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AfterContentInit,
ChangeDetectorRef,
ContentChildren,
Directive,
EventEmitter,
HostBinding,
HostListener,
Input,
OnDestroy,
Output,
QueryList,
} from '@angular/core';
import { Subscription } from 'rxjs';
import { isPrintableCharacter } from '../utils/internal-utils';
import { Converter, Item, Key } from '../utils/util.types';
import { VirtualListBoxItemDirective } from './virtual-listbox-item.directive';
export interface ListboxSelectEvent {
key: Key;
open: boolean;
}
/**
* Aria Support for ListBox using a virtual focus with aria-activedescendant
*/
@Directive({
selector: '[data-gc-virtual-listbox]',
})
export class VirtualListBoxDirective implements AfterContentInit, OnDestroy {
@Output()
public readonly onSelect: EventEmitter<ListboxSelectEvent> =
new EventEmitter<ListboxSelectEvent>();
@HostBinding('attr.role')
readonly role = 'listbox';
@HostBinding('tabindex')
readonly tabindex = 0;
@ContentChildren(VirtualListBoxItemDirective)
public children?: QueryList<VirtualListBoxItemDirective>;
@HostBinding('attr.aria-activedescendant')
public get activeDescendant(): string | null {
return this.hasFocus ? this._activeDescendant : null; // Only render active descendant if it has focus otherwise FF & NVDA thinks the list has the focus
}
public set activeDescendant(value: string | null) {
this._activeDescendant = value;
}
public get value(): Key | undefined {
return this._value;
}
@Input()
@Output()
public set value(value: Key | undefined) {
this._value = value;
if (this.children) {
this.children.find(c => c.item.key === value)?.scrollIntoView();
}
}
public _value?: Key;
private focusedListIndex = -1;
private childrenChangeSubscription?: Subscription;
private _activeDescendant: string | null = null;
private hasFocus = false;
private itemSearchText = '';
private clearTimer?: ReturnType<typeof setTimeout>;
constructor(private change: ChangeDetectorRef) {}
@Input()
public itemIdComputer: Converter<Item, string> = i => 'item-' + i.key;
@HostListener('focus', ['$event'])
public _impl_onFocus(): void {
this.hasFocus = true;
if (
this.focusedListIndex === -1 &&
this.children &&
this.children.length > 0
) {
this.updateFocusedIndex(0);
}
// Do not sync with selection - eg windows explorer does not do it either
if (this.focusedListIndex !== -1) {
this.children?.get(this.focusedListIndex)?.scrollIntoView();
}
}
@HostListener('blur', ['$event'])
public _impl_onBlur(): void {
this.hasFocus = false;
}
/** @ignore */
@HostListener('keydown', ['$event'])
public _impl_onKeyDown(event: KeyboardEvent): void {
const key = event.key;
switch (key) {
case 'Enter':
this._impl_onEnter();
event.preventDefault();
break;
case 'ArrowUp':
this._impl_onUp();
event.preventDefault();
break;
case 'ArrowDown':
this._impl_onDown();
event.preventDefault();
break;
case 'End':
this._impl_onEnd();
event.preventDefault();
break;
case 'Home':
this.updateFocusedIndex(0);
event.preventDefault();
break;
default:
if (key === ' ' && this.itemSearchText === '') {
this._impl_onSpace();
event.preventDefault();
} else if (key === ' ' || isPrintableCharacter(key)) {
this.moveByKey(key);
event.preventDefault();
}
}
}
/** @ignore */
public _impl_onSpace(): void {
const el = this.children?.get(this.focusedListIndex);
if (el) {
this.selectItem(el.item.item, false);
}
}
/** @ignore */
public _impl_onEnter(): void {
const el = this.children?.get(this.focusedListIndex);
if (el) {
this.selectItem(el.item.item, true);
}
}
/** @ignore */
public _impl_onDown(): void {
if (this.focusedListIndex == -1) {
this.updateFocusedIndex(0);
} else if (
this.children &&
this.focusedListIndex + 1 < this.children.length
) {
this.updateFocusedIndex(this.focusedListIndex + 1);
}
}
/** @ignore */
public _impl_onUp(): void {
if (this.focusedListIndex == -1 && this.children) {
this.updateFocusedIndex(this.children.length - 1);
} else if (this.focusedListIndex - 1 >= 0) {
this.updateFocusedIndex(this.focusedListIndex - 1);
}
}
public _impl_onEnd(): void {
if (this.children) {
this.updateFocusedIndex(this.children.length - 1);
}
}
ngAfterContentInit(): void {
this.connectMenuItems();
this.childrenChangeSubscription = this.children?.changes.subscribe(() => {
this.connectMenuItems();
// Fix dev exception value change while ...
setTimeout(() => {
this.updateFocusedIndex(
this.children
? this.children.toArray().findIndex(c => c.item.key === this.value)
: -1,
);
});
});
}
ngOnDestroy(): void {
this.childrenChangeSubscription?.unsubscribe();
}
selectItem(item: Item, open: boolean): void {
this.onSelect.emit({ key: item.key, open });
}
updateFocusedIndex(idx: number) {
if (this.focusedListIndex != -1) {
const prevItem = this.children?.get(this.focusedListIndex);
if (prevItem) {
prevItem.focused = false;
}
}
this.focusedListIndex = idx;
const item = this.children?.get(idx);
if (item) {
item.focused = true;
this.activeDescendant = this.itemIdComputer(item.item);
} else {
this.activeDescendant = null;
}
}
private connectMenuItems(): void {
const size = this.children?.length ?? 0;
this.children?.forEach((e, index) => {
e.updateItem(this, index, size);
e.focused = false;
});
this.change.detectChanges();
}
private moveByKey(char: string): void {
const curIdx = this.focusedListIndex === -1 ? 0 : this.focusedListIndex;
const firstSearch = this.itemSearchText === '';
this.itemSearchText += char;
this.clearSearchTimer();
this.clearTimer = setTimeout(() => {
this.itemSearchText = '';
}, 1000);
let indx =
this.children?.toArray().findIndex((itemDirective, idx) => {
const indexCheck = firstSearch ? idx > curIdx : idx >= curIdx;
return (
indexCheck &&
itemDirective.item.label
.toLocaleLowerCase()
.includes(this.itemSearchText.toLocaleLowerCase())
);
}) ?? -1;
if (indx === -1) {
indx =
this.children?.toArray().findIndex((itemDirective, idx) => {
return (
idx <= curIdx &&
itemDirective.item.label
.toLocaleLowerCase()
.includes(this.itemSearchText.toLocaleLowerCase())
);
}) ?? -1;
}
if (indx !== -1 && indx !== curIdx) {
this.updateFocusedIndex(indx);
}
}
private clearSearchTimer() {
if (this.clearTimer !== undefined) {
clearTimeout(this.clearTimer);
this.clearTimer = undefined;
}
}
}
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