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ContentChild,
ContentChildren,
Directive,
ElementRef,
HostBinding,
HostListener,
Input,
NgZone,
OnDestroy,
QueryList,
} from '@angular/core';
import {
IndexedItem,
handleActive,
observeSize,
} from '../utils/internal-utils';
import { Callback, Key } from '../utils/util.types';
import { BadgeComponent } from '../badge/badge.component';
import { VirtualListboxService } from './virtual-listbox.service';
/**
* Aria Support for ListBox using a virtual focus with aria-activedescendant
*/
@Directive({
selector: '[data-gc-virtual-listbox-item]',
standalone: false,
})
export class VirtualListBoxItemDirective implements OnDestroy {
@ContentChildren('gcBadgeRendered')
public renderedBadges!: QueryList<BadgeComponent>;
@Input('data-gc-virtual-listbox-item')
public item!: IndexedItem<unknown>;
@Input('ignoreSelection')
public ignoreSelection = false;
@HostBinding('attr.role')
public readonly role = 'option';
@HostBinding('attr.aria-posinset')
public ariaPosInSet = 1;
@HostBinding('attr.aria-setsize')
public ariaSetSize = 1;
@HostBinding('class.gc-list-item-focused')
public _focused = false;
@HostBinding('class.gc-list-item-active')
public _active = false;
@HostBinding('class.gc-selected')
get classSelected(): boolean {
return this.selected;
}
@HostBinding('class.surface-contrast')
get classSurfaceSelected(): boolean {
return this.selected;
}
@HostBinding('attr.aria-selected')
get ariaSelected(): boolean {
return this.selected;
}
@ContentChild('gcBadge', { read: ElementRef })
public set badge(badge: ElementRef<HTMLElement> | undefined) {
this._badge = badge;
this.handleBadgeUpdate();
}
public get badge() {
return this._badge;
}
@ContentChild('gcIcon')
public set icon(icon: ElementRef<HTMLElement> | undefined) {
this._icon = icon;
}
public get icon(): ElementRef<HTMLElement> | undefined {
return this._icon;
}
get key(): Key {
return this.item.key;
}
get selected(): boolean {
return this.key == this.vls.value && !this.ignoreSelection;
}
get index(): number {
return this.item.index;
}
set focused(value: boolean) {
this._focused = value;
if (value) {
this.scrollIntoView();
}
}
get focused() {
return this._focused;
}
private readonly _activeSubscription: Callback;
private _sizeSubscription?: Callback;
private _badge?: ElementRef<HTMLElement>;
private _icon?: ElementRef<HTMLElement>;
constructor(
private readonly el: ElementRef<HTMLElement>,
private readonly zone: NgZone,
private readonly vls: VirtualListboxService,
) {
this._activeSubscription = handleActive(
el.nativeElement,
() => {
this._active = true;
},
() => {
this._active = false;
},
);
}
@HostListener('click')
public _handleClick() {
if (!this.ignoreSelection) {
this.vls.selectItem(this.item.item, false);
}
this.vls.updateFocusedIndex(this.item.index);
}
@HostListener('dblclick')
public _handleDoubleClick() {
if (!this.ignoreSelection) {
this.vls.selectItem(this.item.item, true);
}
}
@HostListener('mousedown')
public _handleMouseDown() {
this.vls.updateFocusedIndex(this.item.index);
}
/** @ignore */
ngOnDestroy(): void {
this._activeSubscription();
if (this._sizeSubscription) {
this._sizeSubscription();
}
}
updateItem(index: number, size: number): void {
this.ariaPosInSet = this.index + 1;
this.ariaSetSize = size;
}
scrollIntoView() {
this.el.nativeElement.scrollIntoView({
block: 'nearest',
inline: 'nearest',
});
}
private handleBadgeUpdate() {
if (this._sizeSubscription) {
this._sizeSubscription();
this._sizeSubscription = undefined;
}
if (this.badge) {
const listResize = observeSize(
this.el,
this.zone,
this.handleResize.bind(this),
);
const badgeResize = observeSize(
this.el,
this.zone,
this.handleResize.bind(this),
);
this._sizeSubscription = () => {
listResize();
badgeResize();
};
}
}
private handleResize() {
if (this.badge) {
const badgeWidth = this.badge.nativeElement.clientWidth;
const itemWidth = this.el.nativeElement.clientWidth;
let availableWidth = itemWidth - 16 * 2; // remove the padding
if (this._icon) {
availableWidth -= 40; // Bounding Box for Icons
availableWidth -= 12; // Space between icon and text
}
availableWidth -= badgeWidth;
availableWidth -= 20; // Margin of the badge
if (availableWidth < 160) {
this.renderedBadges.forEach(e => (e.allowTextWrap = true));
} else {
this.renderedBadges.forEach(e => (e.allowTextWrap = false));
}
}
}
}
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