如何在Flutter中正确扩展自定义提供程序

class CustomProvider extends InheritedWidget {
  final String data;
  final Function updateData;
  
  CustomProvider({
    Key key,
    @required this.data,
    @required this.updateData,
    @required Widget child,
  }) : super(key: key, child: child);
  
  static CustomProvider of(BuildContext context) {
    return context.dependOnInheritedWidgetOfExactType<CustomProvider>();
  }
  
  @override
  bool updateShouldNotify(CustomProvider oldWidget) {
    return oldWidget.data != data;
  }
}

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return CustomProvider(
      data: 'Hello World',
      updateData: (newData) {
        // 更新数据的方法
      },
      child: MaterialApp(
        title: 'My App',
        home: MyHomePage(),
      ),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final customProvider = CustomProvider.of(context);
    
    return Scaffold(
      appBar: AppBar(
        title: Text('My App'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(customProvider.data),
            RaisedButton(
              onPressed: () {
                customProvider.updateData('New Data');
              },
              child: Text('Update Data'),
            ),
          ],
        ),
      ),
    );
  }
}