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implimented https://github.com/flutter/flutter/issues/166910 https://github.com/user-attachments/assets/fe9aa2ce-b8a5-4458-b04a-781763959169 ## How to Verify - Set enableDrag: false in CupertinoSheetRoute or showCupertinoSheet. ```diff showCupertinoDialog<void>( context: context, + barrierColor: CupertinoColors.activeOrange.withValues(alpha: 0.5), builder: (BuildContext context) => CupertinoAlertDialog( title: const Text('Alert'), content: const Text('Proceed with destructive action?'), actions: <CupertinoDialogAction>[ CupertinoDialogAction( /// This parameter indicates this action is the default, /// and turns the action's text to bold text. isDefaultAction: true, onPressed: () { Navigator.pop(context); }, child: const Text('No'), ), CupertinoDialogAction( /// This parameter indicates the action would perform /// a destructive action such as deletion, and turns /// the action's text color to red. isDestructiveAction: true, onPressed: () { Navigator.pop(context); }, child: const Text('Yes'), ), ], ), ); ``` - The following is a screenshot of `examples/api/lib/cupertino/dialog/cupertino_alert_dialog.0.dart` after adding `barrierColor: CupertinoColors.activeOrange.withValues(alpha: 0.5),`. ## 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 `///`). - [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. - [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