code: protected void onScrollBottom() {
          if (isEnableRecycling() && recycleManager.hasRecycledWidgets()) {
              recycleManager.recycle(RecyclePosition.BOTTOM);
          } else {
              load(offset, limit);
          }
      }
docs: Will be called once the scroll bar reached at the bottom of the scroll panel.
  This will load the current {@link this#offset} and {@link this#limit} and will
  check if recycling is enabled.