@reactivex/rxjs
Version:
Reactive Extensions for modern JavaScript
84 lines • 3.42 kB
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 Subscriber_1 = require('../Subscriber');
var async_1 = require('../scheduler/async');
/**
* Returns the source Observable delayed by the computed debounce duration,
* with the duration lengthened if a new source item arrives before the delay
* duration ends.
* In practice, for each item emitted on the source, this operator holds the
* latest item, waits for a silence for the `dueTime` length, and only then
* emits the latest source item on the result Observable.
* Optionally takes a scheduler for manging timers.
* @param {number} dueTime the timeout value for the window of time required to not drop the item.
* @param {Scheduler} [scheduler] the Scheduler to use for managing the timers that handle the timeout for each item.
* @return {Observable} an Observable the same as source Observable, but drops items.
* @method debounceTime
* @owner Observable
*/
function debounceTime(dueTime, scheduler) {
if (scheduler === void 0) { scheduler = async_1.async; }
return this.lift(new DebounceTimeOperator(dueTime, scheduler));
}
exports.debounceTime = debounceTime;
var DebounceTimeOperator = (function () {
function DebounceTimeOperator(dueTime, scheduler) {
this.dueTime = dueTime;
this.scheduler = scheduler;
}
DebounceTimeOperator.prototype.call = function (subscriber, source) {
return source._subscribe(new DebounceTimeSubscriber(subscriber, this.dueTime, this.scheduler));
};
return DebounceTimeOperator;
}());
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var DebounceTimeSubscriber = (function (_super) {
__extends(DebounceTimeSubscriber, _super);
function DebounceTimeSubscriber(destination, dueTime, scheduler) {
_super.call(this, destination);
this.dueTime = dueTime;
this.scheduler = scheduler;
this.debouncedSubscription = null;
this.lastValue = null;
this.hasValue = false;
}
DebounceTimeSubscriber.prototype._next = function (value) {
this.clearDebounce();
this.lastValue = value;
this.hasValue = true;
this.add(this.debouncedSubscription = this.scheduler.schedule(dispatchNext, this.dueTime, this));
};
DebounceTimeSubscriber.prototype._complete = function () {
this.debouncedNext();
this.destination.complete();
};
DebounceTimeSubscriber.prototype.debouncedNext = function () {
this.clearDebounce();
if (this.hasValue) {
this.destination.next(this.lastValue);
this.lastValue = null;
this.hasValue = false;
}
};
DebounceTimeSubscriber.prototype.clearDebounce = function () {
var debouncedSubscription = this.debouncedSubscription;
if (debouncedSubscription !== null) {
this.remove(debouncedSubscription);
debouncedSubscription.unsubscribe();
this.debouncedSubscription = null;
}
};
return DebounceTimeSubscriber;
}(Subscriber_1.Subscriber));
function dispatchNext(subscriber) {
subscriber.debouncedNext();
}
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