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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
AfterViewInit,
ChangeDetectorRef,
Directive,
ElementRef,
Input,
QueryList,
ViewChild,
} from '@angular/core';
import { AriaLiveReaderComponent } from '../../internal/aria-live-reader/aria-live-reader.component';
import { FocusScopeDirective } from '../../internal/focus-scope.directive';
import { AutoIdDirective } from '../../internal/label-container/label-container.component';
import {
OverlayContainerComponent,
OverlayLocation,
} from '../../internal/overlay-container/overlay-container.component';
interface AutoCompleteResultComplex {
readonly entries: readonly string[];
readonly additionalEntriesCount: number;
}
export type AutoCompleteResult = readonly string[] | AutoCompleteResultComplex;
function isComplexResult(
value: AutoCompleteResult,
): value is AutoCompleteResultComplex {
return !Array.isArray(value);
}
/**
* Internal base directive to implement AutoComplete for text input components
*/
@Directive()
export abstract class AutoCompleteDirective implements AfterViewInit {
/**
* Optional function to compute a list of auto-complete entries
*/
@Input()
public autoComplete?: (text: string) => Promise<AutoCompleteResult>;
/**
* Timeout (in milliseconds) to wait until auto-complete is triggered.
*
* Default 400ms
*/
@Input()
public autoCompleteTriggerTimeout = 400;
@ViewChild('ariaLiveRegion')
private ariaLiveRegion?: AriaLiveReaderComponent;
/** @ignore */
protected _popup_overlayLocation: OverlayLocation = 'end-bottom';
/** @ignore */
protected _impl_loading = false;
/** @ignore */
protected _impl_drawerOpen = false;
/** @ignore */
protected _impl_id?: string;
/** @ignore */
protected _impl_input_id?: string;
/** @ignore */
protected _impl_listbox_id?: string;
/** @ignore */
protected _popup_items: readonly string[] = [];
/** @ignore */
protected _popup_extra_item?: string;
/** @ignore */
protected _popup_focused?: string;
/** @ignore */
private _lastLoadId = 0;
/** @ignore */
private _debounceTimeout?: ReturnType<typeof setTimeout>;
/** @ignore */
protected abstract focusScope?: FocusScopeDirective;
/** @ignore */
protected abstract autoId?: AutoIdDirective;
/** @ignore */
protected abstract popup?: OverlayContainerComponent;
/** @ignore */
protected abstract autocompleteItems?: QueryList<ElementRef<HTMLElement>>;
/** @ignore */
protected abstract get popupAnker(): undefined | ElementRef<HTMLElement>;
/** @ignore */
protected abstract get popupScrollTarget():
| undefined
| ElementRef<HTMLElement>;
constructor(
private readonly change: ChangeDetectorRef,
private readonly showEmptyResult = false,
) {}
/** @ignore */
public ngAfterViewInit(): void {
if (this.autoId === undefined) {
throw new Error(
'missing autoId directive, must be set by the extending class',
);
}
this._impl_id = this.autoId.autoId;
this._impl_listbox_id = this._impl_id + '_listbox';
this._impl_input_id = this.autoId.inputId;
if (this.popup && this.popupAnker) {
this.popup.anker = this.popupAnker;
if (this.popupScrollTarget) {
this.popup.scrollTargetElement = this.popupScrollTarget;
}
}
this.change.detectChanges();
}
/** @ignore */
protected async _autoCompleteOnInput(inputText: string) {
if (this.autoComplete) {
await this.debounce(this.autoCompleteTriggerTimeout);
if (this.isFocusWithin()) {
await this._loadAutoCompleteItems(inputText);
if (
(this._popup_items.length > 0 || this._popup_extra_item) &&
this.isFocusWithin()
) {
this._showCompletions();
} else {
this._impl_drawerOpen = false;
}
} else {
this._impl_drawerOpen = false;
}
}
}
/** @ignore */
protected async _loadAutoCompleteItems(text: string) {
if (this.autoComplete === undefined) {
this._popup_items = [];
} else {
const loadId = ++this._lastLoadId;
const autoCompleteResults =
await this.loadItemsWithLoadingIndicator(text);
const items = isComplexResult(autoCompleteResults)
? autoCompleteResults.entries
: autoCompleteResults;
const additionalEntryCount = isComplexResult(autoCompleteResults)
? autoCompleteResults.additionalEntriesCount
: undefined;
if (loadId === this._lastLoadId) {
this._popup_items = items;
if (items.length === 0 && this.showEmptyResult) {
this._popup_extra_item = `Keine Treffer für „${text}” gefunden`;
this.readAriaLive(`Keine Treffer für „${text}” gefunden`);
} else if (
additionalEntryCount !== undefined &&
additionalEntryCount > 0
) {
this._popup_extra_item = `und ${additionalEntryCount.toFixed(0)} weitere Treffer – bitte geben Sie mehr Zeichen ein`;
this.readAriaLive(
`Mehr als ${items.length.toFixed(0)} Treffer gefunden`,
);
} else {
this._popup_extra_item = undefined;
this.readAriaLive(`${items.length.toFixed(0)} Vorschläge vorhanden`);
}
}
}
}
/**
