Scrollbar throws due to recent assert changes #84735
Description
Steps to Reproduce
- PrimaryScrollController (or any other scroll controller that attaches both to scrollbar and view) ->
PageTransitionSwitcher ->
SharedAxisTransition ->
Scrollbar ->
View - Animate the switcher
Related PR #81278
Code sample
import 'package:flutter/material.dart';
import 'package:animations/animations.dart';
void main() {
runApp(App());
}
class App extends StatefulWidget {
@override
State<App> createState() => _AppState();
}
class _AppState extends State<App> {
late final views = [
for (int i = 0; i < 5; i++)
Scrollbar(
interactive: true,
key: ValueKey(i),
child: ListView.builder(
itemCount: 100,
itemBuilder: (context, index) => Text(index.toString()),
),
),
];
int index = 0;
void _handleTap() {
setState(() {
index += 1;
if (index == views.length) {
index = 0;
}
});
}
final controller = ScrollController();
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'App',
home: PrimaryScrollController(
controller: controller,
child: Scaffold(
body: Column(
children: [
ElevatedButton(onPressed: _handleTap, child: Text('sample text')),
Expanded(
child: PageTransitionSwitcher(
duration: const Duration(milliseconds: 300),
transitionBuilder: (child, animation, secondaryAnimation) {
return SharedAxisTransition(
transitionType: SharedAxisTransitionType.horizontal,
animation: animation,
secondaryAnimation: secondaryAnimation,
fillColor: Colors.transparent,
child: child,
);
},
child: views[index],
),
),
],
),
),
),
);
}
}
Logs
════════ Exception caught by scheduler library ═════════════════════════════════
The following assertion was thrown during a scheduler callback:
The PrimaryScrollController is currently attached to more than one ScrollPosition.
The Scrollbar requires a single ScrollPosition in order to be painted.
When the scrollbar is interactive, the associated Scrollable widgets must have unique ScrollControllers. The PrimaryScrollController is used by default for ScrollViews with an Axis.vertical ScrollDirection, unless the ScrollView has been provided its own ScrollController. More than one Scrollable may have tried to use the PrimaryScrollController of the current context.
When the exception was thrown, this was the stack
#0 RawScrollbarState._checkForValidScrollPosition.<anonymous closure>
package:flutter/…/widgets/scrollbar.dart:1101
#1 RawScrollbarState._checkForValidScrollPosition
package:flutter/…/widgets/scrollbar.dart:1125
#2 RawScrollbarState._maybeTriggerScrollbar.<anonymous closure>
package:flutter/…/widgets/scrollbar.dart:1042
#3 SchedulerBinding._invokeFrameCallback
package:flutter/…/scheduler/binding.dart:1143
#4 SchedulerBinding.handleDrawFrame
package:flutter/…/scheduler/binding.dart:1088
#5 SchedulerBinding._handleDrawFrame
package:flutter/…/scheduler/binding.dart:996
#9 _invoke (dart:ui/hooks.dart:163:10)
#10 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:259:5)
#11 _drawFrame (dart:ui/hooks.dart:126:31)
(elided 3 frames from dart:async)
════════════════════════════════════════════════════════════════════════════════
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! Doctor found issues in 1 category.