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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
Component,
Directive,
ElementRef,
EventEmitter,
HostBinding,
HostListener,
Input,
Output,
TemplateRef,
} from '@angular/core';
import {
FocusableElementOwner,
Item,
Key,
TreeItemBasic,
WidgetKeySet,
} from '../../utils/util.types';
import {
createWidgetKeySet,
isTreeItemBasic,
itemTrack,
} from '../../utils/utilities';
import {
BaseTreeComponent,
TreeItemBasicAdvancedKeys,
} from '../../tree/base-tree.component';
interface RecursiveTreePickerItemTemplateContext<T> {
$implicit: RecursiveTreeItem<T>[];
level: number;
}
@Directive({
selector: '[data-gc-tree-picker-item]',
standalone: false,
})
export class TreePickerItemDirective {
@Input('aria-level')
@HostBinding('attr.aria-level')
public ariaLevel = 1;
}
/**
* A directive allowing to tag template directives who get passed
* an $implicit value who is that least of type T
*/
@Directive({
selector: 'ng-template[data-gc-recursive-tree-picker-item]',
standalone: false,
})
export class RecursiveTreePickerItemTemplateDirective<T> {
@Input('data-gc-recursive-tree-picker-item')
public typeToken!: T;
constructor(
public readonly template: TemplateRef<
RecursiveTreePickerItemTemplateContext<T>
>,
) {}
/**
* @ignore
*/
static ngTemplateContextGuard<T>(
_dir: RecursiveTreePickerItemTemplateDirective<T>,
ctx: unknown,
): ctx is RecursiveTreePickerItemTemplateContext<T> {
return true;
}
}
type RecursiveTreeItem<T> = TreeItemBasicAdvancedKeys<RecursiveTreeItem<T>> & {
parent: RecursiveTreeItem<T> | undefined;
value: T | null;
};
/**
* Picker Tree is used for representing items in the Tree Picker.
*/
@Component({
selector: 'gc-tree-picker-popup-content',
templateUrl: './tree-picker-popup-content.component.html',
styleUrls: [
'../../utils/styles/reset-list.css',
'./tree-picker-popup-content.component.css',
],
standalone: false,
})
export class TreePickerPopupContentComponent<T>
extends BaseTreeComponent<
T | null,
TreeItemBasicAdvancedKeys<T>,
RecursiveTreeItem<T>
>
implements FocusableElementOwner
{
/** An id of the root list element */
@Input()
public listId?: string;
/**
* Set of item keys that will be rendered as disabled items.
*/
@Input()
public disabledItems: ReadonlySet<string | symbol> = new Set();
/**
* Informs about the change of the selected item.
*/
@Output()
public readonly valueChange: EventEmitter<T | null | undefined> =
new EventEmitter<T | null | undefined>();
/**
* Informs about the focus leaving the tree component.
*/
@Output()
readonly onFocusLeave: EventEmitter<void> = new EventEmitter<void>();
/**
* Forwards keyboard events for external use.
*/
@Output()
readonly onKeyboardEvent: EventEmitter<KeyboardEvent> =
new EventEmitter<KeyboardEvent>();
/**
* Request a popup close
*/
@Output()
readonly onRequestClose: EventEmitter<void> = new EventEmitter<void>();
/**
* Data that will be rendered as tree items/nodes.
*/
@Input()
public override items: readonly (T | null)[] = [];
/**
* If true, the component will be rendered in a slot-element mode.
* @ignore
*/
@Input()
public _slotElementMode?: 'ext-search-single-field';
/**
* Enables setting of the value only when the Promise resolves with value "true".
