Carousel: Migration from Scrollable+Viewport to CustomScrollView#182475
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It looks like this pull request may not have tests. Please make sure to add tests or get an explicit test exemption before merging. If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix? Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing. If you believe this PR qualifies for a test exemption, contact "@test-exemption-reviewer" in the #hackers channel in Discord (don't just cc them here, they won't see it!). The test exemption team is a small volunteer group, so all reviewers should feel empowered to ask for tests, without delegating that responsibility entirely to the test exemption group. |
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This pull request refactors _CarouselViewState to use CustomScrollView instead of a Scrollable and Viewport combination. This is a good simplification. However, there's a small issue in how the reverse property of CustomScrollView is calculated, which could lead to incorrect scrolling behavior in right-to-left locales. I've left a specific comment with a suggested fix.
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test-exempt: code refactor with no semantic change |
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We should add some unit tests to make sure no regression is introduced. Some cases can be checking the scrolling behavior when TextDirection.rtl, and TextDirection.rtl + reversed.
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LGTM. Thank you for the improvement:)
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Roll Flutter from dad6f9d4107a to b31548feb941 (39 revisions) flutter/flutter@dad6f9d...b31548f 2026-02-25 mdebbar@google.com [web] Fix failure on Firefox 148 (flutter/flutter#182855) 2026-02-25 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from KfPgw04T0OEADLJA5... to XI0Ax7fbtYE4XKYAQ... (flutter/flutter#182887) 2026-02-25 50643541+Mairramer@users.noreply.github.com Use AnimationStyle curve and reverseCurve in ModalBottomSheet animation (flutter/flutter#181403) 2026-02-25 engine-flutter-autoroll@skia.org Roll Dart SDK from fd3dce5b6a4e to 5c57e75f1102 (9 revisions) (flutter/flutter#182801) 2026-02-25 98614782+auto-submit[bot]@users.noreply.github.com Reverts "refactor: remove material in context_menu_controller_test, icon_test, list_wheel_scroll_view_test, media_query_test, platform_menu_bar_test (#182697)" (flutter/flutter#182879) 2026-02-25 ahmedsameha1@gmail.com Make sure that an AnimatedSlide doesn't crash in 0x0 environment (flutter/flutter#181535) 2026-02-24 jmccandless@google.com Reland Standardize on Test* widgets in *_tester.dart files (flutter/flutter#182632) 2026-02-24 nhan13574@gmail.com docs(Path): clarify that zero-length contours are excluded from computeMetrics (flutter/flutter#180165) 2026-02-24 mdebbar@google.com Fix typo in assert message (flutter/flutter#182843) 2026-02-24 matej.knopp@gmail.com [win32] Fix overflow in TaskRunnerWindow. (flutter/flutter#182822) 2026-02-24 abadasamuelosp@gmail.com feat: Add --no-uninstall flag to flutter test for integration tests (flutter/flutter#182714) 2026-02-24 74057391+jhonathanqz@users.noreply.github.com Rename noFrequencyBasedMinification to useFrequencyBasedMinification (flutter/flutter#182684) 2026-02-24 60122246+xiaowei-guan@users.noreply.github.com [Impeller] Fix fail to render pixel buffer texture