liangchengyou / wow_english

  import 'package:flutter/cupertino.dart';

  import 'package:flutter_bloc/flutter_bloc.dart';

  import 'package:wow_english/common/request/dao/lesson_dao.dart';

  import 'package:wow_english/common/request/exception.dart';

  import 'package:wow_english/models/course_module_entity.dart';

  import 'package:wow_english/utils/loading.dart';

  import 'package:wow_english/utils/toast_util.dart';

  part 'module_event.dart';
  part 'module_state.dart';

  class ModuleBloc extends Bloc<ModuleEvent, ModuleState> {

    final int pageIndex;
  
    final PageController pageController;
  
    int _currentPageIndex = 0;
  
    int get currentPageIndex => _currentPageIndex;
  

    List<CourseModuleEntity?> _listData = [];

    List<CourseModuleEntity?> get listData => _listData;
  

    ModuleBloc(this.pageIndex, this.pageController) : super(ModuleInitial()) {

      _currentPageIndex = pageIndex;
      on<PageViewChangeIndexEvent>(_pageIndexChange);

      on<RequestDataEvent>(_requestData);

    }
  

    void _pageIndexChange(PageViewChangeIndexEvent event, Emitter<ModuleState> emitter) async {

      _currentPageIndex = event.index;
      emitter(PageIndexChangeState());
    }
  

    void _requestData(RequestDataEvent event, Emitter<ModuleState> emitter) async {

      try {
        await loading(() async {

          _listData = await LessonDao.courseModule() ?? [];
          emitter(ModuleDataLoadState());

        });
      } catch (e) {
        if (e is ApiException) {

          showToast(e.message ?? '请求失败,请检查网络连接');

        }
      }
    }
  

    @override
    Future<void> close() {
      pageController.dispose();
      return super.close();
    }
  }