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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
AfterViewInit,
Component,
ElementRef,
EventEmitter,
Input,
NgZone,
OnChanges,
OnDestroy,
OnInit,
Output,
QueryList,
ViewChildren,
} from '@angular/core';
import { observeSize } from '../utils/internal-utils';
import {
Callback,
Converter,
FocusableElementOwner,
Item,
WidgetKeySet,
} from '../utils/util.types';
import { createWidgetKeySet, isItem, itemTrack } from '../utils/utilities';
import { RadioButtonComponent } from './radio-button.component';
/**
* A Radio Button Group element that allows the user to mark a single value from a group as selected.
*/
@Component({
selector: 'gc-radio-button-group',
templateUrl: './radio-button-group.component.html',
styleUrls: ['./radio-button-group.component.css'],
})
export class RadioButtonGroupComponent<T, I extends Item = Item>
implements OnInit, OnChanges, AfterViewInit, OnDestroy, FocusableElementOwner
{
/** @ignore */
private static NEXT_AUTO_GROUP_ID = 0;
/**
* Custom name to use for the radio group.
*/
@Input()
public groupName?: string;
/**
* Text that shows within the radio button group.
*/
@Input()
public label = '';
/**
* Text that shows within the radio button group.
*/
@Input()
public errorMessage = '';
/**
* List of item keys that will be rendered in the readonly state.
*/
@Input()
public readonlyItems?: ReadonlySet<string>;
/**
* List of item keys that will be rendered in the disabled state.
*/
@Input()
public disabledItems?: ReadonlySet<string>;
/**
* Currently selected value.
*/
@Input()
public value?: T;
/**
* List of items that will be rendered as radio buttons.
*/
@Input()
public items: readonly T[] = [];
/**
* Adapter that manages the conversion of item types.
*/
@Input()
public itemAdapter?: Converter<T, I>;
/**
* Marks the input field as required.
*/
@Input()
public required = false;
/**
* Inform about the change of the value
*/
@Output()
public readonly valueChange: EventEmitter<T | undefined> = new EventEmitter<
T | undefined
>();
/**
* @ignore
*/
@ViewChildren('radioButton')
private radioButtons?: QueryList<RadioButtonComponent>;
/** @ignore */
readonly _widgetKeys: WidgetKeySet = createWidgetKeySet('radio-button-group');
/**
* @ignore
*/
_groupName = '';
/**
* @ignore
*/
_convertedItems: readonly Item[] = [];
/**
* @ignore
*/
public _numberOfColumns: 1 | 2 | 3 = 1;
/**
* @ignore
*/
private resizeObserver?: Callback;
constructor(
private el: ElementRef<HTMLFieldSetElement>,
private zone: NgZone,
) {}
/**
* @ignore
*/
ngOnInit(): void {
this._groupName = this.groupName
? this.groupName
: 'gc-radio-group-' +
(RadioButtonGroupComponent.NEXT_AUTO_GROUP_ID++).toString();
}
/**
* @ignore
*/
ngAfterViewInit(): void {
this.resizeObserver = observeSize(
this.el,
this.zone,
this.updateColumnCount.bind(this),
);
}
/**
* @ignore
*/
ngOnDestroy(): void {
if (this.resizeObserver) {
this.resizeObserver();
}
}
public focusChild(): boolean {
if (this.radioButtons) {
const activeRadioButton = this.radioButtons
.toArray()
.find(btn => btn.value);
const firstNonDisabledButton = this.radioButtons
.toArray()
.find(btn => !btn.disabled);
if (activeRadioButton && !activeRadioButton.disabled) {
return activeRadioButton.focusChild();
} else if (firstNonDisabledButton) {
return firstNonDisabledButton.focusChild();
} else {
return false;
}
}
return false;
}
/**
* @ignore
*/
public _itemTrackBy(index: number, item: Item): string {
return itemTrack(item);
}
/**
* @ignore
*/
ngOnChanges(): void {
this.convertItems();
this.updateColumnCount();
}
/**
* @ignore
*/
_valueChanged(key: string): void {
const foundValue = this.findValueByKey(key);
if (foundValue) {
this.value = foundValue;
this.valueChange.emit(this.value);
}
}
/**
* @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
*/
public _isChecked(key: string): boolean {
const foundItem =
this.value && this.getAsItem(this.value).key === key
? this.getAsItem(this.value).key
: undefined;
return foundItem !== undefined;
}
/**
* @ignore
*/
private convertItems() {
this._convertedItems = Array.from(this.items).map(i => this.getAsItem(i));
}
/**
* @ignore
*/
private findValueByKey(key: string): T | undefined {
return Array.from(this.items).find(i => this.getAsItem(i).key == key);
}
/**
* @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 updateColumnCount(): void {
const elementWidth = this.el.nativeElement.getBoundingClientRect().width;
if (this.items.length <= 4 || elementWidth <= 439) {
this._numberOfColumns = 1;
} else if (elementWidth <= 760) {
this._numberOfColumns = 2;
} else {
this._numberOfColumns = 3;
}
}
}
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