import 'dart:async';

import 'package:event_bus/event_bus.dart';

class EventBusUtil {
  static EventBus? _eventBus;

  //获取单例
  static EventBus getInstance() {
    _eventBus ??= EventBus();
    return _eventBus!;
  }

  //返回某事件的订阅者
  static StreamSubscription<T> listen<T extends Event>(Function(T event) onData) {
    _eventBus ??= EventBus();
    //内部流属于广播模式，可以有多个订阅者
    return _eventBus!.on<T>().listen(onData);
  }

  //发送事件
  static void fire<T extends Event>(T e) {
    _eventBus ??= EventBus();
    _eventBus!.fire(e);
  }
}

abstract class Event {}

class LoginEvent extends Event {
  static int eventIn = 1;
  static int eventOut = 0;
  final int status;

  LoginEvent(this.status);
}

class OrderStatusEvent extends Event {}

class PushStatusEvent extends Event {}

//导航切换
class TabBarEvent extends Event {
  final int Tab;

  TabBarEvent(this.Tab);
}

class PhoneLoginBackEvent extends Event {
  PhoneLoginBackEvent();
}

//导航跳转
class TabBarJumpEvent extends Event {
  int index;

  TabBarJumpEvent(this.index);
}

//画同款
class CopyDrawingEvent extends Event {
  CopyDrawingEvent();
}

//登录完成
class LoginSuccess extends Event {
  LoginSuccess();
}

//刷新用户信息
class RefreshUserdata extends Event {
  RefreshUserdata();
}