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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
AfterViewInit,
Component,
ElementRef,
EventEmitter,
Input,
NgZone,
OnDestroy,
Output,
QueryList,
TemplateRef,
ViewChild,
ViewChildren,
} from '@angular/core';
import { createResizeObserver } from '../utils/internal-utils';
import {
Callback,
Converter,
FocusableElementOwner,
Item,
} from '../utils/util.types';
import { createWidgetKeySet, isItem, itemTrack } from '../utils/utilities';
import type {
PickerComponent,
TooltipComponent,
WidgetKeySet,
} from '../../public-api';
import { ToggleButtonComponent } from './toggle-button.component';
/**
* A Toggle Button Group component that contains multiple Toggle Button components.
*/
@Component({
selector: 'gc-toggle-button-group',
templateUrl: './toggle-button-group.component.html',
styleUrls: ['./toggle-button-group.component.css'],
})
export class ToggleButtonGroupComponent<T, I extends Item = Item>
implements FocusableElementOwner, OnDestroy, AfterViewInit
{
/**
* A label text to be used for aria-label attribute.
*/
@Input()
public label = '';
/**
* Defines how the content is displayed
* - icon-only: only the icon is shown
* - icon-left: icon is shown on the left of the text
* - text-only: only text is displayed
*/
@Input()
public contentDisplay: 'icon-only' | 'text-only' | 'icon-left' = 'text-only';
/**
* If set to true moving the focus item also selects the item
*/
@Input()
public selectionFollowFocus = false;
/**
* Adapter that manages the conversion of item types.
*/
@Input()
public itemAdapter?: Converter<T, I>;
/**
* Optional template to render icon
*/
@Input()
public iconProvider?: TemplateRef<unknown>;
/**
* Inform about the change of the selection state
*/
@Output()
public readonly valueChange: EventEmitter<T> = new EventEmitter<T>();
/**
* @ignore
*/
@ViewChild('tooltip')
private _tooltip?: TooltipComponent;
/**
* @ignore
*/
@ViewChild('picker')
private pickerElement?: PickerComponent<Item>;
/**
* @ignore
*/
@ViewChild('toggleButtonGroup')
private toggleButtonGroup?: ElementRef<HTMLElement>;
/**
* @ignore
*/
@ViewChildren('toggleButton')
private _toggleButtons?: QueryList<ToggleButtonComponent>;
/**
* List of items that will be rendered as toggle buttons.
*/
@Input()
public get items(): readonly T[] {
return this._items;
}
public set items(value: readonly T[]) {
if (!value.includes(this.value)) {
const idx = this.items.findIndex(e => e == this.value);
if (idx >= 0) {
if (idx < value.length) {
this.value = value[idx];
} else {
if (value[value.length - 1]) {
this.value = value[value.length - 1];
}
}
}
}
this._items = value;
this.convertItems();
}
/**
* Force condensed mode (responsive picker)
* @ignore
*/
@Input()
public get _condensedMode() {
return this._condensedModeInternal;
}
public set _condensedMode(value) {
this._condensedModeInternal = value;
this.responsivePickerEnabled = value;
}
/**
* Currently selected value.
*/
@Input()
public get value(): T {
return this._value;
}
public set value(item: T) {
this._value = item;
}
/**
* @ignore
*/
protected convertedItems: readonly Item[] = [];
/** @ignore */
protected readonly widgetKeys: WidgetKeySet = createWidgetKeySet(
'gc-toggle-button-group',
);
/**
* @ignore
*/
protected responsivePickerEnabled = false;
/**
* @ignore
*/
private _focusedToggleButtonIndex = 0;
/**
* @ignore
*/
private _focused = false;
/** @ignore */
private _condensedModeInternal = false;
/**
* @ignore
*/
private _value!: T;
/**
* @ignore
*/
private _items: readonly T[] = [];
/**
* @ignore
*/
private resizeObserver?: ResizeObserver;
/**
* @ignore
*/
private resizeObserverCleanup?: Callback;
constructor(
private el: ElementRef<HTMLElement>,
private zone: NgZone,
) {}
ngAfterViewInit(): void {
[this.resizeObserver, this.resizeObserverCleanup] = createResizeObserver(
this.zone,
() => this.recomputeResponsiveDesign(),
);
this.resizeObserver.observe(this.el.nativeElement);
if (this.toggleButtonGroup) {
this.resizeObserver.observe(this.toggleButtonGroup.nativeElement);
}
}
/**
* @ignore
*/
ngOnDestroy(): void {
if (this.resizeObserverCleanup) {
this.resizeObserverCleanup();
}
}
focusChild(): boolean {
if (!this.responsivePickerEnabled && this._toggleButtons) {
const activeButton = this._toggleButtons.toArray().find(btn => btn.value);
const firstNonDisabledButton = this._toggleButtons
.toArray()
.find(btn => !btn._buttonElement.nativeElement.disabled);
