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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import {
AfterViewInit,
booleanAttribute,
ChangeDetectorRef,
contentChild,
contentChildren,
Directive,
ElementRef,
inject,
INJECTOR,
input,
OnChanges,
OnDestroy,
SimpleChanges
} from '@angular/core';
import { toObservable } from '@angular/core/rxjs-interop';
import { ResizeObserverService } from '@siemens/element-ng/resize-observer';
import { BehaviorSubject, combineLatest, of, Subscription } from 'rxjs';
import { auditTime, distinctUntilChanged, map, startWith, switchMap } from 'rxjs/operators';
import { SiAutoCollapsableListAdditionalContentDirective } from './si-auto-collapsable-list-additional-content.directive';
import { SiAutoCollapsableListItemDirective } from './si-auto-collapsable-list-item.directive';
import { SiAutoCollapsableListOverflowItemDirective } from './si-auto-collapsable-list-overflow-item.directive';
@Directive({
selector: '[siAutoCollapsableList]',
host: {
style: 'position: relative',
'[style.overflow]': 'siAutoCollapsableList() ? "hidden" : ""'
},
exportAs: 'siAutoCollapsableList'
})
export class SiAutoCollapsableListDirective implements AfterViewInit, OnChanges, OnDestroy {
/**
* The items which are displayed in the siAutoCollapsableList.
*/
readonly items = contentChildren(SiAutoCollapsableListItemDirective);
private readonly overflowItem = contentChild(SiAutoCollapsableListOverflowItemDirective);
private readonly additionalContent = contentChildren(
SiAutoCollapsableListAdditionalContentDirective
);
/** @defaultValue true */
readonly siAutoCollapsableList = input(true, { transform: booleanAttribute });
/**
* The (flex) gap in pixels, will automatically be set if a pixel value is used in CSS.
*/
readonly gap = input<number>();
/**
* The element which size is available for the content of the siAutoCollapsableList.
*
* @defaultValue undefined
*/
readonly containerElement = input<HTMLElement | undefined | null>(undefined, {
alias: 'siAutoCollapsableListContainerElement'
});
private resizeSubscription?: Subscription;
private disableInitSubscription?: Subscription;
private readonly elementRef = inject(ElementRef);
private readonly resizeObserverService = inject(ResizeObserverService);
private readonly changeDetectorRef = inject(ChangeDetectorRef);
private readonly containerElementSubject = new BehaviorSubject<HTMLElement | null>(
this.elementRef.nativeElement
);
/**
* The same as {@link gap}, but automatically read from the computed styles.
* Used if not set by user.
*/
private computedGap = 0;
private injector = inject(INJECTOR);
ngAfterViewInit(): void {
if (this.siAutoCollapsableList()) {
this.readGapSize();
this.setupResizeListener();
} else {
this.reset();
}
}
ngOnChanges(changes: SimpleChanges): void {
if (changes.siAutoCollapsableList) {
const siAutoCollapsableList = this.siAutoCollapsableList();
if (!siAutoCollapsableList && this.resizeSubscription) {
this.reset();
} else if (siAutoCollapsableList && !this.resizeSubscription && this.items()) {
this.setupResizeListener();
}
}
if (changes.containerElement) {
this.containerElementSubject.next(this.containerElement() ?? this.elementRef.nativeElement);
}
}
ngOnDestroy(): void {
this.resizeSubscription?.unsubscribe();
this.disableInitSubscription?.unsubscribe();
this.containerElementSubject.complete();
}
private setupResizeListener(): void {
this.disableInitSubscription?.unsubscribe();
const containerSize$ = this.containerElementSubject.pipe(
switchMap(element => this.resizeObserverService.observe(element!, 0, true, true)),
map(size => size.width),
distinctUntilChanged(),
map(size => {
const { paddingInlineStart, paddingInlineEnd } = getComputedStyle(
this.containerElement() ?? this.elementRef.nativeElement
);
return size - parseFloat(paddingInlineStart) - parseFloat(paddingInlineEnd);
})
);
const itemSizes$ = toObservable(this.items, { injector: this.injector }).pipe(
startWith(this.items()),
switchMap(items =>
!items.length
? of([])
: combineLatest(
items.map(item =>
item.size$.pipe(
map(size => ({
size,
directive: item
}))
)
)
)
)
);
const additionalContentSizes$ = toObservable(this.additionalContent, {
injector: this.injector
}).pipe(
startWith(this.additionalContent()),
switchMap(additionalContent => combineLatest(additionalContent.map(item => item.size$))),
startWith([])
);
this.resizeSubscription = combineLatest([
containerSize$,
this.overflowItem()?.size$ ?? of(0),
itemSizes$,
additionalContentSizes$
])
.pipe(auditTime(0))
.subscribe(([containerSize, overflowItemSize, items, additionalContentSizes]) =>
this.updateItemVisibility(containerSize, overflowItemSize, items, additionalContentSizes)
);
}
private updateItemVisibility(
containerSize: number,
overflowItemSize: number,
items: { size: number; directive: SiAutoCollapsableListItemDirective }[],
additionalContent: number[]
): void {
let remainingSpace = containerSize - additionalContent.reduce((a, b) => a + b, 0);
const itemsRemaining = items.slice();
const gap = this.gap() ?? this.computedGap;
while (remainingSpace > 0 && itemsRemaining.length) {
const item = itemsRemaining.shift()!;
if (remainingSpace - item.size - gap - overflowItemSize >= 0) {
// There is space for the item and an overflow item.
item.directive.canBeVisible.set(true);
remainingSpace -= item.size + gap;
} else if (
!itemsRemaining.length &&
(remainingSpace - item.size >= 0 || overflowItemSize >= item.size)
) {
// There are no other items remaining and there is enough space or the overflow item is biggger than the current one.
item.directive.canBeVisible.set(true);
remainingSpace = 0;
} else {
// There is no space for the item.
remainingSpace = 0;
item.directive.canBeVisible.set(false);
}
}
itemsRemaining.forEach(item => item.directive.canBeVisible.set(false));
const overflowItem = this.overflowItem();
if (overflowItem) {
overflowItem.hiddenItemCount = this.items().filter(item => !item.canBeVisible()).length;
overflowItem.canBeVisible.set(overflowItem.hiddenItemCount !== 0);
}
this.changeDetectorRef.markForCheck();
}
private reset(): void {
this.resizeSubscription?.unsubscribe();
this.resizeSubscription = undefined;
this.disableInitSubscription = toObservable(this.items, { injector: this.injector }).subscribe(
items =>
queueMicrotask(() => {
items.forEach(item => item.canBeVisible.set(true));
})
);
const overflowItem = this.overflowItem();
if (overflowItem) {
queueMicrotask(() => {
overflowItem!.canBeVisible.set(false);
overflowItem!.hiddenItemCount = 0;
});
}
}
private readGapSize(): void {
const { gap } = getComputedStyle(this.containerElement() ?? this.elementRef.nativeElement);
if (gap.endsWith('px') || gap === '0') {
this.computedGap = parseFloat(gap);
}
}
}
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