on Linux (flutter/flutter#181656) 2026-02-24 15619084+vashworth@users.noreply.github.com Remove FlutterFramework app migration (flutter/flutter#182100) 2026-02-24 engine-flutter-autoroll@skia.org Roll Packages from 12b43a1 to 062c8d4 (5 revisions) (flutter/flutter#182839) 2026-02-24 mdebbar@google.com [web] Run webparagraph tests in CI (flutter/flutter#182092) 2026-02-24 jason-simmons@users.noreply.github.com Fix a race in EmbedderTest.CanSpecifyCustomUITaskRunner (flutter/flutter#182649) 2026-02-24 srawlins@google.com flutter_tools: Use a super-parameter in several missed cases (flutter/flutter#182581) 2026-02-24 116356835+AbdeMohlbi@users.noreply.github.com Replace more references to `flutter/engine` with `flutter/flutter` (flutter/flutter#182654) 2026-02-24 50643541+Mairramer@users.noreply.github.com Carousel: Migration from Scrollable+Viewport to CustomScrollView (flutter/flutter#182475) 2026-02-24 97480502+b-luk@users.noreply.github.com Refactor impellerc_main to better organize some of its logic (flutter/flutter#182783) 2026-02-24 116356835+AbdeMohlbi@users.noreply.github.com Remove unused `getPluginList ` (flutter/flutter#182660) 2026-02-24 34465683+rkishan516@users.noreply.github.com Refactor: Remove material from ticker provider test (flutter/flutter#181697) 2026-02-24 engine-flutter-autoroll@skia.org Roll Skia from 26eebffe12bd to f44d7db68805 (3 revisions) (flutter/flutter#182821) 2026-02-24 34465683+rkishan516@users.noreply.github.com refactor: remove material in context_menu_controller_test, icon_test, list_wheel_scroll_view_test, media_query_test, platform_menu_bar_test (flutter/flutter#182697) 2026-02-24 engine-flutter-autoroll@skia.org Roll Skia from 7dad66aae75a to 26eebffe12bd (5 revisions) (flutter/flutter#182810) 2026-02-24 pokepsi@gmail.com Update roadmap for 2026 (flutter/flutter#182798) 2026-02-24 fluttergithubbot@gmail.com Marks Windows tool_tests_commands_1_2 to be unflaky (flutter/flutter#179670) 2026-02-23 zhongliu88889@gmail.com [web] scroll iOS iframe text input into view (flutter/flutter#179759) 2026-02-23 Mail@maikwild.de Fix textscaler clamp assertion error (flutter/flutter#181716) 2026-02-23 engine-flutter-autoroll@skia.org Roll Skia from 9a5a3c92c336 to 7dad66aae75a (4 revisions) (flutter/flutter#182779) 2026-02-23 116356835+AbdeMohlbi@users.noreply.github.com Move more getters from userMessages class to the appropriate places (flutter/flutter#182656) 2026-02-23 engine-flutter-autoroll@skia.org Manual roll Dart SDK from f8fac50475b8 to fd3dce5b6a4e (6 revisions) (flutter/flutter#182768) 2026-02-23 15619084+vashworth@users.noreply.github.com Copy Flutter framework to Add to App FlutterPluginRgistrant (flutter/flutter#182523) 2026-02-23 mr-peipei@web.de Add progress indicator to artifact downloads (flutter/flutter#181808) 2026-02-23 47866232+chunhtai@users.noreply.github.com Clarify batch release mode requirements (flutter/flutter#182228) 2026-02-23 mdebbar@google.com [web] Remove --disable-gpu from flutter chrome tests (flutter/flutter#182618) 2026-02-23 jwren@google.com running-apps: update running-apps to use Duration.ago() (flutter/flutter#182172) 2026-02-23 kevmoo@users.noreply.github.com Refactor bin/ shell scripts for better performance and safety (flutter/flutter#182674) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC louisehsu@google.com,stuartmorgan@google.com on the revert to ensure that a human is aware of the problem. ...
