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

     /****************************************************************************
     **
     ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the example classes 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);
     }