Merge pull request #65 from jefvel/menu-item-icons

Made it possible to add icons to menu items on Mac

README.md

@@ -13,6 +13,9 @@ func onReady() {
 	systray.SetTitle("Awesome App")
 	systray.SetTooltip("Pretty awesome超级棒")
 	mQuit := systray.AddMenuItem("Quit", "Quit the whole app")
+
+	// Sets the icon of a menu item. Only available on Mac.
+	mQuit.SetIcon(icon.Data)
 }
 
 func onExit() {

example/main.go

@@ -44,6 +44,10 @@ func onReady() {
 		systray.AddMenuItem("Ignored", "Ignored")
 		mUrl := systray.AddMenuItem("Open Lantern.org", "my home")
 		mQuit := systray.AddMenuItem("退出", "Quit the whole app")
+
+		// Sets the icon of a menu item. Only available on Mac.
+		mQuit.SetIcon(icon.Data)
+
 		systray.AddSeparator()
 		mToggle := systray.AddMenuItem("Toggle", "Toggle the Quit button")
 		shown := true

systray.h

@@ -4,6 +4,7 @@ extern void systray_menu_item_selected(int menu_id);
 int nativeLoop(void);
 
 void setIcon(const char* iconBytes, int length);
+void setMenuItemIcon(const char* iconBytes, int length, int menuId);
 void setTitle(char* title);
 void setTooltip(char* tooltip);
 void add_or_update_menu_item(int menuId, char* title, char* tooltip, short disabled, short checked);

systray_darwin.m

@@ -124,6 +124,19 @@
   [menuItem setHidden:TRUE];
 }
 
+- (void)setMenuItemIcon:(NSArray*)imageAndMenuId {
+  NSImage* image = [imageAndMenuId objectAtIndex:0];
+  NSNumber* menuId = [imageAndMenuId objectAtIndex:1];
+
+  NSMenuItem* menuItem;
+  int existedMenuIndex = [menu indexOfItemWithRepresentedObject: menuId];
+  if (existedMenuIndex == -1) {
+    return;
+  }
+  menuItem = [menu itemAtIndex: existedMenuIndex];
+  menuItem.image = image;
+}
+
 - (void) show_menu_item:(NSNumber*) menuId
 {
   NSMenuItem* menuItem;
@@ -163,6 +176,15 @@ void setIcon(const char* iconBytes, int length) {
   runInMainThread(@selector(setIcon:), (id)image);
 }
 
+void setMenuItemIcon(const char* iconBytes, int length, int menuId) {
+  NSData* buffer = [NSData dataWithBytes: iconBytes length:length];
+  NSImage *image = [[NSImage alloc] initWithData:buffer];
+  [image setSize:NSMakeSize(16, 16)];
+
+  NSNumber *mId = [NSNumber numberWithInt:menuId];
+  runInMainThread(@selector(setMenuItemIcon:), @[image, (id)mId]);
+}
+
 void setTitle(char* ctitle) {
   NSString* title = [[NSString alloc] initWithCString:ctitle
                                              encoding:NSUTF8StringEncoding];

systray_linux.c

@@ -177,6 +177,9 @@ void setTooltip(char* ctooltip) {
 	free(ctooltip);
 }
 
+void setMenuItemIcon(const char* iconBytes, int length, int menuId) {
+}
+
 void add_or_update_menu_item(int menu_id, char* title, char* tooltip, short disabled, short checked) {
 	MenuItemInfo *mii = malloc(sizeof(MenuItemInfo));
 	mii->menu_id = menu_id;

systray_nonwindows.go

@@ -60,6 +60,13 @@ func addOrUpdateMenuItem(item *MenuItem) {
 	)
 }
 
+// SetIcon sets the icon of a menu item. Only available on Mac.
+// iconBytes should be the content of .ico/.jpg/.png
+func (item *MenuItem) SetIcon(iconBytes []byte) {
+	cstr := (*C.char)(unsafe.Pointer(&iconBytes[0]))
+	C.setMenuItemIcon(cstr, (C.int)(len(iconBytes)), C.int(item.id))
+}
+
 func addSeparator(id int32) {
 	C.add_separator(C.int(id))
 }

systray_windows.go

@@ -647,6 +647,11 @@ func SetTitle(title string) {
 	// do nothing
 }
 
+// SetIcon sets the icon of a menu item. Only available on Mac.
+func (item *MenuItem) SetIcon(iconBytes []byte) {
+	// do nothing
+}
+
 // SetTooltip sets the systray tooltip to display on mouse hover of the tray icon,
 // only available on Mac and Windows.
 func SetTooltip(tooltip string) {