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window.cpp Example File
opengl/textures/window.cpp

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 #include <QtGui>

 #include "glwidget.h"
 #include "window.h"

 Window::Window()
 {
     QGridLayout *mainLayout = new QGridLayout;

     glWidgets[0][0] = 0;

     for (int i = 0; i < NumRows; ++i) {
         for (int j = 0; j < NumColumns; ++j) {
             QColor clearColor;
             clearColor.setHsv(((i * NumColumns) + j) * 255
                               / (NumRows * NumColumns - 1),
                               255, 63);

             glWidgets[i][j] = new GLWidget(0, glWidgets[0][0]);
             glWidgets[i][j]->setClearColor(clearColor);
             glWidgets[i][j]->rotateBy(+42 * 16, +42 * 16, -21 * 16);
             mainLayout->addWidget(glWidgets[i][j], i, j);

             connect(glWidgets[i][j], SIGNAL(clicked()),
                     this, SLOT(setCurrentGlWidget()));
         }
     }
     setLayout(mainLayout);

     currentGlWidget = glWidgets[0][0];

     QTimer *timer = new QTimer(this);
     connect(timer, SIGNAL(timeout()), this, SLOT(rotateOneStep()));
     timer->start(20);

     setWindowTitle(tr("Textures"));
 }

 void Window::setCurrentGlWidget()
 {
     currentGlWidget = qobject_cast<GLWidget *>(sender());
 }

 void Window::rotateOneStep()
 {
     if (currentGlWidget)
         currentGlWidget->rotateBy(+2 * 16, +2 * 16, -1 * 16);
 }