136 lines
5.2 KiB
JavaScript
136 lines
5.2 KiB
JavaScript
"use strict";
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var __extends = (this && this.__extends) || function (d, b) {
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for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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var async_1 = require('../scheduler/async');
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var isDate_1 = require('../util/isDate');
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var Subscriber_1 = require('../Subscriber');
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var Notification_1 = require('../Notification');
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/**
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* Delays the emission of items from the source Observable by a given timeout or
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* until a given Date.
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*
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* <span class="informal">Time shifts each item by some specified amount of
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* milliseconds.</span>
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*
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* <img src="./img/delay.png" width="100%">
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*
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* If the delay argument is a Number, this operator time shifts the source
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* Observable by that amount of time expressed in milliseconds. The relative
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* time intervals between the values are preserved.
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*
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* If the delay argument is a Date, this operator time shifts the start of the
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* Observable execution until the given date occurs.
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*
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* @example <caption>Delay each click by one second</caption>
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* var clicks = Rx.Observable.fromEvent(document, 'click');
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* var delayedClicks = clicks.delay(1000); // each click emitted after 1 second
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* delayedClicks.subscribe(x => console.log(x));
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*
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* @example <caption>Delay all clicks until a future date happens</caption>
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* var clicks = Rx.Observable.fromEvent(document, 'click');
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* var date = new Date('March 15, 2050 12:00:00'); // in the future
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* var delayedClicks = clicks.delay(date); // click emitted only after that date
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* delayedClicks.subscribe(x => console.log(x));
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*
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* @see {@link debounceTime}
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* @see {@link delayWhen}
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*
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* @param {number|Date} delay The delay duration in milliseconds (a `number`) or
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* a `Date` until which the emission of the source items is delayed.
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* @param {Scheduler} [scheduler=async] The IScheduler to use for
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* managing the timers that handle the time-shift for each item.
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* @return {Observable} An Observable that delays the emissions of the source
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* Observable by the specified timeout or Date.
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* @method delay
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* @owner Observable
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*/
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function delay(delay, scheduler) {
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if (scheduler === void 0) { scheduler = async_1.async; }
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var absoluteDelay = isDate_1.isDate(delay);
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var delayFor = absoluteDelay ? (+delay - scheduler.now()) : Math.abs(delay);
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return function (source) { return source.lift(new DelayOperator(delayFor, scheduler)); };
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}
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exports.delay = delay;
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var DelayOperator = (function () {
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function DelayOperator(delay, scheduler) {
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this.delay = delay;
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this.scheduler = scheduler;
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}
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DelayOperator.prototype.call = function (subscriber, source) {
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return source.subscribe(new DelaySubscriber(subscriber, this.delay, this.scheduler));
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};
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return DelayOperator;
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}());
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/**
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* We need this JSDoc comment for affecting ESDoc.
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* @ignore
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* @extends {Ignored}
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*/
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var DelaySubscriber = (function (_super) {
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__extends(DelaySubscriber, _super);
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function DelaySubscriber(destination, delay, scheduler) {
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_super.call(this, destination);
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this.delay = delay;
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this.scheduler = scheduler;
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this.queue = [];
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this.active = false;
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this.errored = false;
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}
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DelaySubscriber.dispatch = function (state) {
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var source = state.source;
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var queue = source.queue;
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var scheduler = state.scheduler;
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var destination = state.destination;
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while (queue.length > 0 && (queue[0].time - scheduler.now()) <= 0) {
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queue.shift().notification.observe(destination);
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}
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if (queue.length > 0) {
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var delay_1 = Math.max(0, queue[0].time - scheduler.now());
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this.schedule(state, delay_1);
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}
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else {
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this.unsubscribe();
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source.active = false;
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}
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};
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DelaySubscriber.prototype._schedule = function (scheduler) {
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this.active = true;
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this.add(scheduler.schedule(DelaySubscriber.dispatch, this.delay, {
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source: this, destination: this.destination, scheduler: scheduler
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}));
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};
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DelaySubscriber.prototype.scheduleNotification = function (notification) {
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if (this.errored === true) {
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return;
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}
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var scheduler = this.scheduler;
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var message = new DelayMessage(scheduler.now() + this.delay, notification);
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this.queue.push(message);
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if (this.active === false) {
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this._schedule(scheduler);
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}
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};
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DelaySubscriber.prototype._next = function (value) {
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this.scheduleNotification(Notification_1.Notification.createNext(value));
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};
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DelaySubscriber.prototype._error = function (err) {
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this.errored = true;
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this.queue = [];
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this.destination.error(err);
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};
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DelaySubscriber.prototype._complete = function () {
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this.scheduleNotification(Notification_1.Notification.createComplete());
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};
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return DelaySubscriber;
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}(Subscriber_1.Subscriber));
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var DelayMessage = (function () {
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function DelayMessage(time, notification) {
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this.time = time;
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this.notification = notification;
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}
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return DelayMessage;
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}());
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//# sourceMappingURL=delay.js.map
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