Cocos Creator中使用事件中心

export class EventCenter {
/** 监听数组 */
private listeners = {};

/**
* 注册事件
* @param name 事件名称
* @param callback 回调函数
* @param context 上下文
*/
public register(name: string, callback: Function, context: any) {
let observers: Observer[] = this.listeners[name];
if (!observers) {
this.listeners[name] = [];
}
this.listeners[name].push(new Observer(callback, context));
}

/**
* 移除事件
* @param name 事件名称
* @param callback 回调函数
* @param context 上下文
*/
public remove(name: string, context: any) {
let observers: Observer[] = this.listeners[name];
if (!observers) return;
let length = observers.length;
for (let i = 0; i < length; i++) {
let observer = observers[i];
if (observer.compar(context)) {
observers.splice(i, 1);
break;
}
}
if (observers.length == 0) {
delete this.listeners[name];
}
}

/**
* 发送事件
* @param name 事件名称
*/
public fire(name: string, ...args: any[]) {
let observers: Observer[] = this.listeners[name];
if (!observers) return;
let length = observers.length;
for (let i = 0; i < length; i++) {
let observer = observers[i];
observer.notify(name, ...args);
}
}
}

/**
* 观察者
*/
export class Observer {
/** 回调函数 */
private callback: Function = null;
/** 上下文 */
private context: any = null;

constructor(callback: Function, context: any) {
let self = this;
self.callback = callback;
self.context = context;
}

/**
* 发送通知
* @param args 不定参数
*/
notify(...args: any[]): void {
let self = this;
self.callback.call(self.context, ...args);
}

/**
* 上下文比较
* @param context 上下文
*/
compar(context: any): boolean {
return context == this.context;
}
}