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106 lines
3.0 KiB
106 lines
3.0 KiB
var WILDCARD = '*';
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/* event-emitter */
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var EventEmitter = /** @class */ (function () {
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function EventEmitter() {
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this._events = {};
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}
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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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EventEmitter.prototype.on = function (evt, callback, once) {
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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: 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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EventEmitter.prototype.once = function (evt, callback) {
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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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EventEmitter.prototype.emit = function (evt) {
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var _this = this;
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var args = [];
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for (var _i = 1; _i < arguments.length; _i++) {
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args[_i - 1] = arguments[_i];
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}
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var events = this._events[evt] || [];
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var wildcardEvents = this._events[WILDCARD] || [];
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// 实际的处理 emit 方法
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var doEmit = function (es) {
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var length = es.length;
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for (var 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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var _a = es[i], callback = _a.callback, once = _a.once;
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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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EventEmitter.prototype.off = function (evt, callback) {
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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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}
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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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}
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else {
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// evt 存在，callback 存在，清除匹配的
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var events = this._events[evt] || [];
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var length_1 = events.length;
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for (var i = 0; i < length_1; i++) {
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if (events[i].callback === callback) {
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events.splice(i, 1);
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length_1--;
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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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EventEmitter.prototype.getEvents = function () {
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return this._events;
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};
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return EventEmitter;
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}());
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export default EventEmitter;
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//# sourceMappingURL=index.js.map
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