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* Copyright bei
* Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
*
*******************************************************************************/
import {
AfterViewInit,
Component,
ContentChild,
Directive,
ElementRef,
EventEmitter,
Input,
Output,
ViewChild,
ViewContainerRef,
} from '@angular/core';
import { Converter, FocusableElementOwner, Item } from '../utils/util.types';
import { isItem, itemTrack } from '../utils/utilities';
import { TemplateDirective } from '../internal/angular-directives';
import { ButtonComponent } from '../button/button.component';
/**
* Input list component that allows adding
* one or more input fields of a desired type, rendered
* by using a passed template.
*/
@Component({
selector: 'gc-input-list',
templateUrl: './input-list.component.html',
styleUrls: ['./input-list.component.css'],
})
export class InputListComponent<T, I extends Item = Item>
implements FocusableElementOwner
{
/** @ignore */
@ViewChild('gcAddButton')
public addButton?: ButtonComponent;
/**
* Items that will render as input fields.
*/
@Input()
public items: readonly T[] = [];
/**
* Label that will show on the button that adds items.
*/
@Input()
public buttonLabel = '';
/**
* Maximum number of items that can be added.
* A zero (0) means that an endless number of items can be added.
*/
@Input()
public maxItems = 0;
/**
* Adapter that manages the conversion of item types.
*/
@Input()
public itemAdapter?: Converter<T, I>;
/**
* Fired when the add button is pressed.
*/
@Output()
public readonly onAddButtonPress: EventEmitter<void> =
new EventEmitter<void>();
/**
* Fired when the delete button is pressed.
*/
@Output()
public readonly onDeleteButtonPress: EventEmitter<T> = new EventEmitter<T>();
/**
* @ignore
*/
@ContentChild(TemplateDirective)
public inputTemplate?: TemplateDirective;
/**
* @ignore
*/
public deferredFocus?: T;
constructor(private el: ElementRef<HTMLElement>) {}
public focusChild(): boolean {
if (this.items.length > 0) {
this.focusItem(this.items[0]);
return true;
} else if (this.addButton) {
this.addButton.focusChild();
return true;
} else {
return false;
}
}
/**
* @ignore
*/
public _onAddButtonPress(): void {
this.onAddButtonPress.emit();
}
/**
* @ignore
*/
public _onDeleteButtonPress(deletedItem: T): void {
let focusTarget;
if (this.items.length > 1) {
const elements = this.el.nativeElement.querySelectorAll(
'div.gc-container [data-gc-focus-target]',
);
if (elements.length === this.items.length) {
const idx = this.items.indexOf(deletedItem);
if (idx + 1 < this.items.length) {
focusTarget = elements[idx + 1];
} else {
focusTarget = elements[idx - 1];
}
} else {
console.warn('Unable to restore focus');
}
}
if (focusTarget) {
(focusTarget as HTMLElement).focus();
} else if (this.addButton) {
this.addButton.focusChild();
} else {
// The add button might not be visible so wait a tick
setTimeout(() => {
if (this.addButton) {
this.addButton.focusChild();
}
});
}
this.onDeleteButtonPress.emit(deletedItem);
}
/**
* @ignore
*/
public getAsItem(item: T): Item {
if (this.itemAdapter === undefined) {
if (isItem(item)) {
return item;
}
throw new Error('missing converter');
} else {
return this.itemAdapter(item);
}
}
/**
* Move the input focus to the UI-Element representing the provided item
*
* @param item the item to focus
*/
public focusItem(item: T) {
const elements = this.el.nativeElement.querySelectorAll(
'div.gc-container [data-gc-focus-target]',
);
if (elements.length === this.items.length) {
const idx = this.items.indexOf(item);
const element = elements[idx];
if (idx !== -1) {
(element as HTMLElement).focus();
this.deferredFocus = undefined;
} else {
this.deferredFocus = item;
}
} else {
this.deferredFocus = item;
}
}
/**
* @ignore
*/
public _itemTrackBy = (_index: number, item: T) => {
// this makes sure we are bound to this instead of the differ
return itemTrack(this.getAsItem(item));
};
}
@Directive({
selector: '[data-gc-input-list-item]',
})
export class InputListItemDirective<T> implements AfterViewInit {
@ContentChild('vc', { read: ViewContainerRef })
public viewContainer!: ViewContainerRef;
@Input('data-gc-input-list-item')
public gcInputListItem!: T;
constructor(private list: InputListComponent<T>) {}
ngAfterViewInit(): void {
if (this.list.inputTemplate?.template) {
const template = this.list.inputTemplate.template;
setTimeout(() => {
this.viewContainer.createEmbeddedView(template, {
item: this.gcInputListItem,
});
// If there's a deferred focus item we should try to focus it
if (this.list.deferredFocus) {
const item = this.list.deferredFocus;
setTimeout(() => {
this.list.focusItem(item);
});
}
});
} else {
console.error('It is mandatory to provide a template');
}
}
}
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