BookletFormBloc constructor Null safety

BookletFormBloc(
  1. String? appId,
  2. {FormAction? formAction}
)

Implementation

BookletFormBloc(this.appId, {this.formAction})
    : super(BookletFormUninitialized()) {
  on<InitialiseNewBookletFormEvent>((event, emit) {
    BookletFormLoaded loaded = BookletFormLoaded(
        value: BookletModel(
      documentID: "",
      appId: "",
      description: "",
      sections: [],
    ));
    emit(loaded);
  });

  on<InitialiseBookletFormEvent>((event, emit) async {
    // Need to re-retrieve the document from the repository so that I get all associated types
    BookletFormLoaded loaded = BookletFormLoaded(
        value: await bookletRepository(appId: appId)!
            .get(event.value!.documentID));
    emit(loaded);
  });
  on<InitialiseBookletFormNoLoadEvent>((event, emit) async {
    BookletFormLoaded loaded = BookletFormLoaded(value: event.value);
    emit(loaded);
  });
  BookletModel? newValue;
  on<ChangedBookletDocumentID>((event, emit) async {
    if (state is BookletFormInitialized) {
      final currentState = state as BookletFormInitialized;
      newValue = currentState.value!.copyWith(documentID: event.value);
      if (formAction == FormAction.addAction) {
        emit(await _isDocumentIDValid(event.value, newValue!));
      } else {
        emit(SubmittableBookletForm(value: newValue));
      }
    }
  });
  on<ChangedBookletDescription>((event, emit) async {
    if (state is BookletFormInitialized) {
      final currentState = state as BookletFormInitialized;
      newValue = currentState.value!.copyWith(description: event.value);
      emit(SubmittableBookletForm(value: newValue));
    }
  });
  on<ChangedBookletSections>((event, emit) async {
    if (state is BookletFormInitialized) {
      final currentState = state as BookletFormInitialized;
      newValue = currentState.value!.copyWith(sections: event.value);
      emit(SubmittableBookletForm(value: newValue));
    }
  });
  on<ChangedBookletConditions>((event, emit) async {
    if (state is BookletFormInitialized) {
      final currentState = state as BookletFormInitialized;
      newValue = currentState.value!.copyWith(conditions: event.value);
      emit(SubmittableBookletForm(value: newValue));
    }
  });
}