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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
AfterViewInit,
Component,
ElementRef,
EventEmitter,
Input,
NgZone,
OnChanges,
OnDestroy,
Output,
SimpleChanges,
ViewChild,
} from '@angular/core';
import {
isOnlyAltPressedOrNothing,
observeSize,
} from '../utils/internal-utils';
import {
Callback,
Converter,
FormControlStatus,
Key,
TreeItem,
} from '../utils/util.types';
import {
SoundType,
createWidgetKeySet,
isTreeItemBasic,
playSound,
} from '../utils/utilities';
import {
AutoIdDirective,
LabelContainerComponent,
} from '../internal/label-container/label-container.component';
import { OverlayContainerComponent } from '../internal/overlay-container/overlay-container.component';
import { TreeItemBasicAdvancedKeys } from '../tree/base-tree.component';
import { TreePickerPopupContentComponent } from './tree-picker-popup-content/tree-picker-popup-content.component';
const NO_VALUE_ITEM_SYMBOL: unique symbol = Symbol('no-value');
/**
* A Tree Picker allowing the user to choose an item from a list of tree items.
*/
@Component({
selector: 'gc-tree-picker',
templateUrl: './tree-picker.component.html',
styleUrls: ['./tree-picker.component.css'],
})
export class TreePickerComponent<T>
implements OnChanges, OnDestroy, AfterViewInit
{
/** The label that shows on the input. */
@Input()
public label = '';
/** Marks the input field as required. true == required */
@Input()
public required = false;
/** Marks the input field as disabled. true == disabled */
@Input()
public disabled = false;
/** Marks the input field as readonly. true == readonly */
@Input()
public readonly = false;
/**
* Overrides the default text which is shown when the control is readonly and empty.
*/
@Input()
public readonlyEmptyValue = '';
/** A hint message that will appear below the picker if set. */
@Input()
public hint = '';
/**
* Data that will be rendered as tree items/nodes.
*/
@Input()
public items: readonly (T | null)[] = [];
/**
* Enables resetting the value i.e. the selection of a no-value (null) item.
*/
@Input()
public resetEnabled = false;
/**
* Set of item keys that will be rendered as disabled items.
*/
@Input()
public disabledItems: ReadonlySet<Key> = new Set();
/**
* Adapter that manages the conversion of item types.
*/
@Input()
public itemAdapter?: Converter<T, TreeItem<T>>;
/**
* The value represents the selected values.
*/
@Input()
public value: T | null = null;
/**
* Shows full path to the selected item if set to true, else shows only the selected item.
*/
@Input()
public showSelectedPath = true;
/**
* If true, the component will be rendered in a slot-element mode.
* @ignore
*/
@Input()
public _slotElementMode?: 'ext-search-single-field';
/**
* Error message id used when `_slotElementMode` is enabled.
* @ignore
*/
@Input()
public _errorMessageId?: string;
/**
* 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);
/** Fires if the picker has focus. */
@Output()
public readonly onFocusEntered: EventEmitter<void> = new EventEmitter<void>();
/** Inform about the change of the selection state */
@Output()
public readonly valueChange: EventEmitter<T | null> =
new EventEmitter<T | null>();
/** Fires if the picker has lost focus. */
@Output()
public readonly onFocusLeft: EventEmitter<void> = new EventEmitter<void>();
/** @ignore */
@ViewChild('treePopup', { static: true })
public tree?: TreePickerPopupContentComponent<T>;
/** @ignore */
@ViewChild(LabelContainerComponent)
protected labelContainer?: LabelContainerComponent;
/** @ignore */
@ViewChild('drawerSlot')
protected drawerSlot?: ElementRef;
/** @ignore */
@ViewChild(AutoIdDirective)
protected autoId?: AutoIdDirective;
/** @ignore */
@ViewChild('comboboxElement')
protected comboboxElement?: ElementRef<HTMLSpanElement>;
/** @ignore */
@ViewChild('popup')
protected popup?: OverlayContainerComponent;
/** @ignore */
@ViewChild('itemArea')
private itemArea?: ElementRef<HTMLSpanElement>;
/** 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 */
protected internalItems: readonly (T | null)[] = this.items;
/** @ignore */
protected _drawerOpen = false;
/** @ignore */
protected readonly treePopupListId: string;
/** @ignore */
protected noValueItem: TreeItemBasicAdvancedKeys<T> = {
key: NO_VALUE_ITEM_SYMBOL,
label: '\u2013',
};
/** @ignore */
private _errorMessage = '';
/** @ignore */
private _resizeObserver?: Callback;
/** @ignore */
private hasFocus = false;
public constructor(private zone: NgZone) {
const widgetKeys = createWidgetKeySet('gc-tree-picker');
this.treePopupListId = widgetKeys.baseKey + '-popup';
}
/** @ignore */
public ngAfterViewInit(): void {
if (this.itemArea) {
this._resizeObserver = observeSize(
this.itemArea,
this.zone,
this._resizeCallback.bind(this),
