43 lines
1.5 KiB
JavaScript
43 lines
1.5 KiB
JavaScript
import { asyncScheduler } from '../scheduler/async';
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import { operate } from '../util/lift';
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import { createOperatorSubscriber } from './OperatorSubscriber';
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export function debounceTime(dueTime, scheduler = asyncScheduler) {
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return operate((source, subscriber) => {
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let activeTask = null;
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let lastValue = null;
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let lastTime = null;
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const emit = () => {
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if (activeTask) {
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activeTask.unsubscribe();
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activeTask = null;
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const value = lastValue;
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lastValue = null;
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subscriber.next(value);
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}
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};
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function emitWhenIdle() {
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const targetTime = lastTime + dueTime;
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const now = scheduler.now();
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if (now < targetTime) {
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activeTask = this.schedule(undefined, targetTime - now);
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subscriber.add(activeTask);
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return;
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}
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emit();
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}
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source.subscribe(createOperatorSubscriber(subscriber, (value) => {
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lastValue = value;
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lastTime = scheduler.now();
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if (!activeTask) {
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activeTask = scheduler.schedule(emitWhenIdle, dueTime);
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subscriber.add(activeTask);
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}
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}, () => {
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emit();
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subscriber.complete();
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}, undefined, () => {
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lastValue = activeTask = null;
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}));
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});
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}
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//# sourceMappingURL=debounceTime.js.map
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