Add menuController to DropdownMenu
#175039
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This pull request adds a menuController to the DropdownMenu widget, allowing for external control over its state. The implementation, however, introduces a memory leak when switching between an internally managed and an externally provided MenuController. The internally created controller is not disposed of correctly. I've left a detailed comment with a suggested fix to address this lifecycle issue. It would also be beneficial to add a test case that covers the controller's lifecycle, specifically when switching between internal and external controllers, to prevent future regressions.
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| if (oldWidget.menuController != widget.menuController) { | ||
| _controller = widget.menuController ?? MenuController(); | ||
| } |
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This logic introduces a memory leak. If an internal MenuController was created (when widget.menuController was null), and then the widget is updated with an external controller, the internal one is never disposed.
To fix this, you should manage the lifecycle of the internal controller, similar to how _localTextEditingController is handled in this class. This involves these changes:
-
In
_DropdownMenuState, replacelate MenuController _controller;with:MenuController? _localMenuController; MenuController get _controller => widget.menuController ?? (_localMenuController ??= MenuController());
-
In
initState, remove the line_controller = widget.menuController ?? MenuController();. -
In
dispose, add_localMenuController?.dispose();. -
Replace the current logic in
didUpdateWidgetwith the following to handle controller disposal:
if (widget.menuController != oldWidget.menuController) {
_localMenuController?.dispose();
_localMenuController = null;
}
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MenuController doesn't have a dispose method 😓
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Ha you're right. I was going to make the same complaint as Gemini 😊 .
justinmc
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Sep 17, 2025
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| if (oldWidget.menuController != widget.menuController) { | ||
| _controller = widget.menuController ?? MenuController(); | ||
| } |
Contributor
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Ha you're right. I was going to make the same complaint as Gemini 😊 .
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autosubmit label was removed for flutter/flutter/175039, because The base commit of the PR is older than 7 days and can not be merged. Please merge the latest changes from the main into this branch and resubmit the PR. |
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Roll Flutter from 8f94cb0d8f01 to 9ff2767f3cb6 (56 revisions) flutter/flutter@8f94cb0...9ff2767 2025-09-20 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from 0_jKqLGnkILvQ5C8a... to CcCe3HpQtBYhTZscb... (flutter/flutter#175698) 2025-09-20 engine-flutter-autoroll@skia.org Roll Dart SDK from e6e9248aee4f to 9e943fe076c8 (1 revision) (flutter/flutter#175697) 2025-09-20 32538273+ValentinVignal@users.noreply.github.com Add `menuController` to `DropdownMenu` (flutter/flutter#175039) 2025-09-20 engine-flutter-autoroll@skia.org Roll Skia from 1dae085e2f31 to a38a531dec1d (3 revisions) (flutter/flutter#175694) 2025-09-20 bruno.leroux@gmail.com [a11y] TimePicker clock is unnecessarily announced (flutter/flutter#175570) 2025-09-20 engine-flutter-autoroll@skia.org Roll Dart SDK from 78e68d1a7dbf to e6e9248aee4f (4 revisions) (flutter/flutter#175690) 2025-09-19 engine-flutter-autoroll@skia.org Roll Skia from b56003bf2c20 to 1dae085e2f31 (1 revision) (flutter/flutter#175674) 2025-09-19 matanlurey@users.noreply.github.com Update `CODEOWNERS` (for dev-tooling) (flutter/flutter#175201) 2025-09-19 sokolovskyi.konstantin@gmail.com [a11y-app] Add label to TextFormField in AutoCompleteUseCase. (flutter/flutter#175576) 2025-09-19 sokolovskyi.konstantin@gmail.com Fix RadioGroup single selection check. (flutter/flutter#175654) 2025-09-19 engine-flutter-autoroll@skia.org Roll Packages from f2a65fd to 3d5c419 (2 revisions) (flutter/flutter#175668) 2025-09-19 engine-flutter-autoroll@skia.org Roll Skia from c74d2bdbd93c to b56003bf2c20 (2 revisions) (flutter/flutter#175665) 2025-09-19 32538273+ValentinVignal@users.noreply.github.com Add `CupertinoLinearActivityIndicator` (flutter/flutter#170108) 