code: @Deprecated
    public Object f(com.google.gwt.user.client.Element e, int i) {
      setElement(e);
      setIndex(i);
      Widget w = GQuery.getAssociatedWidget(e);
      if (w != null) {
        f(w, i);
      } else {
        f(e.<com.google.gwt.dom.client.Element> cast());
      }
      return null;
    }
docs: Override this for GQuery methods which loop over matched elements and
  invoke a callback on each element.
  
  @param e takes a com.google.gwt.user.client.Element.