added: user can define cupertino parallex effect

@@ -544,7 +544,7 @@ extension GetNavigation on GetInterface {
     Bindings? binding,
     bool preventDuplicates = true,
     bool? popGesture,
-    double gestureWidth = 20,
+    double Function(BuildContext context)? gestureWidth,
   }) {
     var routeName = "/${page.runtimeType.toString()}";
     if (preventDuplicates && routeName == currentRoute) {
@@ -914,7 +914,7 @@ you can only use widgets and widget functions here''';
     bool fullscreenDialog = false,
     bool preventDuplicates = true,
     Duration? duration,
-    double gestureWidth = 20,
+    double Function(BuildContext context)? gestureWidth,
   }) {
     var routeName = "/${page.runtimeType.toString()}";
     if (preventDuplicates && routeName == currentRoute) {
@@ -977,7 +977,7 @@ you can only use widgets and widget functions here''';
     Transition? transition,
     Curve? curve,
     Duration? duration,
-    double gestureWidth = 20,
+    double Function(BuildContext context)? gestureWidth,
   }) {
     var routeName = "/${page.runtimeType.toString()}";
 

@@ -16,7 +16,7 @@ class GetPageRoute<T> extends PageRoute<T> with GetPageRouteTransitionMixin<T> {
     this.transitionDuration = const Duration(milliseconds: 300),
     this.opaque = true,
     this.parameter,
-    this.gestureWidth = 20.0,
+    this.gestureWidth,
     this.curve,
     this.alignment,
     this.transition,
@@ -29,6 +29,7 @@ class GetPageRoute<T> extends PageRoute<T> with GetPageRouteTransitionMixin<T> {
     this.routeName,
     this.page,
     this.title,
+    this.showCupertinoParallax = true,
     this.barrierLabel,
     this.maintainState = true,
     bool fullscreenDialog = false,
@@ -47,6 +48,9 @@ class GetPageRoute<T> extends PageRoute<T> with GetPageRouteTransitionMixin<T> {
   final List<Bindings>? bindings;
 
   @override
+  final bool showCupertinoParallax;
+
+  @override
   final bool opaque;
   final bool? popGesture;
 
@@ -109,5 +113,5 @@ class GetPageRoute<T> extends PageRoute<T> with GetPageRouteTransitionMixin<T> {
   String get debugLabel => '${super.debugLabel}(${settings.name})';
 
   @override
-  final double gestureWidth;
+  final double Function(BuildContext context)? gestureWidth;
 }

@@ -38,7 +38,7 @@ class GetPage<T> extends Page<T> {
   final Alignment? alignment;
   final bool maintainState;
   final bool opaque;
-  final double gestureWidth;
+  final double Function(BuildContext context)? gestureWidth;
   final Bindings? binding;
   final List<Bindings> bindings;
   final CustomTransition? customTransition;
@@ -61,13 +61,14 @@ class GetPage<T> extends Page<T> {
   final List<GetMiddleware>? middlewares;
   final PathDecoded path;
   final GetPage? unknownRoute;
+  final bool showCupertinoParallax;
 
   GetPage({
     required this.name,
     required this.page,
     this.title,
     this.participatesInRootNavigator,
-    this.gestureWidth = 20,
+    this.gestureWidth,
     // RouteSettings settings,
     this.maintainState = true,
     this.curve = Curves.linear,
@@ -85,6 +86,7 @@ class GetPage<T> extends Page<T> {
     this.middlewares,
     this.unknownRoute,
     this.arguments,
+    this.showCupertinoParallax = true,
     this.preventDuplicates = true,
   })  : path = _nameToRegex(name),
         super(
@@ -136,9 +138,10 @@ class GetPage<T> extends Page<T> {
     GetPage? unknownRoute,
     List<GetMiddleware>? middlewares,
     bool? preventDuplicates,
-    double? gestureWidth,
+    final double Function(BuildContext context)? gestureWidth,
     bool? participatesInRootNavigator,
     Object? arguments,
+    bool? showCupertinoParallax,
   }) {
     return GetPage(
       participatesInRootNavigator:
@@ -164,6 +167,8 @@ class GetPage<T> extends Page<T> {
       middlewares: middlewares ?? this.middlewares,
       gestureWidth: gestureWidth ?? this.gestureWidth,
       arguments: arguments ?? this.arguments,
+      showCupertinoParallax:
+          showCupertinoParallax ?? this.showCupertinoParallax,
     );
   }
 

@@ -10,7 +10,7 @@ import '../../../get.dart';
 import 'default_transitions.dart';
 import 'transitions_type.dart';
 
-//const double _kBackGestureWidth = 20.0;
+const double _kBackGestureWidth = 20.0;
 const double _kMinFlingVelocity = 1.0; // Screen widths per second.
 
