Added (untested; VM issues) code to handle Mac OS X Quit Dock menu items and other related stuff that may happen in the future. Will drop the TODO after I can test it.

bleh_darwin.m

@@ -20,6 +20,7 @@ though this is not always the case.
 #include <AppKit/NSGraphics.h>
 #include <AppKit/NSBitmapImageRep.h>
 #include <AppKit/NSCell.h>
+#include <AppKit/NSApplication.h>
 
 /* used by listbox_darwin.go; requires NSString */
 id *_NSObservedObjectKey = (id *) (&NSObservedObjectKey);
@@ -241,7 +242,8 @@ static void __areaView_drawRect(id self, SEL sel, NSRect r)
 
 void *_areaView_drawRect = (void *) __areaView_drawRect;
 
-/* the only objective-c feature you'll see here
+/*
+this and one below it are the only objective-c feature you'll see here
 
 unfortunately NSRect both varies across architectures and is passed as just a structure, so its encoding has to be computed at compile time
 because @encode() is NOT A LITERAL, we're going to just stick it all the way back in objc_darwin.go
@@ -327,3 +329,19 @@ void objc_setFont(id what, unsigned int csize)
 	objc_msgSend(what, s_setFont,
 		objc_msgSend(c_NSFont, s_systemFontOfSize, size));
 }
+
+/*
+-[NSApplicationDelegate applicationShouldTerminate] used to return a BOOL, but now returns a NSApplicationTerminateReply, which is a NSUInteger; hence, here.
+*/
+
+extern void appDelegate_applicationShouldTerminate();
+
+static NSApplicationTerminateReply __appDelegate_applicationShouldTerminate(id self, SEL sel)
+{
+	appDelegate_applicationShouldTerminate();
+	return NSTerminateCancel;		// don't quit
+}
+
+void *_appDelegate_applicationShouldTerminate = (void *) __appDelegate_applicationShouldTerminate;
+
+char *encodedTerminateReply = @encode(NSApplicationTerminateReply);

delegate_darwin.go

@@ -12,6 +12,7 @@ This creates a class goAppDelegate that will be used as the delegate for /everyt
 	- handles window close events (windowShouldClose:)
 	- handles window resize events (windowDidResize:)
 	- handles button click events (buttonClicked:)
+	- handles the application-global Quit event (such as from the Dock) (applicationShouldTerminate)
 */
 
 // #cgo LDFLAGS: -lobjc -framework Foundation -framework AppKit
@@ -45,6 +46,8 @@ var appDelegateSels = []selector{
 		"handling window resize events"},
 	selector{"buttonClicked:", uintptr(C.appDelegate_buttonClicked), sel_bool_id,
 		"handling button clicks"},
+	selector{"applicationShouldTerminate", uintptr(C._appDelegate_applicationShouldTerminate), sel_terminatereply,
+		"handling Quit menu items (such as from the Dock)/the AppQuit channel"},
 }
 
 func mkAppDelegate() error {
@@ -94,3 +97,12 @@ func appDelegate_buttonClicked(self C.id, sel C.SEL, button C.id) {
 	sysData := getSysData(button)
 	sysData.signal()
 }
+
+//export appDelegate_applicationShouldTerminate
+func appDelegate_applicationShouldTerminate() {
+	// asynchronous so as to return control to the event loop
+	go func() {
+		AppQuit <- struct{}{}
+	}()
+	// xxx in bleh_darwin.m tells Cocoa not to quit
+}

doc.go

@@ -20,6 +20,7 @@ Here is a simple, complete program that asks the user for their name and greets
 
 	func myMain() {
 		w := ui.NewWindow("Hello", 400, 100)
+		ui.AppQuit = w.Closing		// treat quitting the application like closing the main window
 		nameField := ui.NewLineEdit("Enter Your Name Here")
 		button := ui.NewButton("Click Here For a Greeting")
 		err := w.Open(ui.NewVerticalStack(nameField, button))
@@ -29,7 +30,7 @@ Here is a simple, complete program that asks the user for their name and greets
 
 		for {
 			select {
-			case <-w.Closing:		// user tries to close the window
+			case <-w.Closing:		// user tries to close the window or quit the program
 				return
 			case <-button.Clicked:	// user clicked the button
 				ui.MsgBox("Hello, " + nameField.Text() + "!", "")

init.go

@@ -14,3 +14,14 @@ package ui
 func Go(main func()) error {
 	return ui(main)
 }
+
+// AppQuit is pulsed when the user decides to quit the program if their operating system provides a facility for quitting an entire application, rather than merely close all windows (for instance, Mac OS X via the Dock icon).
+// You should assign one of your Windows's Closing to this variable so the user choosing to quit the application is treated the same as closing that window.
+// If you do not respond to this signal, nothing will happen.
+// Do not merely check this channel alone; it is not guaranteed to be pulsed on all systems or in all conditions.
+var AppQuit chan struct{}
+
+func init() {
+	// don't expose this in the documentation
+	AppQuit = newEvent()
+}

objc_darwin.go

@@ -71,14 +71,16 @@ const (
 	sel_bool_id
 	sel_bool
 	sel_void_rect
+	sel_terminatereply
 	nitypes
 )
 
 var itypes = [nitypes][]C.char{
-	sel_void_id:	[]C.char{'v', '@', ':', '@', 0},
-	sel_bool_id:	[]C.char{'c', '@', ':', '@', 0},
-	sel_bool:		[]C.char{'c', '@', ':', 0},
-	sel_void_rect:	nil,			// see init() below
+	sel_void_id:		[]C.char{'v', '@', ':', '@', 0},
+	sel_bool_id:		[]C.char{'c', '@', ':', '@', 0},
+	sel_bool:			[]C.char{'c', '@', ':', 0},
+	sel_void_rect:		nil,			// see init() below
+	sel_terminatereply:	nil,
 }
 
 func init() {
@@ -91,6 +93,14 @@ func init() {
 	}
 	x = append(x, 0)
 	itypes[sel_void_rect] = x
+
+	x = make([]C.char, 0, 256)	// more than enough
+	y = C.GoString(C.encodedTerminateReply)
+	for _, b := range y {
+		x = append(x, C.char(b))
+	}
+	x = append(x, '@', ':', 0)
+	itypes[sel_terminatereply] = x
 }
 
 func makeClass(name string, super C.id, sels []selector, desc string) (id C.id, err error) {

objc_darwin.h

@@ -117,8 +117,12 @@ extern struct xpoint getTranslatedEventPoint(id, id);
 
 /* for objc_darwin.go */
 extern char *encodedNSRect;
+extern char *encodedTerminateReply;
 
 /* for sysdata_darwin.go */
 extern void objc_setFont(id, unsigned int);
 
+/* for delegate_darwin.go */
+extern void *_appDelegate_applicationShouldTerminate;
+
 #endif

test/main.go

@@ -282,6 +282,9 @@ _=curtime
 		case <-w.Closing:
 			println("window closed event received")
 			break mainloop
+		case <-AppQuit:
+			println("application quit event received")
+			break mainloop
 		case <-b.Clicked:
 			w.SetTitle(fmt.Sprintf("%v | %s | %s | %s | %s",
 				c.Checked(),