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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
AfterViewInit,
ChangeDetectorRef,
Component,
ElementRef,
EventEmitter,
HostBinding,
Input,
IterableDiffers,
NgZone,
OnChanges,
OnDestroy,
Output,
SimpleChanges,
TemplateRef,
ViewChild,
} from '@angular/core';
import {
BaseIndexedItem,
IndexedItem,
isSetEqual,
observeSize,
} from '../utils/internal-utils';
import {
Callback,
FormControlStatus,
Item,
WidgetKeySet,
} from '../utils/util.types';
import { SoundType, createWidgetKeySet, playSound } from '../utils/utilities';
import { LabelContainerComponent } from '../internal/label-container/label-container.component';
import { ListBoxItemDirective } from '../internal/listbox-item.directive';
import {
ListBoxDirective,
SelectionEvent,
} from '../internal/listbox.directive';
import {
BasePickerComponent,
KeyFocusTarget,
} from '../picker/base-picker.component';
const SELECT_ALL_ITEM_KEY: unique symbol = Symbol('select_all');
/**
* A Picker allowing the user to choose an item from a collapsible list of options.
*/
@Component({
selector: 'gc-multi-picker',
templateUrl: './multi-picker.component.html',
styleUrls: ['./multi-picker.component.css'],
})
export class MultiPickerComponent<T, I extends Item = Item>
extends BasePickerComponent<T, I>
implements OnDestroy, AfterViewInit, OnChanges
{
/** Inform about the change of the selection state */
@Output()
public readonly valueChange: EventEmitter<ReadonlySet<T>> = new EventEmitter<
ReadonlySet<T>
>();
/** Controls the separation of items. */
@Input()
public separatorVariant: 'semikolon' | 'komma' = 'semikolon';
/**
* Determines if a short summarized text should be displayed as value when all entries are selected.
* If `true`, a summarized "all" value is shown, if `false` all selected entries are listed invividually.
*/
@Input()
public summarizeAllSelectedValue = true;
/** The label that shows on the input. */
@Input()
public label = '';
/** Marks the input field as required. true == required */
@Input()
public required = false;
/** A hint message that will appear below the picker if set. */
@Input()
public hint = '';
/** Optional icon provider to use for the selected entry */
@Input()
public iconProvider?: TemplateRef<unknown>;
/** Optional icon provider to use for the entries in the popup list */
@Input()
public listIconProvider?: TemplateRef<unknown>;
/** Decides whether large or small icons appearing. */
@Input()
public smallIcons = false;
/**
* Overrides the default text which is shown when the control is readonly and empty.
*/
@Input()
public readonlyEmptyValue = '';
/**
* If true, the component will be rendered in a slot-element mode.
* This enables the component to be used in two-slot components (e.g. `gc-two-slot-label-container`).
* @ignore
*/
@Input()
public _slotElementMode?: 'ext-search-single-field';
/**
* Error message id used when `_slotElementMode` is enabled.
* @ignore
*/
@Input()
public _errorMessageId?: string;
/**
* Info (hint) message id used when `_slotElementMode` is enabled.
* @ignore
*/
@Input()
public _infoMessageId?: string;
/**
* Enables setting of the value only when the Promise resolves with value "true".
*/
@Input()
public permitValueChange?: (v: ReadonlySet<T>) => Promise<boolean> | boolean;
/**
* Signals changes of the current (combined) status of the component, e.g. also reports errors triggered by internal
* validation or input handling.
*/
@Output()
public readonly onStatusChange: EventEmitter<FormControlStatus> =
new EventEmitter<FormControlStatus>(true);
/** @ignore */
@Output()
public readonly _onHideFocusBorder: EventEmitter<boolean> =
new EventEmitter<boolean>();
/** @ignore */
@ViewChild(LabelContainerComponent)
public labelContainer?: LabelContainerComponent;
/** @ignore */
@ViewChild('drawerSlot')
public drawerSlot?: ElementRef;
/** @ignore */
@ViewChild('button')
private button?: ElementRef<HTMLElement>;
/** @ignore */
@ViewChild('itemArea')
private itemArea?: ElementRef<HTMLSpanElement>;
/** @ignore */
@ViewChild(ListBoxDirective)
private listbox?: ListBoxDirective;
/**
* The value represents the selected values.
