OrionEditorWidget.java 文件源码

@Override
public HandlerRegistration addFocusHandler(FocusHandler handler) {
  if (!focusHandlerAdded) {
    focusHandlerAdded = true;
    final OrionTextViewOverlay textView = this.editorOverlay.getTextView();
    textView.addEventListener(
        OrionEventConstants.FOCUS_EVENT,
        new OrionTextViewOverlay.EventHandlerNoParameter() {

          @Override
          public void onEvent() {
            fireFocusEvent();
          }
        });
  }
  return addHandler(handler, FocusEvent.getType());
}