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AfterContentInit,
ChangeDetectorRef,
ContentChildren,
Directive,
ElementRef,
EventEmitter,
HostBinding,
Input,
Output,
QueryList,
} from '@angular/core';
import { isPrintableCharacter } from '../utils/internal-utils';
import { Item, Key } from '../utils/util.types';
import { ListBoxItemDirective } from './listbox-item.directive';
export const FocusTargetFirst: unique symbol = Symbol('first');
export const FocusTargetLast: unique symbol = Symbol('last');
export const FocusTargetPrev: unique symbol = Symbol('prev');
export const FocusTargetNext: unique symbol = Symbol('next');
export interface SelectionEvent {
key: Key | symbol;
source: 'space' | 'enter' | 'programmatic';
}
@Directive({
selector: '[data-gc-listbox]',
standalone: false,
})
export class ListBoxDirective implements AfterContentInit {
@ContentChildren(ListBoxItemDirective)
public children!: QueryList<ListBoxItemDirective>;
@Output('listbox-onSelect')
public readonly onSelect: EventEmitter<SelectionEvent> =
new EventEmitter<SelectionEvent>();
@Output('listbox-onCancel')
public readonly onCancel: EventEmitter<void> = new EventEmitter<void>();
@Input('listbox-value')
public value?: Key | symbol;
@Input('listbox-values')
public values?: ReadonlySet<Key>;
@Input('listbox-id')
@HostBinding('attr.id')
public listboxId?: string;
@Input('listbox-focus-mode')
public focusMode: 'native' | 'virtual' = 'native';
@Output('listbox-onItemFocus')
public readonly onItemFocus: EventEmitter<ListBoxItemDirective> =
new EventEmitter<ListBoxItemDirective>();
@HostBinding('attr.role')
readonly role = 'listbox';
@Input({ required: true, alias: 'listbox-disabledItems' })
public disabledItems: ReadonlySet<string> = new Set();
private itemTextStart = '';
private _focused?: ListBoxItemDirective;
private clearTimer?: ReturnType<typeof setTimeout>;
constructor(
private el: ElementRef,
private change: ChangeDetectorRef,
) {}
public isFocused(item: ListBoxItemDirective): boolean {
return this._focused == item;
}
public handleKeyDown(event: KeyboardEvent) {
const key = event.key;
let flag = false;
switch (key) {
case 'Enter':
case ' ':
{
const focused = this.findFocusedChild();
if (focused) {
this.selectItem(
focused.item.key,
key === 'Enter' ? 'enter' : 'space',
);
}
}
flag = true;
break;
case 'Escape':
this.cancel();
flag = true;
break;
case 'ArrowDown':
flag = true;
this.moveFocusToNextItem();
break;
case 'ArrowUp':
this.moveFocusToPrevItem();
flag = true;
break;
case 'Home':
case 'PageUp':
this.moveFocusToFirstItem();
flag = true;
break;
case 'End':
case 'PageDown':
this.moveFocusToLastItem();
flag = true;
break;
case 'Tab':
this.onCancel.emit();
break;
default:
if (isPrintableCharacter(key)) {
this.moveByKey(key);
flag = true;
}
}
if (flag) {
event.stopPropagation();
event.preventDefault();
}
}
isKeySelected(key: Key | symbol): boolean {
if (typeof key === 'string' && this.values) {
return this.values.has(key);
} else {
return this.value === key;
}
}
ngAfterContentInit(): void {
this.connectMenuItems();
this.children.changes.subscribe(() => this.connectMenuItems());
}
containsFocus(): boolean {
return this.children.toArray().some(child => child.isFocused());
}
getChildByItem(item: Item): ListBoxItemDirective | undefined {
return this.children.toArray().find(it => it.key == item.key);
}
getChildByKey(key: string): ListBoxItemDirective | undefined {
