Detect dank mode on Mac OS

src/slic3r/CMakeLists.txt

@@ -149,7 +149,10 @@ set(SLIC3R_GUI_SOURCES
 )
 
 if (APPLE)
-    list(APPEND SLIC3R_GUI_SOURCES Utils/RetinaHelperImpl.mm)
+    list(APPEND SLIC3R_GUI_SOURCES
+            Utils/RetinaHelperImpl.mm
+            Utils/MacDarkMode.mm
+        )
 endif ()
 
 add_library(libslic3r_gui STATIC ${SLIC3R_GUI_SOURCES})

src/slic3r/GUI/GUI_App.cpp

@@ -34,6 +34,7 @@
 
 #include "../Utils/PresetUpdater.hpp"
 #include "../Utils/PrintHost.hpp"
+#include "../Utils/MacDarkMode.hpp"
 #include "ConfigWizard.hpp"
 #include "slic3r/Config/Snapshot.hpp"
 #include "ConfigSnapshotDialog.hpp"
@@ -284,10 +285,24 @@ unsigned GUI_App::get_colour_approx_luma(const wxColour &colour)
         ));
 }
 
+bool GUI_App::dark_mode()
+{
+    const unsigned luma = get_colour_approx_luma(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
+    return luma < 128;
+}
+
+bool GUI_App::dark_mode_menus()
+{
+#if __APPLE__
+    return mac_dark_mode();
+#else
+    return dark_mode();
+#endif
+}
+
 void GUI_App::init_label_colours()
 {
-    auto luma = get_colour_approx_luma(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
-    if (luma >= 128) {
+    if (dark_mode()) {
         m_color_label_modified = wxColour(252, 77, 1);
         m_color_label_sys = wxColour(26, 132, 57);
     }

src/slic3r/GUI/GUI_App.hpp

@@ -94,7 +94,9 @@ public:
 
     GUI_App();
 
-    unsigned        get_colour_approx_luma(const wxColour &colour);
+    static unsigned get_colour_approx_luma(const wxColour &colour);
+    static bool     dark_mode();
+    static bool     dark_mode_menus();
     void            init_label_colours();
     void            update_label_colours_from_appconfig();
     void            init_fonts();

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