dragging an item down and without releasing return it to its original position
Expected results
The item should return to its original position without a jump. with smooth animation
see video below
Actual results
Since when returning to the original position the newIndex is not equal to the start index, it equals startIndex + 1, which leads to a jump in the animation.
Code sample
```dart
import 'package:flutter/material.dart';
/// Flutter code sample for [ReorderableListView].
void main() => runApp(const ReorderableApp());
class ReorderableApp extends StatelessWidget {
const ReorderableApp({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 createState() => _ReorderableListViewExampleState();
}
class _ReorderableListViewExampleState extends State {
final List _items = List.generate(50, (int index) => index);
@override
Widget build(BuildContext context) {
final ColorScheme colorScheme = Theme.of(context).colorScheme;
final Color oddItemColor = colorScheme.primary.withOpacity(0.05);
final Color evenItemColor = colorScheme.primary.withOpacity(0.15);
return ReorderableListView(
padding: const EdgeInsets.symmetric(horizontal: 40),
children: [
for (int index = 0; index < _items.length; index += 1)
ListTile(
key: Key('$index'),
tileColor: _items[index].isOdd ? oddItemColor : evenItemColor,
title: Text('Item ${_items[index]}'),
),
],
onReorder: (int oldIndex, int newIndex) {
setState(() {
if (oldIndex < newIndex) {
newIndex -= 1;
}
final int item = _items.removeAt(oldIndex);
_items.insert(newIndex, item);
});
},
);
}
}
```
Screenshots or Video
Screenshots / Video demonstration
Actual result
https://github.com/flutter/flutter/assets/23139753/aa24a740-5552-4e8d-9fbe-ef596ee28987
Expected
https://github.com/flutter/flutter/assets/23139753/c768b4e7-6efc-4d6b-b55f-e7c3e5dc1b25
Logs
Logs
```console
[Paste your logs here]
```
Flutter Doctor output
Doctor output
```console
[✓] Flutter (Channel stable, 3.22.2, on macOS 14.5 23F79 darwin-arm64, locale ru-UZ)
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 15.4)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2023.2)
[✓] VS Code (version 1.90.0)
[✓] Connected device (5 available)
[✓] Network resources
```
Thanks for the report. I was able to replicate the reported behavior in latest versions.
stable, master flutter doctor -v
```
[!] Flutter (Channel stable, 3.22.2, on macOS 12.2.1 21D62 darwin-x64, locale
en-GB)
• Flutter version 3.22.2 on channel stable at
/Users/dhs/documents/fluttersdk/flutter
! Warning: `flutter` on your path resolves to
/Users/dhs/Documents/Fluttersdk/flutter/bin/flutter, which is not inside
your current Flutter SDK checkout at
/Users/dhs/documents/fluttersdk/flutter. Consider adding
/Users/dhs/documents/fluttersdk/flutter/bin to the front of your path.
! Warning: `dart` on your path resolves to
/Users/dhs/Documents/Fluttersdk/flutter/bin/dart, which is not inside your
current Flutter SDK checkout at /Users/dhs/documents/fluttersdk/flutter.
Consider adding /Users/dhs/documents/fluttersdk/flutter/bin to the front
of your path.
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 761747bfc5 (33 hours ago), 2024-06-05 22:15:13 +0200
• Engine revision edd8546116
• Dart version 3.4.3
• DevTools version 2.34.3
• If those were intentional, you can disregard the above warnings; however
it is recommended to use "git" directly to perform update checks and
upgrades.
[!] Xcode - develop for iOS and macOS (Xcode 12.3)
• Xcode at /Applications/Xcode.app/Contents/Developer
! Flutter recommends a minimum Xcode version of 13.
Download the latest version or update via the Mac App Store.
• CocoaPods version 1.11.2
[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] VS Code (version 1.62.0)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.21.0
[✓] Connected device (5 available)
• SM G975F (mobile) • RZ8M802WY0X • android-arm64 • Android 11 (API 30)
• Darshan's iphone (mobile) • 21150b119064aecc249dfcfe05e259197461ce23 •
ios • iOS 14.4.1 18D61
• iPhone 12 Pro Max (mobile) • A5473606-0213-4FD8-BA16-553433949729 •
ios • com.apple.CoreSimulator.SimRuntime.iOS-14-3 (simulator)
• macOS (desktop) • macos •
darwin-x64 • Mac OS X 10.15.4 19E2269 darwin-x64
• Chrome (web) • chrome •
web-javascript • Google Chrome 98.0.4758.80
[✓] HTTP Host Availability
• All required HTTP hosts are available
! Doctor found issues in 1 category.
[!] Flutter (Channel master, 3.23.0-13.0.pre.278, on macOS 12.2.1 21D62
darwin-x64, locale en-GB)
• Flutter version 3.23.0-13.0.pre.278 on channel master at
/Users/dhs/documents/fluttersdk/flutter
! Warning: `flutter` on your path resolves to
/Users/dhs/Documents/Fluttersdk/flutter/bin/flutter, which is not inside
your current Flutter SDK checkout at
/Users/dhs/documents/fluttersdk/flutter. Consider adding
/Users/dhs/documents/fluttersdk/flutter/bin to the front of your path.
! Warning: `dart` on your path resolves to
/Users/dhs/Documents/Fluttersdk/flutter/bin/dart, which is not inside your
current Flutter SDK checkout at /Users/dhs/documents/fluttersdk/flutter.
Consider adding /Users/dhs/documents/fluttersdk/flutter/bin to the front
of your path.
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision c631d0855b (4 hours ago), 2024-06-19 20:29:41 -0400
• Engine revision f9c497f178
• Dart version 3.5.0 (build 3.5.0-281.0.dev)
• DevTools version 2.36.0
• If those were intentional, you can disregard the above warnings; however
it is recommended to use "git" directly to perform update checks and
upgrades.
[!] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
• Android SDK at /Users/dhs/Library/Android/sdk
✗ cmdline-tools component is missing
Run `path/to/sdkmanager --install "cmdline-tools;latest"`
See https://developer.android.com/studio/command-line for more details.
✗ Android license status unknown.
Run `flutter doctor --android-licenses` to accept the SDK licenses.
See https://flutter.dev/docs/get-started/install/macos#android-setup for
more details.
[✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 13C100
• CocoaPods version 1.11.2
[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] IntelliJ IDEA Ultimate Edition (version 2021.3.2)
• IntelliJ at /Applications/IntelliJ IDEA.app
• Flutter plugin version 65.1.4
• Dart plugin version 213.7228
[✓] VS Code (version 1.62.0)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.29.0
[✓] Connected device (3 available)
• Darshan's iphone (mobile) • 21150b119064aecc249dfcfe05e259197461ce23 • ios
• iOS 15.3.1 19D52
• macOS (desktop) • macos •
darwin-x64 • macOS 12.2.1 21D62 darwin-x64
• Chrome (web) • chrome •
web-javascript • Google Chrome 109.0.5414.119
[✓] Network resources
• All expected network resources are available.
! Doctor found issues in 1 category.
[!] Xcode - develop for iOS and macOS (Xcode 12.3)
• Xcode at /Applications/Xcode.app/Contents/Developer
! Flutter recommends a minimum Xcode version of 13.
Download the latest version or update via the Mac App Store.
• CocoaPods version 1.11.2
[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] VS Code (version 1.62.0)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.21.0
[✓] Connected device (5 available)
• SM G975F (mobile) • RZ8M802WY0X • android-arm64 • Android 11 (API 30)
• Darshan's iphone (mobile) • 21150b119064aecc249dfcfe05e259197461ce23 •
ios • iOS 14.4.1 18D61
• iPhone 12 Pro Max (mobile) • A5473606-0213-4FD8-BA16-553433949729 •
ios • com.apple.CoreSimulator.SimRuntime.iOS-14-3 (simulator)
• macOS (desktop) • macos •
darwin-x64 • Mac OS X 10.15.4 19E2269 darwin-x64
• Chrome (web) • chrome •
web-javascript • Google Chrome 98.0.4758.80
[✓] HTTP Host Availability
• All required HTTP hosts are available
! Doctor found issues in 1 category.
```
Steps to reproduce
dragging an item down and without releasing return it to its original position
Expected results
The item should return to its original position without a jump. with smooth animation see video below
Actual results
Since when returning to the original position the newIndex is not equal to the start index, it equals startIndex + 1, which leads to a jump in the animation.
Code sample
code sample from https://api.flutter.dev/flutter/material/ReorderableListView-class.html
Code sample
```dart import 'package:flutter/material.dart'; /// Flutter code sample for [ReorderableListView]. void main() => runApp(const ReorderableApp()); class ReorderableApp extends StatelessWidget { const ReorderableApp({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 StateScreenshots or Video
Screenshots / Video demonstration
Actual result https://github.com/flutter/flutter/assets/23139753/aa24a740-5552-4e8d-9fbe-ef596ee28987 Expected https://github.com/flutter/flutter/assets/23139753/c768b4e7-6efc-4d6b-b55f-e7c3e5dc1b25Logs
Logs
```console [Paste your logs here] ```Flutter Doctor output
Doctor output
```console [✓] Flutter (Channel stable, 3.22.2, on macOS 14.5 23F79 darwin-arm64, locale ru-UZ) [✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0) [✓] Xcode - develop for iOS and macOS (Xcode 15.4) [✓] Chrome - develop for the web [✓] Android Studio (version 2023.2) [✓] VS Code (version 1.90.0) [✓] Connected device (5 available) [✓] Network resources ```