Add method to decode transitionStyle

Source/GSXib5KeyedUnarchiver.m

@@ -60,6 +60,7 @@
 #import "AppKit/NSTabView.h"
 #import "AppKit/NSToolbarItem.h"
 #import "AppKit/NSView.h"
+#import "AppKit/NSPageController.h"
 #import "GSCodingFlags.h"
 
 #define DEBUG_XIB5 0
@@ -388,6 +389,7 @@ static NSArray      *XmlBoolDefaultYes  = nil;
                @"decodeToolbarImageForElement:", @"NSToolbarItemImage",
                @"decodeControlContentsForElement:", @"NSControlContents",
                @"decodePathStyle:", @"NSPathStyle",
+               @"decodeTransitionStyle:", @"NSTransitionStyle",
                  nil];
           RETAIN(XmlKeyToDecoderSelectorMap);
 
@@ -2779,6 +2781,31 @@ didStartElement: (NSString*)elementName
   return num;  
 }
 
+- (id) decodeTransitionStyle: (GSXibElement *)element
+{
+  NSNumber *num = [NSNumber numberWithInteger: 0];
+  id obj = [element attributeForKey: @"transitionStyle"];
+
+  if ([obj isEqualToString: @"stackHistory"])
+    {
+      num = [NSNumber numberWithInteger: NSPageControllerTransitionStyleStackHistory];
+    }
+  else if ([obj isEqualToString: @"stackBook"])
+    {
+      num = [NSNumber numberWithInteger: NSPageControllerTransitionStyleStackBook];
+    }
+  else if ([obj isEqualToString: @"horizontalStrip"])
+    {
+      num = [NSNumber numberWithInteger: NSPageControllerTransitionStyleHorizontalStrip];
+    }
+  else // if not specified then assume standard...
+    {
+      num = [NSNumber numberWithInteger: NSPageControllerTransitionStyleStackHistory];
+    }
+
+  return num;  
+}
+
 - (id) objectForXib: (GSXibElement*)element
 {
   id object = [super objectForXib: element];