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# 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);
     }