82 lines
2.2 KiB
TypeScript
82 lines
2.2 KiB
TypeScript
/**
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* 用于包装事件的一个小类
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*/
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export class FuncPack<TContext = unknown> {
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/** 函数 */
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public func: Function;
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/** 上下文 */
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public context: TContext;
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constructor(func: Function, context: TContext) {
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this.func = func;
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this.context = context;
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}
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}
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/**
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* 用于事件管理
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*/
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export class Emitter<T, TContext = unknown> {
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private _messageTable: Map<T, FuncPack<TContext>[]>;
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constructor() {
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this._messageTable = new Map<T, FuncPack<TContext>[]>();
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}
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/**
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* 开始监听项
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* @param eventType 监听类型
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* @param handler 监听函数
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* @param context 监听上下文
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*/
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public addObserver(eventType: T, handler: Function, context: TContext) {
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let list = this._messageTable.get(eventType);
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if (!list) {
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list = [];
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this._messageTable.set(eventType, list);
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}
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if (!this.hasObserver(eventType, handler)) {
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list.push(new FuncPack<TContext>(handler, context));
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}
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}
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/**
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* 移除监听项
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* @param eventType 事件类型
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* @param handler 事件函数
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*/
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public removeObserver(eventType: T, handler: Function) {
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let messageData = this._messageTable.get(eventType);
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if (messageData) {
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let index = messageData.findIndex(data => data.func == handler);
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if (index != -1)
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messageData.splice(index, 1);
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}
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}
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/**
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* 触发该事件
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* @param eventType 事件类型
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* @param data 事件数据
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*/
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public emit<TData = unknown>(eventType: T, ...data: TData[]) {
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let list = this._messageTable.get(eventType);
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if (list) {
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for (let observer of list) {
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observer.func.call(observer.context, ...data);
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}
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}
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}
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/**
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* 判断是否存在该类型的观察者
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* @param eventType 事件类型
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* @param handler 事件函数
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*/
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public hasObserver(eventType: T, handler: Function): boolean {
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let list = this._messageTable.get(eventType);
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return list ? list.some(observer => observer.func === handler) : false;
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}
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}
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