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AfterContentInit,
Component,
ContentChildren,
ElementRef,
NgZone,
OnDestroy,
QueryList,
forwardRef,
} from '@angular/core';
import { Subscription } from 'rxjs';
import { FocusableElementOwner } from '../utils/util.types';
import { CardComponent } from './card.component';
/**
* `gc-card-layout` is used to group `gc-card` components
*/
@Component({
selector: 'gc-card-layout',
templateUrl: './card-layout.component.html',
styleUrls: ['./card-layout.component.css'],
})
export class CardLayoutComponent
implements AfterContentInit, OnDestroy, FocusableElementOwner
{
/** @ignore */
@ContentChildren(forwardRef(() => CardComponent))
private cards?: QueryList<CardComponent>;
/** @ignore */
private cardSubscription?: Subscription;
/** @ignore */
private resizeObserver?: ResizeObserver;
constructor(
private readonly elementRef: ElementRef<HTMLElement>,
private readonly zone: NgZone,
) {
zone.runOutsideAngular(() => {
this.resizeObserver = new ResizeObserver(() => this.handleResize());
this.resizeObserver.observe(elementRef.nativeElement);
});
}
/** @ignore */
public ngOnDestroy(): void {
if (this.cardSubscription) {
this.cardSubscription.unsubscribe();
}
this.resizeObserver?.disconnect();
}
/** @ignore */
public ngAfterContentInit(): void {
this.cardSubscription = this.cards?.changes.subscribe(() => {
this.zone.runOutsideAngular(() => this.handleResize());
});
}
public focusChild(): boolean {
if (this.cards?.first) {
return this.cards.first.focusChild();
}
return false;
}
/** @ignore */
public _recomputeHeaders(): void {
NgZone.assertNotInAngularZone();
if (this.cards) {
const cards = this.cards.toArray();
const itemsPerRow = this.computeRowItems();
for (let i = 0; i < cards.length; i += itemsPerRow) {
const row = cards.slice(i, Math.min(i + itemsPerRow, cards.length));
const maxHeight = Math.max(...row.map(c => c._headerTitleHeight()));
row.forEach(c => c._updateMinTitleHeight(maxHeight));
}
}
}
/** @ignore */
private computeRowItems() {
const rect = this.elementRef.nativeElement.getBoundingClientRect();
if (rect.width >= 1400) {
return 3;
} else if (rect.width >= 1025) {
return 2;
}
return 1;
}
/** @ignore */
private handleResize(): void {
if (!this.cards) {
return;
}
NgZone.assertNotInAngularZone();
const itemsPerRow = this.computeRowItems();
const columnSpan = 12 / itemsPerRow;
const cards = this.cards.toArray();
let columnIndex = 1;
for (let i = 0; i < cards.length; i++) {
if (i % itemsPerRow === 0) {
columnIndex = 1;
}
cards[i]._updateColumnConfig(columnIndex, columnIndex + columnSpan);
columnIndex += columnSpan;
}
this._recomputeHeaders();
}
}
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