mirror of
https://github.com/flutter/flutter.git
synced 2026-02-20 02:29:02 +08:00
2c1e4b1615
<!-- start_original_pr_link --> Reverts: flutter/flutter#162315 <!-- end_original_pr_link --> <!-- start_initiating_author --> Initiated by: TahaTesser <!-- end_initiating_author --> <!-- start_revert_reason --> Reason for reverting: Red tree due to unapproved golden images. <!-- end_revert_reason --> <!-- start_original_pr_author --> Original PR Author: TahaTesser <!-- end_original_pr_author --> <!-- start_reviewers --> Reviewed By: {justinmc} <!-- end_reviewers --> <!-- start_revert_body --> This change reverts the following previous change: Fixes [https://github.com/flutter/flutter/issues/162098](https://github.com/flutter/flutter/issues/162098) ### Description This PR fixes `Tab` linear and elastic animation blinks/flickers when skipping multiple tabs. Previous attempt to fix elastic animation didn't cover linear animation tests and didn't have enough number of tab items which this PR fixes. - Fixed Linear and elastic animation blink issue. - Added tests for linear and elastic animation with various tab sizes (LTR and RTL) - Added tests for linear and elastic animation when skipping tabs (LTR and RTL) ### Code Sample <details> <summary>expand to view the code sample</summary> ```dart import 'package:flutter/material.dart'; // import 'package:flutter/scheduler.dart'; void main() { // timeDilation = 10; runApp(const TabBarDemo()); } class TabBarDemo extends StatelessWidget { const TabBarDemo({super.key}); @override Widget build(BuildContext context) { final List<Widget> tabs = <Widget>[ const Tab(text: 'Short'), const Tab(text: 'A Bit Longer Text'), const Tab(text: 'An Extremely Long Tab Label That Overflows'), const Tab(text: 'Tiny'), const Tab(text: 'Moderate Length'), const Tab(text: 'Just Right'), const Tab(text: 'Supercalifragilisticexpialidocious'), const Tab(text: 'Longer Than Usual'), ]; return MaterialApp( home: DefaultTabController( length: tabs.length, child: Scaffold( appBar: AppBar( bottom: TabBar( tabAlignment: TabAlignment.start, isScrollable: true, indicatorAnimation: TabIndicatorAnimation.elastic, tabs: tabs, ), title: const Text('Tabs Demo'), ), body: TabBarView( children: <Widget>[ for (int i = 0; i < tabs.length; i++) const Icon(Icons.directions_car), ], ), ), ), ); } } ``` </details> ### Before https://github.com/user-attachments/assets/5c271948-5a01-4520-90a3-921c20c79470 ### After https://github.com/user-attachments/assets/6af32d43-3588-488f-ba50-be59323ed692 ### Linear animation before (left) and After (right) comparison. <img width="1048" alt="Screenshot 2025-01-28 at 17 27 50" src="https://github.com/user-attachments/assets/4ba587a5-24d0-40ce-817c-366d004abc05" /> ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [ ] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md <!-- end_revert_body --> Co-authored-by: auto-submit[bot] <flutter-engprod-team@google.com>