303cbb7cde
**NOTE: Previous [PR](https://github.com/flutter/flutter/pull/148804) was closed because of a bad merge leading to pollution with unrelated commits.** This PR improves on the look and feel of `CupertinoCheckbox` to more closely match native iOS/macOS checkboxes. Adds the following updates from a native macOS checkbox: * Fill color of an unchecked checkbox is a linear gradient that goes from darker at the top to lighter at the bottom in dark mode * Size of box reduced from 18.0 to 14.0 * Stroke width of check reduced from 2.5 to 2.0 * Border color changed from solid black to gray black in light mode and a transparent gray in dark mode * In light mode, checkbox darkens when pressed * In dark mode, checkbox lightens when pressed * Default blue color of a checked checkbox is darker in dark mode ### Light Mode | Native macOS | Flutter Before | Flutter After | | ----------- | ----------- | ----------- | | <img width="63" alt="native checkbox" src="https://github.com/flutter/flutter/assets/77553258/d57d4c78-2e67-49fb-9491-a5acee3782a7"> | <img width="66" alt="Screenshot 2024-06-27 at 10 23 18 AM" src="https://github.com/flutter/flutter/assets/77553258/31c913ff-d36f-4eb5-b737-3a9117bd7eff"> | <img width="66" alt="Screenshot 2024-06-27 at 10 39 22 AM" src="https://github.com/flutter/flutter/assets/77553258/ace8ef29-efae-4049-8f78-13fd39851947"> | ### Dark Mode - Checked | Native macOS | Flutter Before | Flutter After | | ----------- | ----------- | ----------- | | <img width="22" alt="native light" src="https://github.com/user-attachments/assets/fc52d5e1-7ab0-4a5d-b0fa-5b5bee3ed39d"> | <img width="22" alt="flutter before light" src="https://github.com/user-attachments/assets/16e033a1-d2dd-4fb2-a5a5-f730c5f7cdc7"> | <img width="22" alt="flutter after light" src="https://github.com/user-attachments/assets/8c0cff99-930e-4f5e-8540-e64294c1b4fa"> | ### Dark Mode - Unchecked | Native macOS | Flutter Before | Flutter After | | ----------- | ----------- | ----------- | | <img width="22" alt="native dark mode" src="https://github.com/user-attachments/assets/333280a0-85db-4464-9663-03ef7eafc270"> | <img width="22" alt="flutter before dark mode" src="https://github.com/user-attachments/assets/a46e01ec-0d0b-4bb7-8d08-4b2723424a12"> | <img width="22" alt="flutter dark mode" src="https://github.com/user-attachments/assets/a70ae4ad-f1ad-4441-a416-350cbdc32679"> | ### Light Mode - Disabled | Native macOS | Flutter Before | Flutter After | | --- | --- | --- | | <img width="121" alt="native disabled checkbox" src="https://github.com/user-attachments/assets/ed050d14-efec-49dd-82b6-1e7ed7fa99f9"> | <img width="136" alt="flutter b4 disabled checkbox" src="https://github.com/user-attachments/assets/564918cf-f936-448d-b975-7bf9248bbf35"> | <img width="156" alt="flutter disabled checkbox" src="https://github.com/user-attachments/assets/82f672a7-12e8-469c-99af-9f94c959df8f"> | ### Dark Mode - Disabled | Native macOS | Flutter Before | Flutter After | | --- | --- | --- | | <img width="110" alt="disabled dark checkbox native" src="https://github.com/user-attachments/assets/02a43b3f-5619-4b05-9066-2fd43a58c956"> | <img width="136" alt="disabled dark checkbox flutter b4" src="https://github.com/user-attachments/assets/3a3db322-2002-4808-adc0-b10a7ab42381"> | <img width="140" alt="disabled dark checkbox flutter" src="https://github.com/user-attachments/assets/cb91955a-8302-4dc7-8050-221fa2a7045f"> Fixes #148719. Related PR exploring these changes: #147892 ## 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>
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