void SkinDial::keyPressEvent ( QKeyEvent * e ) {

  switch( e->key() ) {
    case Key_Left:
      setValue(Value - LineStep);
      break;

    case Key_Right:
      setValue(Value + LineStep);
      break;

    case Key_Prior:
      setValue(Value - PageStep);
      break;

    case Key_Next:
      setValue(Value + PageStep);
      break;
  }

}