*/
@Input()
public get value(): ReadonlySet<T> {
return this._value;
}
public set value(value: ReadonlySet<T>) {
this.storage.multiSelected = value;
this._value = this.storage.multiSelected;
}
/** Determines if select all entry should be shown. */
@Input()
public get showSelectAll() {
return this._showSelectAll;
}
public set showSelectAll(value) {
this.storage.startingIndex = value ? this.selectAllItem.index + 1 : 0;
this._showSelectAll = value;
}
/** An error message that will appear below the picker if set. */
@Input()
public set errorMessage(message: string) {
if (this._errorMessage !== message) {
this._errorMessage = message;
this.emitStatusChange();
}
}
public get errorMessage(): string {
return this._errorMessage;
}
/**
* @ignore
* backwards compat for older Firefox (<121) only
*/
@HostBinding('class.gc-disabled')
protected get disabledCssClass(): boolean {
return this.disabled;
}
/** @ignore */
public _impl_id?: string;
/** @ignore */
public _impl_listbox_id?: string;
/** @ignore */
public _impl_visibleLabelId?: string;
/** @ignore */
public _sortedItems: IndexedItem<T, I>[] = [];
/** @ignore */
public focusItemId: string | undefined;
/** @ignore */
protected readonly selectAllItem: BaseIndexedItem = {
index: 0,
key: SELECT_ALL_ITEM_KEY,
label: 'Alle Einträge auswählen',
};
/** @ignore */
protected readonly _widgetKeys: WidgetKeySet = createWidgetKeySet(
'gc-multi-picker-input',
);
/** @ignore */
private _errorMessage = '';
/** @ignore */
private _resizeObserver?: Callback;
/** @ignore */
private _showSelectAll = false;
private _value: ReadonlySet<T> = new Set();
constructor(
private zone: NgZone,
private change: ChangeDetectorRef,
itDiff: IterableDiffers,
) {
super(itDiff);
}
/** @ignore */
_impl_onItemFocus(item: ListBoxItemDirective | undefined) {
this.focusItemId = item?.itemId;
}
/** @ignore */
_impl_button_onKeydown(event: KeyboardEvent) {
if (this._impl_drawerOpen) {
// send event to listbox
this.listbox?.handleKeyDown(event);
}
}
/** @ignore */
public ngOnChanges(changes: SimpleChanges): void {
if (
'items' in changes ||
'itemAdapter' in changes ||
'showSelectAll' in changes
) {
this.storage.update();
}
}
/** @ignore */
public override ngAfterViewInit(): void {
this._impl_id = this.autoIdDirective?.autoId;
this._impl_listbox_id = (this._impl_id ?? '') + '_listbox';
this._impl_visibleLabelId = (this.autoIdDirective?.labelId ?? '') + '_vis';
if (this.itemArea) {
this._resizeObserver = observeSize(
this.itemArea,
this.zone,
this._resizeCallback.bind(this),
);
}
this.change.detectChanges();
super.ngAfterViewInit();
}
/** @ignore */
public ngOnDestroy(): void {
if (this._resizeObserver) {
this._resizeObserver();
}
}
/** @ignore */
computeReadonlyText(): string {
let result = '';
const list: string[] = [];
this.storage.multiSelectedItems.forEach(item => list.push(item.label));
for (let idx = 0; idx < list.length; idx++) {
result += list[idx];
if (this.separatorVariant == 'semikolon' && idx != list.length - 1) {
result += '; ';
}
if (this.separatorVariant == 'komma') {
if (idx == list.length - 2) {
result += ' und ';
} else if (idx != list.length - 1) {
result += ', ';
}
}
}
return result;
}
/** @ignore */
public _isSelected(item: Item): boolean {
return this.storage._multiSelectedKeys.has(item.key);
}
/** @ignore */
public _isAllSelected(): boolean {
return (
this.storage.indexItems.length > 0 &&
this.storage.indexItems
.map(it => this._isSelected(it))
.reduce((l, r) => l && r)
);
}
/** @ignore */
public _toggleSelectAll(): void {
if (this._isAllSelected()) {
this._impl_handleChange(new Set());
} else {
this._impl_handleChange(
new Set<T>(this.storage.indexItems.map(it => it.value)),
);
}
}
/** @ignore */
public override getAnker(): ElementRef {
if (this.labelContainer) {
return this.labelContainer.drawerSlot;
} else if (this.drawerSlot) {
return this.drawerSlot;
}
throw new Error('Unable to find a drawer slot');
}
/** @ignore */
public override getScrollTarget(): ElementRef<HTMLElement> | undefined {
return this.labelContainer?.boxEl;
}