…tter#182475) Closes flutter#149765 ## 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. - [ ] I updated/added relevant documentation (doc comments with `///`). - [ ] 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]. **Note**: The Flutter team is currently trialing the use of [Gemini Code Assist for GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code). Comments from the `gemini-code-assist` bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed. <!-- 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
…r#11116) Roll Flutter from dad6f9d4107a to b31548feb941 (39 revisions) flutter/flutter@dad6f9d...b31548f 2026-02-25 mdebbar@google.com [web] Fix failure on Firefox 148 (flutter/flutter#182855) 2026-02-25 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from KfPgw04T0OEADLJA5... to XI0Ax7fbtYE4XKYAQ... (flutter/flutter#182887) 2026-02-25 50643541+Mairramer@users.noreply.github.com Use AnimationStyle curve and reverseCurve in ModalBottomSheet animation (flutter/flutter#181403) 2026-02-25 engine-flutter-autoroll@skia.org Roll Dart SDK from fd3dce5b6a4e to 5c57e75f1102 (9 revisions) (flutter/flutter#182801) 2026-02-25 98614782+auto-submit[bot]@users.noreply.github.com Reverts "refactor: remove material in context_menu_controller_test, icon_test, list_wheel_scroll_view_test, media_query_test, platform_menu_bar_test (#182697)" (flutter/flutter#182879) 2026-02-25 ahmedsameha1@gmail.com Make sure that an AnimatedSlide doesn't crash in 0x0 environment (flutter/flutter#181535) 2026-02-24 jmccandless@google.com Reland Standardize on Test* widgets in *_tester.dart files (flutter/flutter#182632) 2026-02-24 nhan13574@gmail.com docs(Path): clarify that zero-length contours are excluded from computeMetrics (flutter/flutter#180165) 2026-02-24 mdebbar@google.com Fix typo in assert message (flutter/flutter#182843) 2026-02-24 matej.knopp@gmail.com [win32] Fix overflow in TaskRunnerWindow. (flutter/flutter#182822) 2026-02-24 abadasamuelosp@gmail.com feat: Add --no-uninstall flag to flutter test for integration tests (flutter/flutter#182714) 2026-02-24 74057391+jhonathanqz@users.noreply.github.com Rename noFrequencyBasedMinification to useFrequencyBasedMinification (flutter/flutter#182684) 2026-02-24 60122246+xiaowei-guan@users.noreply.github.com [Impeller] Fix fail to render pixel buffer texture on Linux (flutter/flutter#181656) 2026-02-24 15619084+vashworth@users.noreply.github.com Remove FlutterFramework app migration (flutter/flutter#182100) 2026-02-24 engine-flutter-autoroll@skia.org Roll Packages from 12b43a1 to 062c8d4 (5 revisions) (flutter/flutter#182839) 2026-02-24 mdebbar@google.com [web] Run webparagraph tests in CI (flutter/flutter#182092) 2026-02-24 jason-simmons@users.noreply.github.com Fix a race in EmbedderTest.CanSpecifyCustomUITaskRunner (flutter/flutter#182649) 2026-02-24 srawlins@google.com flutter_tools: Use a super-parameter in several missed cases (flutter/flutter#182581) 2026-02-24 116356835+AbdeMohlbi@users.noreply.github.com Replace more references to `flutter/engine` with `flutter/flutter` (flutter/flutter#182654) 2026-02-24 50643541+Mairramer@users.noreply.github.com Carousel: Migration from Scrollable+Viewport to CustomScrollView (flutter/flutter#182475) 2026-02-24 97480502+b-luk@users.noreply.github.com Refactor impellerc_main to better organize some of its logic (flutter/flutter#182783) 2026-02-24 116356835+AbdeMohlbi@users.noreply.github.com Remove unused `getPluginList ` (flutter/flutter#182660) 2026-02-24 34465683+rkishan516@users.noreply.github.com Refactor: Remove material from ticker provider test (flutter/flutter#181697) 2026-02-24 engine-flutter-autoroll@skia.org Roll Skia from 26eebffe12bd to f44d7db68805 (3 revisions) (flutter/flutter#182821) 2026-02-24 34465683+rkishan516@users.noreply.github.com refactor: remove material in context_menu_controller_test, icon_test, list_wheel_scroll_view_test, media_query_test, platform_menu_bar_test (flutter/flutter#182697) 2026-02-24 engine-flutter-autoroll@skia.org Roll Skia from 7dad66aae75a to 26eebffe12bd (5 revisions) (flutter/flutter#182810) 2026-02-24 pokepsi@gmail.com Update roadmap for 2026 (flutter/flutter#182798) 2026-02-24 fluttergithubbot@gmail.com Marks Windows tool_tests_commands_1_2 to be unflaky (flutter/flutter#179670) 2026-02-23 zhongliu88889@gmail.com [web] scroll iOS iframe text input into view (flutter/flutter#179759) 2026-02-23 Mail@maikwild.de Fix textscaler clamp assertion error (flutter/flutter#181716) 2026-02-23 engine-flutter-autoroll@skia.org Roll Skia from 9a5a3c92c336 to 7dad66aae75a (4 revisions) (flutter/flutter#182779) 2026-02-23 116356835+AbdeMohlbi@users.noreply.github.com Move more getters from userMessages class to the appropriate places (flutter/flutter#182656) 2026-02-23 engine-flutter-autoroll@skia.org Manual roll Dart SDK from f8fac50475b8 to fd3dce5b6a4e (6 revisions) (flutter/flutter#182768) 2026-02-23 15619084+vashworth@users.noreply.github.com Copy Flutter framework to Add to App FlutterPluginRgistrant (flutter/flutter#182523) 2026-02-23 mr-peipei@web.de Add progress indicator to artifact downloads (flutter/flutter#181808) 2026-02-23 47866232+chunhtai@users.noreply.github.com Clarify batch release mode requirements (flutter/flutter#182228) 2026-02-23 mdebbar@google.com [web] Remove --disable-gpu from flutter chrome tests (flutter/flutter#182618) 2026-02-23 jwren@google.com running-apps: update running-apps to use Duration.ago() (flutter/flutter#182172) 2026-02-23 kevmoo@users.noreply.github.com Refactor bin/ shell scripts for better performance and safety (flutter/flutter#182674) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC louisehsu@google.com,stuartmorgan@google.com on the revert to ensure that a human is aware of the problem. ...
…tter#182475) Closes flutter#149765 ## 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. - [ ] I updated/added relevant documentation (doc comments with `///`). - [ ] 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]. **Note**: The Flutter team is currently trialing the use of [Gemini Code Assist for GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code). Comments from the `gemini-code-assist` bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed. <!-- 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
…r#11116) Roll Flutter from dad6f9d4107a to b31548feb941 (39 revisions) flutter/flutter@dad6f9d...b31548f 2026-02-25 mdebbar@google.com [web] Fix failure on Firefox 148 (flutter/flutter#182855) 2026-02-25 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from KfPgw04T0OEADLJA5... to XI0Ax7fbtYE4XKYAQ... (flutter/flutter#182887) 2026-02-25 50643541+Mairramer@users.noreply.github.com Use AnimationStyle curve and reverseCurve in ModalBottomSheet animation (flutter/flutter#181403) 2026-02-25 engine-flutter-autoroll@skia.org Roll Dart SDK from fd3dce5b6a4e to 5c57e75f1102 (9 revisions) (flutter/flutter#182801) 2026-02-25 98614782+auto-submit[bot]@users.noreply.github.com Reverts "refactor: remove material in context_menu_controller_test, icon_test, list_wheel_scroll_view_test, media_query_test, platform_menu_bar_test (#182697)" (flutter/flutter#182879) 2026-02-25 ahmedsameha1@gmail.com Make sure that an AnimatedSlide doesn't crash in 0x0 environment (flutter/flutter#181535) 2026-02-24 jmccandless@google.com Reland Standardize on Test* widgets in *_tester.dart files (flutter/flutter#182632) 2026-02-24 nhan13574@gmail.com docs(Path): clarify that zero-length contours are excluded from computeMetrics (flutter/flutter#180165) 2026-02-24 mdebbar@google.com Fix typo in assert message (flutter/flutter#182843) 2026-02-24 matej.knopp@gmail.com [win32] Fix overflow in TaskRunnerWindow. (flutter/flutter#182822) 2026-02-24 abadasamuelosp@gmail.com feat: Add --no-uninstall flag to flutter test for integration tests (flutter/flutter#182714) 2026-02-24 74057391+jhonathanqz@users.noreply.github.com