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#48 viewer: parallax effect when scrolling

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This commit is contained in:
Thibault Deckers 2021-06-28 09:28:57 +09:00
parent 1841c60c09
commit dc4db4c4e3
1 changed files with 20 additions and 1 deletions
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21
lib/widgets/viewer/entry_horizontal_pager.dart
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@ -29,6 +29,8 @@ class MultiEntryScroller extends StatefulWidget {
class _MultiEntryScrollerState extends State<MultiEntryScroller> with AutomaticKeepAliveClientMixin {
List<AvesEntry> get entries => widget.collection.sortedEntries;
PageController get pageController => widget.pageController;
@override
Widget build(BuildContext context) {
super.build(context);
@ -38,7 +40,7 @@ class _MultiEntryScrollerState extends State<MultiEntryScroller> with AutomaticK
child: PageView.builder(
key: const Key('horizontal-pageview'),
scrollDirection: Axis.horizontal,
controller: widget.pageController,
controller: pageController,
physics: const MagnifierScrollerPhysics(parent: BouncingScrollPhysics()),
onPageChanged: widget.onPageChanged,
itemBuilder: (context, index) {
@ -64,6 +66,23 @@ class _MultiEntryScrollerState extends State<MultiEntryScroller> with AutomaticK
}
child ??= _buildViewer(entry);
child = AnimatedBuilder(
animation: pageController,
builder: (context, child) {
// parallax scrolling
double dx = 0;
if (pageController.hasClients && pageController.position.haveDimensions) {
final delta = pageController.page! - index;
dx = delta * pageController.position.viewportDimension / 2;
}
return Transform.translate(
offset: Offset(dx, 0),
child: child,
);
},
child: child,
);
return ClipRect(
child: child,
);