All files / lib/page-layout split-pagelayout.component.ts

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import {
  ChangeDetectionStrategy,
  Component,
  ElementRef,
  HostBinding,
  OnDestroy,
  Optional,
  effect,
  viewChild,
} from '@angular/core';
 
import { ContextPagelayoutComponent } from './context-pagelayout.component';
 
@Component({
  selector: 'gc-split-pagelayout',
  templateUrl: './split-pagelayout.component.html',
  styleUrls: ['./split-pagelayout.component.css'],
  changeDetection: ChangeDetectionStrategy.Default,
  standalone: false,
})
export class SplitPagelayoutComponent implements OnDestroy {
  @HostBinding('class.gc-split-pagelayout')
  protected csshelper = true;
 
  protected $breadcrumbContainer = viewChild<ElementRef<HTMLElement>>(
    'breadcrumbContainer',
  );
 
  private intersectionObserver?: IntersectionObserver;
 
  constructor(@Optional() contextPage: ContextPagelayoutComponent | null) {
    if (contextPage) {
      effect(() => {
        const el = this.$breadcrumbContainer();
        this.observeBreadcrumbPosition(el?.nativeElement);
      });
    }
  }
 
  ngOnDestroy(): void {
    this.intersectionObserver?.disconnect();
  }
 
  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);
    }
  }
}