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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import { ComponentPortal, DomPortalOutlet } from '@angular/cdk/portal';
import {
booleanAttribute,
ChangeDetectorRef,
computed,
Directive,
ElementRef,
inject,
Injector,
input,
OnChanges,
OnDestroy,
OnInit,
ViewContainerRef
} from '@angular/core';
import { BehaviorSubject, combineLatest, merge, Subscription, timer } from 'rxjs';
import { filter, map, switchMap, takeUntil } from 'rxjs/operators';
import {
LOADING_SPINNER_BLOCKING,
LOADING_SPINNER_OVERLAY,
SiLoadingSpinnerComponent
} from './si-loading-spinner.component';
@Directive({
selector: '[siLoading]',
host: {
class: 'position-relative'
}
})
export class SiLoadingSpinnerDirective implements OnInit, OnChanges, OnDestroy {
/**
* Displays the loading spinner when the value is either true or non-zero.
*/
readonly siLoading = input.required<boolean | number>();
/**
* Displays semi-transparent backdrop for the spinner, default is false.
*
* @defaultValue false
*/
readonly blocking = input(false, { transform: booleanAttribute });
/**
* Specifies if the spinner should be displayed after a delay, default is true.
*
* @defaultValue true
*/
readonly initialDelay = input(true, { transform: booleanAttribute });
private el = inject(ElementRef);
private readonly viewRef = inject(ViewContainerRef);
private cdRef = inject(ChangeDetectorRef);
private sub?: Subscription;
private progressSubject = new BehaviorSubject(false);
private off$ = this.progressSubject.pipe(filter(val => !val));
private on$ = this.progressSubject.pipe(filter(val => val));
private readonly initialWaitTime = computed(() => (this.initialDelay() ? 500 : 0));
private minSpinTime = 500;
private portalOutlet?: DomPortalOutlet;
private readonly compPortal = new ComponentPortal(
SiLoadingSpinnerComponent,
this.viewRef,
Injector.create({
providers: [
{ provide: LOADING_SPINNER_BLOCKING, useFactory: () => this.blocking() },
{
provide: LOADING_SPINNER_OVERLAY,
useValue: true
}
]
})
);
// this makes sure the spinner only displays with a delay of 500ms and stays for 500ms so
// that it doesn't flicker
protected readonly spinner$ = this.on$.pipe(
switchMap(() =>
merge(
timer(this.initialWaitTime()).pipe(
map(() => true),
takeUntil(this.off$)
),
combineLatest([this.off$, timer(this.initialWaitTime() + this.minSpinTime)]).pipe(
map(() => false)
)
)
)
);
private createPortal(): void {
this.portalOutlet ??= new DomPortalOutlet(this.el.nativeElement);
this.compPortal.attach(this.portalOutlet);
}
ngOnInit(): void {
this.sub = this.spinner$.subscribe(val => {
if (val) {
if (!this.compPortal.isAttached) {
this.createPortal();
}
} else if (this.compPortal.isAttached) {
this.compPortal.detach();
}
this.cdRef.markForCheck();
});
}
ngOnChanges(): void {
const newState = !!this.siLoading();
if (newState !== this.progressSubject.value) {
this.progressSubject.next(newState);
}
}
ngOnDestroy(): void {
this.sub?.unsubscribe();
if (this.compPortal.isAttached) {
this.compPortal.detach();
}
this.portalOutlet?.dispose();
}
}
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