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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
Component,
ElementRef,
EventEmitter,
Input,
NgZone,
OnChanges,
OnDestroy,
Output,
QueryList,
TemplateRef,
ViewChild,
ViewChildren,
} from '@angular/core';
import { observeElementSize } from '../utils/internal-utils';
import {
Callback,
FilterAction,
FilterItem,
FilterSlots,
FocusableElementOwner,
HasSublabel,
Item,
ItemGroup,
SlotItem,
} from '../utils/util.types';
import { itemTrack } from '../utils/utilities';
import { ButtonComponent } from '../button/button.component';
import { FilterButtonComponent } from './filter-button/filter-button.component';
import { FilterContainerComponent } from './filter-container/filter-container.component';
/**
* Filter component that can be used to reduce the content of the page by applying various filters.
*/
@Component({
selector: 'gc-filter',
templateUrl: './filter.component.html',
styleUrls: [
'../utils/styles/reset-form.css',
'../utils/styles/reset-list.css',
'./filter.component.css',
],
standalone: false,
})
export class FilterComponent
implements OnDestroy, FocusableElementOwner, OnChanges
{
/**
* Items that will show as filters.
*/
@Input()
public items: readonly FilterItem[] = [];
/**
* Content of the filter.
*/
@Input()
public filterContent?: TemplateRef<unknown>;
/**
* Key of the primary action shown in the filter container.
*/
@Input()
public primaryFooterActionKey = '';
/**
* Decides if the passed error items will be shown. true === shown
*/
@Input()
public showErrors = false;
/**
* Handler customize the initial focused element in the content area.
* Should return `true` if the content was focused, `false` if the focus
* request could not be handled.
*/
@Input()
public focusContentChild?: () => boolean;
/**
* Fires upon a filter action press and emits an action.
*/
@Output()
public readonly onAction: EventEmitter<FilterAction> =
new EventEmitter<FilterAction>();
/**
* Fires upon an error item press and emits the error item.
*/
@Output()
public readonly onErrorItemAction: EventEmitter<Item> =
new EventEmitter<Item>();
/**
* Fires upon a change of the overlay visibility.
* @deprecated visibility is implied by the selectedFilterItem, event will never be fired
*/
@Output()
public readonly overlayVisibleChange: EventEmitter<boolean> =
new EventEmitter<boolean>();
/**
* Fires upon adding a filter to the added filter items that are shown in non-responsive-mode
*/
@Output()
public readonly onAdd: EventEmitter<FilterItem> =
new EventEmitter<FilterItem>();
/**
* Fires upon removing an item from the added filter items.
*/
@Output()
public readonly onRemove: EventEmitter<FilterItem> =
new EventEmitter<FilterItem>();
/**
* Fires upon the change of the currently selected filter item.
*/
@Output()
public readonly selectedFilterItemChange: EventEmitter<
FilterItem | undefined
> = new EventEmitter<FilterItem | undefined>();
/**
* @ignore
*/
@ViewChild('addButton', { read: ButtonComponent })
private addButtonComponent!: ButtonComponent;
/**
* @ignore
*/
@ViewChild('condensedFiltersButton', { read: FilterButtonComponent })
private condensedFiltersButton!: FilterButtonComponent;
/**
* @ignore
*/
@ViewChildren('filterButton')
private filterButtons?: QueryList<FilterButtonComponent>;
/** @ignore */
@ViewChildren('filterButtonListItem')
private filterButtonElements?: QueryList<ElementRef<HTMLElement>>;
/** @ignore */
@ViewChild('filterContainerComponent')
private filterContainerComponent?: FilterContainerComponent;
/**
* Currently selected item.
