improve horizontal touch slop

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

lib/common/widgets/gesture/horizontal_drag_gesture_recognizer.dart

@@ -1,4 +1,5 @@
 import 'package:PiliPlus/utils/storage_pref.dart';
+import 'package:flutter/foundation.dart' show PlatformDispatcher;
 import 'package:flutter/gestures.dart';
 
 mixin InitialPositionMixin on GestureRecognizer {
@@ -50,20 +51,30 @@ bool _computeHitSlop(
   Offset lastPosition,
 ) {
   switch (kind) {
-    case PointerDeviceKind.mouse:
+    case .mouse:
       return globalDistanceMoved > kPrecisePointerHitSlop;
-    case PointerDeviceKind.stylus:
-    case PointerDeviceKind.invertedStylus:
-    case PointerDeviceKind.unknown:
-    case PointerDeviceKind.touch:
+    case .stylus:
+    case .invertedStylus:
+    case .unknown:
+    case .touch:
       return globalDistanceMoved > settings.touchSlop! &&
-          _calc(initialPosition!, lastPosition);
-    case PointerDeviceKind.trackpad:
+          _calcAngle(initialPosition!, lastPosition);
+    case .trackpad:
       return globalDistanceMoved > settings.touchSlop!;
   }
 }
 
-bool _calc(Offset initialPosition, Offset lastPosition) {
+bool _calcAngle(Offset initialPosition, Offset lastPosition) {
   final offset = lastPosition - initialPosition;
   return offset.dx.abs() > offset.dy.abs() * 3;
 }
+
+final deviceTouchSlop = _calcDeviceTouchSlop();
+
+double _calcDeviceTouchSlop() {
+  final view = PlatformDispatcher.instance.views.first;
+  final physicalTouchSlop = view.gestureSettings.physicalTouchSlop;
+  return physicalTouchSlop == null
+      ? kTouchSlop
+      : physicalTouchSlop / view.devicePixelRatio;
+}

lib/pages/setting/models/extra_settings.dart

@@ -3,7 +3,7 @@ import 'dart:io';
 import 'package:PiliPlus/common/widgets/custom_icon.dart';
 import 'package:PiliPlus/common/widgets/flutter/refresh_indicator.dart';
 import 'package:PiliPlus/common/widgets/gesture/horizontal_drag_gesture_recognizer.dart'
-    show touchSlopH;
+    show deviceTouchSlop, touchSlopH;
 import 'package:PiliPlus/common/widgets/image_grid/image_grid_view.dart'
     show ImageGridView;
 import 'package:PiliPlus/http/fav.dart';
@@ -94,7 +94,7 @@ List<SettingsModel> get extraSettings => [
   ),
   NormalModel(
     title: '横向滑动阈值',
-    getSubtitle: () => '当前:「${Pref.touchSlopH}」',
+    getSubtitle: () => '当前:「${Pref.touchSlopH}」，系统默认值: $deviceTouchSlop',
     onTap: _showTouchSlopDialog,
     leading: const Icon(Icons.pan_tool_alt_outlined),
   ),

lib/utils/storage_pref.dart

@@ -1,6 +1,8 @@
 import 'dart:io';
 import 'dart:math' show pow, sqrt;
 
+import 'package:PiliPlus/common/widgets/gesture/horizontal_drag_gesture_recognizer.dart'
+    show deviceTouchSlop;
 import 'package:PiliPlus/common/widgets/pair.dart';
 import 'package:PiliPlus/http/constants.dart';
 import 'package:PiliPlus/models/common/dynamic/dynamic_badge_mode.dart';
@@ -509,8 +511,10 @@ abstract final class Pref {
   static bool get enableImgMenu =>
       _setting.get(SettingBoxKey.enableImgMenu, defaultValue: false);
 
-  static double get touchSlopH =>
-      _setting.get(SettingBoxKey.touchSlopH, defaultValue: 24.0);
+  static double get touchSlopH => _setting.get(
+    SettingBoxKey.touchSlopH,
+    defaultValue: deviceTouchSlop + 6.0,
+  );
 
   static bool get floatingNavBar =>
       _setting.get(SettingBoxKey.floatingNavBar, defaultValue: false);