Make sure that a ReorderableListView doesn't crash in 0x0 environment #177646
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This pull request adds a regression test for an issue where ReorderableListView crashes in a zero-sized environment. The added test verifies that the widget can be built with zero size, but it doesn't cover the drag interaction that was reported to cause the crash. I've suggested an improved test that simulates a drag while the widget's size is animated to zero, which more accurately reflects the problematic scenario.
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| testWidgets('ReorderableListView does not crash at zero area', (WidgetTester tester) async { | ||
| await tester.pumpWidget( | ||
| MaterialApp( | ||
| home: Center( | ||
| child: SizedBox.shrink( | ||
| child: ReorderableListView( | ||
| children: const <Widget>[ | ||
| Text(key: Key('x'), 'X'), | ||
| Text(key: Key('y'), 'Y'), | ||
| ], | ||
| onReorder: (_, _) {}, | ||
| ), | ||
| ), | ||
| ), | ||
| ), | ||
| ); | ||
| expect(tester.getSize(find.byType(ReorderableListView)), Size.zero); | ||
| }); |
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This test only verifies that ReorderableListView can be built with a zero size. It doesn't test the drag interaction described in issue #6537 that causes the crash. To properly cover the issue, the test should simulate a drag on the ReorderableListView while its size is being reduced to zero.
testWidgets('ReorderableListView does not crash at zero area during drag', (WidgetTester tester) async {
// Start with a non-zero size to allow starting a drag.
await tester.pumpWidget(
MaterialApp(
home: Center(
child: SizedBox(
width: 200,
height: 200,
child: ReorderableListView(
children: const <Widget>[
SizedBox(key: Key('x'), height: 50, child: Text('X')),
SizedBox(key: Key('y'), height: 50, child: Text('Y')),
],
onReorder: (_, __) {},
),
),
),
),
);
final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byKey(const Key('x'))));
await tester.pump(kLongPressTimeout); // Start the drag.
// Animate size to zero while dragging.
await tester.pumpWidget(
MaterialApp(
home: Center(
child: SizedBox.shrink(
child: ReorderableListView(
children: const <Widget>[
SizedBox(key: Key('x'), height: 50, child: Text('X')),
SizedBox(key: Key('y'), height: 50, child: Text('Y')),
],
onReorder: (_, __) {},
),
),
),
),
);
// Move the gesture and settle. This should not crash.
await gesture.moveBy(const Offset(0, 10));
await tester.pumpAndSettle();
await gesture.up();
expect(tester.takeException(), isNull);
});
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Applying this gives me:
Drag target size is larger than scrollable size, which may cause bouncing
'package:flutter/src/widgets/scrollable_helpers.dart':
Failed assertion: line 241 pos 7: '(globalRect.size.width + precisionErrorTolerance) >=
transformedDragTarget.size.width &&
(globalRect.size.height + precisionErrorTolerance) >= transformedDragTarget.size.height'
Contributor
|
I don't think it's possible to verify the dragging behavior at zero size. We might be able to do it with a small size (such as 1x1, which is effectively almost equivalent. Although, I'm willing to delay it to another day until it's actually found broken due to its potential difficulty, but feel free to give it a try if you'd like to. |
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autosubmit label was removed for flutter/flutter/177646, 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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…flutter#177646) This is my attempt to handle flutter#6537 for the ReorderableListView widget. Co-authored-by: Victor Sanni <[email protected]>
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…flutter#177646) This is my attempt to handle flutter#6537 for the ReorderableListView widget. Co-authored-by: Victor Sanni <[email protected]>
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…flutter#177646) This is my attempt to handle flutter#6537 for the ReorderableListView widget. Co-authored-by: Victor Sanni <[email protected]>
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…flutter#177646) This is my attempt to handle flutter#6537 for the ReorderableListView widget. Co-authored-by: Victor Sanni <[email protected]>
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This is my attempt to handle #6537 for the ReorderableListView widget.