button: Add SetImage

button.go

@@ -3,9 +3,12 @@ package gocoa
 // #cgo CFLAGS: -x objective-c
 // #cgo LDFLAGS: -framework Cocoa
 // #import "button.h"
+// #import "image.h"
+// #include <stdlib.h>
 import "C"
 import (
  "fmt"
+ "image"
  "unsafe"
 )
 
@@ -147,3 +150,10 @@ func (btn *Button) OnClick(fn func()) {
 func (btn *Button) Remove() {
  C.Button_Remove(btn.buttonPtr)
 }
+
+func (btn *Button) SetImage(img *image.RGBA) {
+ bytes := C.CBytes(img.Pix)
+ nsImage := C.Image_NewWithRGBA(C.int(img.Bounds().Dx()), C.int(img.Bounds().Dy()), (*C.uchar)(bytes))
+ C.Button_SetImage(btn.buttonPtr, nsImage)
+ C.free(bytes)
+}

button.h

@@ -1,3 +1,4 @@
+#import "image.h"
 #import <Cocoa/Cocoa.h>
 
 // typedef void (*callback)(void);
@@ -25,3 +26,4 @@ void Button_SetBorderColor(ButtonPtr btnPtr, int r, int g, int b, int a);
 void Button_SetBorderWidth(ButtonPtr btnPtr, int borderWidth);
 void Button_SetState(ButtonPtr btnPtr, int state);
 int Button_State(ButtonPtr btnPtr);
+void Button_SetImage(ButtonPtr btnPtr, ImagePtr imagePtr);

button.m

@@ -108,3 +108,9 @@ int Button_State(ButtonPtr btnPtr) {
  return 3;
  }
 }
+
+void Button_SetImage(ButtonPtr ptr, ImagePtr imagePtr) {
+ NSImage *theImage = (NSImage *)imagePtr;
+ NSButton *control = (NSButton *)ptr;
+ [control setImage:theImage];
+}

image.h

@@ -0,0 +1,4 @@
+#import <Cocoa/Cocoa.h>
+
+typedef void *ImagePtr;
+ImagePtr Image_NewWithRGBA(int w, int h, unsigned char *rgba);

image.m

@@ -0,0 +1,24 @@
+#import "image.h"
+#include "_cgo_export.h"
+
+ImagePtr Image_NewWithRGBA(int w, int h, unsigned char *rgba) {
+ NSBitmapImageRep *bitmap = [[NSBitmapImageRep alloc]
+ initWithBitmapDataPlanes:NULL
+ pixelsWide:w
+ pixelsHigh:h
+ bitsPerSample:8
+ samplesPerPixel:4
+ hasAlpha:YES
+ isPlanar:NO
+ colorSpaceName:NSCalibratedRGBColorSpace
+ bytesPerRow:w * 4
+ bitsPerPixel:32];
+
+ unsigned char *bitmapData = [bitmap bitmapData];
+ memcpy(bitmapData, rgba, w * h * 4);
+
+ NSImage *theImage = [[NSImage alloc] init];
+ [theImage addRepresentation:bitmap];
+
+ return (ImagePtr)theImage;
+}