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40 lines
1.6 KiB
40 lines
1.6 KiB
2 years ago
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import { Observable } from '../Observable';
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import { OperatorFunction } from '../interfaces';
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/**
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* Branch out the source Observable values as a nested Observable whenever
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* `windowBoundaries` emits.
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*
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* <span class="informal">It's like {@link buffer}, but emits a nested Observable
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* instead of an array.</span>
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*
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* <img src="./img/window.png" width="100%">
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*
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* Returns an Observable that emits windows of items it collects from the source
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* Observable. The output Observable emits connected, non-overlapping
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* windows. It emits the current window and opens a new one whenever the
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* Observable `windowBoundaries` emits an item. Because each window is an
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* Observable, the output is a higher-order Observable.
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*
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* @example <caption>In every window of 1 second each, emit at most 2 click events</caption>
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* var clicks = Rx.Observable.fromEvent(document, 'click');
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* var interval = Rx.Observable.interval(1000);
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* var result = clicks.window(interval)
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* .map(win => win.take(2)) // each window has at most 2 emissions
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* .mergeAll(); // flatten the Observable-of-Observables
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* result.subscribe(x => console.log(x));
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*
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* @see {@link windowCount}
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* @see {@link windowTime}
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* @see {@link windowToggle}
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* @see {@link windowWhen}
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* @see {@link buffer}
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*
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* @param {Observable<any>} windowBoundaries An Observable that completes the
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* previous window and starts a new window.
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* @return {Observable<Observable<T>>} An Observable of windows, which are
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* Observables emitting values of the source Observable.
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* @method window
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* @owner Observable
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*/
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export declare function window<T>(windowBoundaries: Observable<any>): OperatorFunction<T, Observable<T>>;
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