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Co-Authored-By: 狸花猫/Claude-Qwen3.6-Plus 🐾
117 lines
2.3 KiB
TypeScript
117 lines
2.3 KiB
TypeScript
interface EventType {
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readonly callback: Function;
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readonly once: boolean;
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}
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type EventsType = Record<string, EventType[]>;
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const WILDCARD = '*';
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/* event-emitter */
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export default class EventEmitter {
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private _events: EventsType = {};
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/**
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* 监听一个事件
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* @param evt
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* @param callback
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* @param once
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*/
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on(evt: string, callback: Function, once?: boolean) {
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if (!this._events[evt]) {
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this._events[evt] = [];
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}
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this._events[evt].push({
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callback,
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once: !!once,
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});
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return this;
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}
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/**
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* 监听一个事件一次
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* @param evt
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* @param callback
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*/
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once(evt: string, callback: Function) {
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return this.on(evt, callback, true);
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}
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/**
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* 触发一个事件
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* @param evt
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* @param args
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*/
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emit(evt: string, ...args: any[]) {
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const events = this._events[evt] || [];
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const wildcardEvents = this._events[WILDCARD] || [];
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// 实际的处理 emit 方法
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const doEmit = (es: EventType[]) => {
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let length = es.length;
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for (let i = 0; i < length; i++) {
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if (!es[i]) {
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continue;
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}
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const { callback, once } = es[i];
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if (once) {
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es.splice(i, 1);
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if (es.length === 0) {
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delete this._events[evt];
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}
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length--;
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i--;
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}
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callback.apply(this, args);
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}
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};
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doEmit(events);
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doEmit(wildcardEvents);
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}
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/**
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* 取消监听一个事件，或者一个channel
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* @param evt
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* @param callback
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*/
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off(evt?: string, callback?: Function) {
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if (!evt) {
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// evt 为空全部清除
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this._events = {};
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} else {
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if (!callback) {
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// evt 存在，callback 为空，清除事件所有方法
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delete this._events[evt];
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} else {
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// evt 存在，callback 存在，清除匹配的
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const events = this._events[evt] || [];
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let length = events.length;
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for (let i = 0; i < length; i++) {
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if (events[i].callback === callback) {
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events.splice(i, 1);
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length--;
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i--;
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}
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}
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if (events.length === 0) {
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delete this._events[evt];
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}
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}
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}
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return this;
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}
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/* 当前所有的事件 */
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getEvents() {
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return this._events;
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}
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}
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