import { isDataSource } from '@angular/cdk/collections'; import { ChangeDetectionStrategy, ChangeDetectorRef, Component, ContentChildren, Directive, ElementRef, Input, IterableDiffers, QueryList, ViewChild, ViewEncapsulation } from '@angular/core'; import { BehaviorSubject, isObservable, of as observableOf, Subject, } 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'; import { coerceNumberProperty } from '@angular/cdk/coercion'; /** * 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 && (typeof ngDevMode === 'undefined' || ngDevMode)) { 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 && (typeof ngDevMode === 'undefined' || ngDevMode)) { 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 if (typeof ngDevMode === 'undefined' || ngDevMode) { 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 && (typeof ngDevMode === 'undefined' || ngDevMode)) { 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: ``, 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(); CdkTreeNode.mostRecentTreeNode = this; // The classes are directly added here instead of in the host property because classes on // the host property are not inherited with View Engine. It is not set as a @HostBinding because // it is not set by the time it's children nodes try to read the class from it. // TODO: move to host after View Engine deprecation this._elementRef.nativeElement.classList.add('cdk-tree-node'); this.role = 'treeitem'; } /** * The role of the tree node. * @deprecated The correct role is 'treeitem', 'group' should not be used. This input will be * removed in a future version. * @breaking-change 12.0.0 Remove this input */ get role() { return 'treeitem'; } set role(_role) { // TODO: move to host after View Engine deprecation this._elementRef.nativeElement.setAttribute('role', _role); } /** 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); } _setExpanded(_expanded) { this._isAriaExpanded = _expanded; this._elementRef.nativeElement.setAttribute('aria-expanded', `${_expanded}`); } get level() { // If the treeControl has a getLevel method, use it to get the level. Otherwise read the // aria-level off the parent node and use it as the level for this node (note aria-level is // 1-indexed, while this property is 0-indexed, so we don't need to increment). return this._tree.treeControl.getLevel ? this._tree.treeControl.getLevel(this._data) : this._parentNodeAriaLevel; } ngOnInit() { this._parentNodeAriaLevel = getParentNodeAriaLevel(this._elementRef.nativeElement); this._elementRef.nativeElement.setAttribute('aria-level', `${this.level + 1}`); } ngDoCheck() { // aria-expanded is be set here because the expanded state is stored in the tree control and // the node isn't aware when the state is changed. // It is not set using a @HostBinding because they sometimes get lost with Mixin based classes. // TODO: move to host after View Engine deprecation if (this.isExpanded != this._isAriaExpanded) { this._setExpanded(this.isExpanded); } } 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(); } // TODO: role should eventually just be set in the component host _setRoleFromData() { if (!this._tree.treeControl.isExpandable && !this._tree.treeControl.getChildren && (typeof ngDevMode === 'undefined' || ngDevMode)) { throw getTreeControlFunctionsMissingError(); } this.role = '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', },] } ]; CdkTreeNode.ctorParameters = () => [ { type: ElementRef }, { type: CdkTree } ]; CdkTreeNode.propDecorators = { role: [{ type: Input }] }; function getParentNodeAriaLevel(nodeElement) { let parent = nodeElement.parentElement; while (parent && !isNodeElement(parent)) { parent = parent.parentElement; } if (!parent) { if (typeof ngDevMode === 'undefined' || ngDevMode) { throw Error('Incorrect tree structure containing detached node.'); } else { return -1; } } else if (parent.classList.contains('cdk-nested-tree-node')) { return coerceNumberProperty(parent.getAttribute('aria-level')); } else { // The ancestor element is the cdk-tree itself return 0; } } function isNodeElement(element) { const classList = element.classList; return !!((classList === null || classList === void 0 ? void 0 : classList.contains('cdk-nested-tree-node')) || (classList === null || classList === void 0 ? void 0 : classList.contains('cdk-tree'))); } //# 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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  DoCheck,\n  ElementRef,\n  Input,\n  IterableChangeRecord,\n  IterableDiffer,\n  IterableDiffers,\n  OnDestroy,\n  OnInit,\n  QueryList,\n  TrackByFunction,\n  ViewChild,\n  ViewContainerRef,\n  ViewEncapsulation\n} from '@angular/core';\nimport {\n  BehaviorSubject,\n  isObservable,\n  Observable,\n  of as observableOf,\n  Subject,\n  Subscription,\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';\nimport {coerceNumberProperty} from '@angular/cdk/coercion';\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, K = T> implements AfterContentChecked, CollectionViewer, OnDestroy, OnInit {\n  /** Subject that emits when the component has been destroyed. */\n  private readonly _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, K>;\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  readonly 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 && (typeof ngDevMode === 'undefined' || ngDevMode)) {\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 && (typeof ngDevMode === 'undefined' || ngDevMode)) {\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<readonly 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 if (typeof ngDevMode === 'undefined' || ngDevMode) {\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: readonly 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\n    if (!nodeDef && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw getTreeMissingMatchingNodeDefError();\n    }\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})\nexport class CdkTreeNode<T, K = T> implements DoCheck, FocusableOption, OnDestroy, OnInit {\n  /**\n   * The role of the tree node.\n   * @deprecated The correct role is 'treeitem', 'group' should not be used. This input will be\n   *   removed in a future version.\n   * @breaking-change 12.0.0 Remove this input\n   */\n  @Input() get role(): 'treeitem'|'group' { return 'treeitem'; }\n\n  set role(_role: 'treeitem'|'group') {\n    // TODO: move to host after View Engine deprecation\n    this._elementRef.nativeElement.setAttribute('role', _role);\n  }\n\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 readonly _destroyed = new Subject<void>();\n\n  /** Emits when the node's data has changed. */\n  readonly _dataChanges = new Subject<void>();\n\n  private _parentNodeAriaLevel: number;\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  private _setExpanded(_expanded: boolean) {\n    this._isAriaExpanded = _expanded;\n    this._elementRef.nativeElement.setAttribute('aria-expanded', `${_expanded}`);\n  }\n\n  protected _isAriaExpanded: boolean;\n\n  get level(): number {\n   // If the treeControl has a getLevel method, use it to get the level. Otherwise read the\n   // aria-level off the parent node and use it as the level for this node (note aria-level is\n   // 1-indexed, while this property is 0-indexed, so we don't need to increment).\n   return this._tree.treeControl.getLevel ?\n     this._tree.treeControl.getLevel(this._data) : this._parentNodeAriaLevel;\n   }\n\n  constructor(protected _elementRef: ElementRef<HTMLElement>,\n              protected _tree: CdkTree<T, K>) {\n    CdkTreeNode.mostRecentTreeNode = this as CdkTreeNode<T, K>;\n    // The classes are directly added here instead of in the host property because classes on\n    // the host property are not inherited with View Engine. It is not set as a @HostBinding because\n    // it is not set by the time it's children nodes try to read the class from it.\n    // TODO: move to host after View Engine deprecation\n    this._elementRef.nativeElement.classList.add('cdk-tree-node');\n    this.role = 'treeitem';\n  }\n\n  ngOnInit(): void {\n    this._parentNodeAriaLevel = getParentNodeAriaLevel(this._elementRef.nativeElement);\n    this._elementRef.nativeElement.setAttribute('aria-level', `${this.level + 1}`);\n  }\n\n  ngDoCheck() {\n    // aria-expanded is be set here because the expanded state is stored in the tree control and\n    // the node isn't aware when the state is changed.\n    // It is not set using a @HostBinding because they sometimes get lost with Mixin based classes.\n    // TODO: move to host after View Engine deprecation\n    if (this.isExpanded != this._isAriaExpanded) {\n      this._setExpanded(this.isExpanded);\n    }\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  // TODO: role should eventually just be set in the component host\n  protected _setRoleFromData(): void {\n    if (!this._tree.treeControl.isExpandable && !this._tree.treeControl.getChildren &&\n      (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw getTreeControlFunctionsMissingError();\n    }\n    this.role = 'treeitem';\n  }\n}\n\nfunction getParentNodeAriaLevel(nodeElement: HTMLElement): number {\n  let parent = nodeElement.parentElement;\n  while (parent && !isNodeElement(parent)) {\n    parent = parent.parentElement;\n  }\n  if (!parent) {\n    if (typeof ngDevMode === 'undefined' || ngDevMode) {\n      throw Error('Incorrect tree structure containing detached node.');\n    } else {\n      return -1;\n    }\n  } else if (parent.classList.contains('cdk-nested-tree-node')) {\n    return coerceNumberProperty(parent.getAttribute('aria-level')!);\n  } else {\n    // The ancestor element is the cdk-tree itself\n    return 0;\n  }\n}\n\nfunction isNodeElement(element: HTMLElement) {\n  const classList = element.classList;\n  return !!(classList?.contains('cdk-nested-tree-node') || classList?.contains('cdk-tree'));\n}\n"]}