90 lines
3.5 KiB
JavaScript
90 lines
3.5 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 OuterSubscriber_1 = require('../OuterSubscriber');
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var subscribeToResult_1 = require('../util/subscribeToResult');
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/**
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* Returns the source Observable delayed by the computed debounce duration,
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* with the duration lengthened if a new source item arrives before the delay
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* duration ends.
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* In practice, for each item emitted on the source, this operator holds the
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* latest item, waits for a silence as long as the `durationSelector` specifies,
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* and only then emits the latest source item on the result Observable.
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* @param {function} durationSelector function for computing the timeout duration for each item.
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* @returns {Observable} an Observable the same as source Observable, but drops items.
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*/
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function debounce(durationSelector) {
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return this.lift(new DebounceOperator(durationSelector));
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}
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exports.debounce = debounce;
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var DebounceOperator = (function () {
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function DebounceOperator(durationSelector) {
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this.durationSelector = durationSelector;
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}
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DebounceOperator.prototype.call = function (subscriber) {
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return new DebounceSubscriber(subscriber, this.durationSelector);
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};
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return DebounceOperator;
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}());
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var DebounceSubscriber = (function (_super) {
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__extends(DebounceSubscriber, _super);
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function DebounceSubscriber(destination, durationSelector) {
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_super.call(this, destination);
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this.durationSelector = durationSelector;
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this.hasValue = false;
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this.durationSubscription = null;
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}
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DebounceSubscriber.prototype._next = function (value) {
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try {
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var result = this.durationSelector.call(this, value);
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if (result) {
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this._tryNext(value, result);
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}
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}
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catch (err) {
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this.destination.error(err);
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}
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};
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DebounceSubscriber.prototype._complete = function () {
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this.emitValue();
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this.destination.complete();
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};
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DebounceSubscriber.prototype._tryNext = function (value, duration) {
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var subscription = this.durationSubscription;
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this.value = value;
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this.hasValue = true;
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if (subscription) {
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subscription.unsubscribe();
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this.remove(subscription);
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}
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subscription = subscribeToResult_1.subscribeToResult(this, duration);
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if (!subscription.isUnsubscribed) {
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this.add(this.durationSubscription = subscription);
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}
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};
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DebounceSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
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this.emitValue();
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};
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DebounceSubscriber.prototype.notifyComplete = function () {
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this.emitValue();
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};
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DebounceSubscriber.prototype.emitValue = function () {
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if (this.hasValue) {
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var value = this.value;
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var subscription = this.durationSubscription;
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if (subscription) {
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this.durationSubscription = null;
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subscription.unsubscribe();
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this.remove(subscription);
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}
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this.value = null;
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this.hasValue = false;
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_super.prototype._next.call(this, value);
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}
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};
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return DebounceSubscriber;
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}(OuterSubscriber_1.OuterSubscriber));
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//# sourceMappingURL=debounce.js.map
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