120 lines
4.8 KiB
JavaScript
Executable File
120 lines
4.8 KiB
JavaScript
Executable File
/** PURE_IMPORTS_START .._Subscriber,.._scheduler_async PURE_IMPORTS_END */
|
|
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 __());
|
|
};
|
|
import { Subscriber } from '../Subscriber';
|
|
import { async } from '../scheduler/async';
|
|
/**
|
|
* Emits a value from the source Observable only after a particular time span
|
|
* has passed without another source emission.
|
|
*
|
|
* <span class="informal">It's like {@link delay}, but passes only the most
|
|
* recent value from each burst of emissions.</span>
|
|
*
|
|
* <img src="./img/debounceTime.png" width="100%">
|
|
*
|
|
* `debounceTime` delays values emitted by the source Observable, but drops
|
|
* previous pending delayed emissions if a new value arrives on the source
|
|
* Observable. This operator keeps track of the most recent value from the
|
|
* source Observable, and emits that only when `dueTime` enough time has passed
|
|
* without any other value appearing on the source Observable. If a new value
|
|
* appears before `dueTime` silence occurs, the previous value will be dropped
|
|
* and will not be emitted on the output Observable.
|
|
*
|
|
* This is a rate-limiting operator, because it is impossible for more than one
|
|
* value to be emitted in any time window of duration `dueTime`, but it is also
|
|
* a delay-like operator since output emissions do not occur at the same time as
|
|
* they did on the source Observable. Optionally takes a {@link IScheduler} for
|
|
* managing timers.
|
|
*
|
|
* @example <caption>Emit the most recent click after a burst of clicks</caption>
|
|
* var clicks = Rx.Observable.fromEvent(document, 'click');
|
|
* var result = clicks.debounceTime(1000);
|
|
* result.subscribe(x => console.log(x));
|
|
*
|
|
* @see {@link auditTime}
|
|
* @see {@link debounce}
|
|
* @see {@link delay}
|
|
* @see {@link sampleTime}
|
|
* @see {@link throttleTime}
|
|
*
|
|
* @param {number} dueTime The timeout duration in milliseconds (or the time
|
|
* unit determined internally by the optional `scheduler`) for the window of
|
|
* time required to wait for emission silence before emitting the most recent
|
|
* source value.
|
|
* @param {Scheduler} [scheduler=async] The {@link IScheduler} to use for
|
|
* managing the timers that handle the timeout for each value.
|
|
* @return {Observable} An Observable that delays the emissions of the source
|
|
* Observable by the specified `dueTime`, and may drop some values if they occur
|
|
* too frequently.
|
|
* @method debounceTime
|
|
* @owner Observable
|
|
*/
|
|
export function debounceTime(dueTime, scheduler) {
|
|
if (scheduler === void 0) {
|
|
scheduler = async;
|
|
}
|
|
return function (source) { return source.lift(new DebounceTimeOperator(dueTime, scheduler)); };
|
|
}
|
|
var DebounceTimeOperator = /*@__PURE__*/ (/*@__PURE__*/ 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 = /*@__PURE__*/ (/*@__PURE__*/ 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));
|
|
function dispatchNext(subscriber) {
|
|
subscriber.debouncedNext();
|
|
}
|
|
//# sourceMappingURL=debounceTime.js.map
|