The QSlider widget provides a vertical or horizontal slider. ... QSlider  ( QWidget * parent=0, const char * name=0 )  . ... QSlider  ( int minValue, int maxValue, int step, int value, Orientation, QWidget * parent=0, const char * name=0 )  . ... virtual void  setPalette  ( const QPalette & )  . ... minValue is the minimum slider value. maxValue is the maximum slider value. step is the page step value. value is the initial value. orientation must be QSlider::Vertical or QSlider::Horizontal. ...