pinball/lib/assets_manager/cubit/assets_manager_cubit.dart

import 'package:bloc/bloc.dart';
import 'package:equatable/equatable.dart';
import 'package:pinball/game/game.dart';
import 'package:pinball/select_character/select_character.dart';
import 'package:pinball_audio/pinball_audio.dart';

part 'assets_manager_state.dart';

class AssetsManagerCubit extends Cubit<AssetsManagerState> {
  AssetsManagerCubit(this._game, this._audioPlayer)
      : super(const AssetsManagerState.initial());

  final PinballGame _game;
  final PinballAudioPlayer _audioPlayer;

  Future<void> load() async {
    /// Assigning loadables is a very expensive operation. With this purposeful
    /// delay here, which is a bit random in duration but enough to let the UI
    /// do its job without adding too much delay for the user, we are letting
    /// the UI paint first, and then we start loading the assets.
    await Future<void>.delayed(const Duration(seconds: 1));
    final loadables = <Future<void> Function()>[
      _game.preFetchLeaderboard,
      ..._game.preLoadAssets(),
      ..._audioPlayer.load(),
      ...BonusAnimation.loadAssets(),
      ...SelectedCharacter.loadAssets(),
    ];
    emit(
      state.copyWith(
        assetsCount: loadables.length,
      ),
    );

    late void Function() _triggerLoad;
    _triggerLoad = () async {
      if (loadables.isEmpty) return;
      final loadable = loadables.removeAt(0);
      await loadable();
      _triggerLoad();
      emit(state.copyWith(loaded: state.loaded + 1));
    };

    const _throttleSize = 3;
    for (var i = 0; i < _throttleSize; i++) {
      _triggerLoad();
    }
  }
}