颤动-检测窗口小部件1在窗口小部件2上的Navigator.pop()之后是否可见？

// 窗口小部件2
class Widget2 extends StatefulWidget {
  @override
  _Widget2State createState() => _Widget2State();
}

class _Widget2State extends State<Widget2> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Widget2'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('Go Back'),
          onPressed: () {
            Navigator.pop(context, () {
              // 在这里执行回调函数
              bool isWidget1Visible = // 检查窗口小部件1是否可见的逻辑
              print('Widget1 is visible: $isWidget1Visible');
            });
          },
        ),
      ),
    );
  }
}

// 窗口小部件1
class Widget1 extends StatefulWidget {
  @override
  _Widget1State createState() => _Widget1State();
}

class _Widget1State extends State<Widget1> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Widget1'),
      ),
      body: Center(
        child: Text('Widget1'),
      ),
    );
  }
}

// 通过路由管理器导航到窗口小部件2
Navigator.push(
  context,
  MaterialPageRoute(builder: (context) => Widget2()),
);