code: public static void reverseAnimate(Widget source, Widget target, Functions.Func reverseCallback) {
          reverseAnimate(source.getElement(), target.getElement(), reverseCallback);
      }
docs: Helper method to reverse animate the source element to target element with reverse callback.
  
  @param source          Source widget to apply the Path Animator
  @param target          Target widget to apply the Path Animator
  @param reverseCallback The reverse callback method to be called when the path animator is applied