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# mainwindow.cpp Example File
painting/svgviewer/mainwindow.cpp

        /****************************************************************************
        **
        ** Copyright (C) 2005-2006 Trolltech AS. 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:
        ** http://www.trolltech.com/products/qt/licensing.html or contact the
        ** sales department at sales@trolltech.com.
        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        **
        ****************************************************************************/

        #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);
        }