First cut at working tabView controller

Headers/AppKit/NSTabViewController.h

@@ -50,7 +50,6 @@ typedef NSUInteger NSTabViewControllerTabStyle;
   NSTabViewControllerTabStyle _tabStyle;
   NSViewControllerTransitionOptions _transitionOptions;
   BOOL _canPropagateSelectedChildViewControllerTitle;
-  NSMutableArray *_tabViewItems;
 }
   
 - (NSTabViewControllerTabStyle) tabStyle;

Headers/AppKit/NSTabViewItem.h

@@ -41,6 +41,7 @@ typedef enum {
 @class NSColor;
 @class NSTabView;
 @class NSView;
+@class NSViewController;
 
 @interface NSTabViewItem : NSObject <NSCoding>
 {
@@ -53,7 +54,9 @@ typedef enum {
   NSTabView *_tabview;
   NSRect _rect; // cached
   NSString *_toolTip;
+  NSViewController *_viewController;
 }
+
 - (id) initWithIdentifier:(id)identifier;
 
 - (void)setIdentifier:(id)identifier;
@@ -78,6 +81,13 @@ typedef enum {
 - (void)drawLabel:(BOOL)shouldTruncateLabel
            inRect:(NSRect)tabRect;
 
+#if OS_API_VERSION(MAC_OS_X_VERSION_10_10, GS_API_LATEST)
+- (NSViewController *) viewController;
+- (void) setViewController: (NSViewController *)vc;
+
++ (instancetype) tabViewItemWithViewController: (NSViewController *)vc;
+#endif
+
 #if OS_API_VERSION(MAC_OS_X_VERSION_10_6, GS_API_LATEST)
 - (NSString *)toolTip;
 - (void)setToolTip:(NSString *)newToolTip;

Source/NSSplitViewController.m

@@ -68,6 +68,7 @@
 - (void) setSplitView: (NSSplitView *)splitView
 {
   [self setView: splitView];
+  [splitView setDelegate: self];
 }
 
 - (NSSplitViewItem *) splitViewItemForViewController: (NSViewController *)vc

Source/NSStoryboardSegue.m

@@ -31,6 +31,9 @@
 #import "AppKit/NSSplitViewController.h"
 #import "AppKit/NSSplitViewItem.h"
 #import "AppKit/NSSplitView.h"
+#import "AppKit/NSTabViewController.h"
+#import "AppKit/NSTabViewItem.h"
+#import "AppKit/NSTabView.h"
 #import "AppKit/NSWindow.h"
 #import "AppKit/NSApplication.h"
 #import "AppKit/NSView.h"
@@ -130,6 +133,12 @@
           NSSplitViewItem *item = [[svc splitViewItems] objectAtIndex: idx];
           [item setViewController: _destinationController];
         }
+      else if ([_relationship isEqualToString: @"tabItems"])
+        {
+          NSTabViewController *tvc = (NSTabViewController *)_sourceController;
+          NSTabViewItem *item = [NSTabViewItem tabViewItemWithViewController: _destinationController];
+          [tvc addTabViewItem: item]; 
+        }
     }
   else if ([_kind isEqualToString: @"modal"])
     {

Source/NSTabViewController.m

@@ -22,9 +22,166 @@
    Boston, MA 02110 USA.
 */
 
+#import <Foundation/NSArray.h>
+
 #import "AppKit/NSTabViewController.h"
+#import "AppKit/NSTabViewItem.h"
+#import "AppKit/NSTabView.h"
+
+#import "GSFastEnumeration.h"
 
 @implementation NSTabViewController
+- (NSTabViewControllerTabStyle) tabStyle
+{
+  return _tabStyle;
+}
 
