Implemented window closing on Mac OS X. This drops the "single delegate object for everything" setup but keeping that map and holding its lock is already meh so.

redo/objc_darwin.h

@@ -18,7 +18,7 @@ extern void issue(void *);
 
 /* window_darwin.m */
 extern id newWindow(intptr_t, intptr_t);
-extern void windowSetAppDelegate(id);
+extern void windowSetDelegate(id, void *);
 extern const char *windowTitle(id);
 extern void windowSetTitle(id, const char *);
 extern void windowShow(id);

redo/window_darwin.go

@@ -23,11 +23,12 @@ func newWindow(title string, width int, height int) *Request {
 			ctitle := C.CString(title)
 			defer C.free(unsafe.Pointer(ctitle))
 			C.windowSetTitle(id, ctitle)
-			C.windowSetAppDelegate(id)
-			c <- &window{
+			w := &window{
 				id:		id,
 				closing:	newEvent(),
 			}
+			C.windowSetDelegate(id, unsafe.Pointer(w))
+			c <- w
 		},
 		resp:		c,
 	}
@@ -112,7 +113,17 @@ func (w *window) OnClosing(e func(c Doer) bool) *Request {
 	}
 }
 
-// TODO windowClosing
+//export windowClosing
+func windowClosing(xw unsafe.Pointer) C.BOOL {
+	w := (*window)(unsafe.Pointer(xw))
+	close := w.closing.fire()
+	if close {
+		// TODO make sure this actually closes the window the way we want
+		return C.YES
+	}
+	return C.NO
+}
+	
 
 // TODO for testing
 func newButton(string) *Request { return nil }

redo/window_darwin.m

@@ -6,6 +6,22 @@
 
 #define toNSWindow(x) ((NSWindow *) (x))
 
+// TODO why do I need the explicit interface specification?
+@interface goWindowDelegate : NSObject <NSWindowDelegate> {
+@public
+	void *gowin;
+}
+@end
+
+@implementation goWindowDelegate
+
+- (BOOL)windowShouldClose:(id)win
+{
+	return windowClosing(self->gowin);
+}
+
+@end
+
 id newWindow(intptr_t width, intptr_t height)
 {
 	return [[NSWindow alloc] initWithContentRect:NSMakeRect(0, 0, (CGFloat) width, (CGFloat) height)
@@ -14,9 +30,13 @@ id newWindow(intptr_t width, intptr_t height)
 		defer:YES];
 }
 
-void windowSetAppDelegate(id win)
+void windowSetDelegate(id win, void *w)
 {
-	[toNSWindow(win) setDelegate:getAppDelegate()];
+	goWindowDelegate *d;
+
+	d = [goWindowDelegate new];
+	d->gowin = w;
+	[toNSWindow(win) setDelegate:d];
 }
 
 const char *windowTitle(id win)