Flutter DataTable 字段排序功能

import 'package:flutter/material.dart';
import 'dart:math';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Kindacode.com',
      home: HomePage(),
    );
  }
}

class HomePage extends StatefulWidget {
  const HomePage({Key? key}) : super(key: key);

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  // Generate a list of fiction prodcts
  final List<Map> _products = List.generate(30, (i) {
    return {"id": i, "name": "Product $i", "price": Random().nextInt(200) + 1};
  });

  int _currentSortColumn = 0;
  bool _isAscending = true;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: const Text('Kindacode.com'),
        ),
        body: SizedBox(
          width: double.infinity,
          child: SingleChildScrollView(
            child: DataTable(
              sortColumnIndex: _currentSortColumn,
              sortAscending: _isAscending,
              headingRowColor: MaterialStateProperty.all(Colors.amber[200]),
              columns: [
                const DataColumn(label: Text('Id')),
                const DataColumn(label: Text('Name')),
                DataColumn(
                    label: const Text(
                      'Price',
                      style: TextStyle(
                          color: Colors.blue, fontWeight: FontWeight.bold),
                    ),
                    // Sorting function
                    onSort: (columnIndex, _) {
                      setState(() {
                        _currentSortColumn = columnIndex;
                        if (_isAscending == true) {
                          _isAscending = false;
                          // sort the product list in Ascending, order by Price
                          _products.sort((productA, productB) =>
                              productB['price'].compareTo(productA['price']));
                        } else {
                          _isAscending = true;
                          // sort the product list in Descending, order by Price
                          _products.sort((productA, productB) =>
                              productA['price'].compareTo(productB['price']));
                        }
                      });
                    }),
              ],
              rows: _products.map((item) {
                return DataRow(cells: [
                  DataCell(Text(item['id'].toString())),
                  DataCell(Text(item['name'])),
                  DataCell(Text(item['price'].toString()))
                ]);
              }).toList(),
            ),
          ),
        ));
  }
}