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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
ChangeDetectionStrategy,
Component,
DestroyRef,
ElementRef,
NgZone,
computed,
effect,
inject,
input,
output,
signal,
untracked,
viewChild,
viewChildren,
} from '@angular/core';
import { observeElementSize } from '../utils/internal-utils';
import { Callback, Item } from '../utils/util.types';
import { SoundType, itemTrack, playSound } from '../utils/utilities';
import { ButtonContentDisplay } from '../button/button.component';
/**
* Types of the status which the selection footer can have.
*/
export type SelectionFooterStatus = 'success' | 'in-progress' | 'default';
const DESELECT_BUTTON_TEXT = 'Auswahl aufheben';
/**
* `gc-selection-footer` is control tool, which can be used to manage actions in tables for selected items.
*/
@Component({
selector: 'gc-selection-footer',
templateUrl: './selection-footer.component.html',
styleUrls: [
'../utils/styles/reset-list.css',
'./selection-footer.component.css',
],
host: {
'[class.gc-not-in-viewport]': 'isNotInViewPort()',
'[class.gc-in-viewport]': 'isInViewPort()',
},
changeDetection: ChangeDetectionStrategy.Default,
standalone: false,
})
export class SelectionFooterComponent {
/**
* Reference to the parent element, on which this component sticks or float.
*/
public readonly observeForSticky = input<
ElementRef<HTMLElement> | undefined,
ElementRef<HTMLElement> | HTMLElement | undefined
>(undefined, {
transform: owner =>
owner === undefined || 'nativeElement' in owner
? owner
: new ElementRef(owner),
});
/**
* Number of selected entries.
*/
public readonly selectedEntries = input(0);
/**
* Actions shown in the selection footer.
*/
public readonly actions = input<readonly Item[]>([]);
/**
* Keys of all disabled actions. If `selectedEntries` is zero, all actions disabled automatically.
*/
public readonly disabledActionKeys = input<
ReadonlySet<string>,
ReadonlySet<string> | undefined
>(new Set<string>(), {
transform: value => value ?? new Set<string>(),
});
/**
* Current status of the form.
*/
public readonly status = input<SelectionFooterStatus>('default');
/**
* Text that can be used as a descriptive message for the default status.
*/
public readonly statusTextDefault = input('');
/**
* Text that can be used as a descriptive message for the success status.
*/
public readonly statusTextSuccess = input('');
/**
* Text that can be used as a descriptive message for the in-progress status.
*/
public readonly statusTextInProgress = input('');
/**
* Key of the primary action.
*/
public readonly primaryActionKey = input('');
/**
* Event emitted when an item is selected.
*/
public readonly onItemAction = output<Item>();
/**
* Event emitted when items are deselected.
*/
public readonly onDeselectAction = output<Item | undefined>();
/** @ignore */
protected readonly statusText = computed(() => {
switch (this.status()) {
case 'in-progress':
return this.statusTextInProgress();
case 'success':
return this.statusTextSuccess();
case 'default':
return this.statusTextDefault();
}
});
/**
* ButtonContentDisplay type for the primary action button to show status icon
*/
protected readonly primaryActionButtonContentDisplay =
computed<ButtonContentDisplay>(() =>
this.status() === 'success' || this.status() === 'in-progress'
? 'status'
: 'text-only',
);
/** ignore */
protected readonly isNotInViewPort = computed<boolean>(
() =>
!this.isParentElementInViewport() &&
this.observeForSticky() !== undefined,
);
/** ignore */
protected readonly isInViewPort = computed<boolean>(
() =>
this.isParentElementInViewport() && this.observeForSticky() !== undefined,
);
/** @ignore */
protected readonly menuItems = computed<readonly Item[]>(() => {
let items: readonly Item[] = this.actions().flat().reverse();
if (!this.isDeselectButtonVisible()) {
const deselectItem: Item = {
key: this.actions().length.toString(),
label: this.deselectText,
};
items = items.concat(deselectItem);
}
return items;
});
/** @ignore */
protected readonly notVisibleMenuItems = computed<Item[]>(() => {
return this.actions()
.filter(i => !this.isItemVisible(i))
.reverse();
});
/** @ignore */
protected readonly visibleActions = signal<ReadonlySet<string>>(new Set());
/** @ignore */
protected readonly isDeselectButtonWithText = signal(true);
/** @ignore */
protected readonly isDeselectButtonVisible = signal(true);
/** @ignore */
