Update ExpansibleController in ExpansionTile didUpdateWidget
#173175
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ValentinVignal
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Aug 3, 2025
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| if (widget.controller != oldWidget.controller) { | ||
| _tileController.removeListener(_onExpansionChanged); | ||
| if (oldWidget.controller == null) { | ||
| _tileController.dispose(); | ||
| } | ||
|
|
||
| _tileController = widget.controller ?? ExpansibleController(); | ||
| _tileController.addListener(_onExpansionChanged); | ||
| } | ||
| } |
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What if the new controller doesn't have the same state as the previous one? For example, oldWidget.controller.isExpanded could be true while widget.controller.isExpanded is false.
What do you think is the best to do here?
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I think Expansible will handle the close and open ?
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Are you suggesting that if the new controller has a different state, the widget should update its expanded/collapsed state to reflect that?
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Are you suggesting that if the new controller has a different state, the widget should update its expanded/collapsed state to reflect that?
I think so. Are there any possible drawbacks to this approach?
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Are you suggesting that if the new controller has a different state, the widget should update its expanded/collapsed state to reflect that?
Yes, and the underlying Expansible should have handled it if it receives a different controller.
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Sorry @chunhtai I realised I missunderstood what you were saying.
I had to update Expansible for that in Make Expansible support a new state from a new controller
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Code Review
This pull request updates ExpansionTile to handle changes to its ExpansibleController in didUpdateWidget. The changes correctly swap the controller and manage listeners. However, there's a critical issue where the visual state of the tile doesn't sync with the new controller's state, leading to UI inconsistencies. The new test case is a good start but doesn't cover the scenario where controllers with different expansion states are swapped. I've provided a more robust test case to highlight this issue and suggest a path for a complete fix.
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| testWidgets('ExpansionTile can accept a new controller', (WidgetTester tester) async { | ||
| final ExpansibleController controller1 = ExpansibleController(); | ||
| final ExpansibleController controller2 = ExpansibleController(); | ||
| addTearDown(() { | ||
| controller1.dispose(); | ||
| controller2.dispose(); | ||
| }); | ||
|
|
||
| await tester.pumpWidget( | ||
| MaterialApp( | ||
| home: Material( | ||
| child: ExpansionTile( | ||
| controller: controller1, | ||
| title: const Text('Title'), | ||
| initiallyExpanded: true, | ||
| children: const <Widget>[Text('Child 0')], | ||
| ), | ||
| ), | ||
| ), | ||
| ); | ||
|
|
||
| expect(find.text('Child 0'), findsOne); | ||
| expect(controller1.isExpanded, isTrue); | ||
| controller1.collapse(); | ||
| expect(controller1.isExpanded, isFalse); | ||
| await tester.pumpAndSettle(); | ||
| expect(find.text('Child 0'), findsNothing); | ||
|
|
||
| await tester.pumpWidget( | ||
| MaterialApp( | ||
| home: Material( | ||
| child: ExpansionTile( | ||
| controller: controller2, | ||
| title: const Text('Title'), | ||
| initiallyExpanded: true, | ||
| children: const <Widget>[Text('Child 0')], | ||
| ), | ||
| ), | ||
| ), | ||
| ); | ||
|
|
||
| expect(find.text('Child 0'), findsNothing); | ||
| controller2.expand(); | ||
| expect(controller2.isExpanded, isTrue); | ||
| await tester.pumpAndSettle(); | ||
| expect(find.text('Child 0'), findsOne); | ||
| }); |
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This test case is a good start, but it doesn't cover the scenario where the old and new controllers have different expansion states. Currently, you collapse controller1 before switching, so both controllers are in a collapsed state, hiding a potential bug.
The implementation in didUpdateWidget correctly swaps the controller, but it doesn't synchronize the visual state of the ExpansionTile with the new controller's state. This can lead to inconsistencies. For example, if you switch from an expanded controller to a collapsed one, the tile remains visually expanded.
Here is an updated test that exposes this issue by switching from an expanded controller to a collapsed one. This test will fail with the current implementation and ensure the fix is complete.
The fix for this likely needs to be in _ExpansibleState.didUpdateWidget (in packages/flutter/lib/src/widgets/expansible.dart), where the AnimationController's value should be synchronized with the new ExpansibleController's isExpanded state.
testWidgets('ExpansionTile can accept a new controller and syncs state', (WidgetTester tester) async {
final ExpansibleController controller1 = ExpansibleController();
final ExpansibleController controller2 = ExpansibleController();
addTearDown(() {
controller1.dispose();
controller2.dispose();
});
await tester.pumpWidget(
MaterialApp(
home: Material(
child: ExpansionTile(
controller: controller1,
title: const Text('Title'),
initiallyExpanded: true,
children: const <Widget>[Text('Child 0')],
),
),
),
);
expect(find.text('Child 0'), findsOneWidget);
expect(controller1.isExpanded, isTrue);
// Rebuild with the new controller, which is collapsed by default.
// The tile should now reflect the state of controller2 and be collapsed.
await tester.pumpWidget(
MaterialApp(
home: Material(
child: ExpansionTile(
controller: controller2,
title: const Text('Title'),
initiallyExpanded: true, // This should have no effect on update.
children: const <Widget>[Text('Child 0')],
),
),
),
);
// The tile should be collapsed to match the new controller's state.
expect(find.text('Child 0'), findsNothing);
expect(controller2.isExpanded, isFalse);
// Verify that the new controller works as expected.
controller2.expand();
expect(controller2.isExpanded, isTrue);
await tester.pumpAndSettle();
expect(find.text('Child 0'), findsOneWidget);
});
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+1 here, this test fails with the current changes in this PR.
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Yes, that is the scenario I was talking about in #173175 (comment)
chunhtai
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Aug 4, 2025
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LGTM once the gemini's comment is addressed
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| if (widget.controller != oldWidget.controller) { | ||
| _tileController.removeListener(_onExpansionChanged); | ||
| if (oldWidget.controller == null) { | ||
| _tileController.dispose(); | ||
| } | ||
|
|
||
| _tileController = widget.controller ?? ExpansibleController(); | ||
| _tileController.addListener(_onExpansionChanged); | ||
| } | ||
| } |
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I think Expansible will handle the close and open ?
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…lutter#173175) Fixes flutter#138916 ## 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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…lutter#173175) Fixes flutter#138916 ## 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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…lutter#173175) Fixes flutter#138916 ## 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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…lutter#173175) Fixes flutter#138916 ## 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 #138916
Pre-launch Checklist
///).If you need help, consider asking for advice on the #hackers-new channel on Discord.
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