Implement splitview management methods

Source/NSSplitViewController.m

@@ -22,9 +22,103 @@
    Boston, MA 02110 USA.
 */
 
+#import <Foundation/NSArray.h>
+
+#import "AppKit/NSSplitView.h"
 #import "AppKit/NSSplitViewController.h"
+#import "AppKit/NSSplitViewItem.h"
+#import "GSFastEnumeration.h"
 
 @implementation NSSplitViewController
+// return splitview...
+- (NSSplitView *) splitView
+{
+  return _splitView;
+}
 
+- (NSSplitViewItem *) splitViewItemForViewController: (NSViewController *)vc
+{
+  FOR_IN(NSSplitViewItem*, svi, _splitViewItems)
+    if ([svi viewController] == vc)
+      {
+        return svi;
+      }
+  END_FOR_IN(_splitViewItems);
+  return nil;
+}
+
+- (CGFloat) minimumThicknessForInlineSidebars
+{
+  return _minimumThicknessForInlineSidebars;
+}
+  
+// manage splitview items...
+- (NSArray *) splitViewItems
+{
+  return _splitViewItems;
+}
+
+- (void) addSplitViewItem: (NSSplitViewItem *)item
+{
+  [_splitViewItems addObject: item];
+}
+
+- (void) insertSplitViewItem: (NSSplitViewItem *)item atIndex: (NSInteger)index
+{
+  [_splitViewItems insertObject: item atIndex: index];
+}
+
+- (void) removeSplitViewItem: (NSSplitViewItem *)item
+{
+  [_splitViewItems removeObject: item];
+}
+
+// instance methods...
+- (NSRect)splitView:(NSSplitView *)splitView additionalEffectiveRectOfDividerAtIndex:(NSInteger)dividerIndex
+{
+  
+}
+
+- (BOOL)splitView:(NSSplitView *)splitView canCollapseSubview:(NSView *)subview
+{
+}
+
+- (NSRect)splitView:(NSSplitView *)splitView effectiveRect:(NSRect)proposedEffectiveRect forDrawnRect:(NSRect)drawnRect ofDividerAtIndex:(NSInteger)dividerIndex
+{
+}
+
+- (BOOL)splitView:(NSSplitView *)splitView shouldCollapseSubview:(NSView *)subview forDoubleClickOnDividerAtIndex:(NSInteger)dividerIndex
+{
+}
+
+- (BOOL)splitView:(NSSplitView *)splitView shouldHideDividerAtIndex:(NSInteger)dividerIndex
+{
+}
+
+- (IBAction)toggleSidebar:(id)sender
+{
+}
+
+- (BOOL)validateUserInterfaceItem:(id<NSValidatedUserInterfaceItem>)item
+{
+}
+
+- (void)viewDidLoad
+{
+}
+
+// NSCoding
+- (instancetype) initWithCoder: (NSCoder *)coder
+{
+}
+
+- (void) encodeWithCoder: (NSCoder *)coder
+{
+}
+
+// NSCopying
+- (id) copyWithZone: (NSZone *)z
+{
+}
 @end