@angular/material
Version:
Angular Material
148 lines • 17 kB
JavaScript
/**
* @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 {
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;
}
constructor(_treeControl, _treeFlattener, initialData) {
super();
this._treeControl = _treeControl;
this._treeFlattener = _treeFlattener;
this._flattenedData = new BehaviorSubject([]);
this._expandedData = new BehaviorSubject([]);
this._data = new BehaviorSubject([]);
if (initialData) {
// Assign the data through the constructor to ensure that all of the logic is executed.
this.data = initialData;
}
}
connect(collectionViewer) {
return merge(collectionViewer.viewChange, this._treeControl.expansionModel.changed, this._flattenedData).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  constructor(\n    public transformFunction: (node: T, level: number) => F,\n    public getLevel: (node: F) => number,\n    public isExpandable: (node: F) => boolean,\n    public getChildren: (node: T) => Observable<T[]> | T[] | undefined | null,\n  ) {}\n\n  _flattenNode(node: T, level: number, 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, 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 * 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  private readonly _flattenedData = new BehaviorSubject<F[]>([]);\n  private readonly _expandedData = new BehaviorSubject<F[]>([]);\n\n  get data() {\n    return this._data.value;\n  }\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  private readonly _data = new BehaviorSubject<T[]>([]);\n\n  constructor(\n    private _treeControl: FlatTreeControl<F, K>,\n    private _treeFlattener: MatTreeFlattener<T, F, K>,\n    initialData?: T[],\n  ) {\n    super();\n\n    if (initialData) {\n      // Assign the data through the constructor to ensure that all of the logic is executed.\n      this.data = initialData;\n    }\n  }\n\n  connect(collectionViewer: CollectionViewer): Observable<F[]> {\n    return merge(\n      collectionViewer.viewChange,\n      this._treeControl.expansionModel.changed,\n      this._flattenedData,\n    ).pipe(\n      map(() => {\n        this._expandedData.next(\n          this._treeFlattener.expandFlattenedNodes(this._flattenedData.value, this._treeControl),\n        );\n        return this._expandedData.value;\n      }),\n    );\n  }\n\n  disconnect() {\n    // no op\n  }\n}\n"]}