128 lines
4.4 KiB
JavaScript
128 lines
4.4 KiB
JavaScript
"use strict";
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/* --------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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* ------------------------------------------------------------------------------------------ */
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.Emitter = exports.Event = void 0;
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const ral_1 = require("./ral");
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var Event;
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(function (Event) {
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const _disposable = { dispose() { } };
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Event.None = function () { return _disposable; };
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})(Event = exports.Event || (exports.Event = {}));
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class CallbackList {
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add(callback, context = null, bucket) {
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if (!this._callbacks) {
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this._callbacks = [];
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this._contexts = [];
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}
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this._callbacks.push(callback);
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this._contexts.push(context);
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if (Array.isArray(bucket)) {
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bucket.push({ dispose: () => this.remove(callback, context) });
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}
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}
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remove(callback, context = null) {
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if (!this._callbacks) {
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return;
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}
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let foundCallbackWithDifferentContext = false;
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for (let i = 0, len = this._callbacks.length; i < len; i++) {
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if (this._callbacks[i] === callback) {
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if (this._contexts[i] === context) {
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// callback & context match => remove it
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this._callbacks.splice(i, 1);
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this._contexts.splice(i, 1);
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return;
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}
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else {
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foundCallbackWithDifferentContext = true;
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}
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}
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}
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if (foundCallbackWithDifferentContext) {
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throw new Error('When adding a listener with a context, you should remove it with the same context');
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}
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}
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invoke(...args) {
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if (!this._callbacks) {
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return [];
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}
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const ret = [], callbacks = this._callbacks.slice(0), contexts = this._contexts.slice(0);
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for (let i = 0, len = callbacks.length; i < len; i++) {
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try {
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ret.push(callbacks[i].apply(contexts[i], args));
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}
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catch (e) {
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// eslint-disable-next-line no-console
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(0, ral_1.default)().console.error(e);
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}
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}
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return ret;
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}
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isEmpty() {
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return !this._callbacks || this._callbacks.length === 0;
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}
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dispose() {
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this._callbacks = undefined;
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this._contexts = undefined;
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}
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}
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class Emitter {
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constructor(_options) {
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this._options = _options;
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}
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/**
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* For the public to allow to subscribe
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* to events from this Emitter
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*/
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get event() {
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if (!this._event) {
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this._event = (listener, thisArgs, disposables) => {
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if (!this._callbacks) {
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this._callbacks = new CallbackList();
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}
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if (this._options && this._options.onFirstListenerAdd && this._callbacks.isEmpty()) {
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this._options.onFirstListenerAdd(this);
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}
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this._callbacks.add(listener, thisArgs);
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const result = {
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dispose: () => {
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if (!this._callbacks) {
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// disposable is disposed after emitter is disposed.
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return;
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}
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this._callbacks.remove(listener, thisArgs);
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result.dispose = Emitter._noop;
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if (this._options && this._options.onLastListenerRemove && this._callbacks.isEmpty()) {
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this._options.onLastListenerRemove(this);
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}
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}
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};
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if (Array.isArray(disposables)) {
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disposables.push(result);
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}
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return result;
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};
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}
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return this._event;
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}
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/**
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* To be kept private to fire an event to
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* subscribers
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*/
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fire(event) {
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if (this._callbacks) {
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this._callbacks.invoke.call(this._callbacks, event);
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}
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}
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dispose() {
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if (this._callbacks) {
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this._callbacks.dispose();
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this._callbacks = undefined;
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}
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}
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}
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exports.Emitter = Emitter;
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Emitter._noop = function () { };
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