 // An eyeballed value for the maximum time it takes
@@ -36,7 +36,7 @@ mixin GetPageRouteTransitionMixin<T> on PageRoute<T> {
   /// {@endtemplate}
   String? get title;
 
-  double get gestureWidth;
+  double Function(BuildContext context)? get gestureWidth;
 
   ValueNotifier<String?>? _previousTitle;
 
@@ -86,12 +86,16 @@ Cannot read the previousTitle for a route that has not yet been installed''',
   @override
   String? get barrierLabel => null;
 
+  bool get showCupertinoParallax;
+
   @override
   bool canTransitionTo(TransitionRoute<dynamic> nextRoute) {
     // Don't perform outgoing animation if the next route is a
     // fullscreen dialog.
-    return nextRoute is CupertinoRouteTransitionMixin &&
-        !nextRoute.fullscreenDialog;
+
+    return nextRoute is GetPageRouteTransitionMixin &&
+        !nextRoute.fullscreenDialog &&
+        nextRoute.showCupertinoParallax;
   }
 
   /// True if an iOS-style back swipe pop gesture is currently
@@ -231,7 +235,8 @@ Cannot read the previousTitle for a route that has not yet been installed''',
           secondaryAnimation,
           route.popGesture ?? Get.defaultPopGesture
               ? CupertinoBackGestureDetector<T>(
-                  gestureWidth: route.gestureWidth,
+                  gestureWidth:
+                      route.gestureWidth?.call(context) ?? _kBackGestureWidth,
                   enabledCallback: () => _isPopGestureEnabled<T>(route),
                   onStartPopGesture: () => _startPopGesture<T>(route),
                   child: child)
@@ -253,7 +258,8 @@ Cannot read the previousTitle for a route that has not yet been installed''',
               secondaryAnimation,
               route.popGesture ?? Get.defaultPopGesture
                   ? CupertinoBackGestureDetector<T>(
-                      gestureWidth: route.gestureWidth,
+                      gestureWidth: route.gestureWidth?.call(context) ??
+                          _kBackGestureWidth,
                       enabledCallback: () => _isPopGestureEnabled<T>(route),
                       onStartPopGesture: () => _startPopGesture<T>(route),
                       child: child)
@@ -268,7 +274,8 @@ Cannot read the previousTitle for a route that has not yet been installed''',
               secondaryAnimation,
               route.popGesture ?? Get.defaultPopGesture
                   ? CupertinoBackGestureDetector<T>(
-                      gestureWidth: route.gestureWidth,
+                      gestureWidth: route.gestureWidth?.call(context) ??
+                          _kBackGestureWidth,
                       enabledCallback: () => _isPopGestureEnabled<T>(route),
                       onStartPopGesture: () => _startPopGesture<T>(route),
                       child: child)
@@ -283,7 +290,8 @@ Cannot read the previousTitle for a route that has not yet been installed''',
               secondaryAnimation,
               route.popGesture ?? Get.defaultPopGesture
                   ? CupertinoBackGestureDetector<T>(
-                      gestureWidth: route.gestureWidth,
+                      gestureWidth: route.gestureWidth?.call(context) ??
+                          _kBackGestureWidth,
                       enabledCallback: () => _isPopGestureEnabled<T>(route),
                       onStartPopGesture: () => _startPopGesture<T>(route),
                       child: child)
@@ -292,7 +300,8 @@ Cannot read the previousTitle for a route that has not yet been installed''',
         case Transition.noTransition:
           return route.popGesture ?? Get.defaultPopGesture
               ? CupertinoBackGestureDetector<T>(
-                  gestureWidth: route.gestureWidth,
+                  gestureWidth:
+                      route.gestureWidth?.call(context) ?? _kBackGestureWidth,
                   enabledCallback: () => _isPopGestureEnabled<T>(route),
                   onStartPopGesture: () => _startPopGesture<T>(route),
                   child: child)
@@ -307,7 +316,8 @@ Cannot read the previousTitle for a route that has not yet been installed''',
               secondaryAnimation,
               route.popGesture ?? Get.defaultPopGesture
                   ? CupertinoBackGestureDetector<T>(
-                      gestureWidth: route.gestureWidth,
+                      gestureWidth: route.gestureWidth?.call(context) ??
+                          _kBackGestureWidth,
                       enabledCallback: () => _isPopGestureEnabled<T>(route),
                       onStartPopGesture: () => _startPopGesture<T>(route),
                       child: child)
@@ -322,7 +332,8 @@ Cannot read the previousTitle for a route that has not yet been installed''',
               secondaryAnimation,
               route.popGesture ?? Get.defaultPopGesture
                   ? CupertinoBackGestureDetector<T>(
-                      gestureWidth: route.gestureWidth,
+                      gestureWidth: route.gestureWidth?.call(context) ??
+                          _kBackGestureWidth,
                       enabledCallback: () => _isPopGestureEnabled<T>(route),
                       onStartPopGesture: () => _startPopGesture<T>(route),
                       child: child)
@@ -337,7 +348,8 @@ Cannot read the previousTitle for a route that has not yet been installed''',
               secondaryAnimation,
               route.popGesture ?? Get.defaultPopGesture
                   ? CupertinoBackGestureDetector<T>(
-                      gestureWidth: route.gestureWidth,
+                      gestureWidth: route.gestureWidth?.call(context) ??
+                          _kBackGestureWidth,
