[flutter_bloc_hydrated_weather] SettingsBloc

settings_bloc.dart

class SettingsBloc extends HydratedBloc<SettingsEvent, SettingsState> {
  @override
  SettingsState get initialState =>
      super.initialState ??
      SettingsState(temperatureUnits: TemperatureUnits.celsius);

  @override
  Stream<SettingsState> mapEventToState(SettingsEvent event) async* {
    if (event is TemperatureUnitsToggled) {
      yield SettingsState(
        temperatureUnits:
            currentState.temperatureUnits == TemperatureUnits.celsius
                ? TemperatureUnits.fahrenheit
                : TemperatureUnits.celsius,
      );
    }
  }

  @override
  SettingsState fromJson(Map<String, dynamic> json) {
    return SettingsState(
      temperatureUnits:
          TemperatureUnits.values[json['temperatureUnits'] as int],
    );
  }

  @override
  Map<String, dynamic> toJson(SettingsState state) {
    return {'temperatureUnits': state.temperatureUnits.index};
  }
}