ng-zorro-antd
Version:
An enterprise-class UI components based on Ant Design and Angular
105 lines • 14.2 kB
JavaScript
/**
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE
*/
import { DataSource } from '@angular/cdk/collections';
import { BehaviorSubject, merge } from 'rxjs';
import { map, take } from 'rxjs/operators';
export class NzTreeFlattener {
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) => {
const 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) {
const 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) {
const results = [];
const 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;
}
}
export class NzTreeFlatDataSource 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);
this.flatNodes();
}
setData(value) {
this._data.next(value);
this.flatNodes();
}
getData() {
return this._data.getValue();
}
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
}
flatNodes() {
this._flattenedData.next(this._treeFlattener.flattenNodes(this.getData()));
this._treeControl.dataNodes = this._flattenedData.value;
}
}
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* Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/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\nexport class NzTreeFlattener<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  private 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  private flattenChildren(children: T[], level: number, resultNodes: F[], parentMap: boolean[]): void {\n    children.forEach((child, index) => {\n      const 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    const 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    const results: F[] = [];\n    const 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\nexport class NzTreeFlatDataSource<T, F, K = F> extends DataSource<F> {\n  _flattenedData = new BehaviorSubject<F[]>([]);\n\n  _expandedData = new BehaviorSubject<F[]>([]);\n\n  _data: BehaviorSubject<T[]>;\n\n  constructor(private _treeControl: FlatTreeControl<F, K>, private _treeFlattener: NzTreeFlattener<T, F, K>, initialData: T[] = []) {\n    super();\n    this._data = new BehaviorSubject<T[]>(initialData);\n    this.flatNodes();\n  }\n\n  setData(value: T[]): void {\n    this._data.next(value);\n    this.flatNodes();\n  }\n\n  getData(): T[] {\n    return this._data.getValue();\n  }\n\n  connect(collectionViewer: CollectionViewer): Observable<F[]> {\n    const changes = [collectionViewer.viewChange, this._treeControl.expansionModel.changed, this._flattenedData];\n    return merge(...changes).pipe(\n      map(() => {\n        this._expandedData.next(this._treeFlattener.expandFlattenedNodes(this._flattenedData.value, this._treeControl));\n        return this._expandedData.value;\n      })\n    );\n  }\n\n  disconnect(): void {\n    // no op\n  }\n\n  private flatNodes(): void {\n    this._flattenedData.next(this._treeFlattener.flattenNodes(this.getData()));\n    this._treeControl.dataNodes = this._flattenedData.value;\n  }\n}\n"]}