DropdownMenu throws exception when it is in any scrollable list view and scrolls quickly #139871
Description
Steps to reproduce
- Create new flutter project with flutter cli
- Edit the body of scaffold with:
ListView.builder(
itemBuilder: (context, index) {
return DropdownMenu(dropdownMenuEntries: []);
},
)- run the project
- scroll quickly
Expected results
There shouldn't be any exceptions
Actual results
macos
setState() called after dispose(): _DropdownMenuState<Object?>#bc5c7(lifecycle state: defunct, not mounted)
web (chrome)
setState() called after dispose(): _DropdownMenuState<Object?>#7f4e3(lifecycle state: defunct, not mounted)
ios simulator is correct
Code sample
Code sample
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
useMaterial3: true,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({super.key, required this.title});
final String title;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
title: Text(widget.title),
),
body: ListView.builder(
itemBuilder: (context, index) {
return DropdownMenu(dropdownMenuEntries: []);
},
),
);
}
}Logs
Logs
macos
======== Exception caught by scheduler library =====================================================
The following assertion was thrown during a scheduler callback:
setState() called after dispose(): _DropdownMenuState<Object?>#bc5c7(lifecycle state: defunct, not mounted)
This error happens if you call setState() on a State object for a widget that no longer appears in the widget tree (e.g., whose parent widget no longer includes the widget in its build). This error can occur when code calls setState() from a timer or an animation callback.
The preferred solution is to cancel the timer or stop listening to the animation in the dispose() callback. Another solution is to check the "mounted" property of this object before calling setState() to ensure the object is still in the tree.
This error might indicate a memory leak if setState() is being called because another object is retaining a reference to this State object after it has been removed from the tree. To avoid memory leaks, consider breaking the reference to this object during dispose().
When the exception was thrown, this was the stack:
#0 State.setState.<anonymous closure> (package:flutter/src/widgets/framework.dart:1167:9)
#1 State.setState (package:flutter/src/widgets/framework.dart:1202:6)
#2 _DropdownMenuState.refreshLeadingPadding.<anonymous closure> (package:flutter/src/material/dropdown_menu.dart:387:7)
#3 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1325:15)
#4 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1264:9)
#5 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1113:5)
#6 _invoke (dart:ui/hooks.dart:312:13)
#7 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:383:5)
#8 _drawFrame (dart:ui/hooks.dart:283:31)
====================================================================================================web (chrome)
======== Exception caught by scheduler library =====================================================
The following assertion was thrown during a scheduler callback:
setState() called after dispose(): _DropdownMenuState<Object?>#7f4e3(lifecycle state: defunct, not mounted)
This error happens if you call setState() on a State object for a widget that no longer appears in the widget tree (e.g., whose parent widget no longer includes the widget in its build). This error can occur when code calls setState() from a timer or an animation callback.
The preferred solution is to cancel the timer or stop listening to the animation in the dispose() callback. Another solution is to check the "mounted" property of this object before calling setState() to ensure the object is still in the tree.
This error might indicate a memory leak if setState() is being called because another object is retaining a reference to this State object after it has been removed from the tree. To avoid memory leaks, consider breaking the reference to this object during dispose().
When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 294:3 throw_
packages/flutter/src/widgets/framework.dart 1167:9 <fn>
packages/flutter/src/widgets/framework.dart 1201:14 setState
packages/flutter/src/material/dropdown_menu.dart 387:7 <fn>
packages/flutter/src/scheduler/binding.dart 1325:7 [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart 1264:9 handleDrawFrame
packages/flutter/src/scheduler/binding.dart 1113:5 [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1274:5 invoke
lib/_engine/engine/platform_dispatcher.dart 248:5 invokeOnDrawFrame
lib/_engine/engine/initialization.dart 186:36 <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 574:37 _checkAndCall
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 579:39 dcall
====================================================================================================Flutter Doctor output
Doctor output
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.16.3, on macOS 12.6.8 21G725 darwin-x64, locale zh-Hans-CN)
[✗] Android toolchain - develop for Android devices
✗ Unable to locate Android SDK.
Install Android Studio from: https://developer.android.com/studio/index.html
On first launch it will assist you in installing the Android SDK components.
(or visit https://flutter.dev/docs/get-started/install/macos#android-setup for detailed instructions).
If the Android SDK has been installed to a custom location, please use
`flutter config --android-sdk` to update to that location.
[✓] Xcode - develop for iOS and macOS (Xcode 14.2)
[✓] Chrome - develop for the web
[!] Android Studio (not installed)
[✓] IntelliJ IDEA Ultimate Edition (version 2023.2.5)
[✓] VS Code (version 1.84.2)
[✓] VS Code (version 1.83.0-insider)
[✓] Connected device (2 available)
[✓] Network resources
! Doctor found issues in 2 categories.