Make sure that a DraggableScrollableSheet doesn't crash in 0x0 enviro… #180433
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This pull request adds a regression test to prevent a crash in DraggableScrollableSheet when it's placed in a zero-sized environment. The added test is a good starting point. My review includes a suggestion to make the test more robust by simulating a drag gesture, which was the trigger for the original crash. This ensures the fix is properly exercised.
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| testWidgets('DraggableScrollableSheet does not crash at zero area', ( | ||
| WidgetTester tester, | ||
| ) async { | ||
| await tester.pumpWidget( | ||
| Directionality( | ||
| textDirection: TextDirection.ltr, | ||
| child: Center( | ||
| child: SizedBox.shrink( | ||
| child: DraggableScrollableSheet(builder: (_, _) => Text('X')), | ||
| ), | ||
| ), | ||
| ), | ||
| ); | ||
| expect(tester.getSize(find.byType(DraggableScrollableSheet)), Size.zero); | ||
| }); |
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This test case is intended to prevent a regression of a crash that occurs when dragging a DraggableScrollableSheet in a zero-sized environment. However, the current implementation doesn't actually perform a drag action, nor does it correctly set up the sheet to be draggable.
To make the test more robust and accurately reflect the scenario it's meant to cover, you should:
- Update the
builderto use the providedScrollController. AListViewis a good choice for this. - Add a drag gesture to the test to trigger the code path that was causing the crash.
- Update the test description to reflect that it's testing a drag action.
testWidgets('DraggableScrollableSheet does not crash when dragged at zero area', (
WidgetTester tester,
) async {
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Center(
child: SizedBox.shrink(
child: DraggableScrollableSheet(
builder: (BuildContext context, ScrollController scrollController) {
return ListView(controller: scrollController);
},
),
),
),
),
);
expect(tester.getSize(find.byType(DraggableScrollableSheet)), Size.zero);
// Attempt to drag the sheet to trigger the crash if the fix is not present.
await tester.drag(find.byType(ListView), const Offset(0.0, -100.0));
await tester.pump();
// No crash means the test passes. The size should still be zero.
expect(tester.getSize(find.byType(DraggableScrollableSheet)), Size.zero);
});
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This is my attempt to handle #6537 for the DraggableScrollableSheet widget.