triangle"), this);
+ addTriangleAction->setShortcut(tr("Ctrl+T"));
+ connect(addTriangleAction, SIGNAL(triggered()), this, SLOT(addTriangle()));
+
+//! [5]
+ undoAction = undoStack->createUndoAction(this, tr("&Undo"));
+ undoAction->setShortcut(tr("Ctrl+Z"));
+
+ redoAction = undoStack->createRedoAction(this, tr("&Redo"));
+ QList<QKeySequence> redoShortcuts;
+ redoShortcuts << tr("Ctrl+Y") << tr("Shift+Ctrl+Z");
+ redoAction->setShortcuts(redoShortcuts);
+//! [5]
+
+ exitAction = new QAction(tr("E&xit"), this);
+ exitAction->setShortcut(tr("Ctrl+Q"));
+ connect(exitAction, SIGNAL(triggered()), this, SLOT(close()));
+
+ aboutAction = new QAction(tr("&About"), this);
+ QList<QKeySequence> aboutShortcuts;
+ aboutShortcuts << tr("Ctrl+A") << tr("Ctrl+B");
+ aboutAction->setShortcuts(aboutShortcuts);
+ connect(aboutAction, SIGNAL(triggered()), this, SLOT(about()));
+}
+
+//! [6]
+void MainWindow::createMenus()
+{
+//! [6]
+ fileMenu = menuBar()->addMenu(tr("&File"));
+ fileMenu->addAction(exitAction);
+
+//! [7]
+ editMenu = menuBar()->addMenu(tr("&Edit"));
+ editMenu->addAction(undoAction);
+ editMenu->addAction(redoAction);
+ editMenu->addSeparator();
+ editMenu->addAction(deleteAction);
+ connect(editMenu, SIGNAL(aboutToShow()),
+ this, SLOT(itemMenuAboutToShow()));
+ connect(editMenu, SIGNAL(aboutToHide()),
+ this, SLOT(itemMenuAboutToHide()));
+
+//! [7]
+ itemMenu = menuBar()->addMenu(tr("&Item"));
+ itemMenu->addAction(addBoxAction);
+ itemMenu->addAction(addTriangleAction);
+
+ helpMenu = menuBar()->addMenu(tr("&About"));
+ helpMenu->addAction(aboutAction);
+//! [8]
+}
+//! [8]
+
+//! [9]
+void MainWindow::itemMoved(DiagramItem *movedItem,
+ const QPointF &oldPosition)
+{
+ undoStack->push(new MoveCommand(movedItem, oldPosition));
+}
+//! [9]
+
+//! [10]
+void MainWindow::deleteItem()
+{
+ if (diagramScene->selectedItems().isEmpty())
+ return;
+
+ QUndoCommand *deleteCommand = new DeleteCommand(diagramScene);
+ undoStack->push(deleteCommand);
+}
+//! [10]
+
+//! [11]
+void MainWindow::itemMenuAboutToHide()
+{
+ deleteAction->setEnabled(true);
+}
+//! [11]
+
+//! [12]
+void MainWindow::itemMenuAboutToShow()
+{
+ deleteAction->setEnabled(!diagramScene->selectedItems().isEmpty());
+}
+//! [12]
+
+//! [13]
+void MainWindow::addBox()
+{
+ QUndoCommand *addCommand = new AddCommand(DiagramItem::Box, diagramScene);
+ undoStack->push(addCommand);
+}
+//! [13]
+
+//! [14]
+void MainWindow::addTriangle()
+{
+ QUndoCommand *addCommand = new AddCommand(DiagramItem::Triangle,
+ diagramScene);
+ undoStack->push(addCommand);
+}
+//! [14]
+
+//! [15]
+void MainWindow::about()
+{
+ QMessageBox::about(this, tr("About Undo"),
+ tr("The <b>Undo</b> example demonstrates how to "
+ "use Qt's undo framework."));
+}
+//! [15]