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node_modules/rxjs/_esm2015/operators/window.js

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+import { Subject } from '../Subject';
+import { OuterSubscriber } from '../OuterSubscriber';
+import { subscribeToResult } from '../util/subscribeToResult';
+/**
+ * Branch out the source Observable values as a nested Observable whenever
+ * `windowBoundaries` emits.
+ *
+ * <span class="informal">It's like {@link buffer}, but emits a nested Observable
+ * instead of an array.</span>
+ *
+ * <img src="./img/window.png" width="100%">
+ *
+ * Returns an Observable that emits windows of items it collects from the source
+ * Observable. The output Observable emits connected, non-overlapping
+ * windows. It emits the current window and opens a new one whenever the
+ * Observable `windowBoundaries` emits an item. Because each window is an
+ * Observable, the output is a higher-order Observable.
+ *
+ * @example <caption>In every window of 1 second each, emit at most 2 click events</caption>
+ * var clicks = Rx.Observable.fromEvent(document, 'click');
+ * var interval = Rx.Observable.interval(1000);
+ * var result = clicks.window(interval)
+ *   .map(win => win.take(2)) // each window has at most 2 emissions
+ *   .mergeAll(); // flatten the Observable-of-Observables
+ * result.subscribe(x => console.log(x));
+ *
+ * @see {@link windowCount}
+ * @see {@link windowTime}
+ * @see {@link windowToggle}
+ * @see {@link windowWhen}
+ * @see {@link buffer}
+ *
+ * @param {Observable<any>} windowBoundaries An Observable that completes the
+ * previous window and starts a new window.
+ * @return {Observable<Observable<T>>} An Observable of windows, which are
+ * Observables emitting values of the source Observable.
+ * @method window
+ * @owner Observable
+ */
+export function window(windowBoundaries) {
+    return function windowOperatorFunction(source) {
+        return source.lift(new WindowOperator(windowBoundaries));
+    };
+}
+class WindowOperator {
+    constructor(windowBoundaries) {
+        this.windowBoundaries = windowBoundaries;
+    }
+    call(subscriber, source) {
+        const windowSubscriber = new WindowSubscriber(subscriber);
+        const sourceSubscription = source.subscribe(windowSubscriber);
+        if (!sourceSubscription.closed) {
+            windowSubscriber.add(subscribeToResult(windowSubscriber, this.windowBoundaries));
+        }
+        return sourceSubscription;
+    }
+}
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class WindowSubscriber extends OuterSubscriber {
+    constructor(destination) {
+        super(destination);
+        this.window = new Subject();
+        destination.next(this.window);
+    }
+    notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
+        this.openWindow();
+    }
+    notifyError(error, innerSub) {
+        this._error(error);
+    }
+    notifyComplete(innerSub) {
+        this._complete();
+    }
+    _next(value) {
+        this.window.next(value);
+    }
+    _error(err) {
+        this.window.error(err);
+        this.destination.error(err);
+    }
+    _complete() {
+        this.window.complete();
+        this.destination.complete();
+    }
+    /** @deprecated internal use only */ _unsubscribe() {
+        this.window = null;
+    }
+    openWindow() {
+        const prevWindow = this.window;
+        if (prevWindow) {
+            prevWindow.complete();
+        }
+        const destination = this.destination;
+        const newWindow = this.window = new Subject();
+        destination.next(newWindow);
+    }
+}
+//# sourceMappingURL=window.js.map