Rename noFrequencyBasedMinification to useFrequencyBasedMinification (flutter/flutter#182684) 2026-02-24 60122246+xiaowei-guan@users.noreply.github.com [Impeller] Fix fail to render pixel buffer texture on Linux (flutter/flutter#181656) 2026-02-24 15619084+vashworth@users.noreply.github.com Remove FlutterFramework app migration (flutter/flutter#182100) 2026-02-24 engine-flutter-autoroll@skia.org Roll Packages from 12b43a1 to 062c8d4 (5 revisions) (flutter/flutter#182839) 2026-02-24 mdebbar@google.com [web] Run webparagraph tests in CI (flutter/flutter#182092) 2026-02-24 jason-simmons@users.noreply.github.com Fix a race in EmbedderTest.CanSpecifyCustomUITaskRunner (flutter/flutter#182649) 2026-02-24 srawlins@google.com flutter_tools: Use a super-parameter in several missed cases (flutter/flutter#182581) 2026-02-24 116356835+AbdeMohlbi@users.noreply.github.com Replace more references to `flutter/engine` with `flutter/flutter` (flutter/flutter#182654) 2026-02-24 50643541+Mairramer@users.noreply.github.com Carousel: Migration from Scrollable+Viewport to CustomScrollView (flutter/flutter#182475) 2026-02-24 97480502+b-luk@users.noreply.github.com Refactor impellerc_main to better organize some of its logic (flutter/flutter#182783) 2026-02-24 116356835+AbdeMohlbi@users.noreply.github.com Remove unused `getPluginList ` (flutter/flutter#182660) 2026-02-24 34465683+rkishan516@users.noreply.github.com Refactor: Remove material from ticker provider test (flutter/flutter#181697) 2026-02-24 engine-flutter-autoroll@skia.org Roll Skia from 26eebffe12bd to f44d7db68805 (3 revisions) (flutter/flutter#182821) 2026-02-24 34465683+rkishan516@users.noreply.github.com refactor: remove material in context_menu_controller_test, icon_test, list_wheel_scroll_view_test, media_query_test, platform_menu_bar_test (flutter/flutter#182697) 2026-02-24 engine-flutter-autoroll@skia.org Roll Skia from 7dad66aae75a to 26eebffe12bd (5 revisions) (flutter/flutter#182810) 2026-02-24 pokepsi@gmail.com Update roadmap for 2026 (flutter/flutter#182798) 2026-02-24 fluttergithubbot@gmail.com Marks Windows tool_tests_commands_1_2 to be unflaky (flutter/flutter#179670) 2026-02-23 zhongliu88889@gmail.com [web] scroll iOS iframe text input into view (flutter/flutter#179759) 2026-02-23 Mail@maikwild.de Fix textscaler clamp assertion error (flutter/flutter#181716) 2026-02-23 engine-flutter-autoroll@skia.org Roll Skia from 9a5a3c92c336 to 7dad66aae75a (4 revisions) (flutter/flutter#182779) 2026-02-23 116356835+AbdeMohlbi@users.noreply.github.com Move more getters from userMessages class to the appropriate places (flutter/flutter#182656) 2026-02-23 engine-flutter-autoroll@skia.org Manual roll Dart SDK from f8fac50475b8 to fd3dce5b6a4e (6 revisions) (flutter/flutter#182768) 2026-02-23 15619084+vashworth@users.noreply.github.com Copy Flutter framework to Add to App FlutterPluginRgistrant (flutter/flutter#182523) 2026-02-23 mr-peipei@web.de Add progress indicator to artifact downloads (flutter/flutter#181808) 2026-02-23 47866232+chunhtai@users.noreply.github.com Clarify batch release mode requirements (flutter/flutter#182228) 2026-02-23 mdebbar@google.com [web] Remove --disable-gpu from flutter chrome tests (flutter/flutter#182618) 2026-02-23 jwren@google.com running-apps: update running-apps to use Duration.ago() (flutter/flutter#182172) 2026-02-23 kevmoo@users.noreply.github.com Refactor bin/ shell scripts for better performance and safety (flutter/flutter#182674) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC louisehsu@google.com,stuartmorgan@google.com on the revert to ensure that a human is aware of the problem. ...
Closes #149765
Pre-launch Checklist
///).If you need help, consider asking for advice on the #hackers-new channel on Discord.
Note: The Flutter team is currently trialing the use of Gemini Code Assist for GitHub. Comments from the
gemini-code-assistbot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed.