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37 lines
880 B
JavaScript
37 lines
880 B
JavaScript
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/**
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* @abstract
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* @implements {EventTarget}
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*/
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export class AbstractEventTarget {
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constructor() {
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this.listeners = {};
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}
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addEventListener(type, callback, _options) {
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if (!this.listeners[type]) {
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this.listeners[type] = [];
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}
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this.listeners[type].push(callback);
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}
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dispatchEvent(event) {
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if (!this.listeners[event.type] || this.listeners[event.type].length === 0) {
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return true;
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}
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this.listeners[event.type].forEach(listener => {
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listener(event);
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});
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return true;
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}
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removeEventListener(type, callback, _options) {
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if (!this.listeners[type]) {
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return;
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}
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const index = this.listeners[type].indexOf(callback);
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if (index !== -1) {
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this.listeners[type].splice(index, 1);
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}
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}
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}
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