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# mainwindow.cpp Example File
opengl/hellogl_es/mainwindow.cpp

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     #include "mainwindow.h"

     #include <QApplication>
     #include <QMenuBar>
     #include <QGroupBox>
     #include <QGridLayout>
     #include <QSlider>
     #include <QLabel>
     #include <QTimer>

     #include "glwidget.h"

     MainWindow::MainWindow()
     {
         GLWidget *glwidget = new GLWidget();
         QLabel *label = new QLabel(this);
         QTimer *timer = new QTimer(this);
         QSlider *slider = new QSlider(this);
         slider->setOrientation(Qt::Horizontal);

         slider->setRange(0, 100);
         slider->setSliderPosition(50);
         timer->setInterval(10);
         label->setText("A QGlWidget with OpenGl ES");
         label->setAlignment(Qt::AlignHCenter);

         QGroupBox * groupBox = new QGroupBox(this);
         setCentralWidget(groupBox);
         groupBox->setTitle("OpenGL ES Example");

         QGridLayout *layout = new QGridLayout(groupBox);

         layout->addWidget(glwidget,1,0,8,1);
         layout->addWidget(label,9,0,1,1);
         layout->addWidget(slider, 11,0,1,1);

         groupBox->setLayout(layout);

         QMenu *fileMenu = new QMenu("File");
         QMenu *helpMenu = new QMenu("Help");
         QMenu *showMenu = new QMenu("Show");
         menuBar()->addMenu(fileMenu);
         menuBar()->addMenu(showMenu);
         menuBar()->addMenu(helpMenu);
         QAction *exit = new QAction("Exit", fileMenu);
         QAction *aboutQt = new QAction("AboutQt", helpMenu);
         QAction *showLogo = new QAction("Show 3D Logo", showMenu);
         QAction *showTexture = new QAction("Show 2D Texture", showMenu);
         QAction *showBubbles = new QAction("Show bubbles", showMenu);
         showBubbles->setCheckable(true);
         showBubbles->setChecked(true);
         fileMenu->addAction(exit);
         helpMenu->addAction(aboutQt);
         showMenu->addAction(showLogo);
         showMenu->addAction(showTexture);
         showMenu->addAction(showBubbles);

         QObject::connect(timer, SIGNAL(timeout()), glwidget, SLOT(updateGL()));
         QObject::connect(exit, SIGNAL(triggered(bool)), this, SLOT(close()));
         QObject::connect(aboutQt, SIGNAL(triggered(bool)), qApp, SLOT(aboutQt()));

         QObject::connect(showLogo, SIGNAL(triggered(bool)), glwidget, SLOT(setLogo()));
         QObject::connect(showTexture, SIGNAL(triggered(bool)), glwidget, SLOT(setTexture()));
         QObject::connect(showBubbles, SIGNAL(triggered(bool)), glwidget, SLOT(showBubbles(bool)));
         QObject::connect(slider, SIGNAL(valueChanged(int)), glwidget, SLOT(setScaling(int)));
         timer->start();
     }