Scrollable not changing ScrollBehaviour #130793
Description
Is there an existing issue for this?
- I have searched the existing issues
- I have read the guide to filing a bug
Steps to reproduce
Create a Scrollable widget and change its scrollBehavior property at runtime (using state or hot reload).
Expected results
Changes to scrollBehavior should be applied without completely recreating the Scrollables state.
Actual results
The observed scroll behavior always stays the same.
Code sample
This version does not work:
class _NotWorkingState extends State<NotWorking> {
bool _enable = true;
@override
Widget build(BuildContext context) => MaterialApp(
home: Scaffold(
body: Scrollable(
scrollBehavior: const MaterialScrollBehavior().copyWith(dragDevices: {
if (_enable) PointerDeviceKind.mouse,
}),
viewportBuilder: (context, position) => Viewport(
offset: position,
slivers: [
for (int i = 0; i < 100; i++)
SliverToBoxAdapter(
child: Text("Item $i"),
),
],
),
),
floatingActionButton: FloatingActionButton(onPressed: () {
setState(() {
_enable = !_enable;
});
}),
),
);
}While this one does:
class _WorkingState extends State<Working> {
bool _enable = true;
@override
Widget build(BuildContext context) => MaterialApp(
scrollBehavior: const MaterialScrollBehavior().copyWith(dragDevices: {
if (_enable) PointerDeviceKind.mouse,
}),
home: Scaffold(
body: Scrollable(
viewportBuilder: (context, position) => Viewport(
offset: position,
slivers: [
for (int i = 0; i < 100; i++)
SliverToBoxAdapter(
child: Text("Item $i"),
),
],
),
),
floatingActionButton: FloatingActionButton(onPressed: () {
setState(() {
_enable = !_enable;
});
}),
),
);
}Flutter Doctor output
Doctor output
[√] Flutter (Channel stable, 3.10.6, on Microsoft Windows [Version 10.0.19045.3208], locale de-DE)
• Flutter version 3.10.6 on channel stable at C:\Users\...\flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision f468f3366c (6 days ago), 2023-07-12 15:19:05 -0700
• Engine revision cdbeda788a
• Dart version 3.0.6
• DevTools version 2.23.1
[√] Windows Version (Installed version of Windows is version 10 or higher)
[√] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
• Android SDK at C:\Users\...\AppData\Local\Android\sdk
• Platform android-31, build-tools 31.0.0
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)
• All Android licenses accepted.
[√] Chrome - develop for the web
• Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe
[√] Visual Studio - develop for Windows (Visual Studio Professional 2022 17.6.5)
• Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Professional
• Visual Studio Professional 2022 version 17.6.33829.357
• Windows 10 SDK version 10.0.22000.0
[√] Android Studio (version 2020.3)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin can be installed from:
https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)
[√] VS Code (version 1.80.1)
• VS Code at C:\Users\...\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 3.68.0
[√] Connected device (3 available)
• Windows (desktop) • windows • windows-x64 • Microsoft Windows [Version 10.0.19045.3208]
• Chrome (web) • chrome • web-javascript • Google Chrome 114.0.5735.199
• Edge (web) • edge • web-javascript • Microsoft Edge 114.0.1823.82
[√] Network resources
• All expected network resources are available.