41 lines
1.1 KiB
TypeScript
41 lines
1.1 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.dev/license
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*/
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import {CollectionViewer, DataSource} from '@angular/cdk/collections';
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import {BehaviorSubject, merge, Observable} from 'rxjs';
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import {map} from 'rxjs/operators';
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/**
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* Data source for nested tree.
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*
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* The data source for nested tree doesn't have to consider node flattener, or the way to expand
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* or collapse. The expansion/collapsion will be handled by TreeControl and each non-leaf node.
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*/
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export class MatTreeNestedDataSource<T> extends DataSource<T> {
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/**
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* Data for the nested tree
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*/
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get data() {
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return this._data.value;
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}
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set data(value: T[]) {
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this._data.next(value);
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}
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private readonly _data = new BehaviorSubject<T[]>([]);
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connect(collectionViewer: CollectionViewer): Observable<T[]> {
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return merge(...([collectionViewer.viewChange, this._data] as Observable<unknown>[])).pipe(
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map(() => this.data),
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);
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}
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disconnect() {
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// no op
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}
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}
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