Qt 4.5: widget.h Example File (opengl/2dpainting/widget.h)

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# widget.h Example File
opengl/2dpainting/widget.h

     /****************************************************************************
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     ** Contact: Qt Software Information (qt-info@nokia.com)
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     #ifndef WIDGET_H
     #define WIDGET_H

     #include <QWidget>

     class Helper;
     class QPaintEvent;

     class Widget : public QWidget
     {
         Q_OBJECT

     public:
         Widget(Helper *helper, QWidget *parent);

     public slots:
         void animate();

     protected:
         void paintEvent(QPaintEvent *event);

     private:
         Helper *helper;
         int elapsed;
     };

     #endif