/** @ignore */
public override _impl_onFocusLeft(event?: EventTarget | null): void {
super._impl_onFocusLeft(event);
// We need to wait a tick so that the control is back
// in a sync state
setTimeout(() => {
if (this.errorMessage.length > 0) {
void playSound(SoundType.ERROR);
}
});
}
/** @ignore */
public _impl_onLabelClick(): void {
if (!this.disabled) {
this.button?.nativeElement.focus();
this.button?.nativeElement.click();
}
}
/** @ignore */
public _impl_onSelect(event: SelectionEvent): void {
if (event.key === this.selectAllItem.key) {
this._toggleSelectAll();
if (event.source === 'enter') {
void this._impl_close();
}
return;
}
const value =
typeof event.key === 'string'
? this.storage.getValueByKey(event.key)
: undefined;
if (value !== undefined) {
// toggle
const newValue = new Set(this.storage.multiSelected);
if (newValue.has(value)) {
newValue.delete(value);
} else {
newValue.add(value);
}
this._impl_handleChange(newValue);
}
if (event.source === 'enter') {
void this._impl_close();
}
}
/** @ignore */
public _impl_handleChange(value: ReadonlySet<T>): void {
this.storage.multiSelected = value;
}
/** @ignore */
protected getLabelId(): string {
return this._widgetKeys.labelKey;
}
/** @ignore */
protected getButtonId(): string {
return this._widgetKeys.baseKey + '-button';
}
/** @ignore */
protected computeAriaDescribedBy(): string | null {
const errId = this._errorMessageId;
const hintId = this._infoMessageId;
if (errId && hintId) {
return hintId + ' ' + errId;
} else if (errId) {
return errId;
} else if (hintId) {
return hintId;
} else {
return null;
}
}
/** @ignore */
protected override _impl_onOpen(focusItem: KeyFocusTarget): KeyFocusTarget {
// sort once, selected on top
const selectedFirstCmp = (
a: IndexedItem<T, I>,
b: IndexedItem<T, I>,
): number => (this._isSelected(b) ? 1 : 0) - (this._isSelected(a) ? 1 : 0);
this._sortedItems = this.storage.indexItems
.map(i => i)
.sort(selectedFirstCmp);
// emit true if button is focused and the closed drawer is going to be opened
this._onHideFocusBorder.emit(
this.isButtonFocused() && !this._impl_drawerOpen,
);
return focusItem;
}
/** @ignore */
protected _impl_onButtonBlur(event: FocusEvent) {
if (
this.popup?.visible &&
(event.relatedTarget === null || event.relatedTarget === document.body)
) {
super._impl_close(false);
this.zone.runOutsideAngular(() => {
requestAnimationFrame(() => {
this.buttonElement?.nativeElement.focus();
});
});
}
}
/** @ignore */
protected override async _impl_close(): Promise<void> {
super._impl_close(false);
this.focusItemId = undefined;
if (!isSetEqual(this.storage.multiSelected, this.value)) {
const doChange = () => {
this.value = this.storage.multiSelected;
this.valueChange.emit(this.storage.multiSelected);
};
if (this.permitValueChange !== undefined) {
// Await focus transferable to complete so that it is restored
// after the dialog opened
await new Promise(res => setTimeout(res));
const permit = this.permitValueChange(this.storage.multiSelected);
if (typeof permit !== 'boolean') {
const proceed = await permit;
if (proceed) {
doChange();
} else {
this.storage.multiSelected = this.value;
}
} else if (permit) {
doChange();
} else {
this.storage.multiSelected = this.value;
}
} else {
doChange();
}
}
// emit false if button is focused and opened drawer is going to be closed
this._onHideFocusBorder.emit(
this.isButtonFocused() && this._impl_drawerOpen,
);
}
/** @ignore */
protected charactersExceedingLimit(): boolean {
return (
this.computeReadonlyText().length > this._characterLimit() &&
this.storage.multiSelected.size > 1
);
}
/** @ignore */
private emitStatusChange() {
const status: FormControlStatus = {};
if (this.errorMessage) {
status.error = [this.errorMessage];
}
this.onStatusChange.emit(status);
}
/** @ignore */
private _resizeCallback(): void {
if (this._impl_drawerOpen && this.popup) {
void this.popup._handleAttach();
}
}
/** @ignore */
private _characterLimit(): number {
return this.iconProvider ? 18 : 24;
}
}
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