code: public static void fire(final HasSummernoteFocusHandlers source) {
          if (TYPE != null) {
              SummernoteFocusEvent event = new SummernoteFocusEvent();
              source.fireEvent(event);
          }
      }
docs: Fires a summernote focus event on all registered handlers in the handler
  manager. If no such handlers exist, this method will do nothing.
  
  @param source the source of the handlers