qt5base-lts/examples/tools/undoframework/mainwindow.cpp

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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
** $QT_END_LICENSE$
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****************************************************************************/
#include <QtGui>
#include "mainwindow.h"
#include "diagramscene.h"
#include "diagramitem.h"
#include "commands.h"
//! [0]
MainWindow::MainWindow()
{
undoStack = new QUndoStack(this);
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*,QPointF)),
this, SLOT(itemMoved(DiagramItem*,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->setShortcuts(QKeySequence::Undo);
redoAction = undoStack->createRedoAction(this, tr("&Redo"));
redoAction->setShortcuts(QKeySequence::Redo);
//! [5]
exitAction = new QAction(tr("E&xit"), this);
exitAction->setShortcuts(QKeySequence::Quit);
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]