Streams के साथ BLoC पैटर्न

final controller = StreamController<int>();
controller.stream.listen((value) => print(value));
controller.add(1);
controller.add(2);

abstract class CounterEvent {}
class Increment extends CounterEvent {}
class Decrement extends CounterEvent {}

class CounterState {
  final int count;
  const CounterState(this.count);
}

class CounterBloc extends Bloc<CounterEvent, CounterState> {
  CounterBloc() : super(const CounterState(0)) {
    on<Increment>((e, emit) => emit(CounterState(state.count + 1)));
    on<Decrement>((e, emit) => emit(CounterState(state.count - 1)));
  }
}

BlocProvider(
  create: (_) => CounterBloc(),
  child: const CounterPage(),
);

BlocBuilder<CounterBloc, CounterState>(
  builder: (context, state) => Text('Count: ' + state.count.toString()),
);

FloatingActionButton(
  onPressed: () => context.read<CounterBloc>().add(Increment()),
  child: const Icon(Icons.add),
);

BlocListener<CounterBloc, CounterState>(
  listener: (context, state) {
    if (state.count == 10) ScaffoldMessenger.of(context).showSnackBar(
      const SnackBar(content: Text('Reached 10!')),
    );
  },
  child: child,
);

class CounterCubit extends Cubit<int> {
  CounterCubit() : super(0);
  void increment() => emit(state + 1);
}