Added the Mac OS X uiContainer. Added it to uiWindow. Added the Mac OS X coordinate system mirroring to the new control logic. Renamed *_darwin.c to *_darwin.m.

new/container_darwin.m

@@ -0,0 +1,22 @@
+// 4 august 2014
+#import "uipriv_darwin.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
+// fornunately:
+// - NSWindow resizing calls -[setFrameSize:] (but not -[setFrame:])
+// - NSTab resizing calls both -[setFrame:] and -[setFrameSIze:] on the current tab
+// - NSTab switching tabs calls both -[setFrame:] and -[setFrameSize:] on the new tab
+// so we just override setFrameSize:
+// thanks to mikeash and JtRip in irc.freenode.net/#macdev
+@implementation uiContainer
+
+- (void)setFrameSize:(NSSize)s
+{
+	uiSizing d;
+
+	[super setFrameSize:s];
+	if (self.child != NULL)
+		(*(self.child->resize))(self.child, 0, 0, [self bounds].size.width, [self bounds].size.height, d);
+}
+
+@end

new/newcontrol_darwin.m

@@ -39,7 +39,8 @@ static void singleResize(uiControl *c, intmax_t x, intmax_t y, intmax_t width, i
 	NSRect frame;
 
 	frame.origin.x = x;
-	frame.origin.y = y;
+	// mac os x coordinate system has (0,0) in the lower-left
+	frame.origin.y = [[S(c)->immediate superview] bounds].size.height - y;
 	frame.size.width = width;
 	frame.size.height = height;
 	frame = [S(c)->immediate frameForAlignmentRect:frame];

new/uipriv_darwin.h

@@ -11,3 +11,8 @@
 extern void *uiAlloc(size_t);
 extern void *uiRealloc(void *, size_t);
 extern void uiFree(void *);
+
+// container_darwin.m
+@interface uiContainer : NSView
+@property uiControl *child;
+@end

new/window_darwin.m

@@ -22,6 +22,8 @@
 
 struct uiWindow {
 	NSWindow *w;
+	uiContainer *container;
+	uiControl *child;
 	uiWindowDelegate *d;
 };
 
@@ -43,6 +45,9 @@ uiWindow *uiNewWindow(char *title, int width, int height)
 	[w->w setTitle:toNSString(title)];
 	// TODO substitutions
 
+	w->container = [[uiContainer alloc] initWithFrame:NSZeroRect];
+	[w->w setContentView:((NSView *) w->container)];
+
 	w->d = [uiWindowDelegate new];
 	w->d.w = w;
 	w->d.onClosing = defaultOnClosing;
@@ -79,3 +84,9 @@ void uiWindowOnClosing(uiWindow *w, int (*f)(uiWindow *, void *), void *data)
 	w->d.onClosing = f;
 	w->d.onClosingData = data;
 }
+
+void uiWindowSetChild(uiWindow *w, uiControl *c)
+{
+	w->child = c;
+	(*(w->child->setParent))(w->child, (uintptr_t) (w->container));
+}