#include <QtGui/qabstractslider.h>
#ifndef QABSTRACTSLIDER_H
class QAbstractSlider: public QWidget{
   /* Some contents are skipped to improve readability */
   protected: void setRepeatAction(enum QAbstractSlider::SliderAction action, int thresholdTime = 500, int repeatTime = 50);
   /* ... */
};
#endif // QABSTRACTSLIDER_H