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fix: retain scroll position on scale update (#22237)

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Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>
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shenlong 2025-09-22 01:12:30 +05:30 committed by GitHub
parent 6609e70fa8
commit a582d3a03e
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1 changed files with 44 additions and 1 deletions
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45
mobile/lib/presentation/widgets/timeline/timeline.widget.dart
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@ -107,7 +107,7 @@ class _SliverTimeline extends ConsumerStatefulWidget {
}
class _SliverTimelineState extends ConsumerState<_SliverTimeline> {
final _scrollController = ScrollController();
late final ScrollController _scrollController;
StreamSubscription? _eventSubscription;
// Drag selection state
@ -119,10 +119,12 @@ class _SliverTimelineState extends ConsumerState<_SliverTimeline> {
int _perRow = 4;
double _scaleFactor = 3.0;
double _baseScaleFactor = 3.0;
int? _scaleRestoreAssetIndex;
@override
void initState() {
super.initState();
_scrollController = ScrollController(onAttach: _restoreScalePosition);
_eventSubscription = EventStream.shared.listen(_onEvent);
final currentTilesPerRow = ref.read(settingsProvider).get(Setting.tilesPerRow);
@ -154,6 +156,28 @@ class _SliverTimelineState extends ConsumerState<_SliverTimeline> {
EventStream.shared.emit(MultiSelectToggleEvent(isEnabled));
}
void _restoreScalePosition(_) {
if (_scaleRestoreAssetIndex == null) return;
final asyncSegments = ref.read(timelineSegmentProvider);
asyncSegments.whenData((segments) {
final targetSegment = segments.lastWhereOrNull((segment) => segment.firstAssetIndex <= _scaleRestoreAssetIndex!);
if (targetSegment != null) {
final assetIndexInSegment = _scaleRestoreAssetIndex! - targetSegment.firstAssetIndex;
final newColumnCount = ref.read(timelineArgsProvider).columnCount;
final rowIndexInSegment = (assetIndexInSegment / newColumnCount).floor();
final targetRowIndex = targetSegment.firstIndex + 1 + rowIndexInSegment;
final targetOffset = targetSegment.indexToLayoutOffset(targetRowIndex);
WidgetsBinding.instance.addPostFrameCallback((_) {
if (mounted) {
_scrollController.jumpTo(targetOffset.clamp(0.0, _scrollController.position.maxScrollExtent));
}
});
}
});
_scaleRestoreAssetIndex = null;
}
@override
void dispose() {
_scrollController.dispose();
@ -345,9 +369,28 @@ class _SliverTimelineState extends ConsumerState<_SliverTimeline> {
final newPerRow = 7 - newScaleFactor.toInt();
if (newPerRow != _perRow) {
final currentOffset = _scrollController.offset.clamp(
0.0,
_scrollController.position.maxScrollExtent,
);
final segment = segments.findByOffset(currentOffset) ?? segments.lastOrNull;
int? targetAssetIndex;
if (segment != null) {
final rowIndex = segment.getMinChildIndexForScrollOffset(currentOffset);
if (rowIndex > segment.firstIndex) {
final rowIndexInSegment = rowIndex - (segment.firstIndex + 1);
final assetsPerRow = ref.read(timelineArgsProvider).columnCount;
final assetIndexInSegment = rowIndexInSegment * assetsPerRow;
targetAssetIndex = segment.firstAssetIndex + assetIndexInSegment;
} else {
targetAssetIndex = segment.firstAssetIndex;
}
}
setState(() {
_scaleFactor = newScaleFactor;
_perRow = newPerRow;
_scaleRestoreAssetIndex = targetAssetIndex;
});
ref.read(settingsProvider.notifier).set(Setting.tilesPerRow, _perRow);