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node_modules/react-native-screens/ios/helpers/scroll-view/RNSContentScrollViewProviding.h

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+#pragma once
+
+@protocol RNSContentScrollViewProviding
+
+/**
+ * Finds content ScrollView within provider's hierarchy. The content ScrollView serves as a main interaction on the
+ * given screen. Implementations may use `RNSScrollViewFinder` to continue the search however they see fit.
+ */
+- (nullable UIScrollView *)findContentScrollView;
+
+@end

node_modules/react-native-screens/ios/helpers/scroll-view/RNSScrollEdgeEffectApplicator.h

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+#pragma once
+
+#import "RNSEnums.h"
+
+@protocol RNSScrollEdgeEffectProviding
+- (RNSScrollEdgeEffect)bottomScrollEdgeEffect;
+- (RNSScrollEdgeEffect)leftScrollEdgeEffect;
+- (RNSScrollEdgeEffect)rightScrollEdgeEffect;
+- (RNSScrollEdgeEffect)topScrollEdgeEffect;
+@end
+
+@interface RNSScrollEdgeEffectApplicator : NSObject
++ (void)applyToScrollView:(UIScrollView *)scrollView withProvider:(id<RNSScrollEdgeEffectProviding>)provider;
+@end

node_modules/react-native-screens/ios/helpers/scroll-view/RNSScrollEdgeEffectApplicator.mm

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+#import "RNSScrollEdgeEffectApplicator.h"
+#import <React/RCTLog.h>
+#import "RNSDefines.h"
+#import "RNSEnums.h"
+
+@implementation RNSScrollEdgeEffectApplicator
+
++ (void)applyToScrollView:(UIScrollView *)scrollView withProvider:(id<RNSScrollEdgeEffectProviding>)provider
+{
+#if RNS_IPHONE_OS_VERSION_AVAILABLE(26_0)
+  if (@available(iOS 26, *)) {
+    [RNSScrollEdgeEffectApplicator configureEffect:scrollView.bottomEdgeEffect
+                                          withEnum:[provider bottomScrollEdgeEffect]];
+    [RNSScrollEdgeEffectApplicator configureEffect:scrollView.leftEdgeEffect withEnum:[provider leftScrollEdgeEffect]];
+    [RNSScrollEdgeEffectApplicator configureEffect:scrollView.rightEdgeEffect
+                                          withEnum:[provider rightScrollEdgeEffect]];
+    [RNSScrollEdgeEffectApplicator configureEffect:scrollView.topEdgeEffect withEnum:[provider topScrollEdgeEffect]];
+  }
+#endif
+}
+
+#if RNS_IPHONE_OS_VERSION_AVAILABLE(26_0)
++ (void)configureEffect:(UIScrollEdgeEffect *)edgeEffect
+               withEnum:(RNSScrollEdgeEffect)effectEnum API_AVAILABLE(ios(26.0))
+{
+  if (@available(iOS 26, *)) {
+    switch (effectEnum) {
+      case RNSScrollEdgeEffectAutomatic:
+        edgeEffect.hidden = false;
+        edgeEffect.style = UIScrollEdgeEffectStyle.automaticStyle;
+        break;
+      case RNSScrollEdgeEffectHard:
+        edgeEffect.hidden = false;
+        edgeEffect.style = UIScrollEdgeEffectStyle.hardStyle;
+        break;
+      case RNSScrollEdgeEffectSoft:
+        edgeEffect.hidden = false;
+        edgeEffect.style = UIScrollEdgeEffectStyle.softStyle;
+        break;
+      case RNSScrollEdgeEffectHidden:
+        edgeEffect.hidden = true;
+        edgeEffect.style = UIScrollEdgeEffectStyle.automaticStyle;
+        break;
+      default:
+        RCTLogError(@"[RNScreens] unsupported edge effect");
+        break;
+    }
+  }
+}
+#endif
+
+@end

