Flutter Bloc Listen to stream and emit state with Cubit

January 16, 2023

How can I listen to stream and emit state with Cubit?

With Bloc we can do something like this:

    on<VideoStreamPlayPauseEvent>(
      (event, emit) async {
        if (event.play) {
          await emit.forEach(
            videoStreamingRepo.videoDataStream,
            onData: (VideoData videoStreamData) => VideoStreamState(
              currentFrame: videoStreamData,
              isPlaying: true,
            ),
          );
        }

>Solution :

You should listen to the stream using listen()
and based on the event you can emit the desired state.

yourstream.listen((event) {
      if (event.play)
          emit(First State)
      else
          emit(Second State)
    });

Extra: Based on the demand of questioner

To Stop listening to stream:

StreamSubscription<Map<PlaceParam, dynamic>> subscription;
subscription = yourstream.listen((event) {
      if (event.play)
          emit(First State)
      else
          emit(Second State)

      ...
   
      subscription.cancel(); 👈 cancel this way
    });