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nearly feature complete, bar dragging down

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This commit is contained in:
Thomas Way
2026-02-05 22:02:33 +00:00
parent 53c5ff1cd7
commit 44284fd7d9
3 changed files with 248 additions and 176 deletions
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mobile/lib/presentation/pages/dev/ui_showcase.page.dart
+100 -61
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@@ -37,77 +37,116 @@ class _ImmichUIShowcasePageState extends State<ImmichUIShowcasePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
body: LayoutBuilder(
builder: (context, constraints) {
final imageHeight = 200.0; // Your image's height
final viewportHeight = constraints.maxHeight;
// Calculate padding to center the image in the viewport
final topPadding = (viewportHeight - imageHeight) / 2;
final snapOffset = topPadding + (imageHeight * 2 / 3);
return SingleChildScrollView(
controller: _scrollController,
physics: SnapToPartialPhysics(snapOffset: snapOffset),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
SizedBox(height: topPadding), // Push image to center
Center(child: Image.asset('assets/immich-logo.png', height: imageHeight)),
Opacity(
opacity: _opacity,
child: Container(
constraints: BoxConstraints(minHeight: snapOffset + 100),
color: Colors.blue,
height: 100 + imageHeight * (1 / 3),
child: const Text('Some content'),
),
),
],
),
);
},
body: StackedScrollView(
bottomPeekHeight: 100,
topChild: Container(
color: Colors.blue,
child: const Center(
child: Text('Top', style: TextStyle(color: Colors.white, fontSize: 32)),
),
),
bottomChild: Container(
height: 800,
decoration: const BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.vertical(top: Radius.circular(24)),
boxShadow: [BoxShadow(color: Colors.black26, blurRadius: 10, offset: Offset(0, -2))],
),
padding: const EdgeInsets.all(24),
child: const Text('Bottom sheet content'),
),
),
);
}
}
class SnapToPartialPhysics extends ScrollPhysics {
final double snapOffset;
class StackedScrollView extends StatefulWidget {
final Widget topChild;
final Widget bottomChild;
final double bottomPeekHeight;
const SnapToPartialPhysics({super.parent, required this.snapOffset});
const StackedScrollView({super.key, required this.topChild, required this.bottomChild, this.bottomPeekHeight = 80});
@override
SnapToPartialPhysics applyTo(ScrollPhysics? ancestor) {
return SnapToPartialPhysics(parent: buildParent(ancestor), snapOffset: snapOffset);
}
@override
Simulation? createBallisticSimulation(ScrollMetrics position, double velocity) {
final tolerance = toleranceFor(position);
// If already at a snap point, let it settle naturally
if ((position.pixels - 0).abs() < tolerance.distance || (position.pixels - snapOffset).abs() < tolerance.distance) {
return super.createBallisticSimulation(position, velocity);
}
// Determine snap target based on position and velocity
double target;
if (velocity > 0) {
// Scrolling down
target = snapOffset;
} else if (velocity < 0) {
// Scrolling up
target = 0;
} else {
// No velocity, snap to nearest
target = position.pixels < snapOffset / 2 ? 0 : snapOffset;
}
return ScrollSpringSimulation(spring, position.pixels, target, velocity, tolerance: tolerance);
}
State<StackedScrollView> createState() => _StackedScrollViewState();
}
class _StackedScrollViewState extends State<StackedScrollView> with SingleTickerProviderStateMixin {
double _offset = 0;
late double _maxOffset;
late AnimationController _controller;
@override
void initState() {
super.initState();
_controller = AnimationController.unbounded(vsync: this)..addListener(_onAnimate);
}
void _onAnimate() {
final clamped = _controller.value.clamp(0.0, _maxOffset);
if (clamped != _offset) {
setState(() => _offset = clamped);
}
// Stop the controller if we've hit a boundary
if (_controller.value <= 0 || _controller.value >= _maxOffset) {
_controller.stop();
}
}
void _onDragUpdate(DragUpdateDetails details) {
_controller.stop();
setState(() {
_offset = (_offset - details.delta.dy).clamp(0.0, _maxOffset);
});
}
void _onDragEnd(DragEndDetails details) {
final velocity = -(details.primaryVelocity ?? 0);
final simulation = ClampingScrollSimulation(position: _offset, velocity: velocity);
_controller.animateWith(simulation);
}
@override
void dispose() {
_controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return LayoutBuilder(
builder: (context, constraints) {
final viewportHeight = constraints.maxHeight;
_maxOffset = viewportHeight - widget.bottomPeekHeight;
return GestureDetector(
behavior: HitTestBehavior.opaque,
onVerticalDragUpdate: _onDragUpdate,
onVerticalDragEnd: _onDragEnd,
child: ClipRect(
child: SizedBox(
height: viewportHeight,
child: Stack(
clipBehavior: Clip.none,
children: [
// Top child — fills the screen, scrolls up
Positioned(top: -_offset, left: 0, right: 0, height: viewportHeight, child: widget.topChild),
// Bottom child — overlaps, peeks from bottom
Positioned(
top: viewportHeight - widget.bottomPeekHeight - _offset,
left: 0,
right: 0,
child: widget.bottomChild,
),
],
),
),
),
);
},
);
}
}
// class _ImmichUIShowcasePageState extends State<ImmichUIShowcasePage> {
// final ScrollController _scrollController = ScrollController();
// double _opacity = 0.0;