event* handler::dispatch( event* e ) {
    	_event = e; 
    	int res = this->operator()();
  	return (res != OK) ? _event : 0;
    }
    
    int handler::operator()() { 
  
    	event& e = * _event;                 
 fetch event
  
    	if ( e.type() == ButtonPress ) press(e);
    	else if ( e.type() == ButtonRelease ) release(e);
    	else if ( e.type() == KeyPress ) keypress(e);
    	else if ( e.type() == KeyRelease ) keyrelease(e);
    	else if ( e.type() == MotionNotify ) motion(e);
    	else if ( e.type() == EnterNotify ) enter(e);
    	else if ( e.type() == LeaveNotify ) leave(e);
    	else other(e);
    	return OK;
    }