如何在BLoC设置中使用Flutters导航器？

import 'package:rxdart/rxdart.dart';

class NavigationBloc {
  final _navigationController = BehaviorSubject<String>();

  // 添加导航事件到流中
  void navigateTo(String route) {
    _navigationController.add(route);
  }

  // 获取导航事件的流
  Stream<String> get navigationStream => _navigationController.stream;

  // 关闭流
  void dispose() {
    _navigationController.close();
  }
}

class MyPage extends StatefulWidget {
  final NavigationBloc navigationBloc;

  MyPage({required this.navigationBloc});

  @override
  _MyPageState createState() => _MyPageState();
}

class _MyPageState extends State<MyPage> {
  late StreamSubscription<String> _navigationSubscription;

  @override
  void initState() {
    super.initState();
    _navigationSubscription = widget.navigationBloc.navigationStream.listen((route) {
      // 执行导航操作
      Navigator.pushNamed(context, route);
    });
  }

  @override
  void dispose() {
    _navigationSubscription.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    // 页面的UI构建
    return Scaffold(
      // ...
    );
  }
}

class MyButton extends StatelessWidget {
  final NavigationBloc navigationBloc;

  MyButton({required this.navigationBloc});

  @override
  Widget build(BuildContext context) {
    return ElevatedButton(
      onPressed: () {
        // 触发导航事件
        navigationBloc.navigateTo('/second_page');
      },
      child: Text('Go to Second Page'),
    );
  }
}