code: private void notifyOnScrolled(final boolean scrolledToTop, final boolean scrolledToBottom) {
          for (ScrollListener listener : scrollListeners) {
              listener.onScrolled(scrolledToTop, scrolledToBottom);
          }
      }
docs: Notifies, when the scroll view has been scrolled.
  
  @param scrolledToTop
  True, if the scroll view is scrolled to the top, false otherwise
  @param scrolledToBottom
  True, if the scroll view is scrolled to the bottom, false otherwise