@catull/igniteui-angular/esm2015/lib/services/overlay/scroll/absolute-scroll-strategy.js

Ignite UI for Angular is a dependency-free Angular toolkit for building modern web apps

import { ScrollStrategy } from './scroll-strategy';
/**
 * On scroll reposition the overlay content.
 */
export class AbsoluteScrollStrategy extends ScrollStrategy {
    constructor(scrollContainer) {
        super(scrollContainer);
        this._initialized = false;
        this.onScroll = (e) => {
            const overlayInfo = this._overlayService.getOverlayById(this._id);
            if (!overlayInfo) {
                return;
            }
            if (!overlayInfo.elementRef.nativeElement.contains(e.target)) {
                this._overlayService.reposition(this._id);
            }
        };
        this._scrollContainer = scrollContainer;
    }
    /** @inheritdoc */
    initialize(document, overlayService, id) {
        if (this._initialized) {
            return;
        }
        this._overlayService = overlayService;
        this._id = id;
        this._document = document;
        this._zone = overlayService.getOverlayById(id).ngZone;
        this._initialized = true;
    }
    /** @inheritdoc */
    attach() {
        if (this._zone) {
            this._zone.runOutsideAngular(() => {
                this.addScrollEventListener();
            });
        }
        else {
            this.addScrollEventListener();
        }
    }
    /** @inheritdoc */
    detach() {
        if (this._scrollContainer) {
            this._scrollContainer.removeEventListener('scroll', this.onScroll, true);
        }
        else {
            this._document.removeEventListener('scroll', this.onScroll, true);
        }
        this._initialized = false;
    }
    addScrollEventListener() {
        if (this._scrollContainer) {
            this._scrollContainer.addEventListener('scroll', this.onScroll, true);
        }
        else {
            this._document.addEventListener('scroll', this.onScroll, true);
        }
    }
}
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