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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import { A11yModule, CdkTrapFocus } from '@angular/cdk/a11y';
import { BreakpointObserver } from '@angular/cdk/layout';
import { NgClass, NgTemplateOutlet } from '@angular/common';
import {
ChangeDetectionStrategy,
Component,
ElementRef,
inject,
Injector,
input,
OnDestroy,
signal,
TemplateRef,
viewChild
} from '@angular/core';
import {
HeaderWithDropdowns,
SI_HEADER_WITH_DROPDOWNS,
SiHeaderDropdownTriggerDirective
} from '@siemens/element-ng/header-dropdown';
import {
addIcons,
elementMenu,
elementThumbnails,
SiIconComponent
} from '@siemens/element-ng/icon';
import { BOOTSTRAP_BREAKPOINTS, Breakpoints } from '@siemens/element-ng/resize-observer';
import { SiTranslatePipe, t } from '@siemens/element-translate-ng/translate';
import { defer, of, Subject } from 'rxjs';
import { map, skip, takeUntil } from 'rxjs/operators';
/** Root component for the application header. */
@Component({
selector: 'si-application-header',
imports: [SiTranslatePipe, NgClass, A11yModule, NgTemplateOutlet, SiIconComponent],
templateUrl: './si-application-header.component.html',
styleUrl: './si-application-header.component.scss',
providers: [{ provide: SI_HEADER_WITH_DROPDOWNS, useExisting: SiApplicationHeaderComponent }],
changeDetection: ChangeDetectionStrategy.OnPush
})
export class SiApplicationHeaderComponent implements HeaderWithDropdowns, OnDestroy {
private static idCounter = 0;
/**
* Defines the minimum breakpoint which must be matched to expand the header / switch to desktop mode.
*
* @defaultValue 'sm'
*/
readonly expandBreakpoint = input<'sm' | 'md' | 'lg' | 'xl' | 'xxl' | 'never'>('sm');
readonly launchpad = input<TemplateRef<void>>();
/**
* @defaultValue
* ```
* t(() => $localize`:@@SI_APPLICATION_HEADER.LAUNCHPAD:Launchpad`)
* ```
*/
readonly launchpadLabel = input(t(() => $localize`:@@SI_APPLICATION_HEADER.LAUNCHPAD:Launchpad`));
/** @internal */
readonly closeMobileMenus = new Subject<void>();
/** @internal */
readonly mobileNavigationExpanded = signal(false);
/** @internal */
readonly hasNavigation = signal(false);
protected readonly openDropdownCount = signal(0);
protected readonly launchpadOpen = signal(false);
protected readonly id = `__si-application-header-${SiApplicationHeaderComponent.idCounter++}`;
protected toggleNavigation = t(
() => $localize`:@@SI_APPLICATION_HEADER.TOGGLE_NAVIGATION:Toggle navigation`
);
protected injector = inject(Injector);
protected readonly icons = addIcons({ elementThumbnails, elementMenu });
private readonly navigationToggle = viewChild<ElementRef<HTMLDivElement>>('navigationToggle');
private readonly focusTrap = viewChild.required(CdkTrapFocus);
private breakpointObserver = inject(BreakpointObserver);
private openDropdown?: SiHeaderDropdownTriggerDirective;
private closeMobileSub = this.closeMobileMenus.subscribe(() => {
this.closeMobileNavigation();
this.closeLaunchpad();
});
/** @internal */
// defer is required to re-check the current breakpoint as it may change.
readonly inlineDropdown = defer(() => {
const expandBreakpoint = this.expandBreakpoint();
if (expandBreakpoint === 'never') {
return of(true);
}
return this.breakpointObserver
.observe(
`(min-width: ${
BOOTSTRAP_BREAKPOINTS[(expandBreakpoint + 'Minimum') as keyof Breakpoints]
}px)`
)
.pipe(map(({ matches }) => !matches));
});
ngOnDestroy(): void {
this.closeMobileSub.unsubscribe();
this.closeMobileMenus.next();
this.closeMobileMenus.complete();
}
/** @internal */
onDropdownItemTriggered(): void {
this.closeMobileMenus.next();
}
/** @internal */
dropdownClosed(trigger?: SiHeaderDropdownTriggerDirective): void {
this.openDropdownCount.update(v => v - 1);
if (trigger === this.openDropdown) {
this.openDropdown = undefined;
}
}
/** @internal */
dropdownOpened(trigger?: SiHeaderDropdownTriggerDirective): void {
this.openDropdown ??= trigger;
this.openDropdownCount.update(v => v + 1);
this.closeLaunchpad();
}
/** @internal */
closeLaunchpad(): void {
if (this.launchpadOpen()) {
this.launchpadOpen.set(false);
this.dropdownClosed();
if (this.hasNavigation()) {
// This is also fine in expanded view when the mobile toggle is not visible.
// Then the focus call will be ignored.
this.navigationToggle()?.nativeElement.focus();
}
}
}
/** @internal */
openLaunchpad(): void {
if (!this.launchpadOpen()) {
this.dropdownOpened();
this.closeMobileMenus.next();
this.launchpadOpen.set(true);
this.inlineDropdown
.pipe(skip(1), takeUntil(this.closeMobileMenus))
.subscribe(() => this.closeMobileMenus.next());
}
}
protected toggleMobileNavigationExpanded(): void {
Iif (this.mobileNavigationExpanded()) {
this.closeMobileNavigation();
} else {
this.openMobileNavigation();
}
}
protected toggleLaunchpad(): void {
Iif (this.launchpadOpen()) {
this.closeLaunchpad();
} else {
this.openLaunchpad();
}
}
protected navigationEscapePressed(): void {
this.closeMobileNavigation();
this.navigationToggle()?.nativeElement.focus();
}
protected backdropClicked(): void {
this.closeMobileMenus.next();
}
private openMobileNavigation(): void {
if (!this.mobileNavigationExpanded()) {
this.closeMobileMenus.next();
this.mobileNavigationExpanded.set(true);
this.dropdownOpened();
this.inlineDropdown
.pipe(skip(1), takeUntil(this.closeMobileMenus))
.subscribe(() => this.closeMobileMenus.next());
this.focusTrap().focusTrap.focusFirstTabbableElementWhenReady();
}
}
private closeMobileNavigation(): void {
if (this.mobileNavigationExpanded()) {
this.mobileNavigationExpanded.set(false);
this.openDropdown?.close();
this.dropdownClosed();
}
}
}
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