Flutter:如何设置父构件的状态

class MyParentWidget extends StatefulWidget {
  @override
  _MyParentWidgetState createState() => _MyParentWidgetState();
}

class _MyParentWidgetState extends State<MyParentWidget> {
  bool _isParentActive = false;

  void _toggleParentState() {
    setState(() {
      _isParentActive = !_isParentActive;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Text('Parent Widget'),
        RaisedButton(
          child: Text(_isParentActive ? 'Deactivate' : 'Activate'),
          onPressed: _toggleParentState,
        ),
        // 子构件
        MyChildWidget(isActive: _isParentActive),
      ],
    );
  }
}

class MyChildWidget extends StatelessWidget {
  final bool isActive;

  MyChildWidget({this.isActive});

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Text('Child Widget'),
        Text(isActive ? 'Parent is active' : 'Parent is inactive'),
      ],
    );
  }
}