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import { DOCUMENT, NgComponentOutlet } from '@angular/common';
import { ModalService } from '../../services/modal.service';
@Component({
selector: 'app-modal-container',
imports: [NgComponentOutlet],
templateUrl: './modal-container.html',
styleUrl: './modal-container.scss',
})
export class ModalContainer {
readonly modalService = inject(ModalService);
private readonly document = inject(DOCUMENT);
private readonly modalDialog = viewChild<ElementRef<HTMLElement>>('modalDialog');
private wasOpen = false;
private lastFocusedElement: HTMLElement | null = null;
private previousBodyOverflow: string | null = null;
private inertTargets: HTMLElement[] = [];
constructor() {
effect(() => {
const isOpen = this.modalService.isOpen();
Iif (isOpen && !this.wasOpen) {
this.wasOpen = true;
this.onModalOpened();
return;
}
Iif (!isOpen && this.wasOpen) {
this.wasOpen = false;
this.onModalClosed();
}
});
}
get componentType() {
return this.modalService.config()?.component ?? null;
}
get componentInputs() {
const config = this.modalService.config();
return config?.data ? { data: config.data } : {};
}
@HostListener('document:keydown', ['$event'])
onDocumentKeydown(event: KeyboardEvent): void {
if (!this.modalService.isOpen()) {
return;
}
if (event.key !== 'Tab') {
return;
}
this.trapTabKey(event);
}
@HostListener('document:keydown.escape')
onEscapeKey(): void {
this.modalService.onEscapeKey();
}
onBackdropClick(event: MouseEvent): void {
if ((event.target as HTMLElement).classList.contains('modal-backdrop')) {
this.modalService.onBackdropClick();
}
}
private onModalOpened(): void {
const activeElement = this.document.activeElement;
this.lastFocusedElement = activeElement instanceof HTMLElement ? activeElement : null;
this.lockBodyScroll();
this.setBackgroundInert(true);
this.focusFirstElementAfterRender();
}
private onModalClosed(): void {
this.setBackgroundInert(false);
this.unlockBodyScroll();
const elementToRestore = this.lastFocusedElement;
this.lastFocusedElement = null;
if (elementToRestore && this.document.body.contains(elementToRestore)) {
setTimeout(() => {
elementToRestore.focus({ preventScroll: true });
}, 0);
}
}
private focusFirstElementAfterRender(): void {
setTimeout(() => {
const dialog = this.modalDialog()?.nativeElement;
if (!dialog) {
return;
}
const focusable = this.getFocusableElements(dialog);
const target = focusable[0] ?? dialog;
target.focus({ preventScroll: true });
}, 0);
}
private trapTabKey(event: KeyboardEvent): void {
const dialog = this.modalDialog()?.nativeElement;
if (!dialog) {
return;
}
const focusable = this.getFocusableElements(dialog);
if (focusable.length === 0) {
event.preventDefault();
dialog.focus({ preventScroll: true });
return;
}
const first = focusable[0];
const last = focusable[focusable.length - 1];
const activeElement = this.document.activeElement;
const active = activeElement instanceof HTMLElement ? activeElement : null;
const isInside = active ? dialog.contains(active) : false;
if (event.shiftKey) {
if (!active || !isInside || active === first) {
event.preventDefault();
last.focus({ preventScroll: true });
}
return;
}
if (!active || !isInside || active === last) {
event.preventDefault();
first.focus({ preventScroll: true });
}
}
private getFocusableElements(root: HTMLElement): HTMLElement[] {
const selector = [
'a[href]',
'area[href]',
'button:not([disabled])',
'input:not([disabled])',
'select:not([disabled])',
'textarea:not([disabled])',
'iframe',
'[tabindex]:not([tabindex="-1"])',
'[contenteditable="true"]',
].join(', ');
return Array.from(root.querySelectorAll<HTMLElement>(selector)).filter((el) => {
if (el instanceof HTMLInputElement && el.type === 'hidden') {
return false;
}
return !!(el.offsetWidth || el.offsetHeight || el.getClientRects().length);
});
}
private lockBodyScroll(): void {
if (this.previousBodyOverflow !== null) {
return;
}
this.previousBodyOverflow = this.document.body.style.overflow;
this.document.body.style.overflow = 'hidden';
}
private unlockBodyScroll(): void {
if (this.previousBodyOverflow === null) {
return;
}
this.document.body.style.overflow = this.previousBodyOverflow;
this.previousBodyOverflow = null;
}
private setBackgroundInert(isInert: boolean): void {
if (isInert) {
this.inertTargets = this.getBackgroundTargets();
for (const target of this.inertTargets) {
target.setAttribute('inert', '');
target.setAttribute('aria-hidden', 'true');
}
return;
}
for (const target of this.inertTargets) {
target.removeAttribute('inert');
target.removeAttribute('aria-hidden');
}
this.inertTargets = [];
}
private getBackgroundTargets(): HTMLElement[] {
const selectors = ['main.app-content', 'app-navigation'];
const targets = new Set<HTMLElement>();
for (const selector of selectors) {
const element = this.document.querySelector(selector);
if (element instanceof HTMLElement) {
targets.add(element);
}
}
return Array.from(targets);
}
}
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