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The value is emitted only when the duration\n * Observable emits a value or completes, and if no other value was emitted on\n * the source Observable since the duration Observable was spawned. If a new\n * value appears before the duration Observable emits, the previous value will\n * be dropped and will not be emitted on the output Observable.\n *\n * Like {@link debounceTime}, this is a rate-limiting operator, and also a\n * delay-like operator since output emissions do not necessarily occur at the\n * same time as they did on the source Observable.\n *\n * @example <caption>Emit the most recent click after a burst of clicks</caption>\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var result = clicks.debounce(() => Rx.Observable.interval(1000));\n * result.subscribe(x => console.log(x));\n *\n * @see {@link audit}\n * @see {@link debounceTime}\n * @see {@link delayWhen}\n * @see {@link throttle}\n *\n * @param {function(value: T): SubscribableOrPromise} durationSelector A function\n * that receives a value from the source Observable, for computing the timeout\n * duration for each source value, returned as an Observable or a Promise.\n * @return {Observable} An Observable that delays the emissions of the source\n * Observable by the specified duration Observable returned by\n * `durationSelector`, and may drop some values if they occur too frequently.\n * @method debounce\n * @owner Observable\n */\nexport function debounce<T>(durationSelector: (value: T) => SubscribableOrPromise<number>): MonoTypeOperatorFunction<T> {\n return (source: Observable<T>) => source.lift(new DebounceOperator(durationSelector));\n}\n\nclass DebounceOperator<T> implements Operator<T, T> {\n constructor(private durationSelector: (value: T) => SubscribableOrPromise<number>) {\n }\n\n call(subscriber: Subscriber<T>, source: any): TeardownLogic {\n return source.subscribe(new DebounceSubscriber(subscriber, this.durationSelector));\n }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass DebounceSubscriber<T, R> extends OuterSubscriber<T, R> {\n private value: T;\n private hasValue: boolean = false;\n private durationSubscription: Subscription = null;\n\n constructor(destination: Subscriber<R>,\n private durationSelector: (value: T) => SubscribableOrPromise<number>) {\n super(destination);\n }\n\n protected _next(value: T): void {\n try {\n const result = this.durationSelector.call(this, value);\n\n if (result) {\n this._tryNext(value, result);\n }\n } catch (err) {\n this.destination.error(err);\n }\n }\n\n protected _complete(): void {\n this.emitValue();\n this.destination.complete();\n }\n\n private _tryNext(value: T, duration: SubscribableOrPromise<number>): void {\n let subscription = this.durationSubscription;\n this.value = value;\n this.hasValue = true;\n if (subscription) {\n subscription.unsubscribe();\n this.remove(subscription);\n }\n\n subscription = subscribeToResult(this, duration);\n if (!subscription.closed) {\n this.add(this.durationSubscription = subscription);\n }\n }\n\n notifyNext(outerValue: T, innerValue: R,\n outerIndex: number, innerIndex: number,\n innerSub: InnerSubscriber<T, R>): void {\n this.emitValue();\n }\n\n notifyComplete(): void {\n this.emitValue();\n }\n\n emitValue(): void {\n if (this.hasValue) {\n const value = this.value;\n const subscription = this.durationSubscription;\n if (subscription) {\n this.durationSubscription = null;\n subscription.unsubscribe();\n this.remove(subscription);\n }\n this.value = null;\n this.hasValue = false;\n super._next(value);\n }\n }\n}\n"]} |