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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import { Overlay } from '@angular/cdk/overlay';
import { TemplatePortal } from '@angular/cdk/portal';
import {
Component,
ComponentRef,
computed,
Directive,
EmbeddedViewRef,
HostListener,
inject,
Injector,
input,
model,
OnInit,
signal,
TemplateRef,
ViewContainerRef
} from '@angular/core';
import { Subscription } from 'rxjs';
import { NavbarVerticalItem, NavbarVerticalItemGroup } from './si-navbar-vertical.model';
import { SI_NAVBAR_VERTICAL } from './si-navbar-vertical.provider';
/**
* Using this component, to anchor the flyout inside the navbar within the a11y tree.
* Otherwise, without aria-owns, screen reader will announce the leaving of the navbar when moving to the flyout.
* Aria-owns cannot be put directly on the trigger
* as chrome will include the flyout children in the a11y label of the trigger.
*/
@Component({
selector: 'si-navbar-flyout-anchor',
template: '',
host: { '[attr.aria-owns]': 'groupId()' }
})
class SiNavbarFlyoutAnchorComponent {
readonly groupId = input<string>();
}
@Directive({
selector: 'button[siNavbarVerticalGroupTriggerFor]',
host: {
class: 'dropdown-toggle',
'[id]': 'id',
'[class.show]': 'expanded()',
'[attr.aria-controls]': 'groupId',
'[attr.aria-expanded]': 'expanded()'
}
})
export class SiNavbarVerticalGroupTriggerDirective implements OnInit {
private static idCounter = 0;
/** @internal */
readonly groupId = `si-navbar-vertical-group-${SiNavbarVerticalGroupTriggerDirective.idCounter++}`;
readonly id = `${this.groupId}-trigger`;
readonly groupTemplate = input.required<TemplateRef<unknown>>({
alias: 'siNavbarVerticalGroupTriggerFor'
});
readonly groupData = input<{ item?: NavbarVerticalItem; group: NavbarVerticalItemGroup }>();
readonly stateId = input<string>();
readonly expanded = model.required<boolean>();
/** @internal */
readonly flyout = signal(false);
/** @internal */
readonly active = signal(false);
protected readonly navbar = inject(SI_NAVBAR_VERTICAL);
private flyoutOutsideClickSubscription?: Subscription;
private readonly viewContainer = inject(ViewContainerRef);
private readonly overlay = inject(Overlay);
private readonly injector = Injector.create({ parent: inject(Injector), providers: [] });
private readonly overlayRef = this.overlay.create({
positionStrategy: this.overlay
.position()
.flexibleConnectedTo(this.viewContainer.element)
.withPositions([
{ originX: 'end', originY: 'top', overlayX: 'start', overlayY: 'top' },
{ originX: 'end', originY: 'bottom', overlayX: 'start', overlayY: 'bottom' }
])
});
private groupView!: EmbeddedViewRef<unknown>;
private flyoutAnchorComponentRef?: ComponentRef<SiNavbarFlyoutAnchorComponent>;
private readonly templatePortal = computed(
() =>
new TemplatePortal(this.groupTemplate(), this.viewContainer, this.groupData(), this.injector)
);
ngOnInit(): void {
this.attachInline();
}
/** @internal */
hideFlyout(): void {
if (this.flyout()) {
this.flyout.set(false);
this.flyoutAnchorComponentRef?.destroy();
this.flyoutAnchorComponentRef = undefined;
this.attachInline();
this.flyoutOutsideClickSubscription?.unsubscribe();
}
}
@HostListener('click') protected triggered(): void {
if (this.navbar.collapsed()) {
this.toggleFlyout();
} else {
this.expanded.set(!this.expanded());
this.navbar.groupTriggered();
}
}
private toggleFlyout(): void {
Iif (this.flyout()) {
this.hideFlyout();
} else {
this.flyout.set(true);
this.attachFlyout();
}
}
private attachInline(): void {
this.overlayRef.detach();
this.groupView?.destroy(); // we need ?. for first attachment
this.groupView = this.viewContainer.createEmbeddedView(this.groupTemplate(), this.groupData(), {
injector: this.injector
});
}
private attachFlyout(): void {
this.groupView.destroy();
this.groupView = this.overlayRef.attach(this.templatePortal());
this.flyoutAnchorComponentRef = this.viewContainer.createComponent(
SiNavbarFlyoutAnchorComponent
);
this.flyoutAnchorComponentRef.setInput('groupId', this.groupId);
this.flyoutOutsideClickSubscription = this.overlayRef
.outsidePointerEvents()
.subscribe(() => this.hideFlyout());
}
}
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