Skeleton out scrubber layout

Headers/AppKit/NSScrubberLayout.h

@@ -25,7 +25,9 @@
 #ifndef _NSScrubberLayout_h_GNUSTEP_GUI_INCLUDE
 #define _NSScrubberLayout_h_GNUSTEP_GUI_INCLUDE
 
-#import "Foundation/NSObject.h"
+#import <Foundation/NSObject.h>
+#import <Foundation/NSCoder.h>
+#import <Foundation/NSGeometry.h>
 
 #if OS_API_VERSION(MAC_OS_X_VERSION_10_12, GS_API_LATEST)
 
@@ -33,10 +35,54 @@
 extern "C" {
 #endif
 
-@interface NSScrubberLayout : NSObject
+@class NSScrubber; 
+  
+@interface NSScrubberLayoutAttributes : NSObject <NSCopying>
+
++ (NSScrubberLayoutAttributes *) layoutAttributesForItemAtIndex: (NSInteger)index;
+
+- (CGFloat) alpha;
+
+- (NSRect) frame;
+
+- (NSInteger) itemIndex;
 
 @end
+  
+@interface NSScrubberLayout : NSObject <NSCoding>
 
+// Configuring
+- (Class) layoutAttributesClass;
+
+- (NSScrubber *) scrubber;
+
+- (NSRect) visibleRect;
+
+- (void) invalidateLayout;
+
+// Subclassing layout
+- (void) prepareLayout;
+
+- (NSSize) scrubberContentSize;
+
+- (NSScrubberLayoutAttributes *) layoutAttributesForItemAtIndex: (NSInteger)index;
+
+- (NSScrubberLayoutAttributes *) layoutAttributesForItemsInRect: (NSRect)rect;
+
+- (BOOL) shouldInvalidateLayoutForHighlightChange;
+
+- (BOOL) shouldInvalidateLayoutForSelectionChange;
+
+- (BOOL) shouldInvalidateLayoutForChangeFromVisibleRect: (NSRect)fromRect
+                                          toVisibleRect: (NSRect)toRect;
+
+- (BOOL) automaticallyMirrorsInRightToLeftLayout;
+  
+@end
+
+
+
+  
 #if	defined(__cplusplus)
 }
 #endif

Source/NSScrubberLayout.m

@@ -24,7 +24,112 @@
 
 #import "AppKit/NSScrubberLayout.h"
 
-@implementation NSScrubberLayout
+@implementation NSScrubberLayoutAttributes 
+
++ (NSScrubberLayoutAttributes *) layoutAttributesForItemAtIndex: (NSInteger)index
+{
+  return nil;
+}
+
+- (CGFloat) alpha
+{
+  return 0.0;
+}
+
+- (NSRect) frame
+{
+  return NSZeroRect;
+}
+
+- (NSInteger) itemIndex
+{
+  return 0;
+}
+
+- (instancetype) copyWithZone: (NSZone *)z
+{
+  return nil;
+}
+
+@end
+
+@implementation NSScrubberLayout
+// Configuring
+- (Class) layoutAttributesClass
+{
+  return nil;
+}
+
+- (NSScrubber *) scrubber
+{
+  return nil;
+}
+
+- (NSRect) visibleRect
+{
+  return NSZeroRect;
+}
+
+- (void) invalidateLayout
+{
+}
+
+// Subclassing layout
+- (void) prepareLayout
+{
+}
+
+- (NSSize) scrubberContentSize
+{
+  return NSZeroSize;
+}
+
+- (NSScrubberLayoutAttributes *) layoutAttributesForItemAtIndex: (NSInteger)index
+{
+  return nil;
+}
+
+- (NSScrubberLayoutAttributes *) layoutAttributesForItemsInRect: (NSRect)rect
+{
+  return nil;
+}
+
+- (BOOL) shouldInvalidateLayoutForHighlightChange
+{
+  return NO;
+}
+
+- (BOOL) shouldInvalidateLayoutForSelectionChange
+{
+  return NO;
+}
+
+- (BOOL) shouldInvalidateLayoutForChangeFromVisibleRect: (NSRect)fromRect
+                                          toVisibleRect: (NSRect)toRect
+{
+  return NO;
+}
+
+- (BOOL) automaticallyMirrorsInRightToLeftLayout
+{
+  return NO;
+}
+
+- (instancetype) init
+{
+  self = [super init];
+  return self;
+}
+
+- (instancetype) initWithCoder: (NSCoder *)coder
+{
+  self = [super init];
+  return self;
+}
+
+- (void) encodeWithCoder: (NSCoder *)coder
+{
+}
 
 @end