116 lines
4.7 KiB
JavaScript
116 lines
4.7 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 Subscriber_1 = require('../Subscriber');
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var async_1 = require('../scheduler/async');
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var throttle_1 = require('./throttle');
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/**
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* Emits a value from the source Observable, then ignores subsequent source
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* values for `duration` milliseconds, then repeats this process.
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*
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* <span class="informal">Lets a value pass, then ignores source values for the
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* next `duration` milliseconds.</span>
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*
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* <img src="./img/throttleTime.png" width="100%">
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*
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* `throttleTime` emits the source Observable values on the output Observable
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* when its internal timer is disabled, and ignores source values when the timer
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* is enabled. Initially, the timer is disabled. As soon as the first source
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* value arrives, it is forwarded to the output Observable, and then the timer
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* is enabled. After `duration` milliseconds (or the time unit determined
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* internally by the optional `scheduler`) has passed, the timer is disabled,
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* and this process repeats for the next source value. Optionally takes a
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* {@link IScheduler} for managing timers.
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*
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* @example <caption>Emit clicks at a rate of at most one click per second</caption>
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* var clicks = Rx.Observable.fromEvent(document, 'click');
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* var result = clicks.throttleTime(1000);
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* result.subscribe(x => console.log(x));
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*
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* @see {@link auditTime}
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* @see {@link debounceTime}
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* @see {@link delay}
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* @see {@link sampleTime}
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* @see {@link throttle}
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*
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* @param {number} duration Time to wait before emitting another value after
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* emitting the last value, measured in milliseconds or the time unit determined
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* internally by the optional `scheduler`.
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* @param {Scheduler} [scheduler=async] The {@link IScheduler} to use for
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* managing the timers that handle the throttling.
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* @return {Observable<T>} An Observable that performs the throttle operation to
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* limit the rate of emissions from the source.
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* @method throttleTime
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* @owner Observable
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*/
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function throttleTime(duration, scheduler, config) {
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if (scheduler === void 0) { scheduler = async_1.async; }
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if (config === void 0) { config = throttle_1.defaultThrottleConfig; }
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return function (source) { return source.lift(new ThrottleTimeOperator(duration, scheduler, config.leading, config.trailing)); };
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}
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exports.throttleTime = throttleTime;
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var ThrottleTimeOperator = (function () {
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function ThrottleTimeOperator(duration, scheduler, leading, trailing) {
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this.duration = duration;
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this.scheduler = scheduler;
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this.leading = leading;
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this.trailing = trailing;
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}
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ThrottleTimeOperator.prototype.call = function (subscriber, source) {
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return source.subscribe(new ThrottleTimeSubscriber(subscriber, this.duration, this.scheduler, this.leading, this.trailing));
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};
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return ThrottleTimeOperator;
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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 ThrottleTimeSubscriber = (function (_super) {
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__extends(ThrottleTimeSubscriber, _super);
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function ThrottleTimeSubscriber(destination, duration, scheduler, leading, trailing) {
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_super.call(this, destination);
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this.duration = duration;
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this.scheduler = scheduler;
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this.leading = leading;
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this.trailing = trailing;
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this._hasTrailingValue = false;
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this._trailingValue = null;
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}
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ThrottleTimeSubscriber.prototype._next = function (value) {
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if (this.throttled) {
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if (this.trailing) {
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this._trailingValue = value;
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this._hasTrailingValue = true;
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}
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}
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else {
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this.add(this.throttled = this.scheduler.schedule(dispatchNext, this.duration, { subscriber: this }));
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if (this.leading) {
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this.destination.next(value);
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}
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}
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};
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ThrottleTimeSubscriber.prototype.clearThrottle = function () {
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var throttled = this.throttled;
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if (throttled) {
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if (this.trailing && this._hasTrailingValue) {
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this.destination.next(this._trailingValue);
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this._trailingValue = null;
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this._hasTrailingValue = false;
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}
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throttled.unsubscribe();
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this.remove(throttled);
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this.throttled = null;
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}
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};
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return ThrottleTimeSubscriber;
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}(Subscriber_1.Subscriber));
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function dispatchNext(arg) {
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var subscriber = arg.subscriber;
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subscriber.clearThrottle();
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}
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//# sourceMappingURL=throttleTime.js.map
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