# hgeGUIObject::MouseWheel Notifies the control of mouse wheel shift.
    virtual bool MouseWheel(
      int nNotches
    );
## Parameters nNotches Number of notches the mouse wheel was rotated through. A positive value indicates that the wheel was rotated forward, away from the user; a negative value indicates that the wheel was rotated backward, toward the user. ## Return value If the control has modified it's state and wants the caller to be notified, MouseWheel should return true. Otherwise it should return false. ## Remarks hgeGUIObject has default implementation, so you could not redefine this method if you don't need it. ## Requirements Header: hgegui.h ## See also MouseLButton, MouseRButton, MouseMove