一个Flutter GridView，用户可以通过拖动来交互地重新排序其项目

import 'package:flutter_reorderable_grid_view/reorderable_grid_view.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.grey,
      body: SafeArea(
        child: Padding(
          padding: const EdgeInsets.all(20),
          child: ReorderableGridView(
            children: List.generate(
              20,
                  (index) => Container(
                color: Colors.blue,
                height: 100,
                width: 100,
                child: Text(
                  'test $index',
                  style: const TextStyle(
                    fontSize: 20,
                    color: Colors.white,
                  ),
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }
}