*/
@Input()
public get selectedFilterItem(): FilterItem | undefined {
return this._selectedFilterItem;
}
public set selectedFilterItem(item: FilterItem | undefined) {
if (this._selectedFilterItem === item) {
return;
}
// close an already open container, also includes closure when the selection is cleared
this._closeContainer(false);
this._selectedFilterItem = item;
if (item) {
// determine the anchor for the item and open the container
// if the list of filters is updated in the same tick as the selected filter, the anchor/button may not yet be available in the DOM, need to wait a tick
setTimeout(() => {
const anchor = this.getFilterContainerAnchor(item);
if (anchor === undefined) {
throw new Error(
`failed to find filter button for item with key '${item.key}', check that the filter is added`,
);
} else {
anchor.nativeElement.focus(); //Focus the filter-pill to make sure the pill gets the focus back after closing the container
this.openFilterContainer(anchor);
}
});
}
}
/**
* input has no effect, previously toggled the filter container overlay
* @deprecated input has no effect, control filter container visibility via `selectedFilterItem`
*/
@Input()
public set overlayVisible(_value: boolean) {
console.warn(
'usage of overlayVisible is deprectated and has no effect, use selectedFilterItem instead',
);
}
/**
* @ignore
*/
get filterButtonsCanFit(): boolean {
return this._filterButtonsCanFit;
}
/**
* @ignore
*/
set filterButtonsCanFit(value: boolean) {
const previousValue = this._filterButtonsCanFit;
this._filterButtonsCanFit = value;
if (value !== previousValue && this.selectedFilterItem !== undefined) {
this.overlayContainerAnker = this.getFilterContainerAnchor(
this.selectedFilterItem,
);
}
if (value !== previousValue) {
const wasCollapsedAndCondensedButtonFocused =
!previousValue &&
document.activeElement ===
this.condensedFiltersButton.button.nativeElement;
const wasExpandedAndFilterButtonFocused =
previousValue &&
this.filterButtons?.find(
fb => document.activeElement === fb.button.nativeElement,
) !== undefined;
if (
wasCollapsedAndCondensedButtonFocused ||
wasExpandedAndFilterButtonFocused
) {
setTimeout(() => this.focusChild());
}
}
}
/**
* @ignore
*/
public menuFilterButtonVisible = false;
/**
* @ignore
*/
public _filterContainerIsFullScreen = false;
/** @ignore */
public _filterContainerVisible = false;
/** @ignore */
protected overlayContainerAnker?: ElementRef<HTMLElement>;
/**
* @ignore
*/
private _filterButtonsCanFit = false;
/** @ignore */
private _selectedFilterItem?: FilterItem;
/**
* @ignore
*/
private resizeObserver: Callback;
constructor(
zone: NgZone,
private el: ElementRef<HTMLElement>,
) {
this.resizeObserver = observeElementSize(
el.nativeElement,
zone,
this.toggleFilterButtonsVisibility.bind(this),
);
}
/**
* Try to move the focus to the error section of the currently open filter-popup
*
* @returns `true` if focus got transfered successfully
*/
public moveFocusToError(): boolean {
if (this.filterContainerComponent) {
return this.filterContainerComponent.moveFocusToError();
}
return false;
}
/**
* @ignore
*/
ngOnDestroy(): void {
this.resizeObserver();
}
/**
* @ignore
*/
ngOnChanges(): void {
this.toggleFilterButtonsVisibility();
}
/**
* @ignore
*/
public _onAddButtonMenuAction(item: FilterItem): void {
this.onAdd.emit(item);
}
/**
* @ignore
*/
public _onRemoveFilterButton(item: FilterItem): void {
this.onRemove.emit(item);
}
/**
* @ignore
*/
public _onButtonAction(
item: FilterItem,
button: ElementRef<HTMLElement>,
): void {
if (item.key === this.selectedFilterItem?.key) {
this._closeContainer(true);
} else {
this._selectedFilterItem = item;
this.selectedFilterItemChange.emit(item);
this.openFilterContainer(button);
}
}
/**
* @ignore
*/
public _onResponsiveButtonAction(
item: FilterItem,
button: ElementRef<HTMLElement>,
): void {
if (!item.added) {
this.onAdd.emit(item);
}
this._onButtonAction(item, button);
}
/**
* @ignore
*/
public _filterSlot(
items: readonly SlotItem<FilterSlots>[],
slot: FilterSlots,
): readonly SlotItem<FilterSlots>[] {
return items.filter(item => item.slot === slot);
}
/**
* @ignore
*/
public _onAction(action: SlotItem<FilterSlots>, item: FilterItem): void {
this.onAction.emit({ item, action });
}
/**
* @ignore
*/
