@angular/cdk
Version:
Angular Material Component Development Kit
305 lines • 42.1 kB
JavaScript
import { isDataSource } from '@angular/cdk/collections';
import { ChangeDetectionStrategy, ChangeDetectorRef, Component, ContentChildren, Directive, ElementRef, Input, IterableDiffers, QueryList, ViewChild, ViewEncapsulation } from '@angular/core';
import { BehaviorSubject, of as observableOf, Subject, isObservable, } from 'rxjs';
import { takeUntil } from 'rxjs/operators';
import { CdkTreeNodeDef, CdkTreeNodeOutletContext } from './node';
import { CdkTreeNodeOutlet } from './outlet';
import { getTreeControlFunctionsMissingError, getTreeControlMissingError, getTreeMissingMatchingNodeDefError, getTreeMultipleDefaultNodeDefsError, getTreeNoValidDataSourceError } from './tree-errors';
/**
* CDK tree component that connects with a data source to retrieve data of type `T` and renders
* dataNodes with hierarchy. Updates the dataNodes when new data is provided by the data source.
*/
export class CdkTree {
constructor(_differs, _changeDetectorRef) {
this._differs = _differs;
this._changeDetectorRef = _changeDetectorRef;
/** Subject that emits when the component has been destroyed. */
this._onDestroy = new Subject();
/** Level of nodes */
this._levels = new Map();
// TODO(tinayuangao): Setup a listener for scrolling, emit the calculated view to viewChange.
// Remove the MAX_VALUE in viewChange
/**
* Stream containing the latest information on what rows are being displayed on screen.
* Can be used by the data source to as a heuristic of what data should be provided.
*/
this.viewChange = new BehaviorSubject({ start: 0, end: Number.MAX_VALUE });
}
/**
* Provides a stream containing the latest data array to render. Influenced by the tree's
* stream of view window (what dataNodes are currently on screen).
* Data source can be an observable of data array, or a data array to render.
*/
get dataSource() { return this._dataSource; }
set dataSource(dataSource) {
if (this._dataSource !== dataSource) {
this._switchDataSource(dataSource);
}
}
ngOnInit() {
this._dataDiffer = this._differs.find([]).create(this.trackBy);
if (!this.treeControl) {
throw getTreeControlMissingError();
}
}
ngOnDestroy() {
this._nodeOutlet.viewContainer.clear();
this.viewChange.complete();
this._onDestroy.next();
this._onDestroy.complete();
if (this._dataSource && typeof this._dataSource.disconnect === 'function') {
this.dataSource.disconnect(this);
}
if (this._dataSubscription) {
this._dataSubscription.unsubscribe();
this._dataSubscription = null;
}
}
ngAfterContentChecked() {
const defaultNodeDefs = this._nodeDefs.filter(def => !def.when);
if (defaultNodeDefs.length > 1) {
throw getTreeMultipleDefaultNodeDefsError();
}
this._defaultNodeDef = defaultNodeDefs[0];
if (this.dataSource && this._nodeDefs && !this._dataSubscription) {
this._observeRenderChanges();
}
}
// TODO(tinayuangao): Work on keyboard traversal and actions, make sure it's working for RTL
// and nested trees.
/**
* Switch to the provided data source by resetting the data and unsubscribing from the current
* render change subscription if one exists. If the data source is null, interpret this by
* clearing the node outlet. Otherwise start listening for new data.
