How to use SliverReorderableGrid？

[anjinwang]

Regarding the use of SliverReorderableGrid, can you provide a code demo? I have a problem when I use it, I can’t drag, the code is as follows

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

void main() => runApp(const MyApp());

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

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

class _MyAppState extends State<MyApp> {
  final items = List<int>.generate(40, (index) => index);

  void _onReorder(int oldIndex, int newIndex) {
    setState(() {
      final item = items.removeAt(oldIndex);
      items.insert(newIndex, item);
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
          body: CustomScrollView(
        slivers: [
          SliverReorderableGrid(
              itemCount: items.length,
              itemBuilder: (context, index) => Card(
                    key: ValueKey(index),
                    child: Center(
                      child: Text(index.toString()),
                    ),
                  ),
              gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
                crossAxisCount: 3,
                childAspectRatio: 3 / 5,
                mainAxisSpacing: 10.0,
                crossAxisSpacing: 10.0,
              ),
              onReorder: _onReorder)
        ],
      )),
    );
  }
}

[casvanluijtelaar]

you'll need to wrap your children in a ReorderableGridDragStartListener. You can find more info in the docs.