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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/* tslint:disable:array-type member-access variable-name typedef
only-arrow-functions directive-class-suffix component-class-suffix
component-selector*/
import {Directive, ElementRef, NgZone, OnDestroy, OnInit, Renderer2} from '@angular/core';
import {Observable} from 'rxjs/Observable';
import {Subject} from 'rxjs/Subject';
import {ScrollDispatcher} from './scroll-dispatcher';
/**
* Sends an event when the directive's element is scrolled. Registers itself
* with the ScrollDispatcher service to include itself as part of its collection
* of scrolling events that it can be listened to through the service.
*/
@Directive({selector: '[cdk-scrollable], [cdkScrollable]'})
export class Scrollable implements OnInit, OnDestroy {
private _elementScrolled: Subject<Event> = new Subject();
private _scrollListener: Function|null;
constructor(
private _elementRef: ElementRef, private _scroll: ScrollDispatcher,
private _ngZone: NgZone, private _renderer: Renderer2) {}
ngOnInit() {
this._scrollListener = this._ngZone.runOutsideAngular(() => {
return this._renderer.listen(
this.getElementRef().nativeElement, 'scroll', (event: Event) => {
this._elementScrolled.next(event);
});
});
this._scroll.register(this);
}
ngOnDestroy() {
this._scroll.deregister(this);
if (this._scrollListener) {
this._scrollListener();
this._scrollListener = null;
}
}
/**
* Returns observable that emits when a scroll event is fired on the host
* element.
*/
elementScrolled(): Observable<any> {
return this._elementScrolled.asObservable();
}
getElementRef(): ElementRef {
return this._elementRef;
}
}
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