work.suroh.tk/node_modules/rxjs/operators/window.js

112 lines
4.2 KiB
JavaScript

"use strict";
var __extends = (this && this.__extends) || function (d, b) {
for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var Subject_1 = require('../Subject');
var OuterSubscriber_1 = require('../OuterSubscriber');
var subscribeToResult_1 = require('../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
*/
function window(windowBoundaries) {
return function windowOperatorFunction(source) {
return source.lift(new WindowOperator(windowBoundaries));
};
}
exports.window = window;
var WindowOperator = (function () {
function WindowOperator(windowBoundaries) {
this.windowBoundaries = windowBoundaries;
}
WindowOperator.prototype.call = function (subscriber, source) {
var windowSubscriber = new WindowSubscriber(subscriber);
var sourceSubscription = source.subscribe(windowSubscriber);
if (!sourceSubscription.closed) {
windowSubscriber.add(subscribeToResult_1.subscribeToResult(windowSubscriber, this.windowBoundaries));
}
return sourceSubscription;
};
return WindowOperator;
}());
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var WindowSubscriber = (function (_super) {
__extends(WindowSubscriber, _super);
function WindowSubscriber(destination) {
_super.call(this, destination);
this.window = new Subject_1.Subject();
destination.next(this.window);
}
WindowSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
this.openWindow();
};
WindowSubscriber.prototype.notifyError = function (error, innerSub) {
this._error(error);
};
WindowSubscriber.prototype.notifyComplete = function (innerSub) {
this._complete();
};
WindowSubscriber.prototype._next = function (value) {
this.window.next(value);
};
WindowSubscriber.prototype._error = function (err) {
this.window.error(err);
this.destination.error(err);
};
WindowSubscriber.prototype._complete = function () {
this.window.complete();
this.destination.complete();
};
/** @deprecated internal use only */ WindowSubscriber.prototype._unsubscribe = function () {
this.window = null;
};
WindowSubscriber.prototype.openWindow = function () {
var prevWindow = this.window;
if (prevWindow) {
prevWindow.complete();
}
var destination = this.destination;
var newWindow = this.window = new Subject_1.Subject();
destination.next(newWindow);
};
return WindowSubscriber;
}(OuterSubscriber_1.OuterSubscriber));
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