*/
_switchDataSource(dataSource) {
if (this._dataSource && typeof this._dataSource.disconnect === 'function') {
this.dataSource.disconnect(this);
}
if (this._dataSubscription) {
this._dataSubscription.unsubscribe();
this._dataSubscription = null;
}
// Remove the all dataNodes if there is now no data source
if (!dataSource) {
this._nodeOutlet.viewContainer.clear();
}
this._dataSource = dataSource;
if (this._nodeDefs) {
this._observeRenderChanges();
}
}
/** Set up a subscription for the data provided by the data source. */
_observeRenderChanges() {
let dataStream;
if (isDataSource(this._dataSource)) {
dataStream = this._dataSource.connect(this);
}
else if (isObservable(this._dataSource)) {
dataStream = this._dataSource;
}
else if (Array.isArray(this._dataSource)) {
dataStream = observableOf(this._dataSource);
}
if (dataStream) {
this._dataSubscription = dataStream.pipe(takeUntil(this._onDestroy))
.subscribe(data => this.renderNodeChanges(data));
}
else {
throw getTreeNoValidDataSourceError();
}
}
/** Check for changes made in the data and render each change (node added/removed/moved). */
renderNodeChanges(data, dataDiffer = this._dataDiffer, viewContainer = this._nodeOutlet.viewContainer, parentData) {
const changes = dataDiffer.diff(data);
if (!changes) {
return;
}
changes.forEachOperation((item, adjustedPreviousIndex, currentIndex) => {
if (item.previousIndex == null) {
this.insertNode(data[currentIndex], currentIndex, viewContainer, parentData);
}
else if (currentIndex == null) {
viewContainer.remove(adjustedPreviousIndex);
this._levels.delete(item.item);
}
else {
const view = viewContainer.get(adjustedPreviousIndex);
viewContainer.move(view, currentIndex);
}
});
this._changeDetectorRef.detectChanges();
}
/**
* Finds the matching node definition that should be used for this node data. If there is only
* one node definition, it is returned. Otherwise, find the node definition that has a when
* predicate that returns true with the data. If none return true, return the default node
* definition.
*/
_getNodeDef(data, i) {
if (this._nodeDefs.length === 1) {
return this._nodeDefs.first;
}
const nodeDef = this._nodeDefs.find(def => def.when && def.when(i, data)) || this._defaultNodeDef;
if (!nodeDef) {
throw getTreeMissingMatchingNodeDefError();
}
return nodeDef;
}
/**
* Create the embedded view for the data node template and place it in the correct index location
* within the data node view container.
*/
insertNode(nodeData, index, viewContainer, parentData) {
const node = this._getNodeDef(nodeData, index);
// Node context that will be provided to created embedded view
const context = new CdkTreeNodeOutletContext(nodeData);
// If the tree is flat tree, then use the `getLevel` function in flat tree control
// Otherwise, use the level of parent node.
if (this.treeControl.getLevel) {
context.level = this.treeControl.getLevel(nodeData);
}
else if (typeof parentData !== 'undefined' && this._levels.has(parentData)) {
context.level = this._levels.get(parentData) + 1;
}
else {
context.level = 0;
}
this._levels.set(nodeData, context.level);
// Use default tree nodeOutlet, or nested node's nodeOutlet
const container = viewContainer ? viewContainer : this._nodeOutlet.viewContainer;
container.createEmbeddedView(node.template, context, index);
// Set the data to just created `CdkTreeNode`.
// The `CdkTreeNode` created from `createEmbeddedView` will be saved in static variable
// `mostRecentTreeNode`. We get it from static variable and pass the node data to it.
if (CdkTreeNode.mostRecentTreeNode) {
CdkTreeNode.mostRecentTreeNode.data = nodeData;
}
}
}
CdkTree.decorators = [
{ type: Component, args: [{
selector: 'cdk-tree',
exportAs: 'cdkTree',
template: `<ng-container cdkTreeNodeOutlet></ng-container>`,
host: {
'class': 'cdk-tree',
'role': 'tree',
},
encapsulation: ViewEncapsulation.None,
// The "OnPush" status for the `CdkTree` component is effectively a noop, so we are removing it.
// The view for `CdkTree` consists entirely of templates declared in other views. As they are
// declared elsewhere, they are checked when their declaration points are checked.
// tslint:disable-next-line:validate-decorators
changeDetection: ChangeDetectionStrategy.Default
},] }
];
CdkTree.ctorParameters = () => [
{ type: IterableDiffers },
{ type: ChangeDetectorRef }
];
CdkTree.propDecorators = {
dataSource: [{ type: Input }],
treeControl: [{ type: Input }],
trackBy: [{ type: Input }],
_nodeOutlet: [{ type: ViewChild, args: [CdkTreeNodeOutlet, { static: true },] }],
_nodeDefs: [{ type: ContentChildren, args: [CdkTreeNodeDef, {
// We need to use `descendants: true`, because Ivy will no longer match
// indirect descendants if it's left as false.
descendants: true
},] }]
};
/**
* Tree node for CdkTree. It contains the data in the tree node.
