Assert in ScrollbarPainter on scroll with trackpad #149803
Description
Steps to reproduce
- Run
flutter createand replace main.dart with the provided code sample. - Run on macOS making sure the window is larger than the ListView with 5 elements so there's no real scroll.
- Do a scroll gesture over the ListView using the trackpad
Expected results
Nothing happens.
Actual results
LateInitializationError assert is shown:
════════ Exception caught by gesture ═══════════════════════════════════════════
The following LateError was thrown while handling a gesture:
LateInitializationError: Field '_thumbExtent@528211710' has not been initialized.
When the exception was thrown, this was the stack:
#0 ScrollbarPainter._thumbExtent (package:flutter/src/widgets/scrollbar.dart)
#1 ScrollbarPainter.getThumbScrollOffset (package:flutter/src/widgets/scrollbar.dart:662:54)
#2 RawScrollbarState.handleThumbPressStart (package:flutter/src/widgets/scrollbar.dart:1695:46)
#3 _MaterialScrollbarState.handleThumbPressStart (package:flutter/src/material/scrollbar.dart:360:11)
#4 RawScrollbarState._handleThumbDragStart (package:flutter/src/widgets/scrollbar.dart:1919:5)
#5 DragGestureRecognizer._checkStart.<anonymous closure> (package:flutter/src/gestures/monodrag.dart:785:53)
#6 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:344:24)
#7 DragGestureRecognizer._checkStart (package:flutter/src/gestures/monodrag.dart:785:7)
#8 DragGestureRecognizer._checkDrag (package:flutter/src/gestures/monodrag.dart:752:5)
#9 DragGestureRecognizer.acceptGesture (package:flutter/src/gestures/monodrag.dart:679:7)
#10 GestureArenaManager._resolveByDefault (package:flutter/src/gestures/arena.dart:269:25)
#11 GestureArenaManager._tryToResolveArena.<anonymous closure> (package:flutter/src/gestures/arena.dart:249:31)
(elided 2 frames from dart:async)
Handler: "onStart"
Recognizer: _VerticalThumbDragGestureRecognizer#3233f
debugOwner: _MaterialScrollbarState#f529f(tickers: tracking 2 tickers)
start behavior: down
════════════════════════════════════════════════════════════════════════════════
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> {
final ScrollController _scrollController = ScrollController();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Text('Scroll me'),
Expanded(
child: Scrollbar(
controller: _scrollController,
child: ScrollConfiguration(
behavior: ScrollConfiguration.of(context).copyWith(
scrollbars: false,
physics: const BouncingScrollPhysics(),
),
child: ListView(
controller: _scrollController,
children: List<ListTile>.generate(5, (index) => ListTile(title: Text('Tile $index'), onTap: () => print('tap!'))),
),
),
),
),
],
),
),
);
}
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Flutter Doctor output
Doctor output
% flutter doctor -v
[✓] Flutter (Channel master, 3.23.0-13.0.pre.121, on macOS 14.5 23F79 darwin-arm64, locale en-ES)
• Flutter version 3.23.0-13.0.pre.121 on channel master at /Users/tgucio/Library/Frameworks/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 4608a89137 (5 hours ago), 2024-06-06 08:11:25 +0200
• Engine revision 92d0cd9370
• Dart version 3.5.0 (build 3.5.0-227.0.dev)
• DevTools version 2.36.0
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
• Android SDK at /Users/tgucio/Library/Android/sdk
• Platform android-34, build-tools 34.0.0
• Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 17.0.9+0-17.0.9b1087.7-11185874)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 15.4)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 15F31d
• CocoaPods version 1.15.2
[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 2023.2)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
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• Java version OpenJDK Runtime Environment (build 17.0.9+0-17.0.9b1087.7-11185874)
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• Flutter extension version 3.90.0Metadata
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High-priority issues at the top of the work listRunning on desktopError messages from the Flutter frameworkStack traces logged to the consoleIt was better in the past than it is nowFound to occur in 3.23flutter/packages/flutter repository. See also f: labels.The issue has been confirmed reproducible and is ready to work onIssue is closed as already fixed in a newer versionOwned by Framework teamTriaged by Framework teamA fix is in flight