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[scrollable_positioned_list] Fix manual scrolling accuracy. #469

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tarobins merged 2 commits into from
May 2, 2023
Merged

[scrollable_positioned_list] Fix manual scrolling accuracy. #469

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5726025
[scrollable_positioned_list] Fix manual scrolling accuracy.
tarobins May 2, 2023
503365c
Fix formatting
tarobins May 2, 2023
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5 changes: 2 additions & 3 deletions packages/scrollable_positioned_list/lib/src/scrollable_positioned_list.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -338,9 +338,8 @@ class _ScrollablePositionedListState extends State<ScrollablePositionedList>
return LayoutBuilder(
builder: (context, constraints) {
final cacheExtent = _cacheExtent(constraints);
return GestureDetector(
onPanDown: (_) => _stopScroll(canceled: true),
excludeFromSemantics: true,
return Listener(
onPointerDown: (_) => _stopScroll(canceled: true),
child: Stack(
children: <Widget>[
PostMountCallback(
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19 changes: 19 additions & 0 deletions packages/scrollable_positioned_list/test/scrollable_positioned_list_test.dart
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Expand Up @@ -2266,6 +2266,25 @@ void main() {
expect(find.text('Item 70'), findsOneWidget);
expect(find.text('Item 50'), findsOneWidget);
});

testWidgets(
'List positioned with 5 at top then scroll up so item 3 is at top',
(WidgetTester tester) async {
// debugPrintGestureArenaDiagnostics = true;
final itemPositionsListener = ItemPositionsListener.create();
await setUpWidgetTest(tester,
initialIndex: 5, itemPositionsListener: itemPositionsListener);

await tester.drag(
find.byType(ScrollablePositionedList), const Offset(0, 2 * itemHeight));
await tester.pumpAndSettle();

expect(
itemPositionsListener.itemPositions.value
.firstWhere((position) => position.index == 3)
.itemLeadingEdge,
0);
});
}

bool collectSemanticNodes(SemanticsNode root, List<SemanticsNode> nodes) {
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