*/
export class CdkTreeNode {
constructor(_elementRef, _tree) {
this._elementRef = _elementRef;
this._tree = _tree;
/** Subject that emits when the component has been destroyed. */
this._destroyed = new Subject();
/** Emits when the node's data has changed. */
this._dataChanges = new Subject();
/**
* The role of the node should be 'group' if it's an internal node,
* and 'treeitem' if it's a leaf node.
*/
this.role = 'treeitem';
CdkTreeNode.mostRecentTreeNode = this;
}
/** The tree node's data. */
get data() { return this._data; }
set data(value) {
if (value !== this._data) {
this._data = value;
this._setRoleFromData();
this._dataChanges.next();
}
}
get isExpanded() {
return this._tree.treeControl.isExpanded(this._data);
}
get level() {
return this._tree.treeControl.getLevel ? this._tree.treeControl.getLevel(this._data) : 0;
}
ngOnDestroy() {
// If this is the last tree node being destroyed,
// clear out the reference to avoid leaking memory.
if (CdkTreeNode.mostRecentTreeNode === this) {
CdkTreeNode.mostRecentTreeNode = null;
}
this._dataChanges.complete();
this._destroyed.next();
this._destroyed.complete();
}
/** Focuses the menu item. Implements for FocusableOption. */
focus() {
this._elementRef.nativeElement.focus();
}
_setRoleFromData() {
if (this._tree.treeControl.isExpandable) {
this.role = this._tree.treeControl.isExpandable(this._data) ? 'group' : 'treeitem';
}
else {
if (!this._tree.treeControl.getChildren) {
throw getTreeControlFunctionsMissingError();
}
const childrenNodes = this._tree.treeControl.getChildren(this._data);
if (Array.isArray(childrenNodes)) {
this._setRoleFromChildren(childrenNodes);
}
else if (isObservable(childrenNodes)) {
childrenNodes.pipe(takeUntil(this._destroyed))
.subscribe(children => this._setRoleFromChildren(children));
}
}
}
_setRoleFromChildren(children) {
this.role = children && children.length ? 'group' : 'treeitem';
}
}
/**
* The most recently created `CdkTreeNode`. We save it in static variable so we can retrieve it
* in `CdkTree` and set the data to it.
*/
CdkTreeNode.mostRecentTreeNode = null;
CdkTreeNode.decorators = [
{ type: Directive, args: [{
selector: 'cdk-tree-node',
exportAs: 'cdkTreeNode',
host: {
'[attr.aria-expanded]': 'isExpanded',
'[attr.aria-level]': 'role === "treeitem" ? level : null',
'[attr.role]': 'role',
'class': 'cdk-tree-node',
},
},] }
];
CdkTreeNode.ctorParameters = () => [
{ type: ElementRef },
{ type: CdkTree }
];
CdkTreeNode.propDecorators = {
role: [{ type: Input }]
};
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\nimport {FocusableOption} from '@angular/cdk/a11y';\nimport {CollectionViewer, DataSource, isDataSource} from '@angular/cdk/collections';\nimport {\n  AfterContentChecked,\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  ContentChildren,\n  Directive,\n  ElementRef,\n  Input,\n  IterableChangeRecord,\n  IterableDiffer,\n  IterableDiffers,\n  OnDestroy,\n  OnInit,\n  QueryList,\n  ViewChild,\n  ViewContainerRef,\n  ViewEncapsulation,\n  TrackByFunction\n} from '@angular/core';\nimport {\n  BehaviorSubject,\n  Observable,\n  of as observableOf,\n  Subject,\n  Subscription,\n  isObservable,\n} from 'rxjs';\nimport {takeUntil} from 'rxjs/operators';\nimport {TreeControl} from './control/tree-control';\nimport {CdkTreeNodeDef, CdkTreeNodeOutletContext} from './node';\nimport {CdkTreeNodeOutlet} from './outlet';\nimport {\n  getTreeControlFunctionsMissingError,\n  getTreeControlMissingError,\n  getTreeMissingMatchingNodeDefError,\n  getTreeMultipleDefaultNodeDefsError,\n  getTreeNoValidDataSourceError\n} from './tree-errors';\n\n/**\n * CDK tree component that connects with a data source to retrieve data of type `T` and renders\n * dataNodes with hierarchy. Updates the dataNodes when new data is provided by the data source.\n */\n@Component({\n  selector: 'cdk-tree',\n  exportAs: 'cdkTree',\n  template: `<ng-container cdkTreeNodeOutlet></ng-container>`,\n  host: {\n    'class': 'cdk-tree',\n    'role': 'tree',\n  },\n  encapsulation: ViewEncapsulation.None,\n\n  // The \"OnPush\" status for the `CdkTree` component is effectively a noop, so we are removing it.