87 lines
3.8 KiB
TypeScript
87 lines
3.8 KiB
TypeScript
import { Observable } from '../Observable';
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import { OperatorFunction, SchedulerLike } from '../types';
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/**
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* Branch out the source Observable values as a nested Observable periodically
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* in time.
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*
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* <span class="informal">It's like {@link bufferTime}, but emits a nested
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* Observable instead of an array.</span>
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*
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* 
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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 starts a new window periodically, as
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* determined by the `windowCreationInterval` argument. It emits each window
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* after a fixed timespan, specified by the `windowTimeSpan` argument. When the
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* source Observable completes or encounters an error, the output Observable
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* emits the current window and propagates the notification from the source
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* Observable. If `windowCreationInterval` is not provided, the output
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* Observable starts a new window when the previous window of duration
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* `windowTimeSpan` completes. If `maxWindowCount` is provided, each window
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* will emit at most fixed number of values. Window will complete immediately
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* after emitting last value and next one still will open as specified by
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* `windowTimeSpan` and `windowCreationInterval` arguments.
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*
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* ## Examples
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* In every window of 1 second each, emit at most 2 click events
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* ```ts
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* import { fromEvent } from 'rxjs';
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* import { windowTime, map, mergeAll, take } from 'rxjs/operators';
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*
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* const clicks = fromEvent(document, 'click');
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* const result = clicks.pipe(
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* windowTime(1000),
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* map(win => win.pipe(take(2))), // each window has at most 2 emissions
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* mergeAll(), // flatten the Observable-of-Observables
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* );
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* result.subscribe(x => console.log(x));
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* ```
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*
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* Every 5 seconds start a window 1 second long, and emit at most 2 click events per window
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* ```ts
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* import { fromEvent } from 'rxjs';
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* import { windowTime, map, mergeAll, take } from 'rxjs/operators';
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*
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* const clicks = fromEvent(document, 'click');
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* const result = clicks.pipe(
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* windowTime(1000, 5000),
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* map(win => win.pipe(take(2))), // each window has at most 2 emissions
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* mergeAll(), // flatten the Observable-of-Observables
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* );
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* result.subscribe(x => console.log(x));
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* ```
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*
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* Same as example above but with maxWindowCount instead of take
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* ```ts
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* import { fromEvent } from 'rxjs';
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* import { windowTime, mergeAll } from 'rxjs/operators';
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*
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* const clicks = fromEvent(document, 'click');
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* const result = clicks.pipe(
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* windowTime(1000, 5000, 2), // each window has still at most 2 emissions
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* mergeAll(), // flatten the Observable-of-Observables
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* );
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* result.subscribe(x => console.log(x));
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* ```
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*
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* @see {@link window}
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* @see {@link windowCount}
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* @see {@link windowToggle}
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* @see {@link windowWhen}
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* @see {@link bufferTime}
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*
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* @param {number} windowTimeSpan The amount of time to fill each window.
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* @param {number} [windowCreationInterval] The interval at which to start new
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* windows.
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* @param {number} [maxWindowSize=Number.POSITIVE_INFINITY] Max number of
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* values each window can emit before completion.
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* @param {SchedulerLike} [scheduler=async] The scheduler on which to schedule the
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* intervals that determine window boundaries.
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* @return {Observable<Observable<T>>} An observable of windows, which in turn
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* are Observables.
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* @method windowTime
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* @owner Observable
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*/
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export declare function windowTime<T>(windowTimeSpan: number, scheduler?: SchedulerLike): OperatorFunction<T, Observable<T>>;
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export declare function windowTime<T>(windowTimeSpan: number, windowCreationInterval: number, scheduler?: SchedulerLike): OperatorFunction<T, Observable<T>>;
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export declare function windowTime<T>(windowTimeSpan: number, windowCreationInterval: number, maxWindowSize: number, scheduler?: SchedulerLike): OperatorFunction<T, Observable<T>>;
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