如果我们在Primeng orderlist中使用drag n drop对元素重新排序，如何获得新的修改后的索引

import { Component } from '@angular/core';

@Component({
  selector: 'app-my-component',
  templateUrl: './my-component.component.html',
  styleUrls: ['./my-component.component.css']
})
export class MyComponent {
  items: any[] = [
    { label: 'Item 1' },
    { label: 'Item 2' },
    { label: 'Item 3' },
    { label: 'Item 4' }
  ];
  newIndex: number;
  
  // 其他代码...
}

<p-orderList [value]="items" dragdrop="true" (onListChange)="updateIndexes($event)">
  <ng-template let-item pTemplate="item">
    <div class="ui-helper-clearfix">
      {{item.label}}
    </div>
  </ng-template>
</p-orderList>

import { Component } from '@angular/core';

@Component({
  selector: 'app-my-component',
  templateUrl: './my-component.component.html',
  styleUrls: ['./my-component.component.css']
})
export class MyComponent {
  items: any[] = [
    { label: 'Item 1' },
    { label: 'Item 2' },
    { label: 'Item 3' },
    { label: 'Item 4' }
  ];
  newIndex: number;
  
  updateIndexes(event: any) {
    this.items = event.list; // 更新排序后的元素数组
    this.newIndex = event.dropIndex; // 获取新的索引
  }
  
  // 其他代码...
}