public responsiveFilterItems(): ItemGroup<FilterItem & HasSublabel>[] {
const sortedItems = [...this.items].sort((a, b) =>
a.label.localeCompare(b.label),
);
return sortedItems.reduce<ItemGroup<FilterItem & HasSublabel>[]>(
(group, entry) => {
const active = entry.added === true && entry.value.length > 0;
return [
{
...group[0],
items: active
? group[0].items.concat({
...entry,
sublabel: this._convertItemValuesToText(entry.value, 42),
})
: group[0].items,
},
{
...group[1],
items: !active
? group[1].items.concat({ ...entry, sublabel: '\u2013' })
: group[1].items,
},
];
},
[
{ key: 'active-filter', label: 'Aktive Filter', items: [] },
{ key: 'inactive-filter', label: 'Weitere Filter', items: [] },
],
);
}
/**
* @ignore
*/
public _convertItemValuesToText(value: string[], maxLength?: number): string {
if (value.length > 0) {
const joinedValue = value.join('; ');
if (maxLength === undefined || joinedValue.length < maxLength) {
return joinedValue;
} else if (value.length > 1) {
return value.length.toString() + ' ausgewählt';
} else {
return joinedValue;
}
} else {
return '\u2013';
}
}
/**
* @ignore
*/
public _closeContainer(clearSelectedItem: boolean): void {
if (clearSelectedItem) {
this.selectedFilterItem = undefined;
this.selectedFilterItemChange.emit(undefined);
}
this._filterContainerVisible = false;
// closing the container closes the modalOverlayRef that tries to return the focus to the last element,
// when the responsive/condensed filter pill is shown however this won't work as the
// focus was within the associated menu -> set focus on the indended element here
if (!this.filterButtonsCanFit) {
this.condensedFiltersButton.focusChild();
}
}
/**
* @ignore
*/
public focusChild(): boolean {
if (this.getAddedItems().length === 0) {
return this.addButtonComponent.focusChild();
} else if (!this.filterButtonsCanFit) {
return this.condensedFiltersButton.focusChild();
} else {
const firstFilterButton = this.filterButtons?.get(0);
if (firstFilterButton) {
return firstFilterButton.focusChild();
} else {
return false;
}
}
}
/**
* Move the focus to the item
* @returns `true` if the focus could be moved, otherwise false
*/
public focusItem(item: FilterItem): boolean {
const button = this.filterButtons?.find(b => b.itemKey === item.key);
if (button) {
return button.focusChild();
}
return false;
}
/** @ignore */
protected abbreviate(item: FilterItem): boolean {
return item.allowAbbreviation === true && item.value.length === 1;
}
protected responsiveFilterButtonLabel(): string {
const count = this.getAddedItems().filter(
item => item.value.length > 0 && item.added === true,
).length;
if (count < 1) {
return 'Filter';
} else if (count === 1) {
return '1 aktiver Filter';
} else {
return count.toString() + ' aktive Filter';
}
}
protected getAddedItems(): FilterItem[] {
return this.items.filter(item => item.added === true);
}
protected getHiddenItems(): FilterItem[] {
return this.items.filter(item => !item.added);
}
/** @ignore */
protected _itemTrackBy(item: Item): string {
return itemTrack(item);
}
/** @ignore */
private getFilterContainerAnchor(
item: FilterItem,
): ElementRef<HTMLElement> | undefined {
if (this.filterButtonsCanFit) {
return this.filterButtons?.find(
filterButton => filterButton.itemKey === item.key,
)?.button;
} else {
return this.condensedFiltersButton.button;
}
}
/** @ignore */
private openFilterContainer(anchor: ElementRef<HTMLElement>) {
this.overlayContainerAnker = anchor;
this._filterContainerVisible = true;
}
/**
* @ignore
*/
private toggleFilterButtonsVisibility(): void {
setTimeout(() => {
const gap = 12;
const filterButtonsWidth =
this.filterButtonElements !== undefined &&
this.filterButtonElements.length > 0
? this.filterButtonElements.reduce(
(width, el) =>
width + el.nativeElement.getBoundingClientRect().width,
0,
) +
(this.filterButtonElements.length - 1) * gap
: 0;
// 32 === width of filter icon (incl. padding); 40 === add button width (40)
const filterButtonsContainerWidth =
32 +
gap +
filterButtonsWidth +
(this.getHiddenItems().length > 0 ? gap + 40 : 0);
if (filterButtonsContainerWidth > this.el.nativeElement.clientWidth) {
this.filterButtonsCanFit = false;
} else {
this.filterButtonsCanFit = true;
}
});
}
}
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