// lib/services/playlist_events.dart
import 'dart:async';

/// 歌单数据变更事件（新建/重命名/删除/加歌/删歌/排序）。
///
/// 主页的歌单页、歌单详情页都靠它实时刷新，
/// 不用等页面重建。
class PlaylistEvents {
  static final PlaylistEvents _instance = PlaylistEvents._internal();
  factory PlaylistEvents() => _instance;
  PlaylistEvents._internal();

  final StreamController<void> _controller =
      StreamController<void>.broadcast();

  Stream<void> get stream => _controller.stream;

  void publish() {
    _controller.add(null);
  }
}