import 'dart:async'; class EventBus { static final EventBus _instance = EventBus._internal(); factory EventBus() => _instance; EventBus._internal(); final _streamController = StreamController.broadcast(); Stream get stream => _streamController.stream; void fire(dynamic event) { _streamController.add(event); } void dispose() { _streamController.close(); } } // 이벤트 클래스들 class ClubChangedEvent { final String clubId; ClubChangedEvent(this.clubId); }