return this.children.toArray().find(it => it.key == key);
}
getChildByIndex(index: number): ListBoxItemDirective | undefined {
return this.children.toArray()[index];
}
focusItem(item: ListBoxItemDirective | undefined) {
this._focused = item;
if (this.focusMode === 'native') {
item?.focusNative();
} else {
this.onItemFocus.emit(item);
}
}
focusItemByKey(
key:
| Key
| undefined
| typeof FocusTargetFirst
| typeof FocusTargetLast
| typeof FocusTargetPrev
| typeof FocusTargetNext,
): void {
if (key === FocusTargetFirst || key === undefined) {
this.moveFocusToFirstItem();
} else if (key === FocusTargetLast) {
this.moveFocusToLastItem();
} else if (key === FocusTargetNext) {
this.moveFocusToNextItem();
} else if (key === FocusTargetPrev) {
this.moveFocusToPrevItem();
} else {
const child = this.getChildByKey(key);
child?.focus();
child?.scrollIntoView();
}
}
focusItemByIndex(index: number): void {
const child = this.getChildByIndex(index);
child?.focus();
child?.scrollIntoView();
}
moveFocusToNextItem(): void {
const cur = this.findFocusedChild();
if (cur == undefined) {
this.moveFocusToFirstItem();
} else {
const idx = this.children.toArray().indexOf(cur);
if (idx + 1 < this.children.toArray().length) {
this.focusItemByIndex(idx + 1);
}
}
}
moveFocusToPrevItem(): void {
const cur = this.findFocusedChild();
if (cur == undefined) {
this.moveFocusToFirstItem();
} else {
const idx = this.children.toArray().indexOf(cur);
if (idx - 1 < this.children.toArray().length && idx - 1 >= 0) {
this.focusItemByIndex(idx - 1);
}
}
}
moveFocusToFirstItem(): void {
this.focusItemByIndex(0);
}
moveFocusToLastItem(): void {
this.focusItemByIndex(this.children.toArray().length - 1);
}
selectItem(
key: Key | symbol,
source: 'space' | 'enter' | 'programmatic',
): void {
if (typeof key === 'string' && this.disabledItems.has(key)) {
this.focusItemByKey(key);
} else {
this.onSelect.emit({ key, source });
}
this.itemTextStart = '';
this.clearSearchTimer();
}
cancel(): void {
this.onCancel.emit();
this.itemTextStart = '';
this.clearSearchTimer();
}
selectItemByKey(key: Key): void {
const it = this.getChildByKey(key)?.item.key;
if (it != undefined) {
this.selectItem(it, 'programmatic');
}
}
moveByKey(char: string): void {
const cur = this.findFocusedChild();
const curIdx = cur == undefined ? 0 : this.children.toArray().indexOf(cur);
this.itemTextStart += char;
this.clearSearchTimer();
this.clearTimer = setTimeout(() => {
this.itemTextStart = '';
}, 1000);
let indx = this.children.toArray().findIndex((itemDirective, idx) => {
return (
idx >= curIdx &&
itemDirective.label
.toLocaleLowerCase()
.startsWith(this.itemTextStart.toLocaleLowerCase())
);
});
if (indx === -1) {
indx = this.children.toArray().findIndex((itemDirective, idx) => {
return (
idx <= curIdx &&
itemDirective.label
.toLocaleLowerCase()
.startsWith(this.itemTextStart.toLocaleLowerCase())
);
});
}
if (indx !== -1 && indx !== curIdx) {
this.focusItemByIndex(indx);
}
}
private clearSearchTimer() {
if (this.clearTimer !== undefined) {
clearTimeout(this.clearTimer);
this.clearTimer = undefined;
}
}
private connectMenuItems(): void {
const size = this.children.length;
this.children.forEach((e, index) => {
e.updateItem(this, index, size);
});
this.change.detectChanges();
}
private findFocusedChild(): ListBoxItemDirective | undefined {
return this.children.toArray().find(child => child.isFocused());
}
}
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