Mobiles_programming/lib/presentation/home_page/bloc/bloc.dart

import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:mobiles_labs_5th_semester/data/repositories/games_repository.dart';
import 'events.dart';
import 'state.dart';

class HomeBloc extends Bloc<HomeEvent, HomeState> {
  final GamesRepository repo;

  //связывание метода _onLoadData с конкретным событием в конструкторе
  HomeBloc(this.repo) : super (const HomeState()) {
    on<HomeLoadDataEvent>(_onLoadData);
  }

  //Emitter - генератор событий
  Future<void> _onLoadData(HomeLoadDataEvent event, Emitter<HomeState> emit) async{
    if (event.nextPage == null) {
      emit(state.copyWith(isLoading: true));
    } else {
      emit(state.copyWith(isPaginationLoading: true));
    }

    String? error;

    final data = await repo.loadData(
      q: event.search,
      page: event.nextPage ?? 1,
      onError: (e) => error = e
    );
    if (event.nextPage != null) {
      data?.data?.insertAll(0, state.data?.data ?? []);
    }

    emit(state.copyWith(
        data: data,
        isLoading: false,
        isPaginationLoading: false,
        error: error
    ));
  }
}