return this._platform.isBrowser ? Observable.create(function (observer) {
if (!_this._globalSubscription) {
_this._addGlobalListener();
}
// In the case of a 0ms delay, use an observable without auditTime
// since it does add a perceptible delay in processing overhead.
var /** @type {?} */ subscription = auditTimeInMs > 0 ?
_this._scrolled.pipe(auditTime(auditTimeInMs)).subscribe(observer) :
_this._scrolled.subscribe(observer);
_this._scrolledCount++;
return function () {
subscription.unsubscribe();
_this._scrolledCount--;
if (!_this._scrolledCount) {
_this._removeGlobalListener();
}
};
}) : of();
return this._platform.isBrowser ? Observable.create(observer => {
if (!this._globalSubscription) {
this._addGlobalListener();
}
// In the case of a 0ms delay, use an observable without auditTime
// since it does add a perceptible delay in processing overhead.
const /** @type {?} */ subscription = auditTimeInMs > 0 ?
this._scrolled.pipe(auditTime(auditTimeInMs)).subscribe(observer) :
this._scrolled.subscribe(observer);
this._scrolledCount++;
return () => {
subscription.unsubscribe();
this._scrolledCount--;
if (this._globalSubscription && !this._scrolledCount) {
this._globalSubscription.unsubscribe();
this._globalSubscription = null;
}
};
}) : of();
/**
* Returns a stream that emits whenever the size of the viewport changes.
* @param {?=} throttleTime
* @return {?}
*/
change(throttleTime = DEFAULT_RESIZE_TIME) {
return throttleTime > 0 ? this._change.pipe(auditTime(throttleTime)) : this._change;
}
ViewportRuler.prototype.change = /**
* Returns a stream that emits whenever the size of the viewport changes.
* @param {?=} throttleTime
* @return {?}
*/
function (throttleTime) {
if (throttleTime === void 0) { throttleTime = DEFAULT_RESIZE_TIME; }
return throttleTime > 0 ? this._change.pipe(auditTime(throttleTime)) : this._change;
};
this._ngZone.runOutsideAngular(() => {
fromEvent(window, 'resize')
.pipe(auditTime(16), takeUntil(this._destroyed))
.subscribe(() => this.resizeToFitContent(true));
});