Added the other Combobox modification functions to the Mac OS X backend. Before continuing, I'll get messageboxes working...

bleh_darwin.m

@@ -36,6 +36,11 @@ id objc_msgSend_int(id obj, SEL sel, intptr_t a)
 	return objc_msgSend(obj, sel, (NSInteger) a);
 }
 
+id objc_msgSend_id_int(id obj, SEL sel, id a, intptr_t b)
+{
+	return objc_msgSend(obj, sel, a, (NSInteger) b);
+}
+
 /*
 These are the objc_msgSend() wrappers around NSRect. The problem is that while on 32-bit systems, NSRect is a concrete structure, on 64-bit systems it's just a typedef to CGRect. While in practice just using CGRect everywhere seems to work, better to be safe than sorry.
 

objc_darwin.h

@@ -79,6 +79,7 @@ extern id objc_msgSend_int(id obj, SEL sel, intptr_t a);
 
 m2(id_id, id, id)
 extern id _objc_msgSend_rect_bool(id obj, SEL sel, int64_t x, int64_t y, int64_t w, int64_t h, BOOL b);
+extern id objc_msgSend_id_int(id obj, SEL sel, id a, intptr_t b);
 
 m3(id_id_id, id, id, id)
 m3(sel_id_bool, SEL, id, BOOL)

sysdata_darwin.go

@@ -25,6 +25,9 @@ type classData struct {
 	textsel		C.SEL
 	alttextsel		C.SEL
 	append		func(id C.id, what string, alternate bool)
+	insertBefore	func(id C.id, what string, before int, alternate bool)
+	// TODO others
+	delete		func(id C.id, index int)
 }
 
 var (
@@ -169,6 +172,17 @@ var classTypes = [nctypes]*classData{
 				C.objc_msgSend_id(id, _addItemWithTitle, str)
 			}
 		},
+		insertBefore:	func(id C.id, what string, before int, alternate bool) {
+			str := toNSString(what)
+			if alternate {
+				C.objc_msgSend_id_int(id, _insertItemWithObjectValueAtIndex, str, C.intptr_t(before))
+			} else {
+				C.objc_msgSend_id_int(id, _insertItemWithTitleAtIndex, str, C.intptr_t(before))
+			}
+		},
+		delete:		func(id C.id, index int) {
+			C.objc_msgSend_int(id, _removeItemAtIndex, C.intptr_t(index))
+		},
 	},
 	c_lineedit:		&classData{
 	},
@@ -315,7 +329,14 @@ if classTypes[s.ctype].append == nil { return nil }
 }
 
 func (s *sysData) insertBefore(what string, before int) error {
-	// TODO
+if classTypes[s.ctype].insertBefore == nil { return nil }
+	ret := make(chan struct{})
+	defer close(ret)
+	uitask <- func() {
+		classTypes[s.ctype].insertBefore(s.id, what, before, s.alternate)
+		ret <- struct{}{}
+	}
+	<-ret
 	return nil
 }
 
@@ -350,7 +371,14 @@ func (s *sysData) setWindowSize(width int, height int) error {
 }
 
 func (s *sysData) delete(index int) error {
-	// TODO
+if classTypes[s.ctype].delete == nil { return nil }
+	ret := make(chan struct{})
+	defer close(ret)
+	uitask <- func() {
+		classTypes[s.ctype].delete(s.id, index)
+		ret <- struct{}{}
+	}
+	<-ret
 	return nil
 }
 

todo.md

@@ -28,6 +28,7 @@ important things:
 - Cocoa coordinates have (0,0) at the bottom left: need to fix this somehow
 - I think Cocoa NSButton text is not vertically aligned properly...?
 - resizing Cocoa windows does not redraw controls correctly
+- figure out what to do about deleting a nonexistent item; each backend responds differently by default
 - there's no GTK+ error handling whatsoever; we need to figure out how it works
 - make sure GTK+ documentation point differences don't matter
 - button sizes and LineEdit sizes on Windows seem too big; Comboboxes have margins