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node_modules/rxjs/_esm2015/operators/debounceTime.js

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+import { Subscriber } from '../Subscriber';
+import { async } from '../scheduler/async';
+/**
+ * Emits a value from the source Observable only after a particular time span
+ * has passed without another source emission.
+ *
+ * <span class="informal">It's like {@link delay}, but passes only the most
+ * recent value from each burst of emissions.</span>
+ *
+ * <img src="./img/debounceTime.png" width="100%">
+ *
+ * `debounceTime` delays values emitted by the source Observable, but drops
+ * previous pending delayed emissions if a new value arrives on the source
+ * Observable. This operator keeps track of the most recent value from the
+ * source Observable, and emits that only when `dueTime` enough time has passed
+ * without any other value appearing on the source Observable. If a new value
+ * appears before `dueTime` silence occurs, the previous value will be dropped
+ * and will not be emitted on the output Observable.
+ *
+ * This is a rate-limiting operator, because it is impossible for more than one
+ * value to be emitted in any time window of duration `dueTime`, but it is also
+ * a delay-like operator since output emissions do not occur at the same time as
+ * they did on the source Observable. Optionally takes a {@link IScheduler} for
+ * managing timers.
+ *
+ * @example <caption>Emit the most recent click after a burst of clicks</caption>
+ * var clicks = Rx.Observable.fromEvent(document, 'click');
+ * var result = clicks.debounceTime(1000);
+ * result.subscribe(x => console.log(x));
+ *
+ * @see {@link auditTime}
+ * @see {@link debounce}
+ * @see {@link delay}
+ * @see {@link sampleTime}
+ * @see {@link throttleTime}
+ *
+ * @param {number} dueTime The timeout duration in milliseconds (or the time
+ * unit determined internally by the optional `scheduler`) for the window of
+ * time required to wait for emission silence before emitting the most recent
+ * source value.
+ * @param {Scheduler} [scheduler=async] The {@link IScheduler} to use for
+ * managing the timers that handle the timeout for each value.
+ * @return {Observable} An Observable that delays the emissions of the source
+ * Observable by the specified `dueTime`, and may drop some values if they occur
+ * too frequently.
+ * @method debounceTime
+ * @owner Observable
+ */
+export function debounceTime(dueTime, scheduler = async) {
+    return (source) => source.lift(new DebounceTimeOperator(dueTime, scheduler));
+}
+class DebounceTimeOperator {
+    constructor(dueTime, scheduler) {
+        this.dueTime = dueTime;
+        this.scheduler = scheduler;
+    }
+    call(subscriber, source) {
+        return source.subscribe(new DebounceTimeSubscriber(subscriber, this.dueTime, this.scheduler));
+    }
+}
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class DebounceTimeSubscriber extends Subscriber {
+    constructor(destination, dueTime, scheduler) {
+        super(destination);
+        this.dueTime = dueTime;
+        this.scheduler = scheduler;
+        this.debouncedSubscription = null;
+        this.lastValue = null;
+        this.hasValue = false;
+    }
+    _next(value) {
+        this.clearDebounce();
+        this.lastValue = value;
+        this.hasValue = true;
+        this.add(this.debouncedSubscription = this.scheduler.schedule(dispatchNext, this.dueTime, this));
+    }
+    _complete() {
+        this.debouncedNext();
+        this.destination.complete();
+    }
+    debouncedNext() {
+        this.clearDebounce();
+        if (this.hasValue) {
+            this.destination.next(this.lastValue);
+            this.lastValue = null;
+            this.hasValue = false;
+        }
+    }
+    clearDebounce() {
+        const debouncedSubscription = this.debouncedSubscription;
+        if (debouncedSubscription !== null) {
+            this.remove(debouncedSubscription);
+            debouncedSubscription.unsubscribe();
+            this.debouncedSubscription = null;
+        }
+    }
+}
+function dispatchNext(subscriber) {
+    subscriber.debouncedNext();
+}
+//# sourceMappingURL=debounceTime.js.map