Reorderable ListView in Flutter

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

 void main()
 {
  runApp(HomeScreen());
 }
 class HomeScreen extends StatelessWidget {
  const HomeScreen({super.key});
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('ReorderableListView Sample')),
        body: const ReorderableExample(),
       ),
     );
   }
 }

 class ReorderableExample extends StatefulWidget {
   const ReorderableExample({super.key});

   @override
   State<ReorderableExample> createState() => _ReorderableExampleState();
 }

 class _ReorderableExampleState extends State<ReorderableExample> {
  final List<int> _items = List<int>.generate(50, (int index) => index);

  @override
  Widget build(BuildContext context) {
    final ColorScheme colorScheme = Theme.of(context).colorScheme;
    final Color oddItemColor = colorScheme.secondary.withOpacity(0.05);
    final Color evenItemColor = colorScheme.secondary.withOpacity(0.15);
    final Color draggableItemColor = colorScheme.secondary;

    Widget proxyDecorator(
        Widget child, int index, Animation<double> animation) {
      return AnimatedBuilder(
        animation: animation,
        builder: (BuildContext context, Widget? child) {
          final double animValue = Curves.easeInOut.transform(animation.value);
          final double elevation = lerpDouble(0, 6, animValue)!;
          return Material(
            elevation: elevation,
            color: draggableItemColor,
            shadowColor: draggableItemColor,
            child: child,
          );
        },
        child: child,
      );
    }

    return ReorderableListView(
      padding: const EdgeInsets.symmetric(horizontal: 40),
      children: <Widget>[
        for (int index = 0; index < _items.length; index += 1)
          ListTile(
            key: Key('$index'),
            tileColor: _items[index].isOdd ? oddItemColor : evenItemColor,
            title: Text('Item ${_items[index]}'),
            trailing: ReorderableDragStartListener(
              key: ValueKey<int>(_items[index]),
              index: index,
              child: const Icon(Icons.drag_handle),
            ),
          ),
      ],
      onReorder: (int oldIndex, int newIndex) {
        setState(() {
          if (oldIndex < newIndex) {
            newIndex -= 1;
          }
          final int item = _items.removeAt(oldIndex);
          _items.insert(newIndex, item);
         });
       },
     );
   }
 }