Flutter Bloc 使用 Cubit 监听流和emits 状态

发布于01月16日

我如何收听Cubit的流和emits 状态？

有了Bloc，我们可以做这样的事情:

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

推荐答案

你应该用listen()来听stream 而基于event，你可以得到emit想要的状态.

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
    });