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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | import {
ChangeDetectionStrategy,
Component,
ElementRef,
Optional,
effect,
viewChild,
} from '@angular/core';
import { ContextPagelayoutComponent } from './context-pagelayout.component';
@Component({
selector: 'gc-taboverview-pagelayout',
templateUrl: './taboverview-pagelayout.component.html',
styleUrls: ['./taboverview-pagelayout.component.css'],
changeDetection: ChangeDetectionStrategy.Eager,
standalone: false,
})
export class TabOverviewPagelayoutComponent {
protected readonly $breadcrumbContainer = viewChild<ElementRef<HTMLElement>>(
'breadcrumbContainer',
);
private intersectionObserver?: IntersectionObserver;
constructor(@Optional() contextPage: ContextPagelayoutComponent | null) {
if (contextPage) {
effect(() => {
const el = this.$breadcrumbContainer();
this.observeBreadcrumbPosition(el?.nativeElement);
});
}
}
private observeBreadcrumbPosition(element: HTMLElement | undefined) {
this.intersectionObserver?.disconnect();
this.intersectionObserver = undefined;
if (element) {
this.intersectionObserver = new IntersectionObserver(
([e]) => {
element.classList.toggle('surface-contrast', e.intersectionRatio < 1);
element.classList.toggle('surface-view', e.intersectionRatio >= 1);
},
{
threshold: 1,
rootMargin: '0px',
},
);
this.intersectionObserver.observe(element);
}
}
}
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