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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import {
AfterViewInit,
ChangeDetectorRef,
Directive,
EmbeddedViewRef,
inject,
Injector,
IterableChangeRecord,
IterableChanges,
IterableDiffer,
IterableDiffers,
OnDestroy,
OutputRefSubscription,
TemplateRef,
ViewContainerRef
} from '@angular/core';
import { TREE_ITEM_CONTEXT } from '../si-tree-view-item-context';
import { SiTreeViewComponent } from '../si-tree-view.component';
import { TreeItem, TreeItemContext } from '../si-tree-view.model';
@Directive({
selector: '[siTreeViewItem]'
})
export class SiTreeViewItemDirective implements AfterViewInit, OnDestroy {
private templateRef = inject(TemplateRef);
private viewContainerRef = inject(ViewContainerRef);
private parent = inject(SiTreeViewComponent);
private differs = inject(IterableDiffers);
private cdRef = inject(ChangeDetectorRef);
private differ: IterableDiffer<TreeItem> | null = null;
private subscription!: OutputRefSubscription;
private itemsVirtualizedDirty = true;
ngAfterViewInit(): void {
if (this.itemsVirtualizedDirty) {
this.itemsVirtualizedDirty = false;
const value = this.parent.itemsVirtualized;
if (!this.differ && value) {
this.differ = this.differs.find(value).create((_index, item) => item);
}
}
this.evaluateDiffer();
this.subscription = this.parent.evaluateForTreeItemsDiffer.subscribe(_ =>
this.evaluateDiffer()
);
}
ngOnDestroy(): void {
this.subscription.unsubscribe();
}
private evaluateDiffer(): void {
if (this.differ) {
const changes = this.differ.diff(this.parent.itemsVirtualized);
if (changes) this.applyChanges(changes);
}
}
private applyChanges(changes: IterableChanges<TreeItem>): void {
const viewContainer = this.viewContainerRef;
changes.forEachOperation(
(
record: IterableChangeRecord<TreeItem>,
adjustedPreviousIndex: number | null,
currentIndex: number | null
) => {
if (record.previousIndex == null) {
viewContainer.createEmbeddedView(
this.templateRef,
{
treeItem: record.item,
index: record.currentIndex,
parent: this.parent
},
{
injector: Injector.create({
providers: [
{
provide: TREE_ITEM_CONTEXT,
useValue: {
record,
parent: this.parent
}
}
]
}),
index: currentIndex ?? undefined
}
);
} else if (currentIndex == null) {
viewContainer.remove(adjustedPreviousIndex ?? undefined);
} else IEif (adjustedPreviousIndex !== null) {
const view = viewContainer.get(adjustedPreviousIndex)!;
viewContainer.move(view, currentIndex);
(view as EmbeddedViewRef<TreeItemContext>).context = {
treeItem: record.item,
index: record.currentIndex!,
parent: this.parent
};
}
this.cdRef.detectChanges();
}
);
for (let i = 0, ilen = viewContainer.length; i < ilen; i++) {
const viewRef = viewContainer.get(i) as EmbeddedViewRef<TreeItemContext>;
const context = viewRef.context;
context.index = i;
}
changes.forEachIdentityChange((record: IterableChangeRecord<TreeItem>) => {
Iif (record.currentIndex) {
const viewRef = viewContainer.get(record.currentIndex) as EmbeddedViewRef<TreeItemContext>;
viewRef.context = {
treeItem: record.item,
index: record.currentIndex,
parent: this.parent
};
this.cdRef.detectChanges();
}
});
}
static ngTemplateContextGuard(
_dir: SiTreeViewItemDirective,
ctx: unknown
): ctx is TreeItemContext {
return true;
}
}
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