macOS: use native screen menu bar if system property apple.laf.useScreenMenuBar is true

CHANGELOG.md

@@ -1,6 +1,12 @@
 FlatLaf Change Log
 ==================
 
+## Unreleased
+
+- macOS: Use native screen menu bar if system property
+  `apple.laf.useScreenMenuBar` is `true`.
+
+
 ## 0.11
 
 - Changed Maven groupId to `com.formdev` and artifactId to `flatlaf`.

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatLaf.java

@@ -157,9 +157,17 @@ public abstract class FlatLaf
 		defaults.put( "Spinner.disabledBackground", control );
 		defaults.put( "Spinner.disabledForeground", control );
 
+		// remember MenuBarUI from Mac Aqua LaF if Mac screen menubar is enabled
+		boolean useScreenMenuBar = SystemInfo.IS_MAC && "true".equals( System.getProperty( "apple.laf.useScreenMenuBar" ) );
+		Object aquaMenuBarUI = useScreenMenuBar ? defaults.get( "MenuBarUI" ) : null;
+
 		initFonts( defaults );
 		loadDefaultsFromProperties( defaults );
 
+		// use Aqua MenuBarUI if Mac screen menubar is enabled
+		if( useScreenMenuBar )
+			defaults.put( "MenuBarUI", aquaMenuBarUI );
+
 		return defaults;
 	}