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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
AfterViewInit,
Component,
ElementRef,
EventEmitter,
Input,
NgZone,
OnChanges,
OnDestroy,
Output,
QueryList,
ViewChild,
ViewChildren,
} from '@angular/core';
import { isSetEqual, observeSize } from '../utils/internal-utils';
import {
Callback,
Converter,
FocusableElementOwner,
Item,
WidgetKeySet,
} from '../utils/util.types';
import { createWidgetKeySet, isItem, itemTrack } from '../utils/utilities';
import { CheckboxComponent } from '../checkbox/checkbox.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'],
})
export class CheckboxGroupComponent<T, I extends Item = Item>
implements OnChanges, AfterViewInit, OnDestroy, FocusableElementOwner
{
/**
* Custom id to use.
* @deprecated
*/
@Input()
public _id?: string;
/**
* Text that shows within the checkbox group border.
*/
@Input()
public label = '';
/**
* List of items that will be rendered as checkboxes.
*/
@Input()
public items: readonly T[] = [];
/**
* Adapter that manages the conversion of item types.
*/
@Input()
public itemAdapter?: Converter<T, I>;
/**
* Keys of items which are in the readonly mode.
*/
@Input()
public readonlyItems?: ReadonlySet<string>;
/**
* Keys of items which are in the disabled mode.
*/
@Input()
public disabledItems?: ReadonlySet<string>;
/**
* An error message that shows within a checkbox.
*/
@Input()
public errorMessage = '';
/**
* Marks the input field as required.
*/
@Input()
public required = false;
/**
* Inform about the change of the value
*/
@Output()
public readonly valueChange: EventEmitter<ReadonlySet<T>> = new EventEmitter<
ReadonlySet<T>
>();
/**
* @ignore
*/
@ViewChild('error')
private errorMessageElement?: ElementRef<HTMLParagraphElement>;
/**
* @ignore
*/
@ViewChildren(CheckboxComponent)
private checkboxElements?: QueryList<CheckboxComponent>;
/**
* Set of checked items.
*/
@Input()
public get value(): ReadonlySet<T> {
return this._value;
}
public set value(items: ReadonlySet<T>) {
this._value = items;
}
/** @ignore */
readonly _widgetKeys: WidgetKeySet = createWidgetKeySet('gc-checkbox-group');
/**
* @ignore
*/
_convertedItems: readonly Item[] = [];
/**
* @ignore
*/
public _numberOfColumns: 1 | 2 | 3 = 1;
/**
* @ignore
*/
private _value: ReadonlySet<T> = new Set();
/**
* @ignore
*/
private resizeObserver?: Callback;
constructor(
private el: ElementRef<HTMLFieldSetElement>,
private zone: NgZone,
) {}
/**
* @ignore
*/
public _itemTrackBy(index: number, item: Item): string {
return itemTrack(item);
}
/**
* @ignore
*/
ngOnChanges(): void {
this.convertItems();
if (this.errorMessage.length > 0) {
this.setErrorMessageProviderToInputs();
}
}
/**
* @ignore
*/
ngAfterViewInit(): void {
this.resizeObserver = observeSize(
this.el,
this.zone,
this.resizeObserverCallback.bind(this),
);
}
/**
* @ignore
*/
ngOnDestroy(): void {
if (this.resizeObserver) {
this.resizeObserver();
}
}
public focusChild(): boolean {
if (this.checkboxElements) {
const firstNonDisabledElement = this.checkboxElements.find(
el => !el.disabled,
);
if (firstNonDisabledElement) {
return firstNonDisabledElement.focusChild();
} else {
return false;
}
}
return false;
}
/**
* @ignore
*/
_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
*/
public _isChecked(key: string): boolean {
const foundItem = Array.from(this.value).find(
i => this.getAsItem(i).key == key,
);
return foundItem !== undefined;
}
/**
* @ignore
*/
public _computeCellRow(item: Item): null | number {
if (this._numberOfColumns === 1) {
return null;
} else {
const itemsPerColumn = Math.ceil(
this._convertedItems.length / this._numberOfColumns,
);
const idx = this._convertedItems.indexOf(item);
if (idx >= 0) {
return (idx % itemsPerColumn) + 1;
}
return null;
}
}
/**
* @ignore
*/
private convertItems() {
this._convertedItems = Array.from(this.items).map(i => this.getAsItem(i));
}
/**
* @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 {
if (this.itemAdapter === undefined) {
if (isItem(item)) {
return item;
}
throw new Error('missing converter');
} else {
return this.itemAdapter(item);
}
}
/**
* @ignore
*/
private setErrorMessageProviderToInputs(): void {
if (this.errorMessageElement) {
const errorProvider =
this.errorMessageElement.nativeElement.getAttribute('id');
this.checkboxElements?.toArray().forEach(el => {
if (errorProvider && this.checkboxElements) {
el._inputElement.nativeElement.setAttribute(
'errormessage',
errorProvider,
);
}
});
}
}
/**
* @ignore
*/
private resizeObserverCallback(): void {
const elementWidth = this.el.nativeElement.getBoundingClientRect().width;
if (elementWidth < 440) {
this._numberOfColumns = 1;
}
if (elementWidth > 440 && elementWidth < 760) {
this._numberOfColumns = 2;
}
if (elementWidth > 761) {
this._numberOfColumns = 3;
}
if (this.items.length <= 4) {
this._numberOfColumns = 1;
}
}
/**
* @ignore
*/
private updateValue(value: ReadonlySet<T>): void {
if (!isSetEqual(this.value, value)) {
this.value = value;
this.valueChange.emit(value);
}
}
}
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