node_modules/react-native-screens/ios/helpers/scroll-view/RNSScrollViewFinder.h

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+#pragma once
+
+#import <UIKit/UIKit.h>
+#import "RNSContentScrollViewProviding.h"
+
+@interface RNSScrollViewFinder : NSObject
+
+/**
+ * Searches for content ScrollView by traversing down the hierarchy using first subview, similar to UIKit behavior.
+ * It will fail if:
+ * - UIScrollView is not a first subview of view or one of its descendants in the hierarchy,
+ * - if UIScrollView's parent is not yet attached.
+ *
+ * When `view == nil`, it should also return `nil`.
+ */
++ (nullable UIScrollView *)findScrollViewInFirstDescendantChainFrom:(nullable UIView *)view;
+
+/**
+ * Looks for UIScrollView in a similar way to `findScrollViewInFirstDescendantChainFrom`, until it finds
+ * `RNSContentScrollViewProviding`. Then, it delegates the task to the provider, and returns the results. This can
+ * overcome the problems of subviews' children not being mounted yet, or ScrollView being mounted at index different
+ * than 0.
+ *
+ * When `view == nil`, it should also return `nil`.
+ */
++ (nullable UIScrollView *)findContentScrollViewWithDelegatingToProvider:(nullable UIView *)view;
+
+@end

node_modules/react-native-screens/ios/helpers/scroll-view/RNSScrollViewFinder.mm

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+#import "RNSScrollViewFinder.h"
+
+@implementation RNSScrollViewFinder
+
++ (UIScrollView *)findScrollViewInFirstDescendantChainFrom:(UIView *)view
+{
+  UIView *currentView = view;
+
+  while (currentView != nil) {
+    if ([currentView isKindOfClass:UIScrollView.class]) {
+      return static_cast<UIScrollView *>(currentView);
+    } else if ([currentView.subviews count] > 0) {
+      currentView = currentView.subviews[0];
+    } else {
+      break;
+    }
+  }
+
+  return nil;
+}
+
++ (nullable UIScrollView *)findContentScrollViewWithDelegatingToProvider:(nullable UIView *)view
+{
+  UIView *currentView = view;
+
+  while (currentView != nil) {
+    if ([currentView isKindOfClass:UIScrollView.class]) {
+      return static_cast<UIScrollView *>(currentView);
+    } else if ([currentView respondsToSelector:@selector(findContentScrollView)]) {
+      // When traversing the hierarchy, we don't check for conformance to protocol,
+      // but whether the view responds to `RNSContentScrollViewProviding.findContentScrollView`.
+      // This doesn't place locks and is faster.
+      return [static_cast<id<RNSContentScrollViewProviding>>(currentView) findContentScrollView];
+    } else if ([currentView.subviews count] > 0) {
+      currentView = currentView.subviews[0];
+    } else {
+      break;
+    }
+  }
+
+  return nil;
+}
+
+@end

node_modules/react-native-screens/ios/helpers/scroll-view/RNSScrollViewHelper.h

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+#pragma once
+
+#import <UIKit/UIKit.h>
+
+@interface RNSScrollViewHelper : NSObject
+
+/**
+ * Finds and overrides contentInsetAdjustmentBehavior for first ScrollView in first descendant chain from view.
+ */
++ (void)overrideScrollViewBehaviorInFirstDescendantChainFrom:(nullable UIView *)view;
+
+@end

node_modules/react-native-screens/ios/helpers/scroll-view/RNSScrollViewHelper.mm

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+#import "RNSScrollViewHelper.h"
+#import "RNSScrollViewFinder.h"
+
+@implementation RNSScrollViewHelper
+
++ (void)overrideScrollViewBehaviorInFirstDescendantChainFrom:(nullable UIView *)view
+{
+  UIScrollView *scrollView = [RNSScrollViewFinder findScrollViewInFirstDescendantChainFrom:view];
+
+  if ([scrollView contentInsetAdjustmentBehavior] == UIScrollViewContentInsetAdjustmentNever) {
+    [scrollView setContentInsetAdjustmentBehavior:UIScrollViewContentInsetAdjustmentAutomatic];
+  }
+}
+
+@end