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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
ChangeDetectionStrategy,
Component,
ElementRef,
NgZone,
OnDestroy,
TemplateRef,
Type,
computed,
input,
output,
viewChild,
viewChildren,
} from '@angular/core';
import { observeElementSize, subscribeWindow } from '../utils/internal-utils';
import {
BadgeItem,
Callback,
FocusableElementOwner,
Item,
Key,
} from '../utils/util.types';
import { itemTrack } from '../utils/utilities';
import { ComponentMapperDirective } from '../internal/component-mapper.directive';
import { BadgeItemTemplateContext } from '../badge-list/badge-list.component';
import { ButtonComponent } from '../button/button.component';
/**
* Context Header is a responsive, context-specific, horizontal user interface element that contains badges and links that lead to other websites or parts of the page.
*/
@Component({
selector: 'gc-context-header',
templateUrl: './context-header.component.html',
styleUrls: ['./context-header.component.css'],
changeDetection: ChangeDetectionStrategy.Eager,
standalone: false,
})
export class ContextHeaderComponent
implements OnDestroy, FocusableElementOwner
{
/**
* Label to show in the header.
*/
public readonly label = input.required<string>();
/**
* Items that will be rendered as badges in the header.
*/
public readonly badges = input<readonly BadgeItem[]>([]);
/**
* Icon template that will be used for the badges.
*/
public readonly iconProvider = input<TemplateRef<BadgeItemTemplateContext>>();
/** Emitted when an action item is pressed. */
public readonly onAction = output<Item>();
/**
* Items that will be rendered as buttons in the header.
*/
public readonly actions = input<Item[]>([]);
/**
* @ignore
*/
public _mode: 'small' | 'medium' | 'default' = 'default';
/** @ignore */
protected readonly _popItems = computed<readonly Item[]>(() => {
return this.actions().map(a => ({
key: a.key,
label: `${a.label} öffnen`,
}));
});
/** @ignore */
protected inSmallText = false;
/**
* @ignore
*/
private readonly actionsContainerElement =
viewChild.required<ElementRef<HTMLDivElement>>('actionsContainer');
/** @ignore */
private readonly menuButton = viewChild('menuButton', {
read: ButtonComponent,
});
/** @ignore */
private readonly actionButtons = viewChildren('actionButton', {
// eslint-disable-next-line @typescript-eslint/no-unnecessary-type-assertion -- required otherwise we get an error at the callsite
read: ComponentMapperDirective as Type<
ComponentMapperDirective<ButtonComponent>
>,
});
/**
* @ignore
*/
private observerCallbacks: Callback[] = [];
constructor(zone: NgZone, el: ElementRef<HTMLElement>) {
this.observerCallbacks.push(
observeElementSize(el.nativeElement, zone, this.handleResize.bind(this)),
);
this.observerCallbacks.push(
subscribeWindow('resize', this.computeWindowRelatedProps.bind(this)),
);
this.computeWindowRelatedProps();
}
/**
* @ignore
*/
ngOnDestroy(): void {
this.observerCallbacks.forEach(cb => cb());
}
/**
* Focus action in the header with the given key.
* @param key the key of the `action` to focus
* @returns `true` if focus has been transferred
*/
public focusAction(key: Key): boolean {
if (this._mode === 'default') {
const button = this.actionButtons().find(i => i.key === key)?.component;
if (button) {
return button.focusChild();
}
} else {
const menuButton = this.menuButton();
return menuButton ? menuButton.focusChild() : false;
}
return false;
}
public focusChild(): boolean {
if (this._mode !== 'default') {
const menuButton = this.menuButton();
return menuButton ? menuButton.focusChild() : false;
} else {
for (const action of this.actions()) {
if (this.focusAction(action.key)) {
return true;
}
}
}
return false;
}
/** @ignore */
protected handleMenuAction(item: Item) {
const action = this.actions().find(a => a.key === item.key);
if (action) {
this.onAction.emit(action);
} else {
console.error(`Unable to find action ${item.key}`);
}
}
/**
* @ignore
*/
protected _itemTrackBy(item: Item): string {
return itemTrack(item);
}
/** @ignore */
private computeWindowRelatedProps() {
this.inSmallText = window.innerWidth <= 480 || window.innerHeight <= 1024;
}
/** @ignore */
private handleResize(entry: ResizeObserverEntry): void {
// padding 64px
// gap = 24px
const elementWidth = entry.contentRect.width - 64 - 24;
const mediumButtonExists = this.actions().length > 0;
// medium button is 148px
if (elementWidth - (mediumButtonExists ? 148 : 0) < 400) {
this._mode = 'small';
return;
}
const actionsContainerWidth =
this.actionsContainerElement().nativeElement.getBoundingClientRect()
.width;
const spaceInHeader = elementWidth - actionsContainerWidth;
if (spaceInHeader < 720) {
this._mode = 'medium';
} else {
this._mode = 'default';
}
}
}
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