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

    #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


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Qt 4.0.0-b2