Implemented TextField.OnChanged() on Mac OS X.

redo/basicctrls_darwin.m

@@ -9,7 +9,7 @@
 #define toNSView(x) ((NSView *) (x))
 #define toNSBox(x) ((NSBox *) (x))
 
-@interface goControlDelegate : NSObject {
+@interface goControlDelegate : NSObject <NSTextFieldDelegate> {
 @public
 	void *gocontrol;
 }
@@ -27,6 +27,11 @@
 	checkboxToggled(self->gocontrol);
 }
 
+- (void)controlTextDidChange:(NSNotification *)note
+{
+	textfieldChanged(self->gocontrol);
+}
+
 @end
 
 id newButton(void)
@@ -136,6 +141,15 @@ id newPasswordField(void)
 	return finishNewTextField(toNSTextField(t), YES);
 }
 
+void textfieldSetDelegate(id textfield, void *t)
+{
+	goControlDelegate *d;
+
+	d = [goControlDelegate new];
+	d->gocontrol = t;
+	[toNSTextField(textfield) setDelegate:d];
+}
+
 // also good for labels
 const char *textFieldText(id t)
 {

redo/objc_darwin.h

@@ -68,6 +68,7 @@ extern BOOL checkboxChecked(id);
 extern void checkboxSetChecked(id, BOOL);
 extern id newTextField(void);
 extern id newPasswordField(void);
+extern void textfieldSetDelegate(id, void *);
 extern const char *textFieldText(id);
 extern void textFieldSetText(id, char *);
 extern id newLabel(void);

redo/textfield_darwin.go

@@ -11,12 +11,16 @@ import "C"
 
 type textfield struct {
 	_id		C.id
+	changed	*event
 }
 
 func newTextField() *textfield {
-	return &textfield{
+	t := &textfield{
 		_id:			C.newTextField(),
+		changed:		newEvent(),
 	}
+	C.textfieldSetDelegate(t._id, unsafe.Pointer(t))
+	return t
 }
 
 func newPasswordField() *textfield {
@@ -35,6 +39,21 @@ func (t *textfield) SetText(text string) {
 	C.textFieldSetText(t._id, ctext)
 }
 
+func (t *textfield) OnChanged(f func()) {
+	t.changed.set(f)
+}
+
+func (t *textfield) Invalid(reason string) {
+	// TODO
+}
+
+//export textfieldChanged
+func textfieldChanged(data unsafe.Pointer) {
+	t := (*textfield)(data)
+println("changed")
+	t.changed.fire()
+}
+
 func (t *textfield) id() C.id {
 	return t._id
 }