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AfterViewInit,
Component,
ComponentRef,
ElementRef,
EventEmitter,
HostBinding,
Input,
Output,
ViewChild,
ViewContainerRef,
ViewEncapsulation,
} from '@angular/core';
import { getKeyboardFocusableElements } from '../../../utils/internal-utils';
import { ModalConfig } from '../modal-overlay-container.service';
export class DialogOverlayRef {
public readonly onClosed: EventEmitter<void> = new EventEmitter<void>();
private focusNode?: HTMLElement;
private _disabledElements: Map<Element, string | null> = new Map<
Element,
string | null
>();
constructor() {
if (
document.activeElement !== null &&
document.activeElement instanceof HTMLElement
) {
this.focusNode = document.activeElement;
}
getKeyboardFocusableElements(document.body).forEach(el => {
this._disabledElements.set(el, el.getAttribute('tabindex'));
el.setAttribute('tabindex', '-1');
});
}
public close(): void {
this.resetTabIndex();
this.onClosed.next();
setTimeout(() => {
this.focusNode?.focus();
});
}
private resetTabIndex() {
this._disabledElements.forEach((v, k) => {
if (v === null) {
k.removeAttribute('tabindex');
} else {
k.setAttribute('tabindex', v);
}
});
}
}
@Component({
selector: 'gc-dialog-modal-overlay-container',
template: ` <dialog
#dialog
[attr.aria-label]="labelledby ? null : label"
[attr.aria-labelledby]="labelledby"
[attr.aria-describedby]="describedby"
[attr.role]="_role"
class="gc-dialog-modal-overlay-container"
(close)="handleDialogClose()"
(click)="handleDialogClick($event)"
(focus)="handleDialogFocus($event)"
>
<ng-container #container />
</dialog>`,
styleUrls: ['./dialog-modal-overlay-container.css'],
// eslint-disable-next-line @angular-eslint/use-component-view-encapsulation
encapsulation: ViewEncapsulation.None,
})
export class DialogModalOverlayContainerComponent implements AfterViewInit {
@HostBinding('class.gc-modal-error')
public _errorType = false;
@HostBinding('class.gc-modal-inactive')
public _inactive = false;
@Input()
public label?: string;
@Input()
public describedby: string | null = null;
@Input()
public labelledby: string | null = null;
@Output()
public readonly onClose: EventEmitter<void> = new EventEmitter<void>();
@ViewChild('container', { read: ViewContainerRef })
private container?: ViewContainerRef;
@ViewChild('dialog')
private dialog?: ElementRef<HTMLDialogElement>;
@Input()
public get component(): ComponentRef<unknown> | undefined {
return this._component;
}
public set component(c: ComponentRef<unknown>) {
this.container?.clear();
this._component = c;
setTimeout(() => {
this.container?.insert(c.hostView);
});
}
protected _role: 'alertdialog' | null = null;
private _component?: ComponentRef<unknown>;
private lastFocusedElement?: HTMLElement;
private focusNode?: HTMLElement;
constructor(config: ModalConfig) {
this._errorType = config.type === 'error';
this._role = config.variant === 'alertdialog' ? 'alertdialog' : null;
this.focusNode = document.activeElement as HTMLElement;
}
ngAfterViewInit(): void {
if (this.dialog) {
this.dialog.nativeElement.showModal();
}
}
protected handleDialogClose(): void {
this.onClose.emit();
this.focusNode?.focus();
}
// workaround for inconsistent browser focus event behavior (HTMLDialogElement receives focus on Chromium but not on FF)
protected handleDialogFocus(event: FocusEvent) {
if (!this.dialog) {
return;
}
if (this.lastFocusedElement) {
if (event.target === this.dialog.nativeElement) {
event.preventDefault();
}
this.lastFocusedElement.focus();
}
}
// workaround for inconsistent browser focus event behavior (HTMLDialogElement receives focus on Chromium but not on FF)
protected handleDialogClick(e: MouseEvent): void {
if (!this.dialog) {
return;
}
const target = e.target;
const focusableElements = getKeyboardFocusableElements(
this.dialog.nativeElement,
);
if (
target &&
target instanceof HTMLElement &&
target !== this.dialog.nativeElement &&
focusableElements.includes(target)
) {
this.lastFocusedElement = target;
}
const focusListenerCallback = () => {
this.lastFocusedElement?.removeEventListener(
'focus',
focusListenerCallback,
);
this.lastFocusedElement = undefined;
};
this.lastFocusedElement?.addEventListener('focus', focusListenerCallback);
}
}
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