12345678910111213141516171819202122232425262728293031323334353637383940414243 |
- import { asyncScheduler } from '../scheduler/async';
- import { operate } from '../util/lift';
- import { createOperatorSubscriber } from './OperatorSubscriber';
- export function debounceTime(dueTime, scheduler = asyncScheduler) {
- return operate((source, subscriber) => {
- let activeTask = null;
- let lastValue = null;
- let lastTime = null;
- const emit = () => {
- if (activeTask) {
- activeTask.unsubscribe();
- activeTask = null;
- const value = lastValue;
- lastValue = null;
- subscriber.next(value);
- }
- };
- function emitWhenIdle() {
- const targetTime = lastTime + dueTime;
- const now = scheduler.now();
- if (now < targetTime) {
- activeTask = this.schedule(undefined, targetTime - now);
- subscriber.add(activeTask);
- return;
- }
- emit();
- }
- source.subscribe(createOperatorSubscriber(subscriber, (value) => {
- lastValue = value;
- lastTime = scheduler.now();
- if (!activeTask) {
- activeTask = scheduler.schedule(emitWhenIdle, dueTime);
- subscriber.add(activeTask);
- }
- }, () => {
- emit();
- subscriber.complete();
- }, undefined, () => {
- lastValue = activeTask = null;
- }));
- });
- }
|