question: private boolean processMouseEvent ( MouseEvent e ) { int id = e . getID ( ) ; Component mouseOver = nativeContainer . getMouseEventTarget ( e . getX ( ) , e . getY ( ) , Container . INCLUDE_SELF ) ; trackMouseEnterExit ( mouseOver , e ) ; Component met = mouseEventTarget . get ( ) ; if ( ! isMouseGrab ( e ) && id != MouseEvent . MOUSE_CLICKED ) { met = ( mouseOver != nativeContainer ) ? mouseOver : null ; mouseEventTarget = new WeakReference < > ( met ) ; } if ( met != null ) { switch ( id ) { case MouseEvent . MOUSE_ENTERED : case MouseEvent . MOUSE_EXITED : break ; case MouseEvent . MOUSE_PRESSED : retargetMouseEvent ( met , id , e ) ; break ; case MouseEvent . MOUSE_RELEASED : retargetMouseEvent ( met , id , e ) ; break ; case MouseEvent . MOUSE_CLICKED : if ( mouseOver == met ) { retargetMouseEvent ( mouseOver , id , e ) ; } break ; case MouseEvent . MOUSE_MOVED : retargetMouseEvent ( met , id , e ) ; break ; case MouseEvent . MOUSE_DRAGGED : if ( isMouseGrab ( e ) ) { retargetMouseEvent ( met , id , e ) ; } break ; case MouseEvent . MOUSE_WHEEL : if ( eventLog . isLoggable ( PlatformLogger . Level . FINEST ) && ( mouseOver != null ) ) { eventLog . finest ( "retargeting mouse wheel to " + mouseOver . getName ( ) + ", " + mouseOver . getClass ( ) ) ; } retargetMouseEvent ( mouseOver , id , e ) ; break ; } if ( id != MouseEvent . MOUSE_WHEEL ) { e . consume ( ) ; } } return e . isConsumed ( ) ; }
target:  This method attempts to distribute a mouse event to a lightweight component.  It tries to avoid doing any unnecessary probes down into the component tree to minimize the overhead of determining where to route the event, since mouse movement events tend to come in large and frequent amounts.