65 lines
2.2 KiB
JavaScript
65 lines
2.2 KiB
JavaScript
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import { OuterSubscriber } from '../OuterSubscriber';
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import { subscribeToResult } from '../util/subscribeToResult';
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/**
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* Emits the values emitted by the source Observable until a `notifier`
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* Observable emits a value.
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*
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* <span class="informal">Lets values pass until a second Observable,
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* `notifier`, emits something. Then, it completes.</span>
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*
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* <img src="./img/takeUntil.png" width="100%">
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*
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* `takeUntil` subscribes and begins mirroring the source Observable. It also
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* monitors a second Observable, `notifier` that you provide. If the `notifier`
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* emits a value or a complete notification, the output Observable stops
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* mirroring the source Observable and completes.
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*
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* @example <caption>Tick every second until the first click happens</caption>
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* var interval = Rx.Observable.interval(1000);
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* var clicks = Rx.Observable.fromEvent(document, 'click');
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* var result = interval.takeUntil(clicks);
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* result.subscribe(x => console.log(x));
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*
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* @see {@link take}
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* @see {@link takeLast}
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* @see {@link takeWhile}
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* @see {@link skip}
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*
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* @param {Observable} notifier The Observable whose first emitted value will
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* cause the output Observable of `takeUntil` to stop emitting values from the
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* source Observable.
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* @return {Observable<T>} An Observable that emits the values from the source
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* Observable until such time as `notifier` emits its first value.
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* @method takeUntil
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* @owner Observable
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*/
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export function takeUntil(notifier) {
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return (source) => source.lift(new TakeUntilOperator(notifier));
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}
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class TakeUntilOperator {
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constructor(notifier) {
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this.notifier = notifier;
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}
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call(subscriber, source) {
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return source.subscribe(new TakeUntilSubscriber(subscriber, this.notifier));
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}
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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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class TakeUntilSubscriber extends OuterSubscriber {
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constructor(destination, notifier) {
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super(destination);
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this.notifier = notifier;
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this.add(subscribeToResult(this, notifier));
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}
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notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
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this.complete();
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}
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notifyComplete() {
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// noop
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}
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}
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//# sourceMappingURL=takeUntil.js.map
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