37fd173e03
Fixes #128696 (Motion checkbox) This PR updates the Material 3 tab indicator animation, so that it stretches, as it can be seen in the showcase videos in the specification https://m3.material.io/components/tabs/accessibility#13ed756b-fb35-4bb3-ac8c-1157e49031d8 One thing to note is that the Material 3 videos have a tab transition duration of 700 ms, whereas currently in Flutter the duration is 300 ms. I recorded 4 comparison videos to see the difference better (current animation vs stretch animation and 300 ms vs 700 ms) @Piinks You mentioned the other day that the default tab size could be updated in the future to better reflect the new size in M3. Maybe the `kTabScrollDuration` constant is another one that could end up being updated, as 300 ms for this animation feels too fast. Here are the comparison videos (Material 3 spec showcase on the left and Flutter on the right) ## Original animation - 300 ms https://github.com/flutter/flutter/assets/22084723/d5b594fd-52ea-4328-b8e2-ddb597c81f69 ## New animation - 300 ms https://github.com/flutter/flutter/assets/22084723/c822f7ab-3fc4-4403-a53b-872d047f6227 --- ## Original animation - 700 ms https://github.com/flutter/flutter/assets/22084723/fe39a32d-3d10-4c0d-98df-bd5e1c9336d0 ## New animation - 700 ms https://github.com/flutter/flutter/assets/22084723/8d4b0628-6312-40c2-bd99-b4bcb8e23ba9 --- ## Code sample ```dart void main() => runApp(const MyApp()); class MyApp extends StatelessWidget { const MyApp({super.key}); @override Widget build(BuildContext context) { return const MaterialApp( debugShowCheckedModeBanner: false, home: TabExample(), ); } } class TabExample extends StatelessWidget { const TabExample({super.key}); @override Widget build(BuildContext context) { return DefaultTabController( initialIndex: 1, length: 3, child: Scaffold( appBar: AppBar( title: const Text('My saved media'), bottom: const TabBar( tabs: <Widget>[ Tab( icon: Icon(Icons.videocam_outlined), text: "Video", ), Tab( icon: Icon(Icons.photo_outlined), text: "Photos", ), Tab( icon: Icon(Icons.audiotrack), text: "Audio", ), ], ), ), body: const TabBarView( children: <Widget>[ Center( child: Text("Tab 1"), ), Center( child: Text("Tab 2"), ), Center( child: Text("Tab 3"), ), ], ), ), ); } } ``` *If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*
Flutter is Google's SDK for crafting beautiful, fast user experiences for mobile, web, and desktop from a single codebase. Flutter works with existing code, is used by developers and organizations around the world, and is free and open source.
Documentation
For announcements about new releases, follow the flutter-announce@googlegroups.com mailing list. Our documentation also tracks breaking changes across releases.
Terms of service
The Flutter tool may occasionally download resources from Google servers. By downloading or using the Flutter SDK, you agree to the Google Terms of Service: https://policies.google.com/terms
For example, when installed from GitHub (as opposed to from a prepackaged
archive), the Flutter tool will download the Dart SDK from Google servers
immediately when first run, as it is used to execute the flutter tool itself.
This will also occur when Flutter is upgraded (e.g. by running the flutter upgrade command).
About Flutter
We think Flutter will help you create beautiful, fast apps, with a productive, extensible and open development model, whether you're targeting iOS or Android, web, Windows, macOS, Linux or embedding it as the UI toolkit for a platform of your choice.
Beautiful user experiences
We want to enable designers to deliver their full creative vision without being forced to water it down due to limitations of the underlying framework. Flutter's layered architecture gives you control over every pixel on the screen and its powerful compositing capabilities let you overlay and animate graphics, video, text, and controls without limitation. Flutter includes a full set of widgets that deliver pixel-perfect experiences whether you're building for iOS (Cupertino) or other platforms (Material), along with support for customizing or creating entirely new visual components.
Fast results
Flutter is fast. It's powered by hardware-accelerated 2D graphics libraries like Skia (that underpins Chrome and Android) and Impeller. We architected Flutter to support glitch-free, jank-free graphics at the native speed of your device.
Flutter code is powered by the world-class Dart platform, which enables compilation to 32-bit and 64-bit ARM machine code for iOS and Android, JavaScript and WebAssembly for the web, as well as Intel x64 and ARM for desktop devices.
Productive development
Flutter offers stateful hot reload, allowing you to make changes to your code and see the results instantly without restarting your app or losing its state.
Extensible and open model
Flutter works with any development tool (or none at all), and also includes editor plug-ins for both Visual Studio Code and IntelliJ / Android Studio. Flutter provides tens of thousands of packages to speed your development, regardless of your target platform. And accessing other native code is easy, with support for both FFI (on Android, on iOS, on macOS, and on Windows) as well as platform-specific APIs.
Flutter is a fully open-source project, and we welcome contributions. Information on how to get started can be found in our contributor guide.