windowToggle.js
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import { Subject } from '../Subject';
import { Subscription } from '../Subscription';
import { operate } from '../util/lift';
import { innerFrom } from '../observable/innerFrom';
import { createOperatorSubscriber } from './OperatorSubscriber';
import { noop } from '../util/noop';
import { arrRemove } from '../util/arrRemove';
export function windowToggle(openings, closingSelector) {
return operate((source, subscriber) => {
const windows = [];
const handleError = (err) => {
while (0 < windows.length) {
windows.shift().error(err);
}
subscriber.error(err);
};
innerFrom(openings).subscribe(createOperatorSubscriber(subscriber, (openValue) => {
const window = new Subject();
windows.push(window);
const closingSubscription = new Subscription();
const closeWindow = () => {
arrRemove(windows, window);
window.complete();
closingSubscription.unsubscribe();
};
let closingNotifier;
try {
closingNotifier = innerFrom(closingSelector(openValue));
}
catch (err) {
handleError(err);
return;
}
subscriber.next(window.asObservable());
closingSubscription.add(closingNotifier.subscribe(createOperatorSubscriber(subscriber, closeWindow, noop, handleError)));
}, noop));
source.subscribe(createOperatorSubscriber(subscriber, (value) => {
const windowsCopy = windows.slice();
for (const window of windowsCopy) {
window.next(value);
}
}, () => {
while (0 < windows.length) {
windows.shift().complete();
}
subscriber.complete();
}, handleError, () => {
while (0 < windows.length) {
windows.shift().unsubscribe();
}
}));
});
}
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