MainBloc class of Bloc Pattern

main_bloc.dart

class MainBloc {
  final itemProvider = ItemProvider();

  final itemsConroller = StreamController<List<Item>>();
  final detailedColorConroller = StreamController<Color>();
  final detailedItemConroller = StreamController<Item>();

  Stream get itemsStream => itemsConroller.stream;
  Stream get detailedColorStream => detailedColorConroller.stream;
  Stream get detailedItemStream => detailedItemConroller.stream;

  StreamSink<List<Item>> get itemsSink => itemsConroller.sink;
  StreamSink<Color> get detailedColorSink => detailedColorConroller.sink;
  StreamSink<Item> get detailedItemSink => detailedItemConroller.sink;

  List<Item> _items;
  int _detailedIndex;
  getItems() async {
    _items = await itemProvider.fetchItems();

    itemsSink.add(_items);
  }

  showDetailed(Color color, int index, Item item) {
    detailedColorSink.add(color);
    detailedItemSink.add(item);
    _detailedIndex = index;
  }

  increment() {
    _items[_detailedIndex].count++;
    itemsSink.add(_items);
    detailedItemSink.add(_items[_detailedIndex]);
  }

  void dispose() {
    itemsConroller.close();
    detailedColorConroller.close();
    detailedItemConroller.close();
  }
}

MainBloc mainBloc = MainBloc();

Have u got a full example of app?