If you use the handle to change the order of an item, drop the handle then quickly try to move another handle, you get an error like update() called on null at line: (package:flutter_reorderable_list/flutter_reorderable_list.dart:243:17)

I/flutter (32332): ══╡ EXCEPTION CAUGHT BY GESTURE ╞═══════════════════════════════════════════════════════════════════ I/flutter (32332): The following NoSuchMethodError was thrown while handling a gesture: I/flutter (32332): The method 'update' was called on null. I/flutter (32332): Receiver: null I/flutter (32332): Tried calling: update() I/flutter (32332): I/flutter (32332): When the exception was thrown, this was the stack: I/flutter (32332): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:50:5) I/flutter (32332): #1 _ReorderableListState._dragStart (package:flutter_reorderable_list/flutter_reorderable_list.dart:243:17) I/flutter (32332): #2 MultiDragGestureRecognizer._startDrag. (package:flutter/src/gestures/multidrag.dart:266:52) I/flutter (32332): #3 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24) I/flutter (32332): #4 MultiDragGestureRecognizer._startDrag (package:flutter/src/gestures/multidrag.dart:266:14) I/flutter (32332): #5 MultiDragGestureRecognizer.acceptGesture. (package:flutter/src/gestures/multidrag.dart:256:48) I/flutter (32332): #6 _VerticalPointerState.accepted (package:flutter_reorderable_list/flutter_reorderable_list.dart:736:12) I/flutter (32332): #7 MultiDragGestureRecognizer.acceptGesture (package:flutter/src/gestures/multidrag.dart:256:11) I/flutter (32332): #8 GestureArenaManager._resolveInFavorOf (package:flutter/src/gestures/arena.dart:263:12) I/flutter (32332): #9 GestureArenaManager._resolve (package:flutter/src/gestures/arena.dart:222:9) I/flutter (32332): #10 GestureArenaEntry.resolve (package:flutter/src/gestures/arena.dart:52:12) I/flutter (32332): #11 MultiDragPointerState.resolve (package:flutter/src/gestures/multidrag.dart:62:17) I/flutter (32332): #12 _VerticalPointerState.checkForResolutionAfterMove (package:flutter_reorderable_list/flutter_reorderable_list.dart:731:7) I/flutter (32332): #13 MultiDragPointerState._move (package:flutter/src/gestures/multidrag.dart:81:7) I/flutter (32332): #14 MultiDragGestureRecognizer._handleEvent (package:flutter/src/gestures/multidrag.dart:230:13) I/flutter (32332): #15 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:75:13) I/flutter (32332): #16 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:102:11) I/flutter (32332): #17 _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:218:19) I/flutter (32332): #18 _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:198:22) I/flutter (32332): #19 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:156:7) I/flutter (32332): #20 _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:102:7) I/flutter (32332): #21 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:86:7) I/flutter (32332): #25 _invoke1 (dart:ui/hooks.dart:250:10) I/flutter (32332): #26 _dispatchPointerDataPacket (dart:ui/hooks.dart:159:5) I/flutter (32332): (elided 3 frames from package dart:async) I/flutter (32332): I/flutter (32332): Handler: "onStart" I/flutter (32332): Recognizer: I/flutter (32332): _Recognizer#1b65b I/flutter (32332): ════════════════════════════════════════════════════════════════════════════════════════════════════

After that you can't move any of the handles anymore. It gets broken. Try around a few times then you will see. I use ListTiles.

Hi Matej, Thanks for this, been using it for a while now without any problems - more than a proof of concept, it's great! Fluid too!

I want to write the reordered items to a backend. At the moment I am doing it async in the onReorder callback which is not ideal because it's called for each position change. i.e. while dragging. Would prefer to do on drag complete, i.e. when the user releases the drag and the item is in the final position.

An onReorderComplete or onDragComplete callback might be useful.

Hello.

I didn't find any options to customize decorations. So I added an option to remove shadows while dragging as it was my requirement.

Thank you for this cool library!

I got error after runing flutter build apk

Please support for MediaQuery.maybeOf Flutter API breaking change.

../flutter_sdk/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_reorderable_list-0.1.5/lib/flutter_reorderable_list.dart:315:49: Error: No named parameter with the name 'nullOk'.
      MediaQueryData d = MediaQuery.of(context, nullOk: true);          
                                                ^^^^^^                  
../flutter_sdk/flutter/packages/flutter/lib/src/widgets/media_query.dart:814:25: Context: Found this candidate, but the arguments don't match.
  static MediaQueryData of(BuildContext context) {                      
                        ^^                                              
                                                                        
                                                                        
FAILURE: Build failed with an exception.                                
                                                                        
* Where:                                                                
Script '/Users/nickchen/Documents/flutter_sdk/flutter/packages/flutter_tools/gradle/flutter.gradle' line: 900
                                                                        