* @ignore
*/
protected isFocusWithin(): boolean {
if (this.focusScope !== undefined) {
return this.focusScope.focusWithin;
}
return false;
}
/** @ignore */
protected _showCompletions() {
this._popup_focused = undefined;
this._impl_drawerOpen = true;
}
/** @ignore */
protected _hideCompletions(skipFocus?: boolean) {
this._impl_drawerOpen = false;
this._popup_focused = undefined;
// 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
if (!skipFocus) {
setTimeout(() => {
if (
document.activeElement === null ||
document.activeElement === document.body
) {
this.focusInputField();
}
});
}
}
/** @ignore */
protected debounce(ms: number) {
return new Promise<void>(resolve => {
if (this._debounceTimeout) {
clearTimeout(this._debounceTimeout);
}
this._debounceTimeout = setTimeout(() => {
resolve();
}, ms);
});
}
/** @ignore */
protected _popup_getItemId(item: string) {
if (item === this._popup_extra_item) {
return this._popup_getExtraItemId();
}
const id = this._impl_id?.toString();
return (id ?? '') + '_ac-' + this._popup_items.indexOf(item).toString();
}
/** @ignore */
protected _popup_getExtraItemId() {
const id = this._impl_id?.toString();
return (id ?? '') + '_ac-extra_item';
}
/** @ignore */
protected _popup_handleVisible() {
// empty
}
/** @ignore */
protected _popup_handleHide() {
// empty
}
/** @ignore */
protected _popup_handleLocationChange(location: OverlayLocation) {
this._popup_overlayLocation = location;
}
/** @ignore */
protected _popup_onMouseDown(event: MouseEvent) {
event.preventDefault();
}
/** @ignore */
protected async _popup_onClick(item: string) {
if (this._popup_extra_item === item) {
this._popup_focused = this._popup_extra_item;
} else {
this._handleAutoCompleteSelection(item);
this._hideCompletions(false);
await this._handleChange();
}
}
/** @ignore */
protected _popup_focusNext() {
if (this._popup_focused === undefined) {
this._popup_focused = this._popup_items[0];
} else {
const idx = this._popup_items.indexOf(this._popup_focused);
if (idx >= 0 && this._popup_items.length > idx + 1) {
this._popup_focused = this._popup_items[idx + 1];
} else if (
this._popup_extra_item &&
idx + 1 === this._popup_items.length
) {
this._popup_focused = this._popup_extra_item;
}
}
this.scrollToFocusedItem();
}
/** @ignore */
protected _popup_focusPrev() {
if (this._popup_focused === undefined) {
if (this._popup_extra_item) {
this._popup_focused = this._popup_extra_item;
} else {
this._popup_focused = this._popup_items[this._popup_items.length - 1];
}
} else {
const idx = this._popup_items.indexOf(this._popup_focused);
if (0 <= idx - 1) {
this._popup_focused = this._popup_items[idx - 1];
} else if (
this._popup_extra_item &&
this._popup_focused === this._popup_extra_item
) {
this._popup_focused = this._popup_items[this._popup_items.length - 1];
}
}
this.scrollToFocusedItem();
}
/** @ignore */
protected _popup_focusFirst() {
this._popup_focused = this._popup_items[0];
this.scrollToFocusedItem();
}
/** @ignore */
protected _popup_focusLast() {
this._popup_focused =
this._popup_extra_item ?? this._popup_items[this._popup_items.length - 1];
this.scrollToFocusedItem();
}
/** @ignore */
protected async _popup_applyFocused() {
if (this._popup_focused && this._popup_focused !== this._popup_extra_item) {
this._handleAutoCompleteSelection(this._popup_focused);
this._hideCompletions(false);
await this._handleChange();
}
}
/** @ignore */
private readAriaLive(text: string) {
if (this.ariaLiveRegion) {
this.ariaLiveRegion.readText(text);
}
}
/** @ignore */
private async loadItemsWithLoadingIndicator(
value: string,
): Promise<AutoCompleteResult> {
const loadingTimeout = window.setTimeout(() => {
this._impl_loading = true;
this._impl_drawerOpen = true;
this.readAriaLive('Ergebnisse werden geladen');
}, 200);
const result: AutoCompleteResult = this.autoComplete
? await this.autoComplete(value)
: [];
window.clearTimeout(loadingTimeout);
this._impl_loading = false;
this._impl_drawerOpen = false;
return result;
}
/**
* @ignore
*/
private scrollToFocusedItem(): void {
if (this.autocompleteItems) {
const searchItems = this._popup_extra_item
? [...this._popup_items, this._popup_extra_item]
: this._popup_items;
const focusedItemIdx = searchItems.findIndex(
i => i === this._popup_focused,
);
this.autocompleteItems
.get(focusedItemIdx)
?.nativeElement.scrollIntoView({ block: 'nearest', inline: 'nearest' });
}
}
/** @ignore */
protected abstract focusInputField(): void;
/**
* @ignore
* Is used to update only the input value
*/
protected abstract _handleAutoCompleteSelection(text: string): void;
/**
* @ignore
* Is used to manually trigger the `change` event handling of the input element
*/
protected abstract _handleChange(): Promise<void>;
}
|