\n  // The view for `CdkTree` consists entirely of templates declared in other views. As they are\n  // declared elsewhere, they are checked when their declaration points are checked.\n  // tslint:disable-next-line:validate-decorators\n  changeDetection: ChangeDetectionStrategy.Default\n})\nexport class CdkTree<T> implements AfterContentChecked, CollectionViewer, OnDestroy, OnInit {\n  /** Subject that emits when the component has been destroyed. */\n  private _onDestroy = new Subject<void>();\n\n  /** Differ used to find the changes in the data provided by the data source. */\n  private _dataDiffer: IterableDiffer<T>;\n\n  /** Stores the node definition that does not have a when predicate. */\n  private _defaultNodeDef: CdkTreeNodeDef<T> | null;\n\n  /** Data subscription */\n  private _dataSubscription: Subscription | null;\n\n  /** Level of nodes */\n  private _levels: Map<T, number> = new Map<T, number>();\n\n  /**\n   * Provides a stream containing the latest data array to render. Influenced by the tree's\n   * stream of view window (what dataNodes are currently on screen).\n   * Data source can be an observable of data array, or a data array to render.\n   */\n  @Input()\n  get dataSource(): DataSource<T> | Observable<T[]> | T[] { return this._dataSource; }\n  set dataSource(dataSource: DataSource<T> | Observable<T[]> | T[]) {\n    if (this._dataSource !== dataSource) {\n      this._switchDataSource(dataSource);\n    }\n  }\n  private _dataSource: DataSource<T> | Observable<T[]> | T[];\n\n  /** The tree controller */\n  @Input() treeControl: TreeControl<T>;\n\n  /**\n   * Tracking function that will be used to check the differences in data changes. Used similarly\n   * to `ngFor` `trackBy` function. Optimize node operations by identifying a node based on its data\n   * relative to the function to know if a node should be added/removed/moved.\n   * Accepts a function that takes two parameters, `index` and `item`.\n   */\n  @Input() trackBy: TrackByFunction<T>;\n\n  // Outlets within the tree's template where the dataNodes will be inserted.\n  @ViewChild(CdkTreeNodeOutlet, {static: true}) _nodeOutlet: CdkTreeNodeOutlet;\n\n  /** The tree node template for the tree */\n  @ContentChildren(CdkTreeNodeDef, {\n    // We need to use `descendants: true`, because Ivy will no longer match\n    // indirect descendants if it's left as false.\n    descendants: true\n  }) _nodeDefs: QueryList<CdkTreeNodeDef<T>>;\n\n  // TODO(tinayuangao): Setup a listener for scrolling, emit the calculated view to viewChange.\n  //     Remove the MAX_VALUE in viewChange\n  /**\n   * Stream containing the latest information on what rows are being displayed on screen.\n   * Can be used by the data source to as a heuristic of what data should be provided.\n   */\n  viewChange =\n    new BehaviorSubject<{start: number, end: number}>({start: 0, end: Number.MAX_VALUE});\n\n  constructor(private _differs: IterableDiffers,\n              private _changeDetectorRef: ChangeDetectorRef) {}\n\n  ngOnInit() {\n    this._dataDiffer = this._differs.find([]).create(this.trackBy);\n    if (!this.treeControl) {\n      throw getTreeControlMissingError();\n    }\n  }\n\n  ngOnDestroy() {\n    this._nodeOutlet.viewContainer.clear();\n\n    this.viewChange.complete();\n    this._onDestroy.next();\n    this._onDestroy.complete();\n\n    if (this._dataSource && typeof (this._dataSource as DataSource<T>).disconnect === 'function') {\n      (this.dataSource as DataSource<T>).disconnect(this);\n    }\n\n    if (this._dataSubscription) {\n      this._dataSubscription.unsubscribe();\n      this._dataSubscription = null;\n    }\n  }\n\n  ngAfterContentChecked() {\n    const defaultNodeDefs = this._nodeDefs.filter(def => !def.when);\n    if (defaultNodeDefs.length > 1) {\n      throw getTreeMultipleDefaultNodeDefsError();\n    }\n    this._defaultNodeDef = defaultNodeDefs[0];\n\n    if (this.dataSource && this._nodeDefs && !this._dataSubscription) {\n      this._observeRenderChanges();\n    }\n  }\n\n\n  // TODO(tinayuangao): Work on keyboard traversal and actions, make sure it's working for RTL\n  //     and nested trees.