question: public DragContext ( Node draggable ) { this . node = draggable ; this . goToForegroundOnContact = true ; this . touchId = NULL_ID ; this . activated = false ; this . dragLimits = new BoundingBox ( 0 , 0 , Integer . MAX_VALUE , Integer . MAX_VALUE ) ; this . dragThreshold = 10.0 ; this . dragStarted = false ; this . relocateThreshold = 1.0 ; this . dragInitAction = null ; this . dragFinishAction = null ; touchHandler = null ; mouseHandler = null ; draggable . addEventHandler ( TouchEvent . ANY , touchHandler ) ; draggable . addEventHandler ( MouseEvent . ANY , mouseHandler ) ; }
target:  Creates a DragContext keeping track of touch events, so that a Node is made draggable.