opt iOS ScrollPhysics

Signed-off-by: dom <githubaccount56556@proton.me>

lib/common/widgets/flutter/refresh_indicator.dart

@@ -5,9 +5,11 @@
 // ignore_for_file: prefer_initializing_formals
 
 import 'dart:async' show Completer;
-import 'dart:io' show Platform;
 
 import 'package:PiliPlus/common/widgets/scroll_behavior.dart';
+import 'package:PiliPlus/common/widgets/scroll_physics.dart'
+    show BouncingScrollPhysicsExt;
+import 'package:PiliPlus/utils/platform_utils.dart';
 import 'package:PiliPlus/utils/storage_pref.dart';
 import 'package:extended_nested_scroll_view/src/refresh.dart';
 import 'package:flutter/foundation.dart' show clampDouble;
@@ -543,8 +545,19 @@ class RefreshIndicatorState extends State<RefreshIndicator>
           ),
       ],
     );
-    if (!widget.isClampingScrollPhysics &&
-        (Platform.isIOS || Platform.isMacOS)) {
+    if (PlatformUtils.isDarwin) {
+      if (widget.isClampingScrollPhysics) {
+        return ScrollConfiguration(
+          behavior: RefreshScrollBehavior(
+            desktopDragDevices,
+            scrollPhysics: RefreshScrollPhysicsIOS(
+              parent: const RangeMaintainingScrollPhysics(),
+              onDrag: _onDrag,
+            ),
+          ),
+          child: child,
+        );
+      }
       return child;
     }
     return ScrollConfiguration(
@@ -640,3 +653,19 @@ class RefreshScrollPhysics extends ClampingScrollPhysics
     return RefreshScrollPhysics(parent: buildParent(ancestor), onDrag: onDrag);
   }
 }
+
+class RefreshScrollPhysicsIOS extends BouncingScrollPhysicsExt
+    with RefreshScrollPhysicsMixin {
+  const RefreshScrollPhysicsIOS({super.parent, required this.onDrag});
+
+  @override
+  final OnDrag onDrag;
+
+  @override
+  RefreshScrollPhysicsIOS applyTo(ScrollPhysics? ancestor) {
+    return RefreshScrollPhysicsIOS(
+      parent: buildParent(ancestor),
+      onDrag: onDrag,
+    );
+  }
+}

lib/common/widgets/scroll_physics.dart

@@ -1,5 +1,6 @@
 import 'package:PiliPlus/common/widgets/flutter/page/tabs.dart';
 import 'package:PiliPlus/common/widgets/gesture/horizontal_drag_gesture_recognizer.dart';
+import 'package:PiliPlus/utils/platform_utils.dart';
 import 'package:PiliPlus/utils/storage_pref.dart';
 import 'package:flutter/material.dart' hide TabBarView;
 
@@ -76,3 +77,49 @@ class ReloadScrollPhysics extends AlwaysScrollableScrollPhysics {
     );
   }
 }
+
+final platformClampingPhysics = PlatformUtils.isDarwin
+    ? const BouncingScrollPhysicsExt()
+    : const ClampingScrollPhysics();
+
+final platformAlwaysClampingPhysics = PlatformUtils.isDarwin
+    ? const AlwaysScrollableScrollPhysics(parent: BouncingScrollPhysicsExt())
+    : const AlwaysScrollableScrollPhysics(parent: ClampingScrollPhysics());
+
+class BouncingScrollPhysicsExt extends BouncingScrollPhysics
+    with ClampingBoundaryMixin {
+  const BouncingScrollPhysicsExt({super.parent});
+
+  @override
+  BouncingScrollPhysicsExt applyTo(ScrollPhysics? ancestor) {
+    return BouncingScrollPhysicsExt(parent: buildParent(ancestor));
+  }
+}
+
+/// [ClampingScrollPhysics.applyBoundaryConditions]
+mixin ClampingBoundaryMixin on ScrollPhysics {
+  @override
+  double applyBoundaryConditions(ScrollMetrics position, double value) {
+    if (value < position.pixels &&
+        position.pixels <= position.minScrollExtent) {
+      // Underscroll.
+      return value - position.pixels;
+    }
+    if (position.maxScrollExtent <= position.pixels &&
+        position.pixels < value) {
+      // Overscroll.
+      return value - position.pixels;
+    }
+    if (value < position.minScrollExtent &&
+        position.minScrollExtent < position.pixels) {
+      // Hit top edge.
+      return value - position.minScrollExtent;
+    }
+    if (position.pixels < position.maxScrollExtent &&
+        position.maxScrollExtent < value) {
+      // Hit bottom edge.
+      return value - position.maxScrollExtent;
+    }
+    return 0.0;
+  }
+}