                       enabledCallback: () => _isPopGestureEnabled<T>(route),
                       onStartPopGesture: () => _startPopGesture<T>(route),
                       child: child)
@@ -352,7 +364,8 @@ Cannot read the previousTitle for a route that has not yet been installed''',
               secondaryAnimation,
               route.popGesture ?? Get.defaultPopGesture
                   ? CupertinoBackGestureDetector<T>(
-                      gestureWidth: route.gestureWidth,
+                      gestureWidth: route.gestureWidth?.call(context) ??
+                          _kBackGestureWidth,
                       enabledCallback: () => _isPopGestureEnabled<T>(route),
                       onStartPopGesture: () => _startPopGesture<T>(route),
                       child: child)
@@ -367,7 +380,8 @@ Cannot read the previousTitle for a route that has not yet been installed''',
               secondaryAnimation,
               route.popGesture ?? Get.defaultPopGesture
                   ? CupertinoBackGestureDetector<T>(
-                      gestureWidth: route.gestureWidth,
+                      gestureWidth: route.gestureWidth?.call(context) ??
+                          _kBackGestureWidth,
                       enabledCallback: () => _isPopGestureEnabled<T>(route),
                       onStartPopGesture: () => _startPopGesture<T>(route),
                       child: child)
@@ -379,7 +393,8 @@ Cannot read the previousTitle for a route that has not yet been installed''',
             secondaryRouteAnimation: secondaryAnimation,
             linearTransition: linearTransition,
             child: CupertinoBackGestureDetector<T>(
-              gestureWidth: route.gestureWidth,
+              gestureWidth:
+                  route.gestureWidth?.call(context) ?? _kBackGestureWidth,
               enabledCallback: () => _isPopGestureEnabled<T>(route),
               onStartPopGesture: () => _startPopGesture<T>(route),
               child: child,
@@ -395,7 +410,8 @@ Cannot read the previousTitle for a route that has not yet been installed''',
               secondaryAnimation,
               route.popGesture ?? Get.defaultPopGesture
                   ? CupertinoBackGestureDetector<T>(
-                      gestureWidth: route.gestureWidth,
+                      gestureWidth: route.gestureWidth?.call(context) ??
+                          _kBackGestureWidth,
                       enabledCallback: () => _isPopGestureEnabled<T>(route),
                       onStartPopGesture: () => _startPopGesture<T>(route),
                       child: child)
@@ -409,7 +425,8 @@ Cannot read the previousTitle for a route that has not yet been installed''',
               secondaryAnimation,
               route.popGesture ?? Get.defaultPopGesture
                   ? CupertinoBackGestureDetector<T>(
-                      gestureWidth: route.gestureWidth,
+                      gestureWidth: route.gestureWidth?.call(context) ??
+                          _kBackGestureWidth,
                       enabledCallback: () => _isPopGestureEnabled<T>(route),
                       onStartPopGesture: () => _startPopGesture<T>(route),
                       child: child)
@@ -423,7 +440,8 @@ Cannot read the previousTitle for a route that has not yet been installed''',
               secondaryAnimation,
               route.popGesture ?? Get.defaultPopGesture
                   ? CupertinoBackGestureDetector<T>(
-                      gestureWidth: route.gestureWidth,
+                      gestureWidth: route.gestureWidth?.call(context) ??
+                          _kBackGestureWidth,
                       enabledCallback: () => _isPopGestureEnabled<T>(route),
                       onStartPopGesture: () => _startPopGesture<T>(route),
                       child: child)
@@ -437,7 +455,8 @@ Cannot read the previousTitle for a route that has not yet been installed''',
               secondaryAnimation,
               route.popGesture ?? Get.defaultPopGesture
                   ? CupertinoBackGestureDetector<T>(
-                      gestureWidth: route.gestureWidth,
+                      gestureWidth: route.gestureWidth?.call(context) ??
+                          _kBackGestureWidth,
                       enabledCallback: () => _isPopGestureEnabled<T>(route),
                       onStartPopGesture: () => _startPopGesture<T>(route),
                       child: child)
@@ -456,7 +475,8 @@ Cannot read the previousTitle for a route that has not yet been installed''',
               secondaryAnimation,
               route.popGesture ?? Get.defaultPopGesture
                   ? CupertinoBackGestureDetector<T>(
-                      gestureWidth: route.gestureWidth,
+                      gestureWidth: route.gestureWidth?.call(context) ??
+                          _kBackGestureWidth,
                       enabledCallback: () => _isPopGestureEnabled<T>(route),
                       onStartPopGesture: () => _startPopGesture<T>(route),
                       child: child)

@@ -207,6 +207,7 @@ class PageRedirect {
           : settings,
       curve: _r.curve,
       opaque: _r.opaque,
+      showCupertinoParallax: _r.showCupertinoParallax,
       gestureWidth: _r.gestureWidth,
       customTransition: _r.customTransition,
       binding: _r.binding,
@@ -234,6 +235,7 @@ class PageRedirect {
       routeName: _r.name,
       settings: _r,
       curve: _r.curve,
+      showCupertinoParallax: _r.showCupertinoParallax,
       gestureWidth: _r.gestureWidth,
       opaque: _r.opaque,
       customTransition: _r.customTransition,