mainwindow.cpp Example File

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 //Own
 #include "mainwindow.h"
 #include "graphicsscene.h"

 //Qt
 #include <QGraphicsView>

 #ifdef QT_NO_OPENGL
     #include <QtGui/QMenuBar>
     #include <QtGui/QLayout>
     #include <QtGui/QApplication>
 #else
     #include <QtOpenGL/QtOpenGL>
 #endif

 MainWindow::MainWindow() : QMainWindow(0)
 {
     QMenu *file = menuBar()->addMenu(tr("&File"));

     QAction *newAction = file->addAction(tr("New Game"));
     newAction->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_N));
     QAction *quitAction = file->addAction(tr("Quit"));
     quitAction->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_Q));

     if (QApplication::arguments().contains("-fullscreen")) {
         scene = new GraphicsScene(0, 0, 750, 400, GraphicsScene::Small);
         setWindowState(Qt::WindowFullScreen);
     } else {
         scene = new GraphicsScene(0, 0, 880, 630);
         layout()->setSizeConstraint(QLayout::SetFixedSize);
     }

     view = new QGraphicsView(scene, this);
     view->setAlignment(Qt::AlignLeft | Qt::AlignTop);
     scene->setupScene(newAction, quitAction);
 #ifndef QT_NO_OPENGL
     view->setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
 #endif

     setCentralWidget(view);
 }