work.suroh.tk/node_modules/rxjs/operators/delay.js

136 lines
5.2 KiB
JavaScript

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