hydrated_bloc 0.2.0

An extension to the bloc state management library which automatically persists and restores bloc states.

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An extension to the bloc state management library which automatically persists and restores bloc states.

Usage

1. Use HydratedBlocDelegate

void main() async {
  BlocSupervisor.delegate = await HydratedBlocDelegate.build();
  runApp(App());
}

2. Extend HydratedBloc

enum CounterEvent { increment, decrement }

class CounterState {
  int value;

  CounterState(this.value);
}

class CounterBloc extends HydratedBloc<CounterEvent, CounterState> {
  @override
  CounterState get initialState {
    return super.initialState ?? CounterState(0);
  }

  @override
  Stream<CounterState> mapEventToState(CounterEvent event) async* {
    switch (event) {
      case CounterEvent.decrement:
        yield CounterState(currentState.value - 1);
        break;
      case CounterEvent.increment:
        yield CounterState(currentState.value + 1);
        break;
    }
  }

  @override
  CounterState fromJson(Map<String, dynamic> source) {
    return CounterState(source['value'] as int);
  }

  @override
  Map<String, int> toJson(CounterState state) {
    return {'value': state.value};
  }
}

Now our CounterBloc is a HydratedBloc and will automatically persist its state. We can increment the counter value, hot restart, kill the app, etc... and our CounterBloc will always retain its state.