mainwindow.cpp Example File
^{painting/svgviewer/mainwindow.cpp}

    /****************************************************************************
    **
    ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the documentation of the Qt Toolkit.
    **
    ** This file may be used under the terms of the GNU General Public
    ** License version 2.0 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 GNU
    ** General Public Licensing requirements will be met:
    ** http://www.trolltech.com/products/qt/opensource.html
    **
    ** If you are unsure which license is appropriate for your use, please
    ** review the following information:
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    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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    ****************************************************************************/

    #include <QtGui>

    #include "mainwindow.h"

    MainWindow::MainWindow()
        : QMainWindow()
    {
        area = new SvgWindow;

        QMenu *fileMenu = new QMenu(tr("&File"), this);
        QAction *openAction = fileMenu->addAction(tr("&Open..."));
        openAction->setShortcut(QKeySequence(tr("Ctrl+O")));
        QAction *quitAction = fileMenu->addAction(tr("E&xit"));
        quitAction->setShortcut(QKeySequence(tr("Ctrl+Q")));

        menuBar()->addMenu(fileMenu);

        QMenu *rendererMenu = new QMenu(tr("&Renderer"), this);
        nativeAction = rendererMenu->addAction(tr("&Native"));
        nativeAction->setCheckable(true);
        nativeAction->setChecked(true);
        #ifndef QT_NO_OPENGL
        glAction = rendererMenu->addAction(tr("&OpenGL"));
        glAction->setCheckable(true);
        #endif
        imageAction = rendererMenu->addAction(tr("&Image"));
        imageAction->setCheckable(true);

        QActionGroup *rendererGroup = new QActionGroup(this);
        rendererGroup->addAction(nativeAction);
        #ifndef QT_NO_OPENGL
        rendererGroup->addAction(glAction);
        #endif
        rendererGroup->addAction(imageAction);

        menuBar()->addMenu(rendererMenu);

        connect(openAction, SIGNAL(triggered()), this, SLOT(openFile()));
        connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
        connect(rendererGroup, SIGNAL(triggered(QAction *)),
                this, SLOT(setRenderer(QAction *)));

        setCentralWidget(area);
        setWindowTitle(tr("SVG Viewer"));
    }

    void MainWindow::openFile(const QString &path)
    {
        QString fileName;
        if (path.isNull())
            fileName = QFileDialog::getOpenFileName(this, tr("Open SVG File"),
                                                    currentPath, "*.svg");
        else
            fileName = path;

        if (!fileName.isEmpty()) {
            area->openFile(fileName);
            if (!fileName.startsWith(":/")) {
                currentPath = fileName;
                setWindowTitle(tr("%1 - SVGViewer").arg(currentPath));
            }
        }
    }

    void MainWindow::setRenderer(QAction *action)
    {
        if (action == nativeAction)
            area->setRenderer(SvgWindow::Native);
        #ifndef QT_NO_OPENGL
        else if (action == glAction)
            area->setRenderer(SvgWindow::OpenGL);
        #endif
        else if (action == imageAction)
            area->setRenderer(SvgWindow::Image);
    }