flutter_bloc 8: what is the best practice for listening to state changes from another bloc-CodePudding

What is the best practice for listening to another bloc’s state changes?

This answer was relevant in previous version, but it doesn’t work in version 8 (.listen method doesn’t exist anymore on a bloc): https://stackoverflow.com/a/62785980/160919

FilteredTodosBloc({@required this.todosBloc}) {
  todosSubscription = todosBloc.listen((state) {
    if (state is TodosLoadSuccess) {
      add(TodosUpdated((todosBloc.state as TodosLoadSuccess).todos));
    }
});}

What is the recommended approach to listen to a state change from another bloc in flutter_bloc 8?

CodePudding user response：

State stream is now exposed via stream getter, so you can still use almost the same code:

FilteredTodosBloc({required this.todosBloc}) {
  todosSubscription = todosBloc.stream.listen((state) {
    if (state is TodosLoadSuccess) {
      add(TodosUpdated((todosBloc.state as TodosLoadSuccess).todos));
    }
});}

CodePudding user response：

Nothing really changed in terms of recommended approach. All you have to do is call stream property first and listen to it intead of bloc directly. So if you previously listened to blocs / cubits like this: myBloc.listen((state) => print(state));

all you need to change is call stream first, like this:

myBloc.stream.listen((state) => print(state));