bool button_handler (GdkEventButton *);
bool motion_notify_handler (GdkEventMotion *);
bool deliver_event (GdkEvent *);
void deliver_enter_leave (Duple const & point, int state);
bool button_handler (GdkEventButton *);
bool motion_notify_handler (GdkEventMotion *);
bool deliver_event (GdkEvent *);
void deliver_enter_leave (Duple const & point, int state);