EventBus not fire when in abstract base class

[lyquocnam]

create eventbus:

  injector.map<EventBus>((i) => new EventBus(sync: true));

i have base class like this:

abstract class BaseState<T extends StatefulWidget> extends State<T> {
  final _scaffoldKey = new GlobalKey<ScaffoldState>();

  final _event = injector.get<EventBus>();
  StreamSubscription _sub;

  @override
  void initState() {
    _sub = _event.on<MessageChangedEvent>().listen((event) {
       show(event.message);
    }, onError: (e) {
      print(e);
    }, onDone: () {
      print('done');
    });

      super.initState();
  }

  @override
    void dispose() {
      // TODO: implement dispose
      _sub.cancel();
      super.dispose();
    }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      key: _scaffoldKey,
      appBar: AppBar(
        title: Text(title()),
      ),
      body: content(),
    );
  }

  void show(String text) {
    _scaffoldKey.currentState.showSnackBar(SnackBar(
      content: Text(text),
    ));
  }

  String title();

  Widget content();

}

and fire event in child class:

class _State extends BaseState<AboutPage> {
  final _event = injector.get<EventBus>();

  // @override
  // void initState() {
  //   super.initState();
  //   _event.on<MessageChangedEvent>().listen((event) {
  //      show(event.message);
  //   });
  // }

  void shout() {
    _event.fire(new MessageChangedEvent('about', MessageType.info));
  }

  @override
  Widget content() {
    return RaisedButton(onPressed: shout, child: Text('login'));
  }

  @override
  String title() {
    return 'About';
  }

}

please see this case in demo project here: https://github.com/lyquocnam/flutter-event

ps: if listen event on child class, it's ok.

[marcojakob]

I think it is a problem with dependency injection. You might get two separate instances of EventBus from the injector (one for _BaseState and one for _State). Make sure that there is only one EventBus.

[lyquocnam]

@marcojakob you are right, the problem is injector, it work fine in normal. thanks for help author