if (activeButton) {
activeButton._buttonElement.nativeElement.focus();
return true;
} else if (firstNonDisabledButton) {
firstNonDisabledButton._buttonElement.nativeElement.focus();
return true;
} else {
return false;
}
} else if (this.responsivePickerEnabled && this.pickerElement) {
return this.pickerElement.focusChild();
}
return false;
}
/**
* @ignore
*/
_valueChanged(key: string): void {
const foundValue = this.findValueByKey(key);
if (foundValue) {
this.value = foundValue;
this.valueChange.emit(this._value);
}
}
/**
* @ignore
*/
_onFocus(tb: ToggleButtonComponent): void {
const foundIndex = this._toggleButtons?.toArray().indexOf(tb);
if (foundIndex) {
this.updateFocusIndex(foundIndex);
}
}
/**
* @ignore
*/
_onKeyDown(event: KeyboardEvent): void {
const key = event.key;
let flag = false;
switch (key) {
case 'ArrowRight':
case 'ArrowDown':
flag = true;
this.moveToNextToggleButtonIndex();
break;
case 'ArrowLeft':
case 'ArrowUp':
flag = true;
this.moveToPrevToggleButtonIndex();
break;
case 'Home':
flag = true;
this.moveToFirstToggleButtonIndex();
break;
case 'End':
flag = true;
this.moveToLastToggleButtonIndex();
break;
default:
break;
}
this.setFocusToFocusedToggleButtonIndex();
if (flag) {
event.stopPropagation();
event.preventDefault();
}
}
/**
* @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
*/
public _itemTrackBy(index: number, item: Item): string {
return itemTrack(item);
}
/**
* @ignore
*/
public _isFirstInToggleButtonGroup(key: string): boolean {
return Array.from(this.convertedItems)[0].key === key;
}
/**
* @ignore
*/
public _isLastInToggleButtonGroup(key: string): boolean {
const itemsArray = Array.from(this.convertedItems);
return itemsArray[itemsArray.length - 1].key === key;
}
/**
* @ignore
*/
protected toggleButtonFocusChanged(key: string): void {
this.updateFocusIndex(
Array.from(this.convertedItems).findIndex(i => i.key === key),
);
this._focused = true;
}
/**
* @ignore
*/
protected overallFocusChanged(focused: boolean): void {
this._focused = focused;
}
/**
* @ignore
*/
protected getSelectedItem(): Item {
return this.getAsItem(this.value);
}
/**
* @ignore
*/
private recomputeResponsiveDesign(): void {
if (this.toggleButtonGroup) {
const formWidth = this.el.nativeElement.getBoundingClientRect().width;
const groupWidth =
this.toggleButtonGroup.nativeElement.getBoundingClientRect().width;
const groupHeight =
this.toggleButtonGroup.nativeElement.getBoundingClientRect().height;
if (
this.responsivePickerEnabled !==
(groupWidth > formWidth ||
groupHeight > 62 ||
this._condensedModeInternal)
) {
this.responsivePickerEnabled = !this.responsivePickerEnabled;
const focused = this._focused;
setTimeout(() => {
if (
this.responsivePickerEnabled &&
this._tooltip &&
this.pickerElement
) {
this._tooltip.tooltipOwner = this.pickerElement.buttonElement;
}
/* when focused, keep the focus when switching between the responsive modes */
if (focused) {
this.focusChild();
}
});
}
}
}
/**
* @ignore
*/
private moveToNextToggleButtonIndex(): void {
if (this._toggleButtons) {
if (this._focusedToggleButtonIndex + 1 >= this._toggleButtons.length) {
this.updateFocusIndex(0);
} else {
this.updateFocusIndex(this._focusedToggleButtonIndex + 1);
}
}
}
/**
* @ignore
*/
private moveToPrevToggleButtonIndex(): void {
if (this._toggleButtons) {
if (this._focusedToggleButtonIndex - 1 < 0) {
this.updateFocusIndex(this._toggleButtons.length - 1);
} else {
this.updateFocusIndex(this._focusedToggleButtonIndex - 1);
}
}
}
/**
* @ignore
*/
private moveToFirstToggleButtonIndex(): void {
this.updateFocusIndex(0);
}
/**
* @ignore
*/
private moveToLastToggleButtonIndex(): void {
if (this._toggleButtons) {
this.updateFocusIndex(this._toggleButtons.length - 1);
}
}
/**
* @ignore
*/
private setFocusToFocusedToggleButtonIndex(): void {
if (this._toggleButtons) {
this._toggleButtons
.get(this._focusedToggleButtonIndex)
?._buttonElement.nativeElement.focus();
}
}
/** @ignore */
private updateFocusIndex(index: number) {
this._focusedToggleButtonIndex = index;
if (this.selectionFollowFocus && this._toggleButtons) {
this._valueChanged(this.convertedItems[index].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 convertItems() {
this.convertedItems = this.items.map(i => this.getAsItem(i));
}
/**
* @ignore
*/
private findValueByKey(key: string): T | undefined {
return this.items.find(i => this.getAsItem(i).key == key);
}
}
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