CodeMirrorEditorWidget.java 文件源码

@Override
public HandlerRegistration addFocusHandler(final FocusHandler handler) {
    if (!focusHandlerAdded) {
        focusHandlerAdded = true;
        this.codeMirror.on(this.editorOverlay, FOCUS, new EventHandlers.EventHandlerNoParameters() {

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