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

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     ** This file is part of the examples of the Qt Toolkit.
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     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3.0 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
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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);
         }
     }