如何在Flutter中使用PaginatedDataTable中的DataRows列表？

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('PaginatedDataTable Example'),
        ),
        body: MyDataTable(),
      ),
    );
  }
}

class MyDataTable extends StatefulWidget {
  @override
  _MyDataTableState createState() => _MyDataTableState();
}

class _MyDataTableState extends State<MyDataTable> {
  List<DataRow> dataList = [
    DataRow(cells: [
      DataCell(Text('John')),
      DataCell(Text('Doe')),
      DataCell(Text('30')),
    ]),
    DataRow(cells: [
      DataCell(Text('Jane')),
      DataCell(Text('Smith')),
      DataCell(Text('25')),
    ]),
    // Add more data rows here
  ];

  _MyTableDataSource _dataSource = _MyTableDataSource();

  @override
  Widget build(BuildContext context) {
    return PaginatedDataTable(
      header: Text('User Data'),
      columns: [
        DataColumn(label: Text('First Name')),
        DataColumn(label: Text('Last Name')),
        DataColumn(label: Text('Age')),
      ],
      source: _dataSource,
      rowsPerPage: 5,
    );
  }
}

class _MyTableDataSource extends DataTableSource {
  int _selectedRowCount = 0;

  @override
  DataRow getRow(int index) {
    return widget.dataList[index];
  }

  @override
  int get rowCount => widget.dataList.length;

  @override
  bool get isRowCountApproximate => false;

  @override
  int get selectedRowCount => _selectedRowCount;

  void _sort<T>(Comparable<T> getField(DataRow data), bool ascending) {
    widget.dataList.sort((DataRow a, DataRow b) {
      final Comparable<T> aValue = getField(a);
      final Comparable<T> bValue = getField(b);
      return ascending ? Comparable.compare(aValue, bValue) : Comparable.compare(bValue, aValue);
    });
    notifyListeners();
  }
}