opt: load previous data

Closes #597

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

lib/common/widgets/scroll_physics.dart

@@ -0,0 +1,86 @@
+import 'package:PiliPlus/utils/storage.dart';
+import 'package:flutter/material.dart';
+
+Widget videoTabBarView({
+  required List<Widget> children,
+  TabController? controller,
+}) =>
+    TabBarView(
+      physics: const CustomTabBarViewClampingScrollPhysics(),
+      controller: controller,
+      children: children,
+    );
+
+Widget tabBarView({
+  required List<Widget> children,
+  TabController? controller,
+}) =>
+    TabBarView(
+      physics: const CustomTabBarViewScrollPhysics(),
+      controller: controller,
+      children: children,
+    );
+
+class CustomTabBarViewScrollPhysics extends ScrollPhysics {
+  const CustomTabBarViewScrollPhysics({super.parent});
+
+  @override
+  CustomTabBarViewScrollPhysics applyTo(ScrollPhysics? ancestor) {
+    return CustomTabBarViewScrollPhysics(parent: buildParent(ancestor));
+  }
+
+  @override
+  SpringDescription get spring => SpringDescription(
+        mass: GStorage.springDescription[0],
+        stiffness: GStorage.springDescription[1],
+        damping: GStorage.springDescription[2],
+      );
+}
+
+class CustomTabBarViewClampingScrollPhysics extends ClampingScrollPhysics {
+  const CustomTabBarViewClampingScrollPhysics({super.parent});
+
+  @override
+  CustomTabBarViewClampingScrollPhysics applyTo(ScrollPhysics? ancestor) {
+    return CustomTabBarViewClampingScrollPhysics(parent: buildParent(ancestor));
+  }
+
+  @override
+  SpringDescription get spring => SpringDescription(
+        mass: GStorage.springDescription[0],
+        stiffness: GStorage.springDescription[1],
+        damping: GStorage.springDescription[2],
+      );
+}
+
+class PositionRetainedScrollPhysics extends AlwaysScrollableScrollPhysics {
+  const PositionRetainedScrollPhysics({super.parent});
+
+  @override
+  PositionRetainedScrollPhysics applyTo(ScrollPhysics? ancestor) {
+    return PositionRetainedScrollPhysics(parent: buildParent(ancestor));
+  }
+
+  @override
+  double adjustPositionForNewDimensions({
+    required ScrollMetrics oldPosition,
+    required ScrollMetrics newPosition,
+    required bool isScrolling,
+    required double velocity,
+  }) {
+    final position = super.adjustPositionForNewDimensions(
+      oldPosition: oldPosition,
+      newPosition: newPosition,
+      isScrolling: isScrolling,
+      velocity: velocity,
+    );
+
+    final diff = newPosition.maxScrollExtent - oldPosition.maxScrollExtent;
+
+    if (oldPosition.pixels >= oldPosition.minScrollExtent && diff > 0) {
+      return position + diff;
+    } else {
+      return position;
+    }
+  }
+}