From bbb37bb2a6446e555dd92572e8e27157d1a7f7f4 Mon Sep 17 00:00:00 2001
From: Pietro Gagliardi <pietro10@mac.com>
Date: Sat, 1 Mar 2014 21:34:37 -0500
Subject: [PATCH] Added Mac OS X Buttons. Code hangs due to a preferredSize()
 issue...

---
 delegate_darwin.go | 15 ++++++++++++++-
 sysdata_darwin.go  | 23 +++++++++++++++++++++++
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/delegate_darwin.go b/delegate_darwin.go
index 8d27281..5c33e39 100644
--- a/delegate_darwin.go
+++ b/delegate_darwin.go
@@ -11,7 +11,7 @@ This creates a class goAppDelegate that will be used as the delegate for /everyt
 	- runs uitask requests (uitask:)
 	- handles window close events (windowShouldClose:)
 	- handles window resize events (windowDidResize: (TODO also windowDidEndLiveResize:?))
-	- handles button click events (buttonClick:)
+	- handles button click events (buttonClicked:)
 */
 
 // #cgo LDFLAGS: -lobjc -framework Foundation -framework AppKit
@@ -20,6 +20,7 @@ This creates a class goAppDelegate that will be used as the delegate for /everyt
 // extern void appDelegate_uitask(id, SEL, id);		/* from uitask_darwin.go */
 // extern BOOL appDelegate_windowShouldClose(id, SEL, id);
 // extern void appDelegate_windowDidResize(id, SEL, id);
+// extern void appDelegate_buttonClicked(id, SEL, id);
 import "C"
 
 var (
@@ -34,6 +35,7 @@ var (
 	_uitask = sel_getUid("uitask:")
 	_windowShouldClose = sel_getUid("windowShouldClose:")
 	_windowDidResize = sel_getUid("windowDidResize:")
+	_buttonClicked = sel_getUid("buttonClicked:")
 )
 
 func mkAppDelegate() error {
@@ -56,6 +58,11 @@ func mkAppDelegate() error {
 	if err != nil {
 		return fmt.Errorf("error adding NSApplication delegate windowDidResize: method (to handle window resize events): %v", err)
 	}
+	err = addDelegateMethod(appdelegateclass, _buttonClicked,
+		C.appDelegate_buttonClicked, delegate_void)
+	if err != nil {
+		return fmt.Errorf("error adding NSApplication delegate buttonClicked: method (to handle button clicks): %v", err)
+	}
 	// TODO using objc_new() causes a segfault; find out why
 	// TODO make alloc followed by init (I thought NSObject provided its own init?)
 	appDelegate = objc_alloc(objc_getClass(_goAppDelegate))
@@ -86,6 +93,12 @@ func appDelegate_windowDidResize(self C.id, sel C.SEL, notification C.id) {
 	}
 }
 
+//export appDelegate_buttonClicked
+func appDelegate_buttonClicked(self C.id, sel C.SEL, button C.id) {
+	sysData := getSysData(button)
+	sysData.signal()
+}
+
 // this actually constructs the delegate class
 
 var (
diff --git a/sysdata_darwin.go b/sysdata_darwin.go
index 37352a3..1b99dce 100644
--- a/sysdata_darwin.go
+++ b/sysdata_darwin.go
@@ -27,8 +27,10 @@ type classData struct {
 
 var (
 	_NSWindow = objc_getClass("NSWindow")
+	_NSButton = objc_getClass("NSButton")
 
 	_initWithContentRect = sel_getUid("initWithContentRect:styleMask:backing:defer:")
+	_initWithFrame = sel_getUid("initWithFrame:")
 	_makeKeyAndOrderFront = sel_getUid("makeKeyAndOrderFront:")
 	_orderOut = sel_getUid("orderOut:")
 	_setHidden = sel_getUid("setHidden:")
@@ -41,6 +43,11 @@ var (
 	// TODO others
 	_frame = sel_getUid("frame")
 	_setFrameDisplay = sel_getUid("setFrame:display:")
+	_setBezelStyle = sel_getUid("setBezelStyle:")
+	_setTarget = sel_getUid("setTarget:")
+	_setAction = sel_getUid("setAction:")
+	_contentView = sel_getUid("contentView")
+	_addSubview = sel_getUid("addSubview:")
 )
 
 func controlShow(what C.id) {
@@ -84,6 +91,22 @@ var classTypes = [nctypes]*classData{
 		textsel:		_title,
 	},
 	c_button:			&classData{
+		make:		func(parentWindow C.id) C.id {
+			button := objc_alloc(_NSButton)
+			// NSControl requires that we specify a frame; dummy frame for now
+			button = objc_msgSend_rect(button, _initWithFrame,
+				0, 0, 100, 100)
+			objc_msgSend_uint(button, _setBezelStyle, 1)		// NSRoundedBezelStyle
+			C.objc_msgSend_id(button, _setTarget, appDelegate)
+			C.objc_msgSend_sel(button, _setAction, _buttonClicked)
+			windowView := C.objc_msgSend_noargs(parentWindow, _contentView)
+			C.objc_msgSend_id(windowView, _addSubview, button)
+			return button
+		},
+		show:		controlShow,
+		hide:			controlHide,
+		settextsel:		_setTitle,
+		textsel:		_title,
 	},
 	c_checkbox:		&classData{
 	},