Odd scroll behavior and occasional asserts with trackpad #149999
Description
Steps to reproduce
- Run flutter create and replace main.dart with the provided code sample.
- Run on macOS
- Do a scroll gesture over the ListView using the trackpad
Expected results
Smooth scroll with bouncing overscroll effect
Can reverse scroll direction without releasing double tap
Actual results
Scroll appears to jump erratically, no overscroll effect
When at viewport top, after trying to scroll up further cannot reverse scroll down by reversing the swipe direction
Current master:
After reverting to 529a4d2:
Occasionally the following asserts are seen:
Logs
════════ Exception caught by scheduler library ═════════════════════════════════
The following assertion was thrown during a scheduler callback:
'package:flutter/src/animation/animation_controller.dart': Failed assertion: line 898 pos 12: 'elapsedInSeconds >= 0.0': is not true.
Either the assertion indicates an error in the framework itself, or we should provide substantially more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
https://github.com/flutter/flutter/issues/new?template=2_bug.yml
When the exception was thrown, this was the stack:
#2 AnimationController._tick (package:flutter/src/animation/animation_controller.dart:898:12)
#3 Ticker._tick (package:flutter/src/scheduler/ticker.dart:258:12)
#4 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1392:15)
#5 SchedulerBinding.handleBeginFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:1235:11)
#6 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:633:13)
#7 SchedulerBinding.handleBeginFrame (package:flutter/src/scheduler/binding.dart:1233:17)
#8 SchedulerBinding._handleBeginFrame (package:flutter/src/scheduler/binding.dart:1150:5)
#9 _invoke1 (dart:ui/hooks.dart:328:13)
#10 PlatformDispatcher._beginFrame (dart:ui/platform_dispatcher.dart:397:5)
#11 _beginFrame (dart:ui/hooks.dart:272:31)
(elided 2 frames from class _AssertionError)
This exception was thrown in the context of a scheduler callback. When the scheduler callback was _registered_ (as opposed to when the exception was thrown), this was the stack:
#2 SchedulerBinding.scheduleFrameCallback (package:flutter/src/scheduler/binding.dart:606:49)
#3 Ticker.scheduleTick (package:flutter/src/scheduler/ticker.dart:274:46)
#4 Ticker.start (package:flutter/src/scheduler/ticker.dart:180:7)
#5 AnimationController._startSimulation (package:flutter/src/animation/animation_controller.dart:818:42)
#6 AnimationController._animateToInternal (package:flutter/src/animation/animation_controller.dart:689:12)
#7 AnimationController.forward (package:flutter/src/animation/animation_controller.dart:498:12)
#8 new InkHighlight (package:flutter/src/material/ink_highlight.dart:60:9)
#9 _InkResponseState.updateHighlight (package:flutter/src/material/ink_well.dart:992:29)
#10 _InkResponseState.handleHoverChange (package:flutter/src/material/ink_well.dart:1269:5)
#11 _InkResponseState.handleMouseEnter (package:flutter/src/material/ink_well.dart:1257:7)
#12 MouseTracker._handleDeviceUpdateMouseEvents (package:flutter/src/rendering/mouse_tracker.dart:423:29)
#13 MouseTracker._handleDeviceUpdate (package:flutter/src/rendering/mouse_tracker.dart:277:5)
#14 MouseTracker.updateAllDevices.<anonymous closure> (package:flutter/src/rendering/mouse_tracker.dart:373:9)
#15 MouseTracker._deviceUpdatePhase (package:flutter/src/rendering/mouse_tracker.dart:205:9)
#16 MouseTracker.updateAllDevices (package:flutter/src/rendering/mouse_tracker.dart:367:5)
#17 RendererBinding._scheduleMouseTrackerUpdate.<anonymous closure> (package:flutter/src/rendering/binding.dart:485:22)
#18 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1392:15)
#19 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1326:11)
#20 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1171:5)
#21 _invoke (dart:ui/hooks.dart:312:13)
#22 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:419:5)
#23 _drawFrame (dart:ui/hooks.dart:283:31)
(elided 2 frames from class _FrameCallbackEntry)
════════════════════════════════════════════════════════════════════════════════
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(50, (index) => ListTile(title: Text('Tile $index'), onTap: () => print('tap! $index'))),
),
),
),
),
],
),
),
);
}
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Important issues not at the top of the work listRunning on desktopError messages from the Flutter frameworkIt was better in the past than it is nowViewports, list views, slivers, etc.Found 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 team