Merge branch 'Bug1178' of https://github.com/xranby/jogl

7 files changed, 506 insertions, 15 deletions

diff --git a/src/newt/classes/jogamp/newt/WindowImpl.java b/src/newt/classes/jogamp/newt/WindowImpl.java
index 8e31d1d21..091e6243a 100644
--- a/src/newt/classes/jogamp/newt/WindowImpl.java
+++ b/src/newt/classes/jogamp/newt/WindowImpl.java
@@ -2997,8 +2997,8 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer
         final MouseEvent e;
         switch( eventType ) {
             case MouseEvent.EVENT_MOUSE_CLICKED:
-                e = null;
-                break;
+                // swallow CLICK event
+                return;
 
             case MouseEvent.EVENT_MOUSE_PRESSED:
                 if( 0 >= pPressure[0] ) {
@@ -3062,6 +3062,7 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer
                 e = new MouseEvent(eventType, this, when, modifiers, pTypes, pID,
                                    pX, pY, pPressure, maxPressure, button, (short)0, rotationXYZ, rotationScale);
         }
+
         doEvent(enqueue, wait, e); // actual mouse event
     }
 
diff --git a/src/newt/classes/jogamp/newt/driver/KeyTracker.java b/src/newt/classes/jogamp/newt/driver/KeyTracker.java
new file mode 100644
index 000000000..ab91d48aa
--- /dev/null
+++ b/src/newt/classes/jogamp/newt/driver/KeyTracker.java
@@ -0,0 +1,35 @@
+/**
+ * Copyright 2015 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+
+package jogamp.newt.driver;
+
+import com.jogamp.newt.event.WindowListener;
+
+public interface KeyTracker extends WindowListener{
+
+}
diff --git a/src/newt/classes/jogamp/newt/driver/MouseTracker.java b/src/newt/classes/jogamp/newt/driver/MouseTracker.java
new file mode 100644
index 000000000..3a0cb2db4
--- /dev/null
+++ b/src/newt/classes/jogamp/newt/driver/MouseTracker.java
@@ -0,0 +1,39 @@
+/**
+ * Copyright 2015 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+
+package jogamp.newt.driver;
+
+import com.jogamp.newt.event.WindowListener;
+
+public interface MouseTracker extends WindowListener {
+
+	int getLastY();
+
+	int getLastX();
+
+}
diff --git a/src/newt/classes/jogamp/newt/driver/bcm/vc/iv/WindowDriver.java b/src/newt/classes/jogamp/newt/driver/bcm/vc/iv/WindowDriver.java
index 93c28d370..c971acfad 100644
--- a/src/newt/classes/jogamp/newt/driver/bcm/vc/iv/WindowDriver.java
+++ b/src/newt/classes/jogamp/newt/driver/bcm/vc/iv/WindowDriver.java
@@ -34,6 +34,7 @@ import com.jogamp.nativewindow.Capabilities;
 import com.jogamp.nativewindow.DefaultGraphicsScreen;
 import com.jogamp.nativewindow.GraphicsConfigurationFactory;
 import com.jogamp.nativewindow.NativeWindowException;
+
 import com.jogamp.nativewindow.VisualIDHolder;
 import com.jogamp.nativewindow.util.Insets;
 import com.jogamp.nativewindow.util.Point;
@@ -41,12 +42,16 @@ import com.jogamp.nativewindow.util.Rectangle;
 import com.jogamp.nativewindow.util.RectangleImmutable;
 import com.jogamp.common.util.IntBitfield;
 import com.jogamp.nativewindow.egl.EGLGraphicsDevice;
+
 import com.jogamp.newt.event.MouseEvent;
 
 import jogamp.newt.PointerIconImpl;
 import jogamp.newt.WindowImpl;
+import jogamp.newt.driver.KeyTracker;
+import jogamp.newt.driver.MouseTracker;
 import jogamp.newt.driver.linux.LinuxEventDeviceTracker;
 import jogamp.newt.driver.linux.LinuxMouseTracker;
+import jogamp.newt.driver.x11.X11UnderlayTracker;
 import jogamp.opengl.egl.EGLDisplayUtil;
 
