From df38eb2ead833bec3335baeb7dad7761186ef40f Mon Sep 17 00:00:00 2001
From: Justin Spahr-Summers <Justin.SpahrSummers@gmail.com>
Date: Tue, 17 Jul 2012 16:42:50 -0700
Subject: [PATCH] Added -[TUIView ancestorSharedWithView:]

---
 lib/UIKit/TUIView.h |  6 ++++++
 lib/UIKit/TUIView.m | 16 +++++++++++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/lib/UIKit/TUIView.h b/lib/UIKit/TUIView.h
index 20a0635..9c05479 100644
--- a/lib/UIKit/TUIView.h
+++ b/lib/UIKit/TUIView.h
@@ -304,6 +304,12 @@ extern CGRect(^TUIViewCenteredLayout)(TUIView*);
 - (void)willMoveToWindow:(TUINSWindow *)newWindow;
 - (void)didMoveToWindow;
 
+/**
+ * Returns the closest ancestor that is shared by the receiver and another view,
+ * or nil if there is no such view.
+ */
+- (TUIView *)ancestorSharedWithView:(TUIView *)view;
+
 /**
  Note: returns YES ff view == reciever
  */
diff --git a/lib/UIKit/TUIView.m b/lib/UIKit/TUIView.m
index d4e2697..881fa0e 100644
--- a/lib/UIKit/TUIView.m
+++ b/lib/UIKit/TUIView.m
@@ -723,7 +723,7 @@ else CGContextSetRGBFillColor(context, 1, 0, 0, 0.3); CGContextFillRect(context,
 	} else {\
 		[self.subviews insertObject:view atIndex:index];\
 	}\
- 	[view removeFromSuperview]; /* will call willAdd:nil and didAdd (nil) */ \
+	[view removeFromSuperview]; /* will call willAdd:nil and didAdd (nil) */ \
 	[view willMoveToSuperview:self]; \
 	view.nsView = _nsView;
 
@@ -835,6 +835,20 @@ else CGContextSetRGBFillColor(context, 1, 0, 0, 0.3); CGContextFillRect(context,
 
 #define END_EACH_SUBVIEW }
 
+- (TUIView *)ancestorSharedWithView:(TUIView *)view
+{
+	TUIView *parentView = self;
+
+	do {
+		if ([view isDescendantOfView:parentView])
+			return parentView;
+
+		parentView = parentView.superview;
+	} while (parentView);
+
+	return nil;
+}
+
 - (BOOL)isDescendantOfView:(TUIView *)view
 {
 	TUIView *v = self;