From e4b379f84a8cb3699c8580f30af88d56be180a4d Mon Sep 17 00:00:00 2001
From: Pietro Gagliardi <pietro10@mac.com>
Date: Thu, 17 Jul 2014 12:02:39 -0400
Subject: [PATCH] Added button click events to the Mac OS X backend.

---
 redo/controls_darwin.go | 23 ++++++++++++++++++++---
 redo/controls_darwin.m  | 25 +++++++++++++++++++++++++
 redo/objc_darwin.h      |  1 +
 redo/zz_test.go         |  3 +++
 4 files changed, 49 insertions(+), 3 deletions(-)

diff --git a/redo/controls_darwin.go b/redo/controls_darwin.go
index 91dcb65..376c430 100644
--- a/redo/controls_darwin.go
+++ b/redo/controls_darwin.go
@@ -47,6 +47,7 @@ func (w *widgetbase) parent(win *window) {
 
 type button struct {
 	*widgetbase
+	clicked		*event
 }
 
 func newButton(text string) *Request {
@@ -55,17 +56,33 @@ func newButton(text string) *Request {
 		op:		func() {
 			ctext := C.CString(text)
 			defer C.free(unsafe.Pointer(ctext))
-			c <- &button{
+			b := &button{
 				widgetbase:	newWidget(C.newButton(ctext)),
+				clicked:		newEvent(),
 			}
+			C.buttonSetDelegate(b.id, unsafe.Pointer(b))
+			c <- b
 		},
 		resp:		c,
 	}
 }
 
 func (b *button) OnClicked(e func(c Doer)) *Request {
-	// TODO
-	return nil
+	c := make(chan interface{})
+	return &Request{
+		op:		func() {
+			b.clicked.set(e)
+			c <- struct{}{}
+		},
+		resp:		c,
+	}
+}
+
+//export buttonClicked
+func buttonClicked(xb unsafe.Pointer) {
+	b := (*button)(unsafe.Pointer(xb))
+	b.clicked.fire()
+	println("button clicked")
 }
 
 func (b *button) Text() *Request {
diff --git a/redo/controls_darwin.m b/redo/controls_darwin.m
index a21ac0f..d8e0e51 100644
--- a/redo/controls_darwin.m
+++ b/redo/controls_darwin.m
@@ -22,6 +22,21 @@ void parent(id control, id parentid, BOOL floating)
 		[toNSView(control) release];
 }
 
+@interface goControlDelegate : NSObject {
+@public
+	void *gocontrol;
+}
+@end
+
+@implementation goControlDelegate
+
+- (IBAction)buttonClicked:(id)sender
+{
+	buttonClicked(self->gocontrol);
+}
+
+@end
+
 id newButton(char *text)
 {
 	NSButton *b;
@@ -36,6 +51,16 @@ id newButton(char *text)
 	return b;
 }
 
+void buttonSetDelegate(id button, void *b)
+{
+	goControlDelegate *d;
+
+	d = [goControlDelegate new];
+	d->gocontrol = b;
+	[toNSButton(button) setTarget:d];
+	[toNSButton(button) setAction:@selector(buttonClicked:)];
+}
+
 const char *buttonText(id button)
 {
 	return [[toNSButton(button) title] UTF8String];
diff --git a/redo/objc_darwin.h b/redo/objc_darwin.h
index b44461a..b1942de 100644
--- a/redo/objc_darwin.h
+++ b/redo/objc_darwin.h
@@ -30,6 +30,7 @@ extern void windowClose(id);
 extern void unparent(id);
 extern void parent(id, id, BOOL);
 extern id newButton(char *);
+extern void buttonSetDelegate(id, void *);
 extern const char *buttonText(id);
 extern void buttonSetText(id, char *);
 
diff --git a/redo/zz_test.go b/redo/zz_test.go
index fb17ef7..c916252 100644
--- a/redo/zz_test.go
+++ b/redo/zz_test.go
@@ -20,6 +20,9 @@ func init() {
 			done <- struct{}{}
 			return true
 		}))
+		Wait(Do, b.OnClicked(func(c Doer) {
+			println("in OnClicked()")
+		}))
 		Wait(Do, w.Show())
 		<-done
 	}()