使用真实示例的角度材料树复选框

要使用真实示例的角度材料树复选框，您需要执行以下步骤：

1. 首先，确保您已经安装了Angular和Angular Material。您可以使用以下命令在您的项目中安装它们：

npm install @angular/cli
ng new my-app
cd my-app
ng add @angular/material

2. 创建一个新的组件，例如tree-checkbox.component.ts：

import { Component } from '@angular/core';
import { SelectionModel } from '@angular/cdk/collections';
import { FlatTreeControl } from '@angular/cdk/tree';
import { MatTreeFlatDataSource, MatTreeFlattener } from '@angular/material/tree';

interface TreeNode {
  name: string;
  children?: TreeNode[];
}

interface FlatTreeNode {
  name: string;
  level: number;
  expandable: boolean;
}

@Component({
  selector: 'app-tree-checkbox',
  templateUrl: './tree-checkbox.component.html',
  styleUrls: ['./tree-checkbox.component.css']
})
export class TreeCheckboxComponent {
  treeControl: FlatTreeControl<FlatTreeNode>;
  treeFlattener: MatTreeFlattener<TreeNode, FlatTreeNode>;
  dataSource: MatTreeFlatDataSource<TreeNode, FlatTreeNode>;
  selection: SelectionModel<FlatTreeNode>;

  constructor() {
    this.treeFlattener = new MatTreeFlattener(this.transformer, node => node.level, node => node.expandable, node => node.children);
    this.treeControl = new FlatTreeControl<FlatTreeNode>(node => node.level, node => node.expandable);
    this.dataSource = new MatTreeFlatDataSource(this.treeControl, this.treeFlattener);
    this.selection = new SelectionModel<FlatTreeNode>(true);
    this.dataSource.data = this.buildTree();
  }

  transformer = (node: TreeNode, level: number) => {
    return {
      name: node.name,
      level: level,
      expandable: !!node.children
    };
  }

  hasChild = (_: number, node: FlatTreeNode) => {
    return node.expandable;
  }

  buildTree(): TreeNode[] {
    return [
      {
        name: 'Parent 1',
        children: [
          { name: 'Child 1' },
          { name: 'Child 2' },
          { name: 'Child 3' }
        ]
      },
      {
        name: 'Parent 2',
        children: [
          {
            name: 'Child 4',
            children: [
              { name: 'Grandchild 1' },
              { name: 'Grandchild 2' }
            ]
          },
          { name: 'Child 5' }
        ]
      }
    ];
  }

  getLevel = (node: FlatTreeNode) => {
    return node.level;
  }

  isExpandable = (node: FlatTreeNode) => {
    return node.expandable;
  }

  toggleNode(node: FlatTreeNode) {
    this.treeControl.toggle(node);
  }

  isSelected(node: FlatTreeNode) {
    return this.selection.isSelected(node);
  }

  toggleSelection(node: FlatTreeNode) {
    this.selection.toggle(node);
  }
}

3. 创建一个HTML模板文件tree-checkbox.component.html：

<mat-tree [dataSource]="dataSource" [treeControl]="treeControl">
  <mat-tree-node *matTreeNodeDef="let node" matTreeNodeToggle>
    <li>
      <button mat-icon-button disabled></button>
      <mat-checkbox [checked]="isSelected(node)" (click)="toggleSelection(node)"></mat-checkbox>
      {{node.name}}
    </li>
  </mat-tree-node>

  <mat-nested-tree-node *matTreeNodeDef="let node; when: isExpandable">
    <li>
      <button mat-icon-button matTreeNodeToggle>
        <mat-icon>{{treeControl.isExpanded(node) ? 'expand_more' : 'chevron_right'}}</mat-icon>
      </button>
      <mat-checkbox [checked]="isSelected(node)" (click)="toggleSelection(node)"></mat-checkbox>
      {{node.name}}
      <ul [class.example-tree-invisible]="!treeControl.isExpanded(node)">
        <ng-container matTreeNodeOutlet></ng-container>
      </ul>
    </li>
  </mat-nested-tree-node>
</mat-tree>

4. 创建一个CSS样式文件tree-checkbox.component.css：

.example-tree-invisible {
  display: none;
}

5. 最后，在您的模块文件中引入和声明TreeCheckboxComponent：

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms