TabBarView.viewportFraction change is ignored #135557
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
- Run the code sample.
- Press the "Set viewportFraction to 0.6" button.
Expected results
The TabBarView view port is reduced:
Actual results
The TabBarView is unchanged:
Code sample
Code sample
import 'package:flutter/material.dart';
void main() {
runApp(const TabBarViewHome());
}
class TabBarViewHome extends StatelessWidget {
const TabBarViewHome({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
theme: ThemeData(primarySwatch: Colors.blue),
home: const TabBarViewViewportFractionNotUpdatable(),
);
}
}
class TabBarViewViewportFractionNotUpdatable extends StatefulWidget {
const TabBarViewViewportFractionNotUpdatable({super.key});
@override
State<TabBarViewViewportFractionNotUpdatable> createState() =>
_TabBarViewViewportFractionNotUpdatableState();
}
class _TabBarViewViewportFractionNotUpdatableState
extends State<TabBarViewViewportFractionNotUpdatable>
with TickerProviderStateMixin {
TabController? _tabController;
double viewPortFraction = 1.0;
@override
void dispose() {
_tabController?.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
final List<String> tabs = <String>['Red', 'Green', 'Blue'];
void reduceViewPortFraction() {
setState(() {
viewPortFraction = 0.6;
});
}
return DefaultTabController(
length: 3,
initialIndex: 1,
child: Scaffold(
appBar: AppBar(
title: Center(
child: FilledButton(
onPressed: reduceViewPortFraction,
child: const Text('Set viewportFraction to 0.6'),
),
),
bottom: TabBar(
tabs: tabs.map<Widget>((String tab) => Tab(text: tab)).toList(),
),
),
body: TabBarView(
viewportFraction: viewPortFraction,
children: <Widget>[
Container(color: Colors.red),
Container(color: Colors.green),
Container(color: Colors.blue),
],
),
),
);
}
}Screenshots or Video
No response
Logs
Logs
[Paste your logs here]Flutter Doctor output
Doctor output
[!] Flutter (Channel [user-branch], 3.14.0-6.0.pre.736, on Ubuntu 23.04 6.2.0-33-generic, locale fr_FR.UTF-8)
! Flutter version 3.14.0-6.0.pre.736 on channel [user-branch] at /home/bruno/Nevercode/flutter
Currently on an unknown channel. Run `flutter channel` to switch to an official channel.
If that doesn't fix the issue, reinstall Flutter by following instructions at https://flutter.dev/docs/get-started/install.
! Upstream repository unknown source is not the same as FLUTTER_GIT_URL
• FLUTTER_GIT_URL = [email protected]:NevercodeHQ/flutter.git
• Framework revision 7c5838ac51 (il y a 33 minutes), 2023-09-27 09:56:42 +0200
• Engine revision 230dfeed79
• Dart version 3.2.0 (build 3.2.0-199.0.dev)
• DevTools version 2.28.0-dev.12
• If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.
[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.2)
• Android SDK at /media/oldhome/Android/Sdk
• Platform android-33-ext5, build-tools 33.0.2
• ANDROID_HOME = /media/oldhome/Android/Sdk
• Java binary at: /media/oldhome/Produits/android-studio/jre/bin/java
• Java version OpenJDK Runtime Environment (build 11.0.13+0-b1751.21-8125866)
• All Android licenses accepted.
[✓] Chrome - develop for the web
• Chrome at google-chrome
[✓] Linux toolchain - develop for Linux desktop
• Ubuntu clang version 15.0.7
• cmake version 3.25.1
• ninja version 1.11.1
• pkg-config version 1.8.1
[✓] Android Studio (version 2021.3)
• Android Studio at /media/oldhome/Produits/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 11.0.13+0-b1751.21-8125866)
[✓] VS Code (version unknown)
• VS Code at /snap/code/current
• Flutter extension version 3.72.0
✗ Unable to determine VS Code version.
[✓] Connected device (2 available)
• Linux (desktop) • linux • linux-x64 • Ubuntu 23.04 6.2.0-33-generic
• Chrome (web) • chrome • web-javascript • Google Chrome 117.0.5938.88
[✓] Network resources
• All expected network resources are available.Metadata
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Important issues not at the top of the work listflutter/packages/flutter/material repository.Found to occur in 3.15flutter/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 Design Languages teamTriaged by Design Languages team
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