
Adds the following: * Darkens when pressed in light mode * Lightens when pressed in dark mode. * Tests that confirm `CupertinoRadio` is focusable and has correct focus colors * Tests that confirm `CupertinoRadio` uses correct default active/inactive/fill colors * Same look in disabled vs. enabled states as native macOS: | Native macOS | Flutter Before | Flutter After | --- | --- | --- | | <img width="50" alt="radio native" src="https://github.com/flutter/flutter/assets/77553258/27c8c27e-f0dc-4ad7-a8c2-361ae8b437bb"> | <img width="50" alt="flutter radio before" src="https://github.com/flutter/flutter/assets/77553258/580d9c4b-0f0d-457e-851f-73450738ee16"> | <img width="50" alt="flutter radio after" src="https://github.com/flutter/flutter/assets/77553258/da6ae21b-87f8-45d8-a2d2-da70ff4853a1"> | * Same look of an unselected radio button in dark mode as native macOS: | Native light mode | Flutter before light mode | Flutter after light mode | Native dark mode | Flutter before dark mode | Flutter after dark mode --- | --- | --- | --- | --- | --- | | <img width="23" alt="native radio light" src="https://github.com/flutter/flutter/assets/77553258/b52fc18b-e10d-4205-b10b-1536fbbf1ca0"> | <img width="23" alt="flutter radio after light" src="https://github.com/flutter/flutter/assets/77553258/54294523-8254-479c-b668-77927a8295f1"> | <img width="23" alt="flutter radio light" src="https://github.com/flutter/flutter/assets/77553258/8472deee-e5ce-4d39-9207-d788ad7f34f4"> | <img width="23" alt="native radio dark" src="https://github.com/flutter/flutter/assets/77553258/44143099-6ab4-4fb8-8a94-ebb1386022c9"> | <img width="23" alt="flutter radio before dark" src="https://github.com/flutter/flutter/assets/77553258/3411d9fb-fc7f-4b20-86a5-34fda167d5b9"> | <img width="23" alt="flutter radio dark" src="https://github.com/flutter/flutter/assets/77553258/39ea3649-142e-43ad-9681-24e1216e0987"> | ## Light mode (with focus highlight) | Native light mode | Flutter before light mode | Flutter after light mode | --- | --- | --- | | <img width="70" alt="native radio light mode" src="https://github.com/user-attachments/assets/914b9f1f-5819-4c5b-8739-8498a72b337f"> | <img width="70" alt="radio flutter focus before" src="https://github.com/user-attachments/assets/3129fca3-3310-4b2b-bcf3-98aa8f049911"> | <img width="70" alt="radio flutter focus after" src="https://github.com/user-attachments/assets/7a2089d9-b2b5-4ff0-9db9-444455301146"> | ## Dark mode | Native dark mode | Flutter before dark mode | Flutter after dark mode | --- | --- | --- | | <img width="70" alt="native radio dark mode" src="https://github.com/user-attachments/assets/4da3c055-ce89-4f37-8fcd-d4cbbc4031a0"> | <img width="70" alt="flutter before radio dark mode" src="https://github.com/user-attachments/assets/36b5f36a-f1d9-4c32-8493-3533a749cf5d"> | <img width="70" alt="flutter radio dark mode after" src="https://github.com/user-attachments/assets/28828e01-bb2f-4217-9756-2766be3919a6"> | ## Disabled light mode | Native | Flutter before | Flutter after | --- | --- | --- | | <img width="120" alt="light disabled radio native" src="https://github.com/user-attachments/assets/bf6d2561-5dcf-4882-afac-6b639fa949b0"> | <img width="120" alt="Screenshot 2024-07-30 at 3 13 30 PM" src="https://github.com/user-attachments/assets/3efc978c-fa58-44e8-877a-ea29778ea384"> | <img width="120" alt="light disabled radio flutter after" src="https://github.com/user-attachments/assets/b2c2e30a-cb8d-40d0-aa6f-75a98caa4829"> | ## Disabled dark mode | Native | Flutter before | Flutter after | --- | --- | --- | | <img width="120" alt="dark disabled radio native" src="https://github.com/user-attachments/assets/feedccc7-9802-4b0c-8038-c9eb771b0eb0"> | <img width="120" alt="Screenshot 2024-07-30 at 3 13 30 PM" src="https://github.com/user-attachments/assets/6d2f03f7-7216-4850-8c4f-f79ae05bb9da"> | <img width="136" alt="dark disabled radio flutter after" src="https://github.com/user-attachments/assets/5e03d4fc-4b8e-4518-b429-6bb58f6d988d"> | `CupertinoRadio` is missing a tristate/mixed state, but [Apple's latest HIG specs discourages its use](https://developer.apple.com/design/human-interface-guidelines/toggles#Radio-buttons). Fixes https://github.com/flutter/flutter/issues/151994 ## 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]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [ ] 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/wiki/Tree-hygiene#overview [Tree Hygiene]: https://github.com/flutter/flutter/wiki/Tree-hygiene [test-exempt]: https://github.com/flutter/flutter/wiki/Tree-hygiene#tests [Flutter Style Guide]: https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo [Features we expect every widget to implement]: https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#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/wiki/Tree-hygiene#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/wiki/Chat [Data Driven Fixes]: https://github.com/flutter/flutter/wiki/Data-driven-Fixes --------- Co-authored-by: Kate Lovett <katelovett@google.com>