Cocos Creator中使用事件中心

1export class EventCenter {
2    /** 监听数组 */
3    private listeners = {};
4
5    /** 
6    * 注册事件
7    * @param name 事件名称
8    * @param callback 回调函数
9    * @param context 上下文
10    */
11    public register(name: string, callback: Function, context: any) {
12        let observers: Observer[] = this.listeners[name];
13        if (!observers) {
14            this.listeners[name] = [];
15        }
16        this.listeners[name].push(new Observer(callback, context));
17    }
18
19    /**
20    * 移除事件
21    * @param name 事件名称
22    * @param callback 回调函数
23    * @param context 上下文
24    */
25    public remove(name: string, context: any) {
26        let observers: Observer[] = this.listeners[name];
27        if (!observers) return;
28        let length = observers.length;
29        for (let i = 0; i < length; i++) {
30            let observer = observers[i];
31            if (observer.compar(context)) {
32                observers.splice(i, 1);
33                break;
34            }
35        }
36        if (observers.length == 0) {
37            delete this.listeners[name];
38        }
39    }
40
41    /**
42    * 发送事件
43    * @param name 事件名称
44    */
45    public fire(name: string, ...args: any[]) {
46        let observers: Observer[] = this.listeners[name];
47        if (!observers) return;
48        let length = observers.length;
49        for (let i = 0; i < length; i++) {
50            let observer = observers[i];
51            observer.notify(name, ...args);
52        }
53    }
54}
55
56/*************************************************************/
57
58/**
59* 观察者
60*/
61export class Observer {
62    /** 回调函数 */
63    private callback: Function = null;
64    /** 上下文 */
65    private context: any = null;
66
67    constructor(callback: Function, context: any) {
68        let self = this;
69        self.callback = callback;
70        self.context = context;
71    }
72
73    /**
74    * 发送通知
75    * @param args 不定参数
76    */
77    notify(...args: any[]): void {
78        let self = this;
79        self.callback.call(self.context, ...args);
80    }
81
82    /**
83    * 上下文比较
84    * @param context 上下文
85    */
86    compar(context: any): boolean {
87        return context == this.context;
88    }
89}