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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
Component,
ElementRef,
EventEmitter,
HostBinding,
Input,
NgZone,
OnChanges,
OnDestroy,
Output,
QueryList,
SimpleChanges,
ViewChild,
ViewChildren,
} from '@angular/core';
import { observeElementSize } from '../utils/internal-utils';
import type { Callback, Item } from '../../public-api';
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',
],
})
export class SelectionFooterComponent implements OnDestroy, OnChanges {
/**
* Number of selected entries.
*/
@Input()
public selectedEntries = 0;
/**
* Event emitted when an item is selected.
*/
@Output()
public readonly onItemAction: EventEmitter<Item> = new EventEmitter<Item>();
/**
* Key of the primary action.
*/
@Input()
public primaryActionKey = '';
/**
* Event emitted when items are deselected.
*/
@Output()
public readonly onDeselectAction: EventEmitter<Item> =
new EventEmitter<Item>();
/** @ignore */
@ViewChildren('actionItem')
private renderedItems?: QueryList<ElementRef<HTMLElement>>;
/** @ignore */
@ViewChild('collapsedMenuItem')
private menuItem!: ElementRef<HTMLElement>;
/**
* Reference to the parent element, on which this component sticks or float.
*/
@Input()
public set observeForSticky(
owner: ElementRef<HTMLElement> | HTMLElement | undefined,
) {
this._observeForSticky =
owner === undefined || 'nativeElement' in owner
? owner
: new ElementRef(owner);
}
public get observeForSticky(): ElementRef<HTMLElement> | undefined {
return this._observeForSticky;
}
/**
* Actions shown in the selection footer.
*/
@Input()
public get actions(): readonly Item[] {
return this._actions;
}
public set actions(actions: readonly Item[]) {
if (this._actions.length === this.visibleActions.size) {
this.visibleActions = new Set(actions.map(i => i.key));
}
this._actions = actions;
setTimeout(() => {
this._computeVisibleItems();
});
}
/**
* Keys of all disabled actions. If `selectedEntries` is zero, all actions disabled automatically.
*/
@Input()
public get disabledActionKeys(): ReadonlySet<string> {
return this._disabledActionKeys
? this._disabledActionKeys
: new Set<string>();
}
/** @ignore */
public set disabledActionKeys(value: ReadonlySet<string> | undefined) {
this._disabledActionKeys = value ?? new Set<string>();
}
/** @ignore */
@HostBinding('class.gc-not-in-viewport')
protected get isNotInViewPort(): boolean {
return (
!this.isParentElementInViewport && this._observeForSticky !== undefined
);
}
/** @ignore */
@HostBinding('class.gc-in-viewport')
protected get isInViewPort(): boolean {
return (
this.isParentElementInViewport && this._observeForSticky !== undefined
);
}
/** @ignore */
protected visibleActions: ReadonlySet<string> = new Set();
/** @ignore */
protected notVisibleActionKeys: ReadonlySet<string> = new Set();
/** @ignore */
protected IsDeselectButtonWithText = true;
/** @ignore */
protected isDeselectButtonVisible = true;
/** @ignore */
protected deselectText = DESELECT_BUTTON_TEXT;
/** @ignore */
protected isParentElementInViewport = true;
/** @ignore */
protected actionsText = 'Aktionen';
/** @ignore */
protected menuText = 'Weitere Aktionen';
/** @ignore */
private _observeForSticky?: ElementRef<HTMLElement>;
/** @ignore */
private _actions: readonly Item[] = [];
/**
* @ignore
*/
private _resizeObserver: Callback;
/**
* @ignore
*/
private _intersectionObserver: IntersectionObserver | undefined;
/**
* @ignore
*/
private _disabledActionKeys?: ReadonlySet<string> = new Set<string>();
constructor(
private el: ElementRef<HTMLElement>,
zone: NgZone,
) {
this._resizeObserver = observeElementSize(
el.nativeElement,
zone,
this._computeVisibleItems.bind(this),
);
}
/**
* @ignore
*/
ngOnDestroy(): void {
this._resizeObserver();
this._destroyScrollingObserver();
}
/** @ignore */
ngOnChanges(changes: SimpleChanges) {
if ('observeForSticky' in changes) {
if (changes.observeForSticky.currentValue !== undefined) {
this._createScrollingObserver();
} else {
this._destroyScrollingObserver();
}
}
}
/** @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 getMenuItems(): 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 getNotVisibleMenuItems(): Item[] {
const notVisibleActions = this.actions
.filter(i => !this.isItemVisible(i))
.reverse();
this.notVisibleActionKeys = new Set(notVisibleActions.map(nva => nva.key));
return notVisibleActions;
}
/**
* @ignore
*/
private _computeVisibleItems(): void {
if (this.actions.length === 0 || this.renderedItems === undefined) {
this.visibleActions = new Set();
this.isDeselectButtonVisible = true;
this.IsDeselectButtonWithText = 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
.get(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 = visibleItems;
this._calculateDeselectVisibility(hostBounds.width);
}
/**
* @ignore
*/
private _calculateDeselectVisibility(hostBoundsWidth: number) {
if (this.actions.length > 0 && this.renderedItems !== undefined) {
if (hostBoundsWidth < 470) {
this.IsDeselectButtonWithText = false;
} else {
this.IsDeselectButtonWithText = true;
}
if (hostBoundsWidth < 340) {
this.isDeselectButtonVisible = false;
} else {
this.isDeselectButtonVisible = true;
}
}
}
/**
* @ignore
*/
private _createScrollingObserver() {
if (!this._intersectionObserver) {
const options = {
rootMargin: '0px',
threshold: 0,
};
this._intersectionObserver = new IntersectionObserver(entries => {
this.isParentElementInViewport = entries.some(
entry => entry.isIntersecting,
);
}, options);
} else {
this._intersectionObserver.disconnect();
}
if (this._observeForSticky) {
this._intersectionObserver.observe(this._observeForSticky.nativeElement);
}
}
/**
* @ignore
*/
private _destroyScrollingObserver() {
if (this._intersectionObserver) {
this._intersectionObserver.disconnect();
this._intersectionObserver = undefined;
}
}
}
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