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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
Component,
ElementRef,
computed,
effect,
input,
model,
viewChild,
viewChildren,
} from '@angular/core';
import { isSetEqual } from '../utils/internal-utils';
import {
Converter,
FocusableElementOwner,
Item,
WidgetKeySet,
} from '../utils/util.types';
import { createWidgetKeySet, isItem, itemTrack } from '../utils/utilities';
import { CheckboxComponent } from '../checkbox/checkbox.component';
import { TextInputComponent } from '../text-input-field/text-input-field.component';
/**
* A Checkbox Group element that allows the user to mark an arbitrary number of values as
* selected from a set of different checkboxes.
*/
@Component({
selector: 'gc-checkbox-group',
templateUrl: './checkbox-group.component.html',
styleUrls: ['./checkbox-group.component.css'],
standalone: false,
})
export class CheckboxGroupComponent<T, I extends Item = Item>
implements FocusableElementOwner
{
/**
* Text that shows within the checkbox group border.
*/
public readonly label = input('');
/**
* List of items that will be rendered as checkboxes.
*/
public readonly items = input<readonly T[]>([]);
/**
* Adapter that manages the conversion of item types.
*/
public readonly itemAdapter = input<Converter<T, I>>();
/**
* Keys of items which are in the readonly mode.
* @deprecated - use new readonly input instead.
*/
public readonly readonlyItems = input<ReadonlySet<string>>(new Set());
/**
* Keys of items which are in the disabled mode.
*/
public readonly disabledItems = input<ReadonlySet<string>>(new Set());
/**
* An error message that shows within a checkbox.
*/
public readonly errorMessage = input('');
/**
* Marks the input field as required.
*/
public readonly required = input(false);
/**
* Decides if the checkboxgroup will be rendered in a readonly state
*/
public readonly readonly = input(false);
/**
* Enables setting of the value only when the Promise resolves with value "true".
*/
public readonly permitValueChange =
input<(t: ReadonlySet<T>) => Promise<boolean> | boolean>();
/**
* Set of checked items.
*/
public readonly value = model<ReadonlySet<T>>(new Set());
/** @ignore */
protected readonly readonlyTextInput =
viewChild<TextInputComponent>('readonlyTextInput');
/** @ignore */
protected readonly _widgetKeys: WidgetKeySet =
createWidgetKeySet('gc-checkbox-group');
/**
* @ignore
*/
protected readonly convertedItems = computed(() =>
Array.from(this.items()).map(i => this.getAsItem(i)),
);
/**
* @ignore
*/
protected readonly readonlyValues = computed(() => {
return this.convertedItems()
.filter(i => this.isChecked(i.key))
.map(i => i.label)
.join('; ');
});
/**
* @ignore
*/
private readonly errorMessageElement =
viewChild<ElementRef<HTMLParagraphElement>>('error');
/**
* @ignore
*/
private readonly checkboxElements = viewChildren(CheckboxComponent);
public constructor() {
effect(() => {
if (this.errorMessage().length > 0) {
this.setErrorMessageProviderToInputs();
}
});
}
public focusChild(): boolean {
const readonly = this.readonly();
const readonlyTextInput = this.readonlyTextInput();
if (readonly && readonlyTextInput) {
return readonlyTextInput.focusChild();
} else {
const firstNonDisabledElement = this.checkboxElements().find(
el => !el.disabled(),
);
if (firstNonDisabledElement) {
return firstNonDisabledElement.focusChild();
} else {
return false;
}
}
}
/** @ignore */
protected itemTrackBy(index: number, item: Item): string {
return itemTrack(item);
}
/**
* @ignore
*/
protected valueChanged(key: string, checked: boolean): void {
const foundValue = this.findValueByKey(key);
if (foundValue) {
if (checked) {
this.updateValue(new Set([...this.value(), foundValue]));
} else {
this.updateValue(
new Set(Array.from(this.value()).filter(val => foundValue != val)),
);
}
}
}
/** @ignore */
protected isChecked(key: string): boolean {
const foundItem = Array.from(this.value()).find(
i => this.getAsItem(i).key == key,
);
return foundItem !== undefined;
}
/** @ignore */
protected convertPermitValueChange(
key: string,
): (b: boolean) => boolean | Promise<boolean> {
const foundValue = this.findValueByKey(key);
const permitValueChange = this.permitValueChange();
return checked => {
if (foundValue && permitValueChange !== undefined) {
if (checked) {
return permitValueChange(new Set([...this.value(), foundValue]));
} else {
return permitValueChange(
new Set(Array.from(this.value()).filter(val => foundValue != val)),
);
}
} else {
return true;
}
};
}
/**
* @ignore
*/
private findValueByKey(key: string): T | null {
const foundVal = Array.from(this.items()).find(
i => this.getAsItem(i).key == key,
);
return foundVal ?? null;
}
/**
* @ignore
*/
private getAsItem(item: T): Item {
const itemAdapter = this.itemAdapter();
if (itemAdapter === undefined) {
if (isItem(item)) {
return item;
}
throw new Error('missing converter');
} else {
return itemAdapter(item);
}
}
/**
* @ignore
*/
private setErrorMessageProviderToInputs(): void {
const errorMessageElement = this.errorMessageElement();
const checkboxElements = this.checkboxElements();
if (errorMessageElement) {
const errorProvider =
errorMessageElement.nativeElement.getAttribute('id');
for (const el of checkboxElements) {
const inputElement = el._inputElement();
if (errorProvider && inputElement) {
inputElement.nativeElement.setAttribute(
'errormessage',
errorProvider,
);
}
}
}
}
/**
* @ignore
*/
private updateValue(value: ReadonlySet<T>): void {
if (!isSetEqual(this.value(), value)) {
this.value.set(value);
}
}
}
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