+- (void) setTabStyle: (NSTabViewControllerTabStyle)ts
+{
+  _tabStyle = ts;
+}
+
+- (NSTabView *) tabView
+{
+  return (NSTabView *)[self view];
+}
+
+- (void) setTabView: (NSTabView *)tv
+{
+  [self setView: tv];
+  [tv setDelegate: self];
+}
+
+- (NSViewControllerTransitionOptions) transitionOptions
+{
+  return _transitionOptions;
+}
+
+- (void) setTransitionOptions: (NSViewControllerTransitionOptions)options
+{
+  _transitionOptions = options;
+}
+
+- (BOOL) canPropagateSelectedChildViewControllerTitle
+{
+  return _canPropagateSelectedChildViewControllerTitle;
+}
+
+- (void) setCanPropagateSelectedChildViewControllerTitle: (BOOL)flag
+{
+  _canPropagateSelectedChildViewControllerTitle = flag;
+}
+
+// Managing tabViewItems...
+- (NSArray *) tabViewItems
+{
+  return [[self tabView] tabViewItems];
+}
+
+- (void) setTabViewItems: (NSArray *)items
+{
+  FOR_IN(NSTabViewItem*, item, items)
+    [[self tabView] addTabViewItem: item];
+  END_FOR_IN(items);
+}
+
+- (NSTabViewItem *) tabViewItemForViewController: (NSViewController *)controller
+{
+  NSArray *tabViewItems = [[self tabView] tabViewItems];
+  FOR_IN(NSTabViewItem*, tvi, tabViewItems)
+    if ([tvi viewController] == controller)
+      {
+        return tvi;
+      }
+  END_FOR_IN(tabViewItems);
+  return nil;
+}
+
+- (void) addTabViewItem: (NSTabViewItem *)item
+{
+  [[self tabView] addTabViewItem: item];
+}
+
+- (void) insertTabViewItem: (NSTabViewItem *)item 
+                   atIndex: (NSInteger)index
+{
+  [[self tabView] insertTabViewItem: item atIndex: index];
+}
+
+- (void) removeTabViewItem: (NSTabViewItem *)item
+{
+  [[self tabView] removeTabViewItem: item];
+}
+
+- (NSInteger) selectedTabViewItemIndex
+{
+  return [[self tabView] indexOfTabViewItem: [[self tabView] selectedTabViewItem]];
+}
+
+- (void) setSelectedTabViewItemIndex: (NSInteger)idx
+{
+  [[self tabView] selectTabViewItemAtIndex: idx];
+}
+
+// Responding to tabview actions...
+- (BOOL)tabView:(NSTabView *)tabView 
+  shouldSelectTabViewItem:(NSTabViewItem *)tabViewItem
+{
+  return YES;
+}
+
+- (void)tabView:(NSTabView *)tabView
+  willSelectTabViewItem:(NSTabViewItem *)tabViewItem
+{
+  // not implemented
+}
+
+- (void)tabView:(NSTabView *)tabView 
+  didSelectTabViewItem:(NSTabViewItem *)tabViewItem
+{
+  // not implemented
+}
+
+// Responding to toolbar actions...
+- (NSToolbarItem *)toolbar:(NSToolbar *)toolbar 
+     itemForItemIdentifier:(NSToolbarItemIdentifier)itemIdentifier
+     willBeInsertedIntoToolbar:(BOOL)flag
+{
+  return nil; 
+}
+
+- (NSArray *)toolbarAllowedItemIdentifiers:(NSToolbar *)toolbar
+{
+  return [NSArray array];
+}
+
+- (NSArray *)toolbarSelectableItemIdentifiers:(NSToolbar *)toolbar
+{
+  return [NSArray array];
+}
+
+// NSCoding
+- (instancetype) initWithCoder: (NSCoder *)coder
+{
+  self = [super initWithCoder: coder];
+  if ([coder allowsKeyedCoding])
+    {
+      if ([coder containsValueForKey: @"NSTabView"])
+        {
+          NSTabView *tv = [coder decodeObjectForKey: @"NSTabView"];
+          [self setTabView: tv];
+        }
+      if ([coder containsValueForKey: @"NSTabViewItems"])
+        {
+          NSArray *items = [coder decodeObjectForKey: @"NSTabViewItems"];
+          [self setTabViewItems: items];
+        }
+    }
+  return self;
+}
+
+- (void) encodeWithCoder: (NSCoder *)coder
+{
+}
 @end
 

Source/NSTabViewItem.m

@@ -33,6 +33,7 @@
 #import "AppKit/NSTabView.h"
 #import "AppKit/NSTabViewItem.h"
 #import "AppKit/PSOperators.h"
+#import "AppKit/NSViewController.h"
 
 @implementation NSTabViewItem
 
@@ -72,6 +73,24 @@
 		   NSStringFromClass([self class]), _label, _ident];
 }
 
+- (NSViewController *) viewController
+{
+  return _viewController;
+}
+
+- (void) setViewController: (NSViewController *)vc
+{
+  _viewController = vc; // weak
+  [self setView: [vc view]];
+}
+
++ (instancetype) tabViewItemWithViewController: (NSViewController *)vc
+{
+  NSTabViewItem *item = [[NSTabViewItem alloc] init];
+  [item setViewController: vc];
+  return item;
+}
+
 // Set identifier.
 
 - (void) setIdentifier: (id)identifier