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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import { Overlay, OverlayRef } from '@angular/cdk/overlay';
import { TemplatePortal } from '@angular/cdk/portal';
import {
Component,
ComponentRef,
Directive,
ElementRef,
EmbeddedViewRef,
HostBinding,
HostListener,
inject,
Injector,
input,
OnChanges,
OnDestroy,
OnInit,
output,
TemplateRef,
ViewContainerRef
} from '@angular/core';
import { of, Subject } from 'rxjs';
import { filter, skip, take, takeUntil } from 'rxjs/operators';
import { SI_HEADER_WITH_DROPDOWNS } from './si-header.model';
@Component({ template: '', host: { '[attr.aria-owns]': 'ariaOwns()' } })
class SiHeaderAnchorComponent {
readonly ariaOwns = input<string>();
}
/**
* Trigger to open dropdowns in a navbar.
* A dropdown will always be attached to the view, even if not visible.
*
* If a dropdown is opened in desktop mode, it will be reattached to an overlay while being opened.
*/
@Directive({
selector: '[siHeaderDropdownTriggerFor]',
host: {
class: 'dropdown-toggle'
},
exportAs: 'siHeaderDropdownTrigger'
})
export class SiHeaderDropdownTriggerDirective implements OnChanges, OnInit, OnDestroy {
private static idCounter = 0;
/** Template that be rendered inside the dropdown. */
readonly dropdown = input.required<TemplateRef<unknown>>({ alias: 'siHeaderDropdownTriggerFor' });
/** Data that should be passed as template context to the dropdown. */
readonly dropdownData = input<unknown>();
/** Emits whenever a dropdown is opened or closed. */
readonly openChange = output<boolean>();
private readonly dropdownClose = new Subject<void>();
/** Child triggers will set themselves here if they are open. */
private openSubmenu?: SiHeaderDropdownTriggerDirective;
private readonly viewContainerRef = inject(ViewContainerRef);
private readonly elementRef = inject<ElementRef<HTMLElement>>(ElementRef);
private readonly overlay = inject(Overlay);
private readonly parent = inject(SiHeaderDropdownTriggerDirective, {
optional: true,
skipSelf: true
});
/** @internal */
readonly navbar = inject(SI_HEADER_WITH_DROPDOWNS, { optional: true });
// we need to create a new injector, so that the parent can be injected properly
private readonly injector = Injector.create({ parent: inject(Injector), providers: [] });
private viewRef?: EmbeddedViewRef<unknown>;
private portal?: TemplatePortal<unknown>;
private overlayRef?: OverlayRef;
/** @internal */
readonly level: number = this.parent ? this.parent.level + 1 : 1;
// used to prevent immediate re-creation of the overlay if this trigger was clicked while overlay is open
private destroying = false;
/** @internal */
@HostBinding('id') readonly id =
`si-navbar-dropdown-trigger-${SiHeaderDropdownTriggerDirective.idCounter++}`;
// eslint-disable-next-line @typescript-eslint/naming-convention
@HostBinding('class.show') @HostBinding('attr.aria-expanded') protected _isOpen = false;
/** @internal */
@HostBinding('attr.aria-controls') readonly ariaControls =
`si-navbar-dropdown-${SiHeaderDropdownTriggerDirective.idCounter}`;
private headerAnchorComponentRef?: ComponentRef<SiHeaderAnchorComponent>;
/** Whether the dropdown is open. */
get isOpen(): boolean {
return this._isOpen;
}
/** @internal */
get isOverlay(): boolean {
return !!this.overlayRef;
}
ngOnChanges(): void {
Iif (this.portal) {
this.portal.templateRef = this.dropdown();
this.portal.context = this.dropdownData();
}
}
ngOnInit(): void {
// Always attach the dropdown, so that it can be used with routerLinkActive
this.attachDropdownInline();
}
ngOnDestroy(): void {
this.close();
this.dropdownClose.complete();
}
/** Opens the dropdown. */
open(): void {
if (this.destroying || this._isOpen) {
return;
}
(this.navbar?.inlineDropdown ?? of(false)).pipe(take(1)).subscribe(inline => {
this._isOpen = true;
if (!inline) {
this.attachDropdownOverlay();
}
this.navbar?.inlineDropdown
?.pipe(skip(1), takeUntil(this.dropdownClose))
.subscribe(() => this.close());
});
if (this.parent) {
this.parent.openSubmenu = this;
}
if (this.navbar?.dropdownOpened) {
this.navbar?.dropdownOpened(this);
}
this.openChange.emit(true);
}
/** Closes the dropdown. */
close(options?: { all?: boolean }): void {
if (!this._isOpen) {
return;
}
if (this.openSubmenu) {
this.openSubmenu.close();
}
this.dropdownClose.next();
this._isOpen = false;
if (this.overlayRef) {
this.destroying = true;
this.overlayRef.detach();
this.overlayRef.dispose();
this.viewRef?.destroy();
this.portal = undefined;
this.overlayRef = undefined;
this.headerAnchorComponentRef?.destroy();
// do not use queueMicrotask, it executed to early
setTimeout(() => (this.destroying = false));
this.attachDropdownInline();
} else {
this.viewRef?.markForCheck();
}
if (this.parent) {
this.parent.openSubmenu = undefined;
}
if (options?.all && this.parent) {
this.parent.close(options);
} else {
if (this.navbar?.dropdownClosed) {
this.navbar?.dropdownClosed(this);
}
this.openChange.emit(false);
}
}
@HostListener('click')
protected click(): void {
if (this._isOpen) {
this.close();
} else {
this.open();
}
}
private attachDropdownInline(): void {
this.viewRef = this.viewContainerRef.createEmbeddedView(this.dropdown(), this.dropdownData(), {
injector: this.injector
});
this.viewRef.markForCheck();
}
private attachDropdownOverlay(): void {
this.viewRef?.destroy();
this.overlayRef = this.overlay.create({
positionStrategy: this.overlay
.position()
.flexibleConnectedTo(this.elementRef)
.withPositions(
this.navbar?.overlayPosition ??
(this.level > 1
? [
{
originX: 'end',
originY: 'bottom',
overlayX: 'end',
overlayY: 'top',
offsetX: 2
}
]
: [
{ originX: 'start', originY: 'bottom', overlayX: 'start', overlayY: 'top' },
{
originX: 'end',
originY: 'bottom',
overlayX: 'end',
overlayY: 'top',
offsetX: -4
}
])
)
});
this.portal = new TemplatePortal(
this.dropdown(),
this.viewContainerRef,
this.dropdownData(),
this.injector
);
this.viewRef = this.overlayRef.attach(this.portal);
this.headerAnchorComponentRef = this.viewContainerRef.createComponent(SiHeaderAnchorComponent);
this.headerAnchorComponentRef.setInput('ariaOwns', this.ariaControls);
this.overlayRef
.outsidePointerEvents()
.pipe(
filter(event => event.type === 'click'),
filter(() => !this.openSubmenu),
takeUntil(this.dropdownClose),
take(1)
)
.subscribe(() => this.close());
}
}
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