import { emitter } from '@kit.BasicServicesKit';

type EmitterEventId = "parentShowNext" | "parentShowPrevious"
export class EmitterUtil {  private constructor() {  }
  /**   * 发送事件   */  static post(eventId: EmitterEventId, data?: Object, priority: emitter.EventPriority = emitter.EventPriority.HIGH) {    let eventData: emitter.EventData = { data: { "eventData": data } };    let options: emitter.Options = { priority: priority };    emitter.emit(eventId, options, eventData);  }

  /**   * 订阅事件   */  static onSubscribe(eventId: EmitterEventId, callback: (data?: Object) => void) {    emitter.on(eventId, (eventData: emitter.EventData) => {      callback(eventData.data?.eventData);    });  }

  /**   * 单次订阅指定事件   */  static onceSubscribe(eventId: EmitterEventId, callback: (data?: Object) => void) {    emitter.once(eventId, (eventData: emitter.EventData) => {      callback(eventData.data?.eventData);    });  }

  /**   * 取消事件订阅   */  static unSubscribe(eventId: EmitterEventId) {    emitter.off(eventId);  }}