pre-on-event

Called when this window or a child window receives a mouse event. The top-most parent's pre-on-event method is called first; if the return value is #f, the pre-on-event method is called for the next child in the path to the receiver. Finally, if the receiver's pre-on-event method returns #f, the event is passed on to the receiver's normal mouse-handling mechanism.

• (send a-mred:empty-frame pre-on-event receiver event) -> boolean
      receiver : wx:window% object
      event : wx:key-event% object

  The event argument is the event that was generated for the receiver window.

  This gives the mouse event to the keymap and if there is no binding for it, calls the super-method.