# TutorialListBloc constructor Null safety

TutorialListBloc(

1. {FilterTutorialModels? filter,
2. bool? paged,
3. String? orderBy,
4. bool? descending,
5. bool? detailed,
6. EliudQuery? eliudQuery,
7. required TutorialRepository tutorialRepository,
8. int tutorialLimit = 5}

)

## Implementation

    TutorialListBloc(
        {this.filter,
        this.paged,
        this.orderBy,
        this.descending,
        this.detailed,
        this.eliudQuery,
        required TutorialRepository tutorialRepository,
        this.tutorialLimit = 5})
        : _tutorialRepository = tutorialRepository,
          super(TutorialListLoading()) {
      on<LoadTutorialList>((event, emit) {
        if ((detailed == null) || (!detailed!)) {
          _mapLoadTutorialListToState();
        } else {
          _mapLoadTutorialListWithDetailsToState();
        }
      });

      on<NewPage>((event, emit) {
        pages = pages +
            1; // it doesn't matter so much if we increase pages beyond the end
        _mapLoadTutorialListWithDetailsToState();
      });

      on<TutorialChangeQuery>((event, emit) {
        eliudQuery = event.newQuery;
        if ((detailed == null) || (!detailed!)) {
          _mapLoadTutorialListToState();
        } else {
          _mapLoadTutorialListWithDetailsToState();
        }
      });

      on<AddTutorialList>((event, emit) async {
        await _mapAddTutorialListToState(event);
      });

      on<UpdateTutorialList>((event, emit) async {
        await _mapUpdateTutorialListToState(event);
      });

      on<DeleteTutorialList>((event, emit) async {
        await _mapDeleteTutorialListToState(event);
      });

      on<TutorialListUpdated>((event, emit) {
        emit(_mapTutorialListUpdatedToState(event));
      });
    }