From e44924fb89c7d6fdad23c8bf0acc13dba23c45ec Mon Sep 17 00:00:00 2001
From: "Jay Freeman (saurik)" <saurik@saurik.com>
Date: Fri, 5 Nov 2010 09:32:48 -0700
Subject: [PATCH 1/1] Downgrade support for -[UIScrollView
 setDecelerationRate].

---
 UICaboodle/BrowserView.mm | 12 ++++++++++--
 iPhonePrivate.h           |  6 ++++++
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/UICaboodle/BrowserView.mm b/UICaboodle/BrowserView.mm
index 8b361f5e..90a584f3 100644
--- a/UICaboodle/BrowserView.mm
+++ b/UICaboodle/BrowserView.mm
@@ -36,6 +36,8 @@ static inline void CYRelease(Type_ &value) {
     }
 }
 
+float CYScrollViewDecelerationRateNormal;
+
 @interface WebView (Apple)
 - (void) _setLayoutInterval:(float)interval;
 @end
@@ -315,6 +317,11 @@ enum CYWebPolicyDecision {
 
 + (void) _initialize {
     [WebPreferences _setInitialDefaultTextEncodingToSystemEncoding];
+
+    if (float *_UIScrollViewDecelerationRateNormal = reinterpret_cast<float *>(dlsym(RTLD_DEFAULT, "UIScrollViewDecelerationRateNormal")))
+        CYScrollViewDecelerationRateNormal = *_UIScrollViewDecelerationRateNormal;
+    else // XXX: this actually might be fast on some older systems: we should look into this
+        CYScrollViewDecelerationRateNormal = 0.998;
 }
 
 - (void) dealloc {
@@ -807,7 +814,7 @@ enum CYWebPolicyDecision {
             scroller_ = [webview_ _scrollView];
 
             [scroller_ setDirectionalLockEnabled:YES];
-            [scroller_ setDecelerationRate:UIScrollViewDecelerationRateNormal];
+            [scroller_ setDecelerationRate:CYScrollViewDecelerationRateNormal];
             [scroller_ setDelaysContentTouches:NO];
 
             [scroller_ setCanCancelContentTouches:YES];
@@ -816,7 +823,8 @@ enum CYWebPolicyDecision {
             scroller_ = (UIScrollView *) scroller;
 
             [scroller setDirectionalScrolling:YES];
-            [scroller setScrollDecelerationFactor:UIScrollViewDecelerationRateNormal]; /* 0.989324 */
+            // XXX: we might be better off /not/ setting this on older systems
+            [scroller setScrollDecelerationFactor:CYScrollViewDecelerationRateNormal]; /* 0.989324 */
             [scroller setScrollHysteresis:0]; /* 8 */
 
             [scroller setThumbDetectionEnabled:NO];
diff --git a/iPhonePrivate.h b/iPhonePrivate.h
index 6dc893b7..1c198581 100644
--- a/iPhonePrivate.h
+++ b/iPhonePrivate.h
@@ -318,6 +318,12 @@ typedef enum {
 - (void) setModalPresentationStyle:(UIModalPresentationStyle)style;
 @end
 
+@interface UIScrollView (iOS_3_0)
+@property(assign, nonatomic) float decelerationRate;
+@end
+
+extern float const UIScrollViewDecelerationRateNormal;
+
 #endif//AVAILABLE_MAC_OS_X_VERSION_10_6_AND_LATER
 // }}}
 
-- 
2.45.2