/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the examples of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:BSD$+
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** You may use this file under the terms of the BSD license as follows:+
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**+
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** "Redistribution and use in source and binary forms, with or without+
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** modification, are permitted provided that the following conditions are+
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** met:+
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**   * Redistributions of source code must retain the above copyright+
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**     notice, this list of conditions and the following disclaimer.+
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**   * Redistributions in binary form must reproduce the above copyright+
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**     notice, this list of conditions and the following disclaimer in+
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**     the documentation and/or other materials provided with the+
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**     distribution.+
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**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor+
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**     the names of its contributors may be used to endorse or promote+
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**     products derived from this software without specific prior written+
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**     permission.+
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**+
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS+
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT+
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR+
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT+
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,+
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT+
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,+
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY+
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT+
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE+
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include <QtGui>+
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+
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#include "mainwindow.h"+
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#include "diagramscene.h"+
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#include "diagramitem.h"+
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#include "commands.h"+
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+
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//! [0]+
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MainWindow::MainWindow()+
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{+
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    undoStack = new QUndoStack();+
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+
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    createActions();+
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    createMenus();+
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+
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    createUndoView();+
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+
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    diagramScene = new DiagramScene();+
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    QBrush pixmapBrush(QPixmap(":/images/cross.png").scaled(30, 30));+
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    diagramScene->setBackgroundBrush(pixmapBrush);+
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    diagramScene->setSceneRect(QRect(0, 0, 500, 500));+
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+
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    connect(diagramScene, SIGNAL(itemMoved(DiagramItem*,QPointF)),+
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            this, SLOT(itemMoved(DiagramItem*,QPointF)));+
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+
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    setWindowTitle("Undo Framework");+
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    QGraphicsView *view = new QGraphicsView(diagramScene);+
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    setCentralWidget(view);+
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    resize(700, 500);+
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}+
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//! [0]+
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+
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//! [1]+
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void MainWindow::createUndoView()+
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{+
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    undoView = new QUndoView(undoStack);+
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    undoView->setWindowTitle(tr("Command List"));+
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    undoView->show();+
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    undoView->setAttribute(Qt::WA_QuitOnClose, false);+
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}+
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//! [1]+
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+
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//! [2]+
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void MainWindow::createActions()+
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{+
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    deleteAction = new QAction(tr("&Delete Item"), this);+
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    deleteAction->setShortcut(tr("Del"));+
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    connect(deleteAction, SIGNAL(triggered()), this, SLOT(deleteItem()));+
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//! [2] //! [3]+
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+
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//! [3] //! [4]+
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    addBoxAction = new QAction(tr("Add &Box"), this);+
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//! [4]+
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    addBoxAction->setShortcut(tr("Ctrl+O"));+
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    connect(addBoxAction, SIGNAL(triggered()), this, SLOT(addBox()));+
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+
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    addTriangleAction = new QAction(tr("Add &Triangle"), this);+
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    addTriangleAction->setShortcut(tr("Ctrl+T"));+
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    connect(addTriangleAction, SIGNAL(triggered()), this, SLOT(addTriangle()));+
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+
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//! [5]+
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    undoAction = undoStack->createUndoAction(this, tr("&Undo"));+
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    undoAction->setShortcuts(QKeySequence::Undo);+
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+
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    redoAction = undoStack->createRedoAction(this, tr("&Redo"));+
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    redoAction->setShortcuts(QKeySequence::Redo);+
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//! [5]+
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+
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    exitAction = new QAction(tr("E&xit"), this);+
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    exitAction->setShortcuts(QKeySequence::Quit);+
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    connect(exitAction, SIGNAL(triggered()), this, SLOT(close()));+
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+
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    aboutAction = new QAction(tr("&About"), this);+
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    QList<QKeySequence> aboutShortcuts;+
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    aboutShortcuts << tr("Ctrl+A") << tr("Ctrl+B");+
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    aboutAction->setShortcuts(aboutShortcuts);+
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    connect(aboutAction, SIGNAL(triggered()), this, SLOT(about()));+
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}+
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+
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//! [6]+
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void MainWindow::createMenus()+
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{+
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//! [6]+
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    fileMenu = menuBar()->addMenu(tr("&File"));+
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    fileMenu->addAction(exitAction);+
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+
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//! [7]+
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    editMenu = menuBar()->addMenu(tr("&Edit"));+
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    editMenu->addAction(undoAction);+
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    editMenu->addAction(redoAction);+
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    editMenu->addSeparator();+
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    editMenu->addAction(deleteAction);+
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    connect(editMenu, SIGNAL(aboutToShow()),+
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            this, SLOT(itemMenuAboutToShow()));+
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    connect(editMenu, SIGNAL(aboutToHide()),+
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            this, SLOT(itemMenuAboutToHide()));+
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+
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//! [7]+
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    itemMenu = menuBar()->addMenu(tr("&Item"));+
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    itemMenu->addAction(addBoxAction);+
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    itemMenu->addAction(addTriangleAction);+
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+
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    helpMenu = menuBar()->addMenu(tr("&About"));+
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    helpMenu->addAction(aboutAction);+
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//! [8]+
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}+
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//! [8]+
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+
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//! [9]+
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void MainWindow::itemMoved(DiagramItem *movedItem,+
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                           const QPointF &oldPosition)+
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{+
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    undoStack->push(new MoveCommand(movedItem, oldPosition));+
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}+
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//! [9]+
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+
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//! [10]+
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void MainWindow::deleteItem()+
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{+
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    if (diagramScene->selectedItems().isEmpty())+
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        return;+
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+
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    QUndoCommand *deleteCommand = new DeleteCommand(diagramScene);+
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    undoStack->push(deleteCommand);+
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}+
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//! [10]+
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+
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//! [11]+
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void MainWindow::itemMenuAboutToHide()+
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{+
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    deleteAction->setEnabled(true);+
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}+
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//! [11]+
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+
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//! [12]+
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void MainWindow::itemMenuAboutToShow()+
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{+
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    deleteAction->setEnabled(!diagramScene->selectedItems().isEmpty());+
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}+
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//! [12]+
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+
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//! [13]+
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void MainWindow::addBox()+
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{+
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    QUndoCommand *addCommand = new AddCommand(DiagramItem::Box, diagramScene);+
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    undoStack->push(addCommand);+
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}+
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//! [13]+
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+
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//! [14]+
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void MainWindow::addTriangle()+
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{+
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    QUndoCommand *addCommand = new AddCommand(DiagramItem::Triangle,+
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                                              diagramScene);+
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    undoStack->push(addCommand);+
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}+
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//! [14]+
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+
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//! [15]+
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void MainWindow::about()+
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{+
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    QMessageBox::about(this, tr("About Undo"),+
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                       tr("The <b>Undo</b> example demonstrates how to "+
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                          "use Qt's undo framework."));+
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}+
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//! [15]+
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