要在AG-Grid-Angular中实现此功能，您可以遵循以下步骤：

1. 在头部组件中创建一个复选框，用于检查/取消所有单元格渲染器中的复选框。

header.component.html:

2. 在头部组件的对应TypeScript文件中，创建一个selectAllChecked变量，并在ngOnInit函数中初始化为false。

header.component.ts:

import { Component, OnInit } from '@angular/core';
import { GridOptions } from 'ag-grid-community';

@Component({
  selector: 'app-header',
  templateUrl: './header.component.html',
  styleUrls: ['./header.component.css']
})
export class HeaderComponent implements OnInit {
  selectAllChecked = false;

  constructor() { }

  ngOnInit(): void {
  }

  selectAllRows() {
    // 获取GridOptions对象
    const gridOptions: GridOptions = this.gridOptions;

    // 获取单元格渲染器中的复选框元素
    const checkboxElements = document.querySelectorAll('.checkbox-cell');

    // 检查/取消所有单元格渲染器中的复选框
    checkboxElements.forEach((checkbox: HTMLInputElement) => {
      checkbox.checked = this.selectAllChecked;
      const rowIndex = checkbox.getAttribute('data-row-index');
      gridOptions.api.getRowNode(rowIndex).setDataValue('selected', this.selectAllChecked);
    });
  }
}

3. 在单元格渲染器中，创建一个复选框并将其与单元格数据绑定。

checkbox-cell-renderer.component.html:

4. 在单元格渲染器的对应TypeScript文件中，创建一个onCheckboxChanged函数，以在复选框状态更改时更新单元格数据。

checkbox-cell-renderer.component.ts:

import { Component } from '@angular/core';
import { ICellRendererAngularComp } from 'ag-grid-angular';

@Component({
  selector: 'app-checkbox-cell-renderer',
  templateUrl: './checkbox-cell-renderer.component.html',
  styleUrls: ['./checkbox-cell-renderer.component.css']
})
export class CheckboxCellRendererComponent implements ICellRendererAngularComp {
  params: any;

  constructor() { }

  agInit(params: any): void {
    this.params = params;
  }

  refresh(params: any): boolean {
    return true;
  }

  onCheckboxChanged(event: any) {
    const selected = event.target.checked;
    this.params.data.selected = selected;
  }
}

5. 在AG-Grid中使用复选框头部组件和单元格渲染器。

app.component.html:

app.component.ts:

import { Component } from '@angular/core';
import { CheckboxCellRendererComponent } from './checkbox-cell-renderer/checkbox-cell-renderer.component';
import { HeaderComponent } from './header/header.component';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  gridOptions: any;

  constructor() {
    this.gridOptions = {
      columnDefs: [
        {
          headerName: '',
          field: 'selected',
          cellRendererFramework: CheckboxCellRendererComponent,
          sortable: false,
          width: 80,
          checkboxSelection: true
        },
        { headerName: 'Name', field: 'name' },
        { headerName: 'Age', field: 'age' },
        { headerName: 'Address', field: 'address' }
      ],
      rowData: [
        { name: 'John', age: 25, address: 'New York', selected: false },
        { name: 'Mary', age: 30, address: 'London', selected: false },
        { name: 'Tom', age: 35, address: 'Paris', selected: false }
      ],
      frameworkComponents: {
        headerComponent: HeaderComponent
      },
      onGridReady: (params: any) => {
        params.api.sizeColumnsToFit();
      }
    };
  }
}

这样，当您在头部组件中的复选框中选择