* What went wrong:                                                      
Execution failed for task ':app:compileFlutterBuildRelease'.            
> Process 'command '/Users/nickchen/Documents/flutter_sdk/flutter/bin/flutter'' finished with non-zero exit value 1

Do you support future?

stack_trace_mapper.js:265 Uncaught Bad state: Source maps are not done loading.
    at Object.a (http://localhost:3333/stack_trace_mapper.js:265:3)
    at cA.kg (http://localhost:3333/stack_trace_mapper.js:2723:23)
    at Object.iN (http://localhost:3333/stack_trace_mapper.js:220:69)
    at jA (http://localhost:3333/stack_trace_mapper.js:2442:10)
    at http://localhost:3333/stack_trace_mapper.js:2436:42
    at dart._StackTrace.new.toString (http://localhost:3333/dart_sdk.js:7060:19)
    at Object._toString [as toString] (http://localhost:3333/dart_sdk.js:4887:26)

When I change Item class from StatelessWidget to StatefulWidget, it does not work properly. A weird situation occurs in ui. New form of Item class:

class Item extends StatefulWidget {
  Item({
    this.data,
    this.isFirst,
    this.isLast,
    this.draggingMode,
  });

  final ItemData data;
  final bool isFirst;
  final bool isLast;
  final DraggingMode draggingMode;

@override
  State<StatefulWidget> createState() => new _ItemState(data: data, isFirst: isFirst, isLast: isLast, draggingMode: draggingMode);
}

class _ItemState extends State<Item> {
  _ItemState({
    this.data,
    this.isFirst,
    this.isLast,
    this.draggingMode,
  });

  final ItemData data;
  final bool isFirst;
  final bool isLast;
  final DraggingMode draggingMode;

Hello there !

Thanks for the package 😁 I upgraded my Flutter installation on v2.8.0 that was just released a few hours ago. Here is a PR that will fix every warnings/errors reported on this new version.

The analysis tab shows

Package not compatible with runtime flutter-web on web

Because:

• package:flutter_reorderable_list/flutter_reorderable_list.dart that imports:
• dart:io

yet the example seems to run fine on web.

Can someone confirm if this works with flutter-web?

So my list have 2 section: pinned and regular. All pinned items is on the beginning of the list, the regular item is the rest. I would like when user drag the pinned item, the pinned item can not move out of the pinned section. It is the same with the regular section.

Hello!

I am trying to create some sort of task manager exactly like in trello and your library solving my problem of drag&droping perfectly, but now fully. Can you please make possivle to drag&drop item of list between two and more lists.

Would ListTile be incompatible with ReorderableList?

I'm trying to place a ReorderableListener in the trailing widget of a ListTile and having problems (the ListTile layout gets messy).

Is it me, or would that be expected?

Before this change:

https://user-images.githubusercontent.com/1255062/169477832-6d1aabe2-b7dd-4148-8a5e-635f2a7e9048.mov

After this change:

https://user-images.githubusercontent.com/1255062/169477759-615ccc0a-dc62-4756-85f3-73729e78904e.mov

I am using FVM to run the project in differents version but in the differents version i tried to run it, i get an error : Error: Type 'DeviceGestureSettings' not found. package:flutter_reorderable_list/flutter_reorderable_list.dart:739 DeviceGestureSettings? gestureSettings) ^^^^^^^^^^^^^^^^^^^^^ Any idea why am i getting this error? Thank you.

Ok when i use flutter 2.8.1 it works but what happen if i want to use flutter 2.10.5 ? it does not work.

When I try to build using Flutter 2.6.0+, I get this error:

Error: Too few positional arguments: 3 required, 2 given.
../…/lib/flutter_reorderable_list.dart:740
      : super(initialPosition, kind) {
             ^

FAILURE: Build failed with an exception.

Logs:-

ReorderableListener._startDragging (flutter_reorderable_list.dart:147) ReorderableListener._routePointer (flutter_reorderable_list.dart:125) ReorderableListener.build. (flutter_reorderable_list.dart:118) RenderPointerListener.handleEvent (proxy_box.dart:2829) GestureBinding.dispatchEvent (binding.dart:419) RendererBinding.dispatchEvent (binding.dart:287) GestureBinding._handlePointerEventImmediately (binding.dart:374) GestureBinding.handlePointerEvent (binding.dart:338) GestureBinding._flushPointerEventQueue (binding.dart:296) GestureBinding._handlePointerDataPacket (binding.dart:279) ._rootRunUnary (zone.dart:1370) _CustomZone.runUnary (zone.dart:1265) _CustomZone.runUnaryGuarded (zone.dart:1170) ._invoke1 (hooks.dart:182) PlatformDispatcher._dispatchPointerDataPacket (platform_dispatcher.dart:282) ._dispatchPointerDataPacket (hooks.dart:96)