| /** |
| * @license |
| * Copyright Google LLC All Rights Reserved. |
| * |
| * Use of this source code is governed by an MIT-style license that can be |
| * found in the LICENSE file at https://angular.io/license |
| */ |
| import { DataSource } from '@angular/cdk/collections'; |
| import { BehaviorSubject, merge } from 'rxjs'; |
| import { map, take } from 'rxjs/operators'; |
| /** |
| * Tree flattener to convert a normal type of node to node with children & level information. |
| * Transform nested nodes of type `T` to flattened nodes of type `F`. |
| * |
| * For example, the input data of type `T` is nested, and contains its children data: |
| * SomeNode: { |
| * key: 'Fruits', |
| * children: [ |
| * NodeOne: { |
| * key: 'Apple', |
| * }, |
| * NodeTwo: { |
| * key: 'Pear', |
| * } |
| * ] |
| * } |
| * After flattener flatten the tree, the structure will become |
| * SomeNode: { |
| * key: 'Fruits', |
| * expandable: true, |
| * level: 1 |
| * }, |
| * NodeOne: { |
| * key: 'Apple', |
| * expandable: false, |
| * level: 2 |
| * }, |
| * NodeTwo: { |
| * key: 'Pear', |
| * expandable: false, |
| * level: 2 |
| * } |
| * and the output flattened type is `F` with additional information. |
| */ |
| export class MatTreeFlattener { |
| constructor(transformFunction, getLevel, isExpandable, getChildren) { |
| this.transformFunction = transformFunction; |
| this.getLevel = getLevel; |
| this.isExpandable = isExpandable; |
| this.getChildren = getChildren; |
| } |
| _flattenNode(node, level, resultNodes, parentMap) { |
| const flatNode = this.transformFunction(node, level); |
| resultNodes.push(flatNode); |
| if (this.isExpandable(flatNode)) { |
| const childrenNodes = this.getChildren(node); |
| if (childrenNodes) { |
| if (Array.isArray(childrenNodes)) { |
| this._flattenChildren(childrenNodes, level, resultNodes, parentMap); |
| } |
| else { |
| childrenNodes.pipe(take(1)).subscribe(children => { |
| this._flattenChildren(children, level, resultNodes, parentMap); |
| }); |
| } |
| } |
| } |
| return resultNodes; |
| } |
| _flattenChildren(children, level, resultNodes, parentMap) { |
| children.forEach((child, index) => { |
| let childParentMap = parentMap.slice(); |
| childParentMap.push(index != children.length - 1); |
| this._flattenNode(child, level + 1, resultNodes, childParentMap); |
| }); |
| } |
| /** |
| * Flatten a list of node type T to flattened version of node F. |
| * Please note that type T may be nested, and the length of `structuredData` may be different |
| * from that of returned list `F[]`. |
| */ |
| flattenNodes(structuredData) { |
| let resultNodes = []; |
| structuredData.forEach(node => this._flattenNode(node, 0, resultNodes, [])); |
| return resultNodes; |
| } |
| /** |
| * Expand flattened node with current expansion status. |
| * The returned list may have different length. |
| */ |
| expandFlattenedNodes(nodes, treeControl) { |
| let results = []; |
| let currentExpand = []; |
| currentExpand[0] = true; |
| nodes.forEach(node => { |
| let expand = true; |
| for (let i = 0; i <= this.getLevel(node); i++) { |
| expand = expand && currentExpand[i]; |
| } |
| if (expand) { |
| results.push(node); |
| } |
| if (this.isExpandable(node)) { |
| currentExpand[this.getLevel(node) + 1] = treeControl.isExpanded(node); |
| } |
| }); |
| return results; |
| } |
| } |
| /** |
| * Data source for flat tree. |
| * The data source need to handle expansion/collapsion of the tree node and change the data feed |
| * to `MatTree`. |
| * The nested tree nodes of type `T` are flattened through `MatTreeFlattener`, and converted |
| * to type `F` for `MatTree` to consume. |
| */ |
| export class MatTreeFlatDataSource extends DataSource { |
| constructor(_treeControl, _treeFlattener, initialData = []) { |
| super(); |
| this._treeControl = _treeControl; |
| this._treeFlattener = _treeFlattener; |
| this._flattenedData = new BehaviorSubject([]); |
| this._expandedData = new BehaviorSubject([]); |
| this._data = new BehaviorSubject(initialData); |
| } |
| get data() { return this._data.value; } |
| set data(value) { |
| this._data.next(value); |
| this._flattenedData.next(this._treeFlattener.flattenNodes(this.data)); |
| this._treeControl.dataNodes = this._flattenedData.value; |
| } |
| connect(collectionViewer) { |
| const changes = [ |
| collectionViewer.viewChange, |
| this._treeControl.expansionModel.changed, |
| this._flattenedData |
| ]; |
| return merge(...changes).pipe(map(() => { |
| this._expandedData.next(this._treeFlattener.expandFlattenedNodes(this._flattenedData.value, this._treeControl)); |
| return this._expandedData.value; |
| })); |
| } |
| disconnect() { |
| // no op |
| } |
| } |