\n\n  /**\n   * Switch to the provided data source by resetting the data and unsubscribing from the current\n   * render change subscription if one exists. If the data source is null, interpret this by\n   * clearing the node outlet. Otherwise start listening for new data.\n   */\n  private _switchDataSource(dataSource: DataSource<T> | Observable<T[]> | T[]) {\n    if (this._dataSource && typeof (this._dataSource as DataSource<T>).disconnect === 'function') {\n      (this.dataSource as DataSource<T>).disconnect(this);\n    }\n\n    if (this._dataSubscription) {\n      this._dataSubscription.unsubscribe();\n      this._dataSubscription = null;\n    }\n\n    // Remove the all dataNodes if there is now no data source\n    if (!dataSource) {\n      this._nodeOutlet.viewContainer.clear();\n    }\n\n    this._dataSource = dataSource;\n    if (this._nodeDefs) {\n      this._observeRenderChanges();\n    }\n  }\n\n  /** Set up a subscription for the data provided by the data source. */\n  private _observeRenderChanges() {\n    let dataStream: Observable<T[] | ReadonlyArray<T>> | undefined;\n\n    if (isDataSource(this._dataSource)) {\n      dataStream = this._dataSource.connect(this);\n    } else if (isObservable(this._dataSource)) {\n      dataStream = this._dataSource;\n    } else if (Array.isArray(this._dataSource)) {\n      dataStream = observableOf(this._dataSource);\n    }\n\n    if (dataStream) {\n      this._dataSubscription = dataStream.pipe(takeUntil(this._onDestroy))\n        .subscribe(data => this.renderNodeChanges(data));\n    } else {\n      throw getTreeNoValidDataSourceError();\n    }\n  }\n\n  /** Check for changes made in the data and render each change (node added/removed/moved). */\n  renderNodeChanges(data: T[] | ReadonlyArray<T>, dataDiffer: IterableDiffer<T> = this._dataDiffer,\n                    viewContainer: ViewContainerRef = this._nodeOutlet.viewContainer,\n                    parentData?: T) {\n    const changes = dataDiffer.diff(data);\n    if (!changes) { return; }\n\n    changes.forEachOperation((item: IterableChangeRecord<T>,\n                              adjustedPreviousIndex: number | null,\n                              currentIndex: number | null) => {\n        if (item.previousIndex == null) {\n          this.insertNode(data[currentIndex!], currentIndex!, viewContainer, parentData);\n        } else if (currentIndex == null) {\n          viewContainer.remove(adjustedPreviousIndex!);\n          this._levels.delete(item.item);\n        } else {\n          const view = viewContainer.get(adjustedPreviousIndex!);\n          viewContainer.move(view!, currentIndex);\n        }\n      });\n\n    this._changeDetectorRef.detectChanges();\n  }\n\n  /**\n   * Finds the matching node definition that should be used for this node data. If there is only\n   * one node definition, it is returned. Otherwise, find the node definition that has a when\n   * predicate that returns true with the data. If none return true, return the default node\n   * definition.\n   */\n  _getNodeDef(data: T, i: number): CdkTreeNodeDef<T> {\n    if (this._nodeDefs.length === 1) { return this._nodeDefs.first; }\n\n    const nodeDef =\n      this._nodeDefs.find(def => def.when && def.when(i, data)) || this._defaultNodeDef;\n    if (!nodeDef) { throw getTreeMissingMatchingNodeDefError(); }\n\n    return nodeDef;\n  }\n\n  /**\n   * Create the embedded view for the data node template and place it in the correct index location\n   * within the data node view container.\n   */\n  insertNode(nodeData: T, index: number, viewContainer?: ViewContainerRef, parentData?: T) {\n    const node = this._getNodeDef(nodeData, index);\n\n    // Node context that will be provided to created embedded view\n    const context = new CdkTreeNodeOutletContext<T>(nodeData);\n\n    // If the tree is flat tree, then use the `getLevel` function in flat tree control\n    // Otherwise, use the level of parent node.