*/
@Input()
public permitValueChange?: (v: T | null) => Promise<boolean> | boolean;
/** @ignore */
readonly _widgetKeys: WidgetKeySet = createWidgetKeySet('gc-tree-picker-pop');
/** @ignore */
protected _focusedItem?: RecursiveTreeItem<T>;
/** @ignore */
protected readonly typeToken!: T; // required to get the generic type into the directive context, see https://github.com/angular/angular/issues/28731
constructor(private host: ElementRef<HTMLElement>) {
super(false);
}
/** @ignore */
@HostListener('keydown', ['$event'])
async onKeyDown(event: KeyboardEvent): Promise<void> {
const key = event.key;
const focusedItem = this._focusedItem;
if (focusedItem) {
switch (key) {
case 'Enter':
case ' ':
await this.handleSubmitButtons();
event.preventDefault();
break;
default:
super.handleItemKeyEvent(event, focusedItem);
}
this.onKeyboardEvent.emit(event);
}
}
/** @ignore */
public focusChild(): boolean {
const focusable = this.host.nativeElement.querySelector<HTMLElement>(
'[role="treeitem"][tabindex="0"]',
);
if (focusable) {
focusable.focus();
return true;
}
return false;
}
/** @ignore */
public _getSelectedItemLabel(): string | undefined {
return this._selectedItemKey !== undefined
? this.getItemByKey(this._selectedItemKey)?.label
: undefined;
}
/** @ignore */
public _generateLabelsOfSelectedItemPath(): string[] {
if (this._selectedItemKey) {
let path: string[] = [];
let item = this.getItemByKey(this._selectedItemKey);
while (item !== undefined) {
path = [item.label, ...path];
item = item.parent;
}
return path;
}
return [];
}
/** @ignore */
protected async _onItemClick(
event: MouseEvent,
item: RecursiveTreeItem<T>,
): Promise<void> {
this._focusItem(item);
if (!this.disabledItems.has(item.key) && event.button === 0) {
event.preventDefault();
event.stopPropagation();
if (this.value === item.value) {
this.onRequestClose.emit();
return;
}
const doChange = () => {
this.value = item.value;
this.valueChange.emit(this.value);
};
if (this.permitValueChange) {
const permit = await this.permitValueChange(
item.value === undefined ? null : item.value,
);
if (permit) {
doChange();
} else {
this.onRequestClose.emit();
}
} else {
doChange();
}
}
}
/** @ignore */
protected _onFocus(item: RecursiveTreeItem<T>): void {
this._focusedItem = item;
}
/** @ignore */
protected _onArrowClick(event: MouseEvent, item: RecursiveTreeItem<T>): void {
event.preventDefault();
event.stopPropagation();
if (!this.isEndNode(item)) {
this.toggleExpandedState(item);
}
}
/** @ignore */
protected _isFirstItem(item: RecursiveTreeItem<T>): boolean {
return this._items[0].key === item.key;
}
/** @ignore */
protected _getInitialTabIndex(item: RecursiveTreeItem<T>): number {
return this._isFirstItem(item) ? 0 : -1;
}
/** @ignore */
protected _isSelectedItem(item: RecursiveTreeItem<T>): boolean {
return this._selectedItemKey === item.key;
}
/** @ignore */
protected _shouldHaveInitialFocus(item: RecursiveTreeItem<T>): boolean {
const firstItemKey = this._items[0].key;
return this._selectedItemKey === undefined && firstItemKey === item.key;
}
/** @ignore */
protected _itemTrackBy(
_index: number,
item: Omit<Item, 'key'> & { key: symbol | string },
): string {
return itemTrack({
key:
typeof item.key === 'string'
? 'k-' + item.key
: 's-' + item.key.toString(),
label: item.label,
});
}
/** @ignore */
protected treeItemId(key: Key | symbol): string {
if (typeof key === 'string') {
return this._widgetKeys.widgetKey + '-i-' + key;
} else {
return (
this._widgetKeys.widgetKey +
'-is-' +
key.toString().replace(/[()]/g, '-')
);
}
}
/** @ignore */
protected treeGroupId(itemKey: Key | symbol): string {
if (typeof itemKey === 'string') {
return this._widgetKeys.widgetKey + '-g-' + itemKey;
} else {
return (
this._widgetKeys.widgetKey +
'-gs-' +
itemKey.toString().replace(/[()]/g, '-')
);
}
}
/** @ignore */
protected override isBaseItem(x: unknown): x is TreeItemBasic<T> {
return isTreeItemBasic(x);
}
/** @ignore */
protected override createGroupItem(
base: RecursiveTreeItem<T>,
): RecursiveTreeItem<T> {
return base;
}
/** @ignore */
protected override createItem(
value: T,
converted: TreeItemBasicAdvancedKeys<T>,
parent: RecursiveTreeItem<T> | undefined,
children: RecursiveTreeItem<T>[] | undefined,
): RecursiveTreeItem<T> {
return { ...converted, parent, children, value };
}
/** @ignore */
protected override scrollToSelectedItem(): void {
// do nothing
}
/** @ignore */
protected _focusItem(item: RecursiveTreeItem<T>): void {
this.getNativeElementForItem(item).focus();
}
/** @ignore */
private async handleSubmitButtons(): Promise<void> {
if (this._focusedItem && !this.disabledItems.has(this._focusedItem.key)) {
if (this.value === this._focusedItem.value) {
this.onRequestClose.emit();
return;
}
const doChange = () => {
if (this._focusedItem) {
this._selectedItemKey = this._focusedItem.key;
this.valueChange.emit(this.value);
}
};
if (this.permitValueChange) {
const permit = await this.permitValueChange(
this._focusedItem.value === undefined
? null
: this._focusedItem.value,
);
if (permit) {
doChange();
} else {
this.onRequestClose.emit();
}
} else {
doChange();
}
}
}
/** @ignore */
private getNativeElementForItem(item: RecursiveTreeItem<T>): HTMLElement {
const element = document.getElementById(this.treeItemId(item.key));
if (!element) {
throw new Error(
`failed to find HTML element for item ${item.key.toString()}`,
);
} else {
return element;
}
}
}
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