Make sure that GridTile doesn't crash in 0x0 environment #175321
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This pull request aims to prevent GridTile and GridTileBar from crashing when rendered in a zero-sized area by wrapping GridTileBar's content in a LayoutBuilder to make its height responsive to layout constraints. A corresponding test case is added to verify the fix. However, the implementation has a critical flaw where it uses constraints.minHeight instead of constraints.maxHeight to calculate the bar's height. This causes the GridTileBar to have zero height in most standard use cases, effectively making it disappear. I've provided suggestions to correct this logic in both the widget implementation and its new test.
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| height: math.min( | ||
| (title != null && subtitle != null) ? 68.0 : 48.0, | ||
| constraints.minHeight, | ||
| ), |
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Using constraints.minHeight here will cause the GridTileBar to have a height of 0 in its most common use case inside a GridTile. GridTile uses Positioned widgets for its header and footer, which provide loose vertical constraints (minHeight of 0). This results in the bar's height being calculated as math.min(idealHeight, 0.0), which is 0.0, making it invisible.
To correctly respect the available space while maintaining the desired height, you should use constraints.maxHeight. This will allow the bar to take its ideal height when space is available, and shrink to fit when space is constrained.
height: math.min(
(title != null && subtitle != null) ? 68.0 : 48.0,
constraints.maxHeight,
),| ), | ||
| ); | ||
| expect(tester.getSize(find.byType(GridTile)), Size.zero); | ||
| expect(tester.getSize(find.byType(GridTileBar)), Size.zero); |
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This assertion will pass with the current implementation, but the implementation has a flaw that makes the GridTileBar have zero height in normal conditions. After fixing the implementation to use constraints.maxHeight, the GridTileBar will correctly calculate its height. In this test scenario, it's placed in a GridTile constrained to zero width, but with loose vertical constraints. Therefore, its size should be Size(0.0, 68.0) (since it has both a title and subtitle). The test should be updated to assert this correct size.
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| expect(tester.getSize(find.byType(GridTileBar)), Size.zero); | |
| expect(tester.getSize(find.byType(GridTileBar)), const Size(0.0, 68.0)); |
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| ), | ||
| ); | ||
| expect(tester.getSize(find.byType(GridTile)), Size.zero); | ||
| expect(tester.getSize(find.byType(GridTileBar)).isEmpty, isTrue); |
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Can you split GridTileBar into a separate test case so that we can verify its layout in a constraint of exactly zero?
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Checklist:
- The test is in the correct file
- The test name goes “does not crash at zero area”
- The target widget is wrapped by
Center(or is fullscreen) - The target widget does not have an overlay, or the overlay is tested
- The target widget is expected to have a size of exactly
Size.zero
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autosubmit label was removed for flutter/flutter/175321, because This PR has not met approval requirements for merging. The PR author is not a member of flutter-hackers and needs 1 more review(s) in order to merge this PR.
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Roll Flutter from 027f2e410241 to e5d5c01850f2 (73 revisions) flutter/flutter@027f2e4...e5d5c01 2025-11-04 [email protected] [web] Upgrade Chrome to 141 (for engine tests) (flutter/flutter#177743) 2025-11-04 [email protected] Replace deprecated withOpacity in `chip_animation_style.0.dart` example (flutter/flutter#177834) 2025-11-04 [email protected] Roll Skia from 03612114a36d to c89b6118266b (1 revision) (flutter/flutter#177991) 2025-11-04 [email protected] [web] Delete unused futurize util (flutter/flutter#177861) 2025-11-04 [email protected] Roll Skia from 1a179581af75 to 03612114a36d (1 revision) (flutter/flutter#177984) 2025-11-04 [email protected] Roll Skia from 150f844e83fb to 1a179581af75 (3 revisions) (flutter/flutter#177979) 2025-11-04 [email protected] Roll Dart SDK from 6f1bd8d05b1d to 156bf665dba4 (2 revisions) (flutter/flutter#177976) 2025-11-04 [email protected] Roll Skia from 3990fc40acdf to 150f844e83fb (1 revision) (flutter/flutter#177964) 2025-11-04 [email protected] Roll Skia from 85adfd3b8e75 to 3990fc40acdf (1 revision) (flutter/flutter#177962) 2025-11-04 [email protected] Fix `isHeif` crash (flutter/flutter#177944) 2025-11-04 [email protected] Roll Dart SDK from ac065fcd782e to 6f1bd8d05b1d (1 revision) (flutter/flutter#177955) 2025-11-04 [email protected] Roll Skia from 001516d132f0 to 85adfd3b8e75 (4 revisions) (flutter/flutter#177958) 2025-11-04 [email protected] [ Widget Preview ] Add analytic event that's reported when the previewer is opened (flutter/flutter#177949) 2025-11-04 [email protected] Marks Linux_pixel_7pro dynamic_path_stroke_tessellation_perf__timeline_summary to be unflaky (flutter/flutter#171144) 2025-11-03 [email protected] Roll Skia from da9b8fb01101 to 001516d132f0 (6 revisions) (flutter/flutter#177951) 2025-11-03 [email protected] Add FAQ entry about our attempts to remove Skia image codecs. 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) This is my attempt to handle flutter#6537 for the GridTile widget. --------- Co-authored-by: Tong Mu <[email protected]>
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) This is my attempt to handle flutter#6537 for the GridTile widget. --------- Co-authored-by: Tong Mu <[email protected]>
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This is my attempt to handle #6537 for the GridTile widget.