Switched Tab on Mac OS X to use a dedicated container type system. This container type will eventually be the new home of all the sizer stuff. Now to remove the dedicated NSTabView stuff...

redo/container_darwin.go

@@ -0,0 +1,31 @@
+// 4 august 2014
+
+package ui
+
+import (
+	"unsafe"
+)
+
+// #include "objc_darwin.h"
+import "C"
+
+type container struct {
+	view		C.id
+	*sizer
+}
+
+func newContainer(child Control) *container {
+	c := &container{
+		sizer:	new(sizer),
+	}
+	c.view = C.newContainerView(unsafe.Pointer(c))
+	c.child = child
+	c.child.setParent(&controlParent{c.view})
+	return c
+}
+
+//export containerResized
+func containerResized(data unsafe.Pointer, width C.intptr_t, height C.intptr_t) {
+	c := (*container)(unsafe.Pointer(data))
+	c.resize(0, 0, int(width), int(height))
+}

redo/container_darwin.m

@@ -0,0 +1,33 @@
+// 4 august 2014
+
+#include "objc_darwin.h"
+#include "_cgo_export.h"
+#include <Cocoa/Cocoa.h>
+
+// calling -[className] on the content views of NSWindow, NSTabItem, and NSBox all return NSView, so I'm assuming I just need to override these
+// fortunately, in the case of NSTabView, this -[setFrame:] is called when resizing and when changing tabs, so we can indeed use this directly there
+@interface goContainerView : NSView {
+@public
+	void *gocontainer;
+}
+@end
+
+@implementation goContainerView
+
+- (void)setFrame:(NSRect)r
+{
+	[super setFrame:r];
+	if (self->gocontainer != NULL)
+		containerResized(self->gocontainer, (intptr_t) r.size.width, (intptr_t) r.size.height);
+}
+
+@end
+
+id newContainerView(void *gocontainer)
+{
+	goContainerView *c;
+
+	c = [[goContainerView alloc] initWithFrame:NSMakeRect(0, 0, 100, 100)];
+	c->gocontainer = gocontainer;
+	return (id) c;
+}

redo/objc_darwin.h

@@ -55,7 +55,7 @@ extern void moveControl(id, intptr_t, intptr_t, intptr_t, intptr_t);
 
 /* tab_darwin.m */
 extern id newTab(void *);
-extern id tabAppend(id, char *);
+extern void tabAppend(id, char *, id);
 
 /* table_darwin.m */
 extern id newTable(void);
@@ -87,4 +87,7 @@ extern struct xsize areaPrefSize(id);
 extern struct xalignment alignmentInfo(id, struct xrect);
 extern struct xrect frame(id);
 
+/* container_darwin.m */
+extern id newContainerView(void *);
+
 #endif

redo/tab_darwin.go

@@ -11,7 +11,7 @@ import "C"
 
 type tab struct {
 	_id		C.id
-	tabs		[]*sizer
+	tabs		[]*container
 }
 
 func newTab() Tab {
@@ -21,22 +21,20 @@ func newTab() Tab {
 }
 
 func (t *tab) Append(name string, control Control) {
-	s := new(sizer)
+	c := newContainer(control)
-	t.tabs = append(t.tabs, s)
+	t.tabs = append(t.tabs, c)
 	cname := C.CString(name)
 	defer C.free(unsafe.Pointer(cname))
-	tabview := C.tabAppend(t._id, cname)
+	C.tabAppend(t._id, cname, c.view)
-	s.child = control
-	s.child.setParent(&controlParent{tabview})
 }
 
 //export tabResized
 func tabResized(data unsafe.Pointer, width C.intptr_t, height C.intptr_t) {
-	t := (*tab)(unsafe.Pointer(data))
+//	t := (*tab)(unsafe.Pointer(data))
-	for _, s := range t.tabs {
+//	for _, c := range t.tabs {
 		// the tab area's coordinate system is localized, so the origin is (0, 0)
-		s.resize(0, 0, int(width), int(height))
+//		c.resize(0, 0, int(width), int(height))
-	}
+//	}
 }
 
 func (t *tab) id() C.id {

redo/tab_darwin.m

@@ -5,6 +5,7 @@
 #import <Cocoa/Cocoa.h>
 
 #define toNSTabView(x) ((NSTabView *) (x))
+#define toNSView(x) ((NSView *) (x))
 
 @interface goTabView : NSTabView {
 @public
@@ -35,12 +36,12 @@ id newTab(void *gotab)
 	return (id) t;
 }
 
-id tabAppend(id t, char *name)
+void tabAppend(id t, char *name, id view)
 {
 	NSTabViewItem *i;
 
 	i = [[NSTabViewItem alloc] initWithIdentifier:nil];
 	[i setLabel:[NSString stringWithUTF8String:name]];
+	[i setView:toNSView(view)];
 	[toNSTabView(t) addTabViewItem:i];
-	return (id) [i view];
 }