src/java.desktop/windows/classes/sun/awt/Win32GraphicsEnvironment.java

@@ -24,16 +24,19 @@
  */
 
 package sun.awt;
 
 import java.awt.AWTError;
+import java.awt.EventQueue;
 import java.awt.GraphicsConfiguration;
 import java.awt.GraphicsDevice;
 import java.awt.peer.ComponentPeer;
 import java.lang.ref.WeakReference;
 import java.util.ArrayList;
+import java.util.HashSet;
 import java.util.ListIterator;
+import java.util.Set;
 
 import sun.awt.windows.WToolkit;
 import sun.java2d.SunGraphicsEnvironment;
 import sun.java2d.SurfaceManagerFactory;
 import sun.java2d.WindowsSurfaceManagerFactory;

@@ -252,21 +255,34 @@
      */
     public static boolean isDWMCompositionEnabled() {
         return isDWMCompositionEnabled;
     }
 
+    private static final Set<Runnable> dwmCompositionChangeListeners = new HashSet<>();
+
+    public static void addDwmCompositionChangeListener(Runnable listener) {
+        dwmCompositionChangeListeners.add(listener);
+    }
+
+    public static void removeDwmCompositionChangeListener(Runnable listener) {
+        dwmCompositionChangeListeners.remove(listener);
+    }
+
     /**
-     * Called from the native code when DWM composition state changed.
-     * May be called multiple times during the lifetime of the application.
-     * REMIND: we may want to create a listener mechanism for this.
+     * Called from the native code when DWM composition state changed. May be
+     * called multiple times during the lifetime of the application.
      *
      * Note: called on the Toolkit thread, no user code or locks are allowed.
      *
      * @param enabled indicates the state of dwm composition
      */
     private static void dwmCompositionChanged(boolean enabled) {
         isDWMCompositionEnabled = enabled;
+        if (dwmCompositionChangeListeners != null) {
+            EventQueue.invokeLater(()
+                    -> dwmCompositionChangeListeners.forEach(Runnable::run));
+        }
     }
 
     /**
      * Used to find out if the OS is Windows Vista or later.
      *