Added a button to the darwin test and had it respond to clicks. Committing as is because without a bezelStyle ther esult is just... wow. 1990s Windows look and feel for the win?

darwintest/newtypes.go

@@ -14,6 +14,7 @@ import (
 // #include <objc/runtime.h>
 // extern void windowShouldClose(id, SEL, id);
 // extern id objc_msgSend_id(id, SEL, id);
+// extern void buttonClicked(id, SEL, id);
 // /* cgo doesn't like Nil */
 // extern Class NilClass; /* in runtimetest.go because of cgo limitations */
 import "C"
@@ -39,7 +40,12 @@ func windowShouldClose(self C.id, sel C.SEL, sender C.id) {
 		sender)
 }
 
-func addOurMethod(class C.Class, sel C.SEL) {
+//export buttonClicked
+func buttonClicked(self C.id, sel C.SEL, sender C.id) {
+	fmt.Println("button clicked")
+}
+
+func addOurMethod(class C.Class, sel C.SEL, imp C.IMP) {
 //	ty := []C.char{'v', '@', ':', 0}		// according to the example for class_addMethod()
 	ty := []C.char{'v', '@', ':', '@', 0}
 
@@ -48,17 +54,20 @@ func addOurMethod(class C.Class, sel C.SEL) {
 //	ok := C.class_addMethod(metaclass,
 	ok := C.class_addMethod(class,
 		sel,
-		// using &C.ourMethod causes faults for some reason
+		imp,
-		C.IMP(unsafe.Pointer(C.windowShouldClose)),
 		&ty[0])
 	if ok == C.BOOL(C.NO) {
 		panic("unable to add ourMethod")
 	}
 }
 
-func mk(name string, sel C.SEL) C.id {
+func mk(name string, selW C.SEL, selB C.SEL) C.id {
 	class := newClass(name)
-	addOurMethod(class, sel)
+	addOurMethod(class, selW,
+	// using &C.ourMethod causes faults for some reason
+		C.IMP(unsafe.Pointer(C.windowShouldClose)))
 	C.objc_registerClassPair(class)
+	addOurMethod(class, selB,
+		C.IMP(unsafe.Pointer(C.buttonClicked)))
 	return objc_getClass(name)
 }

darwintest/runtimetest.go

@@ -21,6 +21,8 @@ import (
 // id objc_msgSend_strarg(id obj, SEL sel, char *a) { return objc_msgSend(obj, sel, a); }
 // id objc_msgSend_NSRect_uint_uint_bool(id obj, SEL sel, CGRect a, NSUInteger b, NSUInteger c, BOOL d) { return objc_msgSend(obj, sel, a, b, c, d); }
 // id objc_msgSend_id(id obj, SEL sel, id a) { return objc_msgSend(obj, sel, a); }
+// id objc_msgSend_NSRect(id obj, SEL sel, CGRect a) { return objc_msgSend(obj, sel, a); }
+// id objc_msgSend_sel(id obj, SEL sel, SEL a) { return objc_msgSend(obj, sel, a); }
 // Class NilClass = Nil; /* for newtypes.go */
 import "C"
 
@@ -46,8 +48,9 @@ func init() {
 	sharedApplication := sel_getUid("sharedApplication")
 	NSApp = C.objc_msgSend_noargs(NSApplication, sharedApplication)
 
-	sel := sel_getUid("windowShouldClose:")
+	selW := sel_getUid("windowShouldClose:")
-	mk("hello", sel)
+	selB := sel_getUid("buttonClicked:")
+	mk("hello", selW, selB)
 }
 
 const (
@@ -89,6 +92,27 @@ func main() {
 		alloc)
 	C.objc_msgSend_id(window, setDelegate,
 		delegate)
+	windowView := C.objc_msgSend_noargs(window,
+		sel_getUid("contentView"))
+
+	NSButton := objc_getClass("NSButton")
+	button := C.objc_msgSend_noargs(NSButton, alloc)
+	button = C.objc_msgSend_NSRect(button,
+		sel_getUid("initWithFrame:"),
+		C.CGRect{
+			origin:	C.CGPoint{20, 20},
+			size:		C.CGSize{200, 200},
+		})
+	C.objc_msgSend_id(button,
+		sel_getUid("setTarget:"),
+		delegate)
+	C.objc_msgSend_sel(button,
+		sel_getUid("setAction:"),
+		sel_getUid("buttonClicked:"))
+	C.objc_msgSend_id(windowView,
+		sel_getUid("addSubview:"),
+		button)
+
 	C.objc_msgSend_noargs(NSApp,
 		sel_getUid("run"))
 }