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events.ts
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events.ts
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/*
* Node Web Bluetooth
* Copyright (c) 2019 Rob Moran
*
* The MIT License (MIT)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
import { EventEmitter } from 'events';
/**
* @hidden
*/
export class EventDispatcher<T> {
protected emitter = new EventEmitter();
// eslint-disable-next-line @typescript-eslint/no-explicit-any
private isEventListenerObject = (listener: any): listener is EventListenerObject => (listener as EventListenerObject).handleEvent !== undefined;
public addEventListener<K extends keyof T>(type: K, listener: (this: this, ev: T[K]) => void): void;
public addEventListener<K extends keyof T>(type: K, listener: EventListener): void;
public addEventListener<K extends keyof T>(type: string, listener: EventListener | ((ev: T[K]) => void)): void {
if (listener) {
const handler = this.isEventListenerObject(listener) ? listener.handleEvent : listener;
this.emitter.addListener(type, handler);
}
}
public removeEventListener<K extends keyof T>(type: K, callback: (this: this, ev: T[K]) => void): void;
public removeEventListener<K extends keyof T>(type: K, callback: EventListener): void;
public removeEventListener<K extends keyof T>(type: K, callback: EventListener | ((ev: T[K]) => void)): void {
if (callback) {
const handler = this.isEventListenerObject(callback) ? callback.handleEvent : callback;
this.emitter.removeListener(type as string, handler);
}
}
public dispatchEvent(event: Event): boolean {
return this.emitter.emit(event.type, event);
}
}
/**
* @hidden
*/
export class DOMEvent implements Event {
/**
* Type of the event
*/
public type: string;
/**
* @hidden
*/
public target: EventTarget;
/**
* @hidden
*/
public currentTarget: EventTarget;
/**
* @hidden
*/
public srcElement: EventTarget;
/**
* @hidden
*/
public timeStamp: number;
/**
* @hidden
*/
public bubbles = true;
/**
* @hidden
*/
public cancelable = false;
/**
* @hidden
*/
public cancelBubble = false;
/**
* @hidden
*/
public composed = false;
/**
* @hidden
*/
public defaultPrevented = false;
/**
* @hidden
*/
public eventPhase = 0;
/**
* @hidden
*/
public isTrusted = true;
/**
* @hidden
*/
public returnValue = true;
/**
* @hidden
*/
public AT_TARGET: number;
/**
* @hidden
*/
public BUBBLING_PHASE: number;
/**
* @hidden
*/
public CAPTURING_PHASE: number;
/**
* @hidden
*/
public NONE: number;
constructor(target: EventTarget, type: string) {
this.target = target;
this.srcElement = target;
this.currentTarget = target;
this.type = type;
}
/**
* @hidden
*/
public composedPath(): Array<EventTarget> {
return [];
}
/**
* @hidden
*/
public initEvent(type: string, bubbles?: boolean, cancelable?: boolean): void {
this.type = type;
this.bubbles = bubbles;
this.cancelable = cancelable;
}
/**
* @hidden
*/
public preventDefault(): void {
this.defaultPrevented = true;
}
/**
* @hidden
*/
public stopImmediatePropagation(): void {
return;
}
/**
* @hidden
*/
public stopPropagation(): void {
return;
}
}