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circlewidget.h Example File
painting/concentriccircles/circlewidget.h

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 #ifndef CIRCLEWIDGET_H
 #define CIRCLEWIDGET_H

 #include <QWidget>

 class CircleWidget : public QWidget
 {
     Q_OBJECT

 public:
     CircleWidget(QWidget *parent = 0);

     void setFloatBased(bool floatBased);
     void setAntialiased(bool antialiased);

     QSize minimumSizeHint() const;
     QSize sizeHint() const;

 public slots:
     void nextAnimationFrame();

 protected:
     void paintEvent(QPaintEvent *event);

 private:
     bool floatBased;
     bool antialiased;
     int frameNo;
 };

 #endif