src/macosx/classes/sun/lwawt/macosx/CPlatformEmbeddedFrame.java

@@ -31,29 +31,36 @@
 import sun.java2d.opengl.CGLLayer;
 import sun.java2d.SurfaceData;
 
 import sun.awt.CGraphicsConfig;
 import sun.awt.CGraphicsDevice;
+import sun.awt.CausedFocusEvent;
 
 import java.awt.*;
 import java.awt.BufferCapabilities.FlipContents;
 
+import sun.util.logging.PlatformLogger;
+
 /*
  * Provides a lightweight implementation of the EmbeddedFrame.
  */
 public class CPlatformEmbeddedFrame implements PlatformWindow {
 
+    private static final PlatformLogger focusLogger = PlatformLogger.getLogger("sun.lwawt.macosx.focus.CPlatformEmbeddedFrame");
+
     private CGLLayer windowLayer;
     private LWWindowPeer peer;
+    private CEmbeddedFrame target;
 
     private volatile int screenX = 0;
     private volatile int screenY = 0;
 
     @Override // PlatformWindow
     public void initialize(Window target, final LWWindowPeer peer, PlatformWindow owner) {
         this.peer = peer;
         this.windowLayer = new CGLLayer(peer);
+        this.target = (CEmbeddedFrame)target;
     }
 
     @Override
     public LWWindowPeer getPeer() {
         return peer;

@@ -147,10 +154,22 @@
 
     @Override
     public void updateFocusableWindowState() {}
 
     @Override
+    public boolean rejectFocusRequest(CausedFocusEvent.Cause cause) {
+        // Cross-app activation requests are not allowed.
+        if (cause != CausedFocusEvent.Cause.MOUSE_EVENT &&
+            !target.isParentWindowActive())
+        {
+            focusLogger.fine("the embedder is inactive, so the request is rejected");
+            return true;
+        }
+        return false;
+    }
+
+    @Override
     public boolean requestWindowFocus() {
         return true;
     }
 
     @Override