 public class WindowDriver extends WindowImpl {
@@ -57,8 +62,25 @@ public class WindowDriver extends WindowImpl {
     }
 
     public WindowDriver() {
-        linuxMouseTracker = LinuxMouseTracker.getSingleton();
-        linuxEventDeviceTracker = LinuxEventDeviceTracker.getSingleton();
+        
+        /* Try use X11 as input for bcm.vc.iv
+         * if X11 fail to initialize then
+         * track using the /dev/event files directly
+         * using the LinuxMouseTracker
+         */
+        try{
+            x11UnderlayTracker = X11UnderlayTracker.getSingleton();
+
+            mouseTracker = x11UnderlayTracker;
+            keyTracker = x11UnderlayTracker;
+        } catch(ExceptionInInitializerError e) {
+            linuxMouseTracker = LinuxMouseTracker.getSingleton();
+            linuxEventDeviceTracker = LinuxEventDeviceTracker.getSingleton();
+
+            mouseTracker = linuxMouseTracker;
+            keyTracker = linuxEventDeviceTracker;
+        }
+
         layer = -1;
         nativeWindowHandle = 0;
         windowHandleClose = 0;
@@ -192,8 +214,10 @@ public class WindowDriver extends WindowImpl {
         }
         windowHandleClose = nativeWindowHandle;
 
-        addWindowListener(linuxEventDeviceTracker);
-        addWindowListener(linuxMouseTracker);
+        addWindowListener(keyTracker);
+        addWindowListener(mouseTracker);
+
+        
         focusChanged(false, true);
     }
 
@@ -202,8 +226,8 @@ public class WindowDriver extends WindowImpl {
         final DisplayDriver display = (DisplayDriver) getScreen().getDisplay();
         final EGLGraphicsDevice eglDevice = (EGLGraphicsDevice) getGraphicsConfiguration().getScreen().getDevice();
 
-        removeWindowListener(linuxMouseTracker);
-        removeWindowListener(linuxEventDeviceTracker);
+        removeWindowListener(mouseTracker);
+        removeWindowListener(keyTracker);
 
         if(0!=windowHandleClose) {
             CloseWindow0(display.getBCMHandle(), windowHandleClose);
@@ -229,6 +253,7 @@ public class WindowDriver extends WindowImpl {
         final RectangleImmutable rect = clampRect((ScreenDriver) getScreen(), new Rectangle(x, y, width, height), false);
         // reconfigure0 will issue position/size changed events if required
         reconfigure0(nativeWindowHandle, rect.getX(), rect.getY(), rect.getWidth(), rect.getHeight(), flags);
+        
         return true;
     }
 
@@ -245,7 +270,7 @@ public class WindowDriver extends WindowImpl {
     @Override
     protected final void doMouseEvent(final boolean enqueue, final boolean wait, final short eventType, final int modifiers,
                                       final int x, final int y, final short button, final float[] rotationXYZ, final float rotationScale) {
-        if( MouseEvent.EVENT_MOUSE_MOVED == eventType ) {
+        if( MouseEvent.EVENT_MOUSE_MOVED == eventType || MouseEvent.EVENT_MOUSE_DRAGGED == eventType ) {
             final DisplayDriver display = (DisplayDriver) getScreen().getDisplay();
             display.moveActivePointerIcon(getX() + x, getY() + y);
         }
@@ -255,21 +280,25 @@ public class WindowDriver extends WindowImpl {
     @Override
     protected void setPointerIconImpl(final PointerIconImpl pi) {
         final DisplayDriver display = (DisplayDriver) getScreen().getDisplay();
-        display.setPointerIconActive(null != pi ? pi.validatedHandle() : 0, linuxMouseTracker.getLastX(), linuxMouseTracker.getLastY());
+        display.setPointerIconActive(null != pi ? pi.validatedHandle() : 0, mouseTracker.getLastX(), mouseTracker.getLastY());
     }
 
     @Override
     protected boolean setPointerVisibleImpl(final boolean pointerVisible) {
         final DisplayDriver display = (DisplayDriver) getScreen().getDisplay();
-        display.setActivePointerIconVisible(pointerVisible, linuxMouseTracker.getLastX