# PresentationListBloc constructor Null safety

PresentationListBloc(

1. {FilterPresentationModels? filter,
2. bool? paged,
3. String? orderBy,
4. bool? descending,
5. bool? detailed,
6. EliudQuery? eliudQuery,
7. required PresentationRepository presentationRepository,
8. int presentationLimit = 5}

)

## Implementation

    PresentationListBloc(
        {this.filter,
        this.paged,
        this.orderBy,
        this.descending,
        this.detailed,
        this.eliudQuery,
        required PresentationRepository presentationRepository,
        this.presentationLimit = 5})
        : _presentationRepository = presentationRepository,
          super(PresentationListLoading()) {
      on<LoadPresentationList>((event, emit) {
        if ((detailed == null) || (!detailed!)) {
          _mapLoadPresentationListToState();
        } else {
          _mapLoadPresentationListWithDetailsToState();
        }
      });

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

      on<PresentationChangeQuery>((event, emit) {
        eliudQuery = event.newQuery;
        if ((detailed == null) || (!detailed!)) {
          _mapLoadPresentationListToState();
        } else {
          _mapLoadPresentationListWithDetailsToState();
        }
      });

      on<AddPresentationList>((event, emit) async {
        await _mapAddPresentationListToState(event);
      });

      on<UpdatePresentationList>((event, emit) async {
        await _mapUpdatePresentationListToState(event);
      });

      on<DeletePresentationList>((event, emit) async {
        await _mapDeletePresentationListToState(event);
      });

      on<PresentationListUpdated>((event, emit) {
        emit(_mapPresentationListUpdatedToState(event));
      });
    }