liangchengyou / wow_english

  import 'package:flutter/cupertino.dart';
  import 'package:flutter_bloc/flutter_bloc.dart';

  
  part 'topic_picture_event.dart';

  part 'topic_picture_state.dart';

  
  class TopicPictureBloc extends Bloc<TopicPictureEvent, TopicPictureState> {

  
    final PageController pageController;
  
    final int modelCount;
  
    int _currentPage = 0;
  
    int _selectItem = 0;
  
    int get currentPage => _currentPage + 1;
  
    int get selectItem => _selectItem;
  
    TopicPictureBloc(this.pageController, this.modelCount) : super(TopicPictureInitial()) {
      on<CurrentPageIndexChangeEvent>(_pageControllerChange);
      on<SelectItemEvent>(_selectItemLoad);
    }
  
    @override
    Future<void> close() {
      pageController.dispose();
      return super.close();
    }
  
    void _pageControllerChange(CurrentPageIndexChangeEvent event,Emitter<TopicPictureState> emitter) async {
      _currentPage = event.pageIndex;
      emitter(CurrentPageIndexState());
    }
  
    void _selectItemLoad(SelectItemEvent event,Emitter<TopicPictureState> emitter) async {
      _selectItem = event.selectIndex;
      emitter(SelectItemChangeState());

    }
  }