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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
ChangeDetectionStrategy,
Component,
type EffectCleanupRegisterFn,
ElementRef,
afterRenderEffect,
inject,
viewChild,
} from '@angular/core';
import { ContextPagelayoutComponent } from './context-pagelayout.component';
@Component({
selector: 'gc-form-pagelayout',
templateUrl: './form-pagelayout.component.html',
styleUrls: ['./form-pagelayout.component.css'],
changeDetection: ChangeDetectionStrategy.Default,
standalone: false,
})
export class FormPagelayoutComponent {
protected readonly $breadcrumbContainer = viewChild<ElementRef<HTMLElement>>(
'breadcrumbContainer',
);
constructor() {
const contextPage = inject(ContextPagelayoutComponent, { optional: true });
if (contextPage) {
afterRenderEffect({
read: onCleanup => this.observeBreadcrumbPosition(onCleanup),
});
}
}
private observeBreadcrumbPosition(onCleanup: EffectCleanupRegisterFn) {
const viewChild = this.$breadcrumbContainer();
if (viewChild) {
const element = viewChild.nativeElement;
const intersectionObserver = new IntersectionObserver(
([e]) => {
element.classList.toggle('surface-contrast', e.intersectionRatio < 1);
element.classList.toggle('surface-view', e.intersectionRatio >= 1);
},
{
threshold: 1,
rootMargin: '0px',
},
);
intersectionObserver.observe(element);
onCleanup(() => {
intersectionObserver.disconnect();
});
}
}
}
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