49 lines
1.1 KiB
Plaintext
49 lines
1.1 KiB
Plaintext
/**
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* Copyright (c) 2019, Microsoft Corporation (MIT License).
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*/
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import { IDisposable } from './types';
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interface IListener<T> {
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(e: T): void;
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}
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export interface IEvent<T> {
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(listener: (e: T) => any): IDisposable;
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}
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export class EventEmitter2<T> {
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private _listeners: Array<IListener<T>> = [];
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private _event?: IEvent<T>;
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public get event(): IEvent<T> {
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if (!this._event) {
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this._event = (listener: (e: T) => any) => {
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this._listeners.push(listener);
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const disposable = {
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dispose: () => {
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for (let i = 0; i < this._listeners.length; i++) {
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if (this._listeners[i] === listener) {
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this._listeners.splice(i, 1);
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return;
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}
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}
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}
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};
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return disposable;
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};
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}
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return this._event;
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}
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public fire(data: T): void {
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const queue: Array<IListener<T>> = [];
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for (let i = 0; i < this._listeners.length; i++) {
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queue.push(this._listeners[i]);
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}
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for (let i = 0; i < queue.length; i++) {
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queue[i].call(undefined, data);
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}
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}
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}
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