2025-09-19 bkonyi@google.com [ Widget Preview ] Don't update filtered preview set when selecting non-source files (flutter/flutter#175596) 2025-09-19 engine-flutter-autoroll@skia.org Roll Dart SDK from 2c79803c97db to 78e68d1a7dbf (3 revisions) (flutter/flutter#175646) 2025-09-19 mdebbar@google.com Delete unused web_unicode library (flutter/flutter#174896) 2025-09-19 engine-flutter-autoroll@skia.org Roll Skia from 684f3a831216 to c74d2bdbd93c (2 revisions) (flutter/flutter#175644) 2025-09-19 engine-flutter-autoroll@skia.org Roll Skia from 462bdece17bf to 684f3a831216 (3 revisions) (flutter/flutter#175641) 2025-09-19 engine-flutter-autoroll@skia.org Roll Skia from a2c38aa9df80 to 462bdece17bf (11 revisions) (flutter/flutter#175629) 2025-09-18 1961493+harryterkelsen@users.noreply.github.com fix(tool): Use merge-base for content hash in detached HEAD (flutter/flutter#175554) 2025-09-18 1961493+harryterkelsen@users.noreply.github.com [web] Unskip Cupertino datepicker golden tests in Skwasm (flutter/flutter#174666) 2025-09-18 ryjohn@google.com Update rules to include extension rules (flutter/flutter#175618) 2025-09-18 Breakthrough@users.noreply.github.com [engine] Cleanup Fuchsia FDIO library dependencies (flutter/flutter#174847) 2025-09-18 ahmedsameha1@gmail.com Make sure that a CloseButton doesn't crash in 0x0 environment (flutter/flutter#172902) 2025-09-18 bkonyi@google.com [ Tool ] Serve DevTools from DDS, remove ResidentDevToolsHandler (flutter/flutter#174580) 2025-09-18 Breakthrough@users.noreply.github.com [engine][fuchsia] Update to Fuchsia API level 28 and roll latest GN SDK (flutter/flutter#175425) 2025-09-18 jessiewong401@gmail.com Added a 36 device for Firebase Lab Testing (flutter/flutter#175613) 2025-09-18 engine-flutter-autoroll@skia.org Roll Dart SDK from 09a101793af4 to 2c79803c97db (2 revisions) (flutter/flutter#175608) 2025-09-18 louisehsu@google.com Engine Support for Dynamic View Resizing (flutter/flutter#173610) 2025-09-18 engine-flutter-autoroll@skia.org Roll Packages from fdee698 to f2a65fd (3 revisions) (flutter/flutter#175594) 2025-09-18 15619084+vashworth@users.noreply.github.com Connect the FlutterEngine to the FlutterSceneDelegate (flutter/flutter#174910) 2025-09-18 engine-flutter-autoroll@skia.org Roll Dart SDK from de5dd0f1530f to 09a101793af4 (2 revisions) (flutter/flutter#175583) 2025-09-18 engine-flutter-autoroll@skia.org Roll Skia from 7b9fe91446ee to a2c38aa9df80 (1 revision) (flutter/flutter#175579) 2025-09-18 engine-flutter-autoroll@skia.org Roll Skia from ab1b10547461 to 7b9fe91446ee (4 revisions) (flutter/flutter#175569) 2025-09-18 bruno.leroux@gmail.com [a11y-app] Fix form field label and error message (flutter/flutter#174831) 2025-09-18 bruno.leroux@gmail.com Fix InputDecoration does not apply errorStyle to error (flutter/flutter#174787) 2025-09-18 32538273+ValentinVignal@users.noreply.github.com Migrate to `WidgetPropertyResolver` (flutter/flutter#175397) 2025-09-18 32538273+ValentinVignal@users.noreply.github.com Migrate to WidgetState (flutter/flutter#175396) 2025-09-18 engine-flutter-autoroll@skia.org Roll Skia from 79ec8dfcd9d4 to ab1b10547461 (17 revisions) (flutter/flutter#175561) 2025-09-18 30870216+gaaclarke@users.noreply.github.com Removes NOTICES from licenses input (flutter/flutter#174967) 2025-09-18 engine-flutter-autoroll@skia.org Roll Dart SDK from 116f7fe72839 to de5dd0f1530f (2 revisions) (flutter/flutter#175557) 2025-09-17 1961493+harryterkelsen@users.noreply.github.com [reland][web] Refactor renderers to use the same frontend code #174588 (flutter/flutter#175392) 2025-09-17 erickzanardoo@gmail.com feat: Enable WidgetStateColor to be used in ChipThemeData.deleteIconColor (flutter/flutter#171646) 2025-09-17 15619084+vashworth@users.noreply.github.com Filter out unexpected process logs on iOS with better regex matching. (flutter/flutter#175452) 2025-09-17 victorsanniay@gmail.com CupertinoContextMenu child respects available screen width (flutter/flutter#175300) 2025-09-17 38427679+xVemu@users.noreply.github.com Correct documentation in PredictiveBackFullscreenPageTransitionsBuilder (flutter/flutter#174362) ...
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Fixes flutter#174780 ## 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. - [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
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Fixes #174780
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
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