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