shapedclock.h Example File
widgets/shapedclock/shapedclock.h

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 #ifndef SHAPEDCLOCK_H
 #define SHAPEDCLOCK_H

 #include <QWidget>

 class ShapedClock : public QWidget
 {
     Q_OBJECT

 public:
     ShapedClock(QWidget *parent = 0);
     QSize sizeHint() const;

 protected:
     void mouseMoveEvent(QMouseEvent *event);
     void mousePressEvent(QMouseEvent *event);
     void paintEvent(QPaintEvent *event);
     void resizeEvent(QResizeEvent *event);

 private:
     QPoint dragPosition;
 };

 #endif