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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
ChangeDetectionStrategy,
Component,
ElementRef,
NgZone,
OnDestroy,
computed,
effect,
input,
signal,
untracked,
viewChild,
viewChildren,
} from '@angular/core';
import { LinkEvent } from '../utils/event.types';
import { observeElementSize } from '../utils/internal-utils';
import { Callback, Consumer, LinkItem } from '../utils/util.types';
import { itemTrack } from '../utils/utilities';
/**
* Breadcrumbs component is a graphical control element used as a navigational aid on a web page.
*/
@Component({
selector: 'gc-breadcrumbs',
templateUrl: './breadcrumbs.component.html',
styleUrls: ['./breadcrumbs.component.css'],
changeDetection: ChangeDetectionStrategy.Default,
standalone: false,
})
export class BreadcrumbsComponent implements OnDestroy {
/**
* Indicates that breadcrumbs is in loading state.
*/
public isLoading = input(false);
/**
* Optional handler to customize handling of navigation requests
*/
public linkHandler = input<Consumer<LinkEvent<LinkItem>>>();
/**
* Items that will be rendered as breadcrumbs.
*/
public items = input.required<readonly LinkItem[]>();
/**
* @ignore
*/
protected _visibleItems = signal<ReadonlySet<string>>(new Set());
/**
* @ignore
*/
protected _computeLastItemText = computed<string>(() => {
return this.items().at(-1)?.label ?? '';
});
protected _getPoppedItems = computed<LinkItem[]>(() => {
return this.items().filter(i => !this._isItemVisible(i));
});
/** @ignore */
private menuItem = viewChild<ElementRef<HTMLElement>>('collapsedMenuItem');
/**
* @ignore
*/
private renderedItems =
viewChildren<ElementRef<HTMLElement>>('breadcrumbItem');
/**
* @ignore
*/
private resizeObserver: Callback;
/** @ignore */
private _items: readonly LinkItem[] = [];
constructor(
private el: ElementRef<HTMLElement>,
zone: NgZone,
) {
this.resizeObserver = observeElementSize(
el.nativeElement,
zone,
this.computeVisibleItems.bind(this),
);
effect(() => {
// recomputation required when menuItem is added/removed because of change to isLoading
this.menuItem();
const items = this.items();
untracked(() => {
if (this._items.length === this._visibleItems().size) {
// avoid immediate change of the visibility of the 'collapsedMenuItem' to avoid visible layout jumps
// in case the following full recalculation determines no change is needed
this._visibleItems.set(new Set(items.map(i => i.key)));
}
});
this._items = items;
untracked(() => {
this.computeVisibleItems();
});
});
}
/**
* @ignore
*/
ngOnDestroy(): void {
this.resizeObserver();
}
/** @ignore */
public _isFirstItem(item: LinkItem): boolean {
return this.items().at(0)?.key === item.key;
}
/** @ignore */
public _isLastItem(item: LinkItem): boolean {
return this.items().at(-1)?.key === item.key;
}
/** @ignore */
public _onMenuAction(item: LinkItem): void {
const linkHandler = this.linkHandler();
if (linkHandler) {
linkHandler({ linkInfo: item, replace: true });
} else {
window.open(item.link, '_self');
}
}
/** @ignore */
public _isItemVisible(item: LinkItem): boolean {
return this._visibleItems().has(item.key);
}
/** @ignore */
protected _createLinkHandler(item: LinkItem): Consumer<LinkEvent> {
return evt => {
const linkHandler = this.linkHandler();
if (linkHandler) {
linkHandler({ linkInfo: item, replace: evt.replace });
}
};
}
/** @ignore */
protected _itemTrackBy(item: LinkItem): string {
return itemTrack(item);
}
/**
* @ignore
*/
private computeVisibleItems(): void {
const items = this.items();
const renderedItems = this.renderedItems();
const menuItem = this.menuItem();
if (
menuItem === undefined ||
items.length === 0 ||
renderedItems.length === 0
) {
this._visibleItems.set(new Set());
return;
}
const hostBounds = this.el.nativeElement.getBoundingClientRect();
const collapsedMenuItemWidth =
menuItem.nativeElement.getBoundingClientRect().width;
let availableWidth = hostBounds.width;
// last item is always visible
const visibleItems = new Set([items[items.length - 1].key]);
availableWidth -=
renderedItems[
renderedItems.length - 1
].nativeElement.getBoundingClientRect().width;
// add remaining items until no space is left
for (let i = items.length - 2; i >= 0 && availableWidth > 0; i--) {
const itemWidth = renderedItems
.at(i)
?.nativeElement.getBoundingClientRect().width;
if (itemWidth === undefined) {
console.warn('failed to find rendered item for item index', i);
break;
}
// include the width of the collapsed menu item in the calculation, as it needs to also fit
// in front of the current item when it'd be the last one to show
const requiredWidth = itemWidth + (i > 0 ? collapsedMenuItemWidth : 0);
if (availableWidth >= requiredWidth) {
visibleItems.add(items[i].key);
availableWidth -= itemWidth;
} else {
availableWidth = 0;
}
}
this._visibleItems.set(visibleItems);
}
}
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