Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { Callback, Key } from '../utils/util.types'; import { IndexedItem, handleActive, observeSize } from '../utils/internal-utils'; import { BadgeComponent } from '../badge/badge.component'; import { VirtualListBoxDirective } from './virtual-listbox.directive'; /** * Aria Support for ListBox using a virtual focus with aria-activedescendant */ @Directive({ selector: '[virtual-listbox-item]' }) export class VirtualListBoxItemDirective implements OnDestroy { @ContentChildren('gcBadgeRendered') public renderedBadges!: QueryList<BadgeComponent>; @Input('virtual-listbox-item') public item!: IndexedItem<unknown>; @HostBinding('attr.role') public readonly role = 'option'; @HostBinding('attr.area-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._listbox?.value; } get index(): number { return this.item.index; } set focused(value: boolean) { this._focused = value; if( value ) { this.scrollIntoView(); } } get focused() { return this._focused; } private _listbox!: VirtualListBoxDirective; private _activeSubscription: Callback; private _sizeSubscription?: Callback; private _badge?: ElementRef<HTMLElement>; private _icon?: ElementRef<HTMLElement>; constructor(private el: ElementRef<HTMLElement>, private zone: NgZone) { this._activeSubscription = handleActive(el.nativeElement, () => { this._active = true; }, () => { this._active = false; }); } @HostListener('click') public _handleClick() { this._listbox.selectItem(this.item.item, false); this._listbox.updateFocusedIndex(this.item.index); } @HostListener('dblclick') public _handleDoubleClick() { this._listbox.selectItem(this.item.item, true); } @HostListener('mousedown') public _handleMouseDown() { this._listbox.updateFocusedIndex(this.item.index); } /** @ignore */ ngOnDestroy(): void { this._activeSubscription(); if( this._sizeSubscription ) { this._sizeSubscription(); } } updateItem(listbox: VirtualListBoxDirective, index: number, size: number): void { this._listbox = listbox; 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 ); } } } } |