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Fix Carousel crashes when using PageStorageKey #166817

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Merged
merged 1 commit into from
Apr 16, 2025
Merged

Fix Carousel crashes when using PageStorageKey #166817

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2 changes: 1 addition & 1 deletion packages/flutter/lib/src/material/carousel.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -1491,7 +1491,7 @@ class _CarouselPosition extends ScrollPositionWithSingleContext implements _Caro
// If resize from zero, we should use the _cachedItem to recover the state.
item = _cachedItem!;
} else {
item = getItemFromPixels(oldPixels, oldViewportDimensions!);
item = getItemFromPixels(oldPixels, oldViewportDimensions ?? viewportDimension);
}
final double newPixels = getPixelsFromItem(item, flexWeights, itemExtent);
// If the viewportDimension is zero, cache the item
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41 changes: 41 additions & 0 deletions packages/flutter/test/material/carousel_test.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -1433,6 +1433,47 @@ void main() {
expect(tester.takeException(), isNull);
});

// Regression test for https://github.com/flutter/flutter/issues/166067.
testWidgets('CarouselView should not crash when using PageStorageKey', (
WidgetTester tester,
) async {
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: NestedScrollView(
headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
return const <Widget>[SliverAppBar()];
},
body: CustomScrollView(
key: const PageStorageKey<String>('key1'),
slivers: <Widget>[
SliverToBoxAdapter(
child: ConstrainedBox(
constraints: const BoxConstraints(maxHeight: 50),
child: CarouselView.weighted(
flexWeights: const <int>[1, 2],
consumeMaxWeight: false,
children: List<Widget>.generate(20, (int index) {
return ColoredBox(
color: Colors.primaries[index % Colors.primaries.length].withValues(
alpha: 0.8,
),
child: const SizedBox.expand(),
);
}),
),
),
),
],
),
),
),
),
);

expect(tester.takeException(), isNull);
});

group('CarouselController.animateToItem', () {
testWidgets('CarouselView.weighted horizontal, not reversed, flexWeights [7,1]', (
WidgetTester tester,
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