);
}
this.initPopup();
}
/** @ignore */
public ngOnChanges(changes: SimpleChanges): void {
if ('readonly' in changes) {
setTimeout(() => this.initPopup());
if (this._resizeObserver) {
this._resizeObserver();
}
if (this.itemArea) {
this._resizeObserver = observeSize(
this.itemArea,
this.zone,
this._resizeCallback.bind(this),
);
}
}
if ('resetEnabled' in changes || 'items' in changes) {
this.updateInternalItems();
}
}
/** @ignore */
public ngOnDestroy(): void {
if (this._resizeObserver) {
this._resizeObserver();
}
}
/** @ignore */
protected _buttonOnKeydown(event: KeyboardEvent) {
const key = event.key;
switch (key) {
case 'ArrowDown':
if (isOnlyAltPressedOrNothing(event)) {
this._drawerOpen = true;
}
break;
case ' ':
this._drawerOpen = true;
event.preventDefault();
break;
}
}
/** @ignore */
protected _onTreeKeyboardEvent(event: KeyboardEvent): void {
const key = event.key;
if (key === 'Escape') {
this.closePopup();
} else if (key === 'Tab') {
// ensure focus move initiated via Tab starts at the component, so the "next" element is correct
this.comboboxElement?.nativeElement.focus();
this.closePopup();
// focus scope directive won't report the intermediate focus on the component, need to trigger handling manually
this.onFocusLeftHandler();
}
}
/** @ignore */
protected _computeReadonlyText(): string {
if (this.showSelectedPath) {
return this._generateLabelsOfSelectedPath().join(' \u276D ');
}
return this.tree?._getSelectedItemLabel() ?? '';
}
/** @ignore */
protected _generateLabelsOfSelectedPath(): string[] {
return this.tree ? this.tree._generateLabelsOfSelectedItemPath() : [];
}
/** @ignore */
protected _onTreeSelection(value: T | null | undefined): void {
this.value = value ?? null;
this.valueChange.emit(value);
this.closePopup();
}
/** @ignore */
protected _onButtonClick(): void {
if (this.disabled) {
return;
}
if (this._drawerOpen) {
this.closePopup();
} else {
this._drawerOpen = true;
}
}
/** @ignore */
protected _handlePopupVisible(): void {
setTimeout(() => {
this.tree?.focusChild();
});
}
/** @ignore */
protected _isButtonFocused(): boolean {
return document.activeElement == this.comboboxElement?.nativeElement;
}
/** @ignore */
protected _onLabelClick(): void {
if (!this.disabled) {
this.comboboxElement?.nativeElement.focus();
this._onButtonClick();
}
}
/** @ignore */
protected closePopup(): void {
this._drawerOpen = false;
// if the popup is closed due to a click in a random area outside (e.g. not moving to another element via 'Tab'),
// then move the focus back to the component; detectable as no specific (other) element is focused
setTimeout(() => {
if (
document.activeElement === null ||
document.activeElement === document.body
) {
this.comboboxElement?.nativeElement.focus();
} else if (
document.activeElement !== this.comboboxElement?.nativeElement
) {
this.onFocusLeftHandler();
}
});
}
/** @ignore */
protected screenReaderValueText(): string {
const value = this.tree?._getSelectedItemLabel();
if (value) {
const path = this._generateLabelsOfSelectedPath().slice(0, -1);
if (path.length > 0) {
const pathString = path.join(' \u276D ');
return `${value} (${pathString})`;
} else {
return value;
}
} else {
return '';
}
}
/** @ignore */
protected onFocusLeftHandler(): void {
if (!this._drawerOpen) {
this.onFocusLeft.emit();
this.hasFocus = false;
// 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 */
protected isBaseItem(x: unknown): x is TreeItemBasicAdvancedKeys<T> {
return isTreeItemBasic(x);
}
/** @ignore */
protected onFocusEnteredHandler(): void {
if (!this.hasFocus) {
this.hasFocus = true;
this.onFocusEntered.emit();
}
}
/** @ignore */
protected readonly internalItemAdapter = (
value: T | null,
): TreeItemBasicAdvancedKeys<T> => {
if (value === null) {
return this.noValueItem;
} else if (this.itemAdapter === undefined && this.isBaseItem(value)) {
return value;
} else if (this.itemAdapter) {
return this.itemAdapter(value);
}
console.error('Missing converter for ', value);
throw new Error('missing converter');
};
/** @ignore */
protected updateInternalItems(): void {
if (this.resetEnabled) {
this.internalItems = [null, ...this.items];
} else {
this.internalItems = this.items;
}
}
/** @ignore */
private initPopup(): void {
if (!this.readonly && this.popup) {
this.popup.anker = this.getAnker();
this.popup.scrollTargetElement = this.labelContainer?.boxEl;
}
}
private 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 */
private emitStatusChange() {
const status: FormControlStatus = {};
if (this.errorMessage) {
status.error = [this.errorMessage];
}
this.onStatusChange.emit(status);
}
/** @ignore */
private _resizeCallback(): void {
if (this._drawerOpen) {
this.closePopup();
}
}
}
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