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

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 #include "mainwindow.h"

 #include <QtGui>

 #include "svgview.h"

 MainWindow::MainWindow()
     : QMainWindow()
     , m_view(new SvgView)
 {
     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->setShortcuts(QKeySequence::Quit);

     menuBar()->addMenu(fileMenu);

     QMenu *viewMenu = new QMenu(tr("&View"), this);
     m_backgroundAction = viewMenu->addAction(tr("&Background"));
     m_backgroundAction->setEnabled(false);
     m_backgroundAction->setCheckable(true);
     m_backgroundAction->setChecked(false);
     connect(m_backgroundAction, SIGNAL(toggled(bool)), m_view, SLOT(setViewBackground(bool)));

     m_outlineAction = viewMenu->addAction(tr("&Outline"));
     m_outlineAction->setEnabled(false);
     m_outlineAction->setCheckable(true);
     m_outlineAction->setChecked(true);
     connect(m_outlineAction, SIGNAL(toggled(bool)), m_view, SLOT(setViewOutline(bool)));

     menuBar()->addMenu(viewMenu);

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

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

     QActionGroup *rendererGroup = new QActionGroup(this);
     rendererGroup->addAction(m_nativeAction);
 #ifndef QT_NO_OPENGL
     rendererGroup->addAction(m_glAction);
 #endif
     rendererGroup->addAction(m_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(m_view);
     setWindowTitle(tr("SVG Viewer"));
 }

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

     if (!fileName.isEmpty()) {
         QFile file(fileName);
         if (!file.exists()) {
             QMessageBox::critical(this, tr("Open SVG File"),
                            QString("Could not open file '%1'.").arg(fileName));

             m_outlineAction->setEnabled(false);
             m_backgroundAction->setEnabled(false);
             return;
         }

         m_view->openFile(file);

         if (!fileName.startsWith(":/")) {
             m_currentPath = fileName;
             setWindowTitle(tr("%1 - SVGViewer").arg(m_currentPath));
         }

         m_outlineAction->setEnabled(true);
         m_backgroundAction->setEnabled(true);

         resize(m_view->sizeHint() + QSize(80, 80 + menuBar()->height()));
     }
 }

 void MainWindow::setRenderer(QAction *action)
 {
 #ifndef QT_NO_OPENGL
     m_highQualityAntialiasingAction->setEnabled(false);
 #endif

     if (action == m_nativeAction)
         m_view->setRenderer(SvgView::Native);
 #ifndef QT_NO_OPENGL
     else if (action == m_glAction) {
         m_highQualityAntialiasingAction->setEnabled(true);
         m_view->setRenderer(SvgView::OpenGL);
     }
 #endif
     else if (action == m_imageAction) {
         m_view->setRenderer(SvgView::Image);
     }
 }