Flutter -如何从子窗口小部件调用父窗口小部件函数，同时使用变量维护状态？

class ParentWidget extends StatefulWidget {
  @override
  _ParentWidgetState createState() => _ParentWidgetState();
}

class _ParentWidgetState extends State<ParentWidget> {
  bool _isActive = false;
  
  void _updateStatus(bool value) {
    setState(() {
      _isActive = value;
    });
  }
  
  @override
  Widget build(BuildContext context) {
    return Container(
      child: ChildWidget(updateStatus: _updateStatus),
    );
  }
}

class ChildWidget extends StatelessWidget {
  final Function(bool) updateStatus;
  
  ChildWidget({required this.updateStatus});
  
  @override
  Widget build(BuildContext context) {
    return Container(
      child: RaisedButton(
        onPressed: () {
          updateStatus(true);
        },
        child: Text('Activate'),
      ),
    );
  }
}