87 lines
2.1 KiB
TypeScript
87 lines
2.1 KiB
TypeScript
/**
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* Copyright (c) 2017 The xterm.js authors. All rights reserved.
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* @license MIT
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*/
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import { XtermListener } from './Types';
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import { IEventEmitter, IDisposable } from 'xterm';
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import { Disposable } from './Lifecycle';
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export class EventEmitter extends Disposable implements IEventEmitter, IDisposable {
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private _events: {[type: string]: XtermListener[]};
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constructor() {
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super();
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// Restore the previous events if available, this will happen if the
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// constructor is called multiple times on the same object (terminal reset).
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this._events = (<any>this)._events || {};
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}
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public on(type: string, listener: XtermListener): void {
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this._events[type] = this._events[type] || [];
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this._events[type].push(listener);
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}
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/**
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* Adds a disposable listener to the EventEmitter, returning the disposable.
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* @param type The event type.
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* @param handler The handler for the listener.
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*/
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public addDisposableListener(type: string, handler: XtermListener): IDisposable {
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// TODO: Rename addDisposableEventListener to more easily disambiguate from Dom listener
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this.on(type, handler);
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let disposed = false;
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return {
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dispose: () => {
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if (disposed) {
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// Already disposed
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return;
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}
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this.off(type, handler);
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disposed = true;
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}
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};
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}
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public off(type: string, listener: XtermListener): void {
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if (!this._events[type]) {
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return;
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}
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const obj = this._events[type];
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let i = obj.length;
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while (i--) {
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if (obj[i] === listener) {
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obj.splice(i, 1);
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return;
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}
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}
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}
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public removeAllListeners(type: string): void {
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if (this._events[type]) {
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delete this._events[type];
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}
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}
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public emit(type: string, ...args: any[]): void {
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if (!this._events[type]) {
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return;
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}
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const obj = this._events[type];
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for (let i = 0; i < obj.length; i++) {
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obj[i].apply(this, args);
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}
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}
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public listeners(type: string): XtermListener[] {
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return this._events[type] || [];
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}
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public dispose(): void {
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super.dispose();
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this._events = {};
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}
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}
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