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

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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);

     #ifndef QT_NO_OPENGL
     rendererMenu->addSeparator();
     highQualityAntialiasingAction = rendererMenu->addAction(tr("&High Quality Antialiasing"));
     highQualityAntialiasingAction->setEnabled(false);
     highQualityAntialiasingAction->setCheckable(true);
     highQualityAntialiasingAction->setChecked(false);
     connect(highQualityAntialiasingAction, SIGNAL(toggled(bool)), this, SLOT(setHighQualityAntialiasing(bool)));
     #endif

     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::setHighQualityAntialiasing(bool highQualityAntialiasing)
 {
     area->setHighQualityAntialiasing(highQualityAntialiasing);
 }

 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)
 {
     #ifndef QT_NO_OPENGL
     highQualityAntialiasingAction->setEnabled(false);
     #endif

     if (action == nativeAction)
         area->setRenderer(SvgWindow::Native);
     #ifndef QT_NO_OPENGL
     else if (action == glAction) {
         area->setRenderer(SvgWindow::OpenGL);
         highQualityAntialiasingAction->setEnabled(true);
     }
     #endif
     else if (action == imageAction)
         area->setRenderer(SvgWindow::Image);
 }