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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 */\n\nimport {CollectionViewer, DataSource} from '@angular/cdk/collections';\nimport {FlatTreeControl, TreeControl} from '@angular/cdk/tree';\nimport {BehaviorSubject, merge, Observable} from 'rxjs';\nimport {map, take} from 'rxjs/operators';\n\n/**\n * Tree flattener to convert a normal type of node to node with children & level information.\n * Transform nested nodes of type `T` to flattened nodes of type `F`.\n *\n * For example, the input data of type `T` is nested, and contains its children data:\n *   SomeNode: {\n *     key: 'Fruits',\n *     children: [\n *       NodeOne: {\n *         key: 'Apple',\n *       },\n *       NodeTwo: {\n *        key: 'Pear',\n *      }\n *    ]\n *  }\n *  After flattener flatten the tree, the structure will become\n *  SomeNode: {\n *    key: 'Fruits',\n *    expandable: true,\n *    level: 1\n *  },\n *  NodeOne: {\n *    key: 'Apple',\n *    expandable: false,\n *    level: 2\n *  },\n *  NodeTwo: {\n *   key: 'Pear',\n *   expandable: false,\n *   level: 2\n * }\n * and the output flattened type is `F` with additional information.\n */\nexport class MatTreeFlattener<T, F, K = F> {\n\n  constructor(public transformFunction: (node: T, level: number) => F,\n              public getLevel: (node: F) => number,\n              public isExpandable: (node: F) => boolean,\n              public getChildren: (node: T) =>\n                  Observable<T[]> | T[] | undefined | null) {}\n\n  _flattenNode(node: T, level: number,\n               resultNodes: F[], parentMap: boolean[]): F[] {\n    const flatNode = this.transformFunction(node, level);\n    resultNodes.push(flatNode);\n\n    if (this.isExpandable(flatNode)) {\n      const childrenNodes = this.getChildren(node);\n      if (childrenNodes) {\n        if (Array.isArray(childrenNodes)) {\n          this._flattenChildren(childrenNodes, level, resultNodes, parentMap);\n        } else {\n          childrenNodes.pipe(take(1)).subscribe(children => {\n            this._flattenChildren(children, level, resultNodes, parentMap);\n          });\n        }\n      }\n    }\n    return resultNodes;\n  }\n\n  _flattenChildren(children: T[], level: number,\n                   resultNodes: F[], parentMap: boolean[]): void {\n    children.forEach((child, index) => {\n      let childParentMap: boolean[] = parentMap.slice();\n      childParentMap.push(index != children.length - 1);\n      this._flattenNode(child, level + 1, resultNodes, childParentMap);\n    });\n  }\n\n  /**\n   * Flatten a list of node type T to flattened version of node F.\n   * Please note that type T may be nested, and the length of `structuredData` may be different\n   * from that of returned list `F[]`.\n   */\n  flattenNodes(structuredData: T[]): F[] {\n    let resultNodes: F[] = [];\n    structuredData.forEach(node => this._flattenNode(node, 0, resultNodes, []));\n    return resultNodes;\n  }\n\n  /**\n   * Expand flattened node with current expansion status.\n   * The returned list may have different length.\n   */\n  expandFlattenedNodes(nodes: F[], treeControl: TreeControl<F, K>): F[] {\n    let results: F[] = [];\n    let currentExpand: boolean[] = [];\n    currentExpand[0] = true;\n\n    nodes.forEach(node => {\n      let expand = true;\n      for (let i = 0; i <= this.getLevel(node); i++) {\n        expand = expand && currentExpand[i];\n      }\n      if (expand) {\n        results.push(node);\n      }\n      if (this.isExpandable(node)) {\n        currentExpand[this.getLevel(node) + 1] = treeControl.isExpanded(node);\n      }\n    });\n    return results;\n  }\n}\n\n\n/**\n * Data source for flat tree.\n * The data source need to handle expansion/collapsion of the tree node and change the data feed\n * to `MatTree`.\n * The nested tree nodes of type `T` are flattened through `MatTreeFlattener`, and converted\n * to type `F` for `MatTree` to consume.\n */\nexport class MatTreeFlatDataSource<T, F, K = F> extends DataSource<F> {\n  _flattenedData = new BehaviorSubject<F[]>([]);\n\n  _expandedData = new BehaviorSubject<F[]>([]);\n\n  _data: BehaviorSubject<T[]>;\n  get data() { return this._data.value; }\n  set data(value: T[]) {\n    this._data.next(value);\n    this._flattenedData.next(this._treeFlattener.flattenNodes(this.data));\n    this._treeControl.dataNodes = this._flattenedData.value;\n  }\n\n  constructor(private _treeControl: FlatTreeControl<F, K>,\n              private _treeFlattener: MatTreeFlattener<T, F, K>,\n              initialData: T[] = []) {\n    super();\n    this._data = new BehaviorSubject<T[]>(initialData);\n  }\n\n  connect(collectionViewer: CollectionViewer): Observable<F[]> {\n    const changes = [\n      collectionViewer.viewChange,\n      this._treeControl.expansionModel.changed,\n      this._flattenedData\n    ];\n    return merge(...changes).pipe(map(() => {\n      this._expandedData.next(\n        this._treeFlattener.expandFlattenedNodes(this._flattenedData.value, this._treeControl));\n      return this._expandedData.value;\n    }));\n  }\n\n  disconnect() {\n    // no op\n  }\n}\n"]} |