Detect dank mode on Mac OS

src/slic3r/Utils/MacDarkMode.hpp

@@ -0,0 +1,15 @@
+#ifndef slic3r_MacDarkMode_hpp_
+#define slic3r_MacDarkMode_hpp_
+
+namespace Slic3r {
+namespace GUI {
+
+#if __APPLE__
+extern bool mac_dark_mode();
+#endif
+
+
+} // namespace GUI
+} // namespace Slic3r
+
+#endif // MacDarkMode_h

src/slic3r/Utils/MacDarkMode.mm

@@ -0,0 +1,22 @@
+#import "MacDarkMode.hpp"
+
+#import <Foundation/Foundation.h>
+
+
+@implementation MacDarkMode
+
+namespace Slic3r {
+namespace GUI {
+
+bool mac_dark_mode()
+{
+    NSString *style = [[NSUserDefaults standardUserDefaults] stringForKey:@"AppleInterfaceStyle"];
+    return style && [style isEqualToString:@"Dark"];
+
+}
+
+
+}
+}
+
+@end