points_completed.dart

class PointsCompleted extends PointsState {
  final List<Coordinate> coordinates;

  final int selectedItem;

  PointsCompleted(this.coordinates, {this.selectedItem});

  PointsCompleted copyWith({
    List<Coordinate> coordinates,
    int selectedItem,
  }) {
    return PointsCompleted(coordinates ?? this.coordinates,
        selectedItem: selectedItem ?? this.selectedItem);
  }
}

points_cubit.dart

class PointsCubit extends Cubit<PointsState> {
  Future<void> fetchPoints() async { }

  Future<void> fetchPointsCustomMarker() async {
    final responseItems = await mapService.getAllPoints();
    if (responseItems != null)
      emit(PointsCompleted(responseItems, selectedItem: 0));
    else
      emit(PointsError("Data Not Found"));
  }

  void changeSelectedCoordinate(int index, List<Coordinate> items) {
    final _state = state as PointsCompleted;
    emit(_state.copyWith(selectedItem: index));
  }
}