Use null-aware elements in cupertino/nav_bar.dart#181237
Merged
auto-submit[bot] merged 1 commit intoflutter:masterfrom Jan 22, 2026
Merged
Use null-aware elements in cupertino/nav_bar.dart#181237auto-submit[bot] merged 1 commit intoflutter:masterfrom
auto-submit[bot] merged 1 commit intoflutter:masterfrom
Conversation
|
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. |
github-actions
bot
added
framework
![gemini-code-assist[bot]](proxy.php?url=https://avatars.githubusercontent.com/in/956858?s=60&v=4){kind=small}
Contributor
There was a problem hiding this comment.
Code Review
This pull request successfully refactors the _NavigationBarTransition widget in cupertino/nav_bar.dart by adopting the more concise null-aware element syntax (?x). This change replaces 16 instances of the verbose if (x != null) x! pattern, significantly improving code readability and conciseness without altering functionality. The update aligns with modern Dart/Flutter best practices for handling nullable types.
dkwingsmt
approved these changes
Jan 22, 2026
Contributor
dkwingsmt
left a comment
dkwingsmt
left a comment
There was a problem hiding this comment.
LGTM. Thanks for the cleanup!
gaaclarke
approved these changes
Jan 22, 2026
loic-sharma
approved these changes
Jan 22, 2026
Member
There was a problem hiding this comment.
LGTM but this will need a test exemption before we can land this :)
I requested one here: https://discord.com/channels/608014603317936148/608018585025118217/1463705291681038601
dkwingsmt
added
the
autosubmit
flutter-dashboard
bot
removed
the
autosubmit
Contributor
|
test-exempt: code refactor with no semantic change |
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jan 22, 2026
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jan 22, 2026
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jan 22, 2026
engine-flutter-autoroll
added a commit
to engine-flutter-autoroll/packages
that referenced
this pull request
Jan 23, 2026
auto-submit bot
pushed a commit
to flutter/packages
that referenced
this pull request
Jan 23, 2026
Roll Flutter from 48c2475 to bfc9041eb118 (173 revisions) flutter/flutter@48c2475...bfc9041 2026-01-23 [email protected] No longer exiting the application when the RegularWindow is destroyed + resolving the window created promise after runWidget (flutter/flutter#181339) 2026-01-23 [email protected] Remove unnecessary Material import from dialog_test.dart (flutter/flutter#181249) 2026-01-23 [email protected] Roll Skia from 8e516fe6828f to db10db8bd55f (1 revision) (flutter/flutter#181379) 2026-01-23 [email protected] Reset TextFormField to initial value after state change (flutter/flutter#181199) 2026-01-23 [email protected] Roll Dart SDK from 980b2b41d36e to e82d7ad1855e (1 revision) (flutter/flutter#181375) 2026-01-23 [email protected] Roll Skia from 3e86f377d300 to 8e516fe6828f (4 revisions) (flutter/flutter#181370) 2026-01-23 [email protected] Remove unnecessary Material import from sliver_visibility_test (flutter/flutter#181248) 2026-01-23 [email protected] Add bottom navigation bar item semantics label (flutter/flutter#180577) 2026-01-23 [email protected] Make topGap not required for CupertinoSheetTransition (flutter/flutter#181269) 2026-01-23 [email protected] Roll Fuchsia Linux SDK from b4cLyhuxciUC-4zCJ... to n7NohL9DPpEuPjNt9... (flutter/flutter#181365) 2026-01-23 [email protected] Roll Dart SDK from 806f04638561 to 980b2b41d36e (1 revision) (flutter/flutter#181364) 2026-01-23 [email protected] Reland hybrid views test (flutter/flutter#181336) 2026-01-23 [email protected] Revert DropdownMenu non-nullable breaking change (flutter/flutter#181074) 2026-01-23 [email protected] Fix leaks in `flutter_test` tests (flutter/flutter#180879) 2026-01-23 [email protected] Re-enable fragment_shader_tests.dart 'Shader Compiler appropriately pads vec3 uniform arrays' test on Vulkan (flutter/flutter#181292) 2026-01-23 [email protected] [ Tool ] Fix `update-packages` failing due to mismatched dependencies between flutter_tools and the framework (flutter/flutter#181335) 2026-01-23 [email protected] [Impeller] Make dynamically created shader metadata for runtime effects consistent with metadata for built-in shaders (flutter/flutter#181201) 2026-01-23 [email protected] Broaden the applicability of `Color` fix_data rules from flutter/painting.dart (flutter/flutter#181093) 2026-01-23 [email protected] Fixes macOS App.framework not being codesigned or find framework (flutter/flutter#181348) 2026-01-22 [email protected] Roll Fuchsia GN SDK from NAEC5tfgSl8g94nwp... to JLBh4Z9PKsjIJcqDU... (flutter/flutter#181139) 2026-01-22 [email protected] Roll Dart SDK from ab4640ea82e9 to 806f04638561 (2 revisions) (flutter/flutter#181347) 2026-01-22 [email protected] Add ExpansibleController.toggle method. (flutter/flutter#181320) 2026-01-22 [email protected] Fixes Typo in codebase (flutter/flutter#181256) 2026-01-22 [email protected] Roll Skia from 4766615bcc96 to 3e86f377d300 (3 revisions) (flutter/flutter#181346) 2026-01-22 [email protected] Make sure that a Hero doesn't crash in 0x0 environment (flutter/flutter#180954) 2026-01-22 [email protected] Reland "Fix capitalization of the path to FlutterWindowControllerTest.mm in the macOS platform build script" (flutter/flutter#181200) 2026-01-22 [email protected] Roll Skia from 6e9746be8c4a to 4766615bcc96 (3 revisions) (flutter/flutter#181331) 2026-01-22 [email protected] Fix remove material import textfield (flutter/flutter#181254) 2026-01-22 [email protected] Add FlutterFramework as an Xcode SwiftPM local package override (flutter/flutter#179512) 2026-01-22 [email protected] Roll Dart SDK from 7bd4c68b625c to ab4640ea82e9 (1 revision) (flutter/flutter#181324) 2026-01-22 [email protected] Roll Packages from d80c60e to 9010299 (9 revisions) (flutter/flutter#181323) 2026-01-22 [email protected] Roll Dart SDK from 2d53a77adc5d to 7bd4c68b625c (2 revisions) (flutter/flutter#181316) 2026-01-22 [email protected] Roll Skia from 3f6949bc5780 to 6e9746be8c4a (2 revisions) (flutter/flutter#181311) 2026-01-22 [email protected] Roll Skia from ef6efc358b4a to 3f6949bc5780 (2 revisions) (flutter/flutter#181307) 2026-01-22 [email protected] Roll Dart SDK from 5d7c8faf2e41 to 2d53a77adc5d (1 revision) (flutter/flutter#181305) 2026-01-22 [email protected] [Material] update hourFormat to use Dart 3 switch expression (flutter/flutter#181041) 2026-01-22 [email protected] Use null-aware elements in cupertino/nav_bar.dart (flutter/flutter#181237) 2026-01-22 [email protected] Roll Fuchsia Linux SDK from b2KIEXVAlEqImQ9VO... to b4cLyhuxciUC-4zCJ... (flutter/flutter#181297) 2026-01-22 [email protected] Roll pub packages (flutter/flutter#181295) 2026-01-22 [email protected] Enables fragment shader test for impeller (fixes mat2 on vulkan) (flutter/flutter#181013) 2026-01-21 [email protected] Roll Dart SDK from 366200db1aa1 to 5d7c8faf2e41 (4 revisions) (flutter/flutter#181290) 2026-01-21 [email protected] Roll Skia from b5ec89e31f59 to ef6efc358b4a (19 revisions) (flutter/flutter#181289) 2026-01-21 [email protected] fix description for semantics finders (flutter/flutter#181214) 2026-01-21 [email protected] Make sure that an Icon doesn't crash in 0x0 environment (flutter/flutter#181021) 2026-01-21 [email protected] Make sure that a GridPaper doesn't crash in 0x0 environment (flutter/flutter#180906) 2026-01-21 [email protected] Bring Linux coverage out of bringup (flutter/flutter#181280) ...
flutter-zl
pushed a commit
to flutter-zl/flutter
that referenced
this pull request
Feb 10, 2026
## Description Adopts null-aware element syntax (`?x`) in `cupertino/nav_bar.dart`, replacing 16 instances of the verbose `if (x != null) x!` pattern in the `_NavigationBarTransition` widget's children list. Fixes flutter#172188 ## 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]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] All existing and new tests are passing. [Contributor Guide]: https://github.com/flutter/flutter/blob/master/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/master/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/master/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/master/docs/contributing/Style-guide-for-Flutter-repo.md [](https://www.talabat.com) [](https://github.com/search?q=org%3Aflutter+talabat&type=pullrequests)
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
5 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Description
Adopts null-aware element syntax (
?x) incupertino/nav_bar.dart, replacing 16 instances of the verboseif (x != null) x!pattern in the_NavigationBarTransitionwidget's children list.Fixes #172188
Pre-launch Checklist