initial commit

lib/components/scroll.dart

@@ -0,0 +1,100 @@
+part of 'components.dart';
+
+class SmoothCustomScrollView extends StatelessWidget {
+  const SmoothCustomScrollView({super.key, required this.slivers, this.controller});
+
+  final ScrollController? controller;
+
+  final List<Widget> slivers;
+
+  @override
+  Widget build(BuildContext context) {
+    return SmoothScrollProvider(
+      controller: controller,
+      builder: (context, controller, physics) {
+        return CustomScrollView(
+          controller: controller,
+          physics: physics,
+          slivers: slivers,
+        );
+      },
+    );
+  }
+}
+
+
+class SmoothScrollProvider extends StatefulWidget {
+  const SmoothScrollProvider({super.key, this.controller, required this.builder});
+
+  final ScrollController? controller;
+
+  final Widget Function(BuildContext, ScrollController, ScrollPhysics) builder;
+
+  static bool get isMouseScroll => _SmoothScrollProviderState._isMouseScroll;
+
+  @override
+  State<SmoothScrollProvider> createState() => _SmoothScrollProviderState();
+}
+
+class _SmoothScrollProviderState extends State<SmoothScrollProvider> {
+  late final ScrollController _controller;
+
+  double? _futurePosition;
+
+  static bool _isMouseScroll = App.isDesktop;
+
+  @override
+  void initState() {
+    _controller = widget.controller ?? ScrollController();
+    super.initState();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if(App.isMacOS) {
+      return widget.builder(
+        context,
+        _controller,
+        const ClampingScrollPhysics(),
+      );
+    }
+    return Listener(
+      behavior: HitTestBehavior.translucent,
+      onPointerDown: (event) {
+        if (_isMouseScroll) {
+          setState(() {
+            _isMouseScroll = false;
+          });
+        }
+      },
+      onPointerSignal: (pointerSignal) {
+        if (pointerSignal is PointerScrollEvent) {
+          if (pointerSignal.kind == PointerDeviceKind.mouse &&
+              !_isMouseScroll) {
+            setState(() {
+              _isMouseScroll = true;
+            });
+          }
+          if (!_isMouseScroll) return;
+          var currentLocation = _controller.position.pixels;
+          _futurePosition ??= currentLocation;
+          double k = (_futurePosition! - currentLocation).abs() / 1600 + 1;
+          _futurePosition =
+              _futurePosition! + pointerSignal.scrollDelta.dy * k;
+          _futurePosition = _futurePosition!.clamp(
+              _controller.position.minScrollExtent,
+              _controller.position.maxScrollExtent);
+          _controller.animateTo(_futurePosition!,
+              duration: _fastAnimationDuration, curve: Curves.linear);
+        }
+      },
+      child: widget.builder(
+        context,
+        _controller,
+        _isMouseScroll
+            ? const NeverScrollableScrollPhysics()
+            : const ClampingScrollPhysics(),
+      ),
+    );
+  }
+}