protected readonly isParentElementInViewport = signal(true);
/** @ignore */
protected readonly notVisibleActionKeys = computed<ReadonlySet<string>>(
() => {
return new Set(this.notVisibleMenuItems().map(nva => nva.key));
},
);
/** @ignore */
protected readonly deselectText = DESELECT_BUTTON_TEXT;
/** @ignore */
protected readonly actionsText = 'Aktionen';
/** @ignore */
protected readonly menuText = 'Weitere Aktionen';
/** @ignore */
private readonly previousActionsLength = computed(
() => this.actions().length,
);
/** @ignore */
private readonly renderedItems =
viewChildren<ElementRef<HTMLElement>>('actionItem');
/** @ignore */
private readonly menuItem =
viewChild.required<ElementRef<HTMLElement>>('collapsedMenuItem');
/** @ignore */
private intersectionObserver: IntersectionObserver | undefined;
/** @ignore */
private resizeObserver: Callback;
constructor(
private el: ElementRef<HTMLElement>,
zone: NgZone,
) {
this.resizeObserver = observeElementSize(
el.nativeElement,
zone,
this.computeVisibleItems.bind(this),
);
inject(DestroyRef).onDestroy(() => {
this.resizeObserver();
this.destroyScrollingObserver();
});
effect(() => {
const currentActions = this.actions();
untracked(() => {
if (this.previousActionsLength() === this.visibleActions().size) {
this.visibleActions.set(new Set(currentActions.map(i => i.key)));
}
setTimeout(() => {
this.computeVisibleItems();
});
});
});
effect(onCleanup => {
const observeForSticky = this.observeForSticky();
if (observeForSticky !== undefined) {
this.createScrollingObserver();
onCleanup(() => {
this.destroyScrollingObserver();
});
}
});
effect(() => {
if (this.status() === 'success') {
void playSound(SoundType.SUCCESS, [
'SELECTION_FOOTER',
'STATE_SUCCESS',
'SUCCESS',
]);
}
});
}
/** @ignore */
protected onMenuAction(item: Item): void {
if (item.label === this.deselectText) {
this.onDeselectAction.emit(item);
} else {
this.onItemAction.emit(item);
}
}
/** @ignore */
protected isItemVisible(item: Item): boolean {
return this.visibleActions().has(item.key);
}
/** @ignore */
protected isLastItem(item: Item): boolean {
return this.actions()[this.actions().length - 1]?.key === item.key;
}
/** @ignore */
protected isPrimaryButton(item: Item): boolean {
return this.primaryActionKey() === item.key;
}
/** @ignore */
protected _itemTrackBy(item: Item): string {
return itemTrack(item);
}
/** @ignore */
private computeVisibleItems(): void {
if (this.actions().length === 0 || this.renderedItems().length === 0) {
this.visibleActions.set(new Set());
this.isDeselectButtonVisible.set(true);
this.isDeselectButtonWithText.set(true);
return;
}
const hostBounds = this.el.nativeElement.getBoundingClientRect();
const collapsedMenuItemWidth =
this.menuItem().nativeElement.getBoundingClientRect().width;
let availableWidth = hostBounds.width - 280;
const visibleItems: Set<string> = new Set();
for (let i = this.actions().length - 1; i >= 0 && availableWidth > 0; i--) {
const itemWidth = this.renderedItems()
.at(i)
?.nativeElement.getBoundingClientRect().width;
if (itemWidth === undefined) {
console.warn('failed to find rendered item for item index', i);
break;
}
const requiredWidth = itemWidth + (i > 0 ? collapsedMenuItemWidth : 0);
if (availableWidth >= requiredWidth) {
visibleItems.add(this.actions()[i].key);
availableWidth -= requiredWidth;
} else {
availableWidth = 0;
}
}
this.visibleActions.set(visibleItems);
this.calculateDeselectVisibility(hostBounds.width);
}
/** @ignore */
private calculateDeselectVisibility(hostBoundsWidth: number) {
if (this.actions().length > 0 && this.renderedItems().length > 0) {
this.isDeselectButtonWithText.set(hostBoundsWidth >= 470);
this.isDeselectButtonVisible.set(hostBoundsWidth >= 340);
}
}
/** @ignore */
private createScrollingObserver() {
if (!this.intersectionObserver) {
const options = {
rootMargin: '0px',
threshold: 0,
};
this.intersectionObserver = new IntersectionObserver(entries => {
this.isParentElementInViewport.set(
entries.some(entry => entry.isIntersecting),
);
}, options);
} else {
this.intersectionObserver.disconnect();
}
const observeForSticky = this.observeForSticky();
if (observeForSticky) {
this.intersectionObserver.observe(observeForSticky.nativeElement);
}
}
/** @ignore */
private destroyScrollingObserver() {
if (this.intersectionObserver) {
this.intersectionObserver.disconnect();
this.intersectionObserver = undefined;
}
}
}
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