68 lines
2.1 KiB
JavaScript
68 lines
2.1 KiB
JavaScript
|
import { SimpleOuterSubscriber, innerSubscribe, SimpleInnerSubscriber } from '../innerSubscribe';
|
||
|
|
export function debounce(durationSelector) {
|
||
|
|
return (source) => source.lift(new DebounceOperator(durationSelector));
|
||
|
|
}
|
||
|
|
class DebounceOperator {
|
||
|
|
constructor(durationSelector) {
|
||
|
|
this.durationSelector = durationSelector;
|
||
|
|
}
|
||
|
|
call(subscriber, source) {
|
||
|
|
return source.subscribe(new DebounceSubscriber(subscriber, this.durationSelector));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
class DebounceSubscriber extends SimpleOuterSubscriber {
|
||
|
|
constructor(destination, durationSelector) {
|
||
|
|
super(destination);
|
||
|
|
this.durationSelector = durationSelector;
|
||
|
|
this.hasValue = false;
|
||
|
|
}
|
||
|
|
_next(value) {
|
||
|
|
try {
|
||
|
|
const result = this.durationSelector.call(this, value);
|
||
|
|
if (result) {
|
||
|
|
this._tryNext(value, result);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
catch (err) {
|
||
|
|
this.destination.error(err);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
_complete() {
|
||
|
|
this.emitValue();
|
||
|
|
this.destination.complete();
|
||
|
|
}
|
||
|
|
_tryNext(value, duration) {
|
||
|
|
let subscription = this.durationSubscription;
|
||
|
|
this.value = value;
|
||
|
|
this.hasValue = true;
|
||
|
|
if (subscription) {
|
||
|
|
subscription.unsubscribe();
|
||
|
|
this.remove(subscription);
|
||
|
|
}
|
||
|
|
subscription = innerSubscribe(duration, new SimpleInnerSubscriber(this));
|
||
|
|
if (subscription && !subscription.closed) {
|
||
|
|
this.add(this.durationSubscription = subscription);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
notifyNext() {
|
||
|
|
this.emitValue();
|
||
|
|
}
|
||
|
|
notifyComplete() {
|
||
|
|
this.emitValue();
|
||
|
|
}
|
||
|
|
emitValue() {
|
||
|
|
if (this.hasValue) {
|
||
|
|
const value = this.value;
|
||
|
|
const subscription = this.durationSubscription;
|
||
|
|
if (subscription) {
|
||
|
|
this.durationSubscription = undefined;
|
||
|
|
subscription.unsubscribe();
|
||
|
|
this.remove(subscription);
|
||
|
|
}
|
||
|
|
this.value = undefined;
|
||
|
|
this.hasValue = false;
|
||
|
|
super._next(value);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
//# sourceMappingURL=debounce.js.map
|