43 lines
1.5 KiB
JavaScript
43 lines
1.5 KiB
JavaScript
|
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;
|
||
|
|
}));
|
||
|
|
});
|
||
|
|
}
|
||
|
|
//# sourceMappingURL=debounceTime.js.map
|