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52 lines
1.6 KiB
TypeScript
52 lines
1.6 KiB
TypeScript
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
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import * as domTypes from "./dom_types";
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/* TODO: This is an incomplete implementation to provide functionality
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* for Event. A proper spec is still required for a proper Web API.
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*/
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export class EventTarget implements domTypes.EventTarget {
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public listeners: {
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[type in string]: domTypes.EventListenerOrEventListenerObject[]
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} = {};
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public addEventListener(
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type: string,
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listener: domTypes.EventListenerOrEventListenerObject | null,
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_options?: boolean | domTypes.AddEventListenerOptions
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): void {
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if (!(type in this.listeners)) {
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this.listeners[type] = [];
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}
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if (listener !== null) {
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this.listeners[type].push(listener);
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}
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}
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public removeEventListener(
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type: string,
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callback: domTypes.EventListenerOrEventListenerObject | null,
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_options?: domTypes.EventListenerOptions | boolean
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): void {
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if (type in this.listeners && callback !== null) {
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this.listeners[type] = this.listeners[type].filter(
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listener => listener !== callback
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);
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}
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}
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public dispatchEvent(event: domTypes.Event): boolean {
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if (!(event.type in this.listeners)) {
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return true;
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}
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const stack = this.listeners[event.type].slice();
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for (const stackElement of stack) {
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if ((stackElement as domTypes.EventListenerObject).handleEvent) {
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(stackElement as domTypes.EventListenerObject).handleEvent(event);
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} else {
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(stackElement as domTypes.EventListener).call(this, event);
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}
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}
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return !event.defaultPrevented;
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}
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}
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