Added NSTabView

src/cocoa/NSTabView.nim

@@ -0,0 +1,7 @@
+{.compile: "widgets/tabview.m".}
+
+import NSFunctions
+
+proc newTabBox*(parent: ID, label: cstring; left: cint; top: cint; width: cint; height: cint): ID  {.cdecl, importc: "createTabView".}
+
+proc addTab*(parent: ID, label: cstring) {.cdecl, importc: "addTab".}

src/cocoa/widgets/tabview.m

@@ -0,0 +1,32 @@
+#import <Cocoa/Cocoa.h>
+
+#import "col.h"
+
+
+id createTabView(id parent, const char *label, int x, int y, int width, int height) {
+    NSString *str = [NSString stringWithUTF8String:label];
+    NSArray *items = [str componentsSeparatedByString: @"|"];
+    
+	id *widget = [[[NSTabView alloc] initWithFrame:NSMakeRect(x,y,width,height)] autorelease];
+
+    
+    for(NSString *x in items) {
+        id *tabwidget = [[[NSTabViewItem alloc] initWithIdentifier: x ] autorelease];
+        [tabwidget setLabel: x];
+        [widget addTabViewItem: tabwidget];
+    }
+    
+	[[parent contentView] addSubview:widget];
+	return widget;
+}
+
+void addTab(id parent, const char *name) {
+    NSString *str = [NSString stringWithUTF8String:name];
+    NSArray *items = [str componentsSeparatedByString: @"|"];
+
+    for(NSString *x in items){
+        id *widget = [[[NSTabViewItem alloc] initWithIdentifier: x ] autorelease];
+        [widget setLabel: x];
+        [parent addTabViewItem: widget];
+    }
+}