analogclock.h Example File
widgets/analogclock/analogclock.h

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 #ifndef ANALOGCLOCK_H
 #define ANALOGCLOCK_H

 #include <QWidget>

 class AnalogClock : public QWidget
 {
     Q_OBJECT

 public:
     AnalogClock(QWidget *parent = 0);

 protected:
     void paintEvent(QPaintEvent *event);
 };

 #endif