public final boolean isMouseButtonEvent(){
  return MOUSE_BUTTON_EVENTS.contains(getType());
}

public final boolean isMouseButtonEvent ( ) { return MOUSE_BUTTON_EVENTS . contains ( getType ( ) ) ; }
todo ( danilatos ) : click + drag ? i . e . return true for mouse move , if the button is pressed ? ( this might be useful for tracking changing selections as the user holds & drags )
