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# window.cpp Example File
opengl/2dpainting/window.cpp

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     #include <QtGui>
     #include "glwidget.h"
     #include "widget.h"
     #include "window.h"

     Window::Window()
         : QWidget()
     {
         Widget *native = new Widget(&helper, this);
         GLWidget *openGL = new GLWidget(&helper, this);
         QLabel *nativeLabel = new QLabel(tr("Native"));
         nativeLabel->setAlignment(Qt::AlignHCenter);
         QLabel *openGLLabel = new QLabel(tr("OpenGL"));
         openGLLabel->setAlignment(Qt::AlignHCenter);

         QGridLayout *layout = new QGridLayout;
         layout->addWidget(native, 0, 0);
         layout->addWidget(openGL, 0, 1);
         layout->addWidget(nativeLabel, 1, 0);
         layout->addWidget(openGLLabel, 1, 1);
         setLayout(layout);

         QTimer *timer = new QTimer(this);
         connect(timer, SIGNAL(timeout()), native, SLOT(animate()));
         connect(timer, SIGNAL(timeout()), openGL, SLOT(animate()));
         timer->start(50);

         setWindowTitle(tr("2D Painting on Native and OpenGL Widgets"));
     }