\n    if (this.treeControl.getLevel) {\n      context.level = this.treeControl.getLevel(nodeData);\n    } else if (typeof parentData !== 'undefined' && this._levels.has(parentData)) {\n      context.level = this._levels.get(parentData)! + 1;\n    } else {\n      context.level = 0;\n    }\n    this._levels.set(nodeData, context.level);\n\n    // Use default tree nodeOutlet, or nested node's nodeOutlet\n    const container = viewContainer ? viewContainer : this._nodeOutlet.viewContainer;\n    container.createEmbeddedView(node.template, context, index);\n\n    // Set the data to just created `CdkTreeNode`.\n    // The `CdkTreeNode` created from `createEmbeddedView` will be saved in static variable\n    //     `mostRecentTreeNode`. We get it from static variable and pass the node data to it.\n    if (CdkTreeNode.mostRecentTreeNode) {\n      CdkTreeNode.mostRecentTreeNode.data = nodeData;\n    }\n  }\n}\n\n\n/**\n * Tree node for CdkTree. It contains the data in the tree node.\n */\n@Directive({\n  selector: 'cdk-tree-node',\n  exportAs: 'cdkTreeNode',\n  host: {\n    '[attr.aria-expanded]': 'isExpanded',\n    '[attr.aria-level]': 'role === \"treeitem\" ? level : null',\n    '[attr.role]': 'role',\n    'class': 'cdk-tree-node',\n  },\n})\nexport class CdkTreeNode<T> implements FocusableOption, OnDestroy {\n  /**\n   * The most recently created `CdkTreeNode`. We save it in static variable so we can retrieve it\n   * in `CdkTree` and set the data to it.\n   */\n  static mostRecentTreeNode: CdkTreeNode<any> | null = null;\n\n  /** Subject that emits when the component has been destroyed. */\n  protected _destroyed = new Subject<void>();\n\n  /** Emits when the node's data has changed. */\n  _dataChanges = new Subject<void>();\n\n  /** The tree node's data. */\n  get data(): T { return this._data; }\n  set data(value: T) {\n    if (value !== this._data) {\n      this._data = value;\n      this._setRoleFromData();\n      this._dataChanges.next();\n    }\n  }\n  protected _data: T;\n\n  get isExpanded(): boolean {\n    return this._tree.treeControl.isExpanded(this._data);\n  }\n\n  get level(): number {\n    return this._tree.treeControl.getLevel ? this._tree.treeControl.getLevel(this._data) : 0;\n  }\n\n  /**\n   * The role of the node should be 'group' if it's an internal node,\n   * and 'treeitem' if it's a leaf node.\n   */\n  @Input() role: 'treeitem' | 'group' = 'treeitem';\n\n  constructor(protected _elementRef: ElementRef<HTMLElement>,\n              protected _tree: CdkTree<T>) {\n    CdkTreeNode.mostRecentTreeNode = this as CdkTreeNode<T>;\n  }\n\n  ngOnDestroy() {\n    // If this is the last tree node being destroyed,\n    // clear out the reference to avoid leaking memory.\n    if (CdkTreeNode.mostRecentTreeNode === this) {\n      CdkTreeNode.mostRecentTreeNode = null;\n    }\n\n    this._dataChanges.complete();\n    this._destroyed.next();\n    this._destroyed.complete();\n  }\n\n  /** Focuses the menu item. Implements for FocusableOption. */\n  focus(): void {\n    this._elementRef.nativeElement.focus();\n  }\n\n  protected _setRoleFromData(): void {\n    if (this._tree.treeControl.isExpandable) {\n      this.role = this._tree.treeControl.isExpandable(this._data) ? 'group' : 'treeitem';\n    } else {\n      if (!this._tree.treeControl.getChildren) {\n        throw getTreeControlFunctionsMissingError();\n      }\n      const childrenNodes = this._tree.treeControl.getChildren(this._data);\n      if (Array.isArray(childrenNodes)) {\n        this._setRoleFromChildren(childrenNodes as T[]);\n      } else if (isObservable(childrenNodes)) {\n        childrenNodes.pipe(takeUntil(this._destroyed))\n            .subscribe(children => this._setRoleFromChildren(children));\n      }\n    }\n  }\n\n  protected _setRoleFromChildren(children: T[]) {\n    this.role = children && children.length ? 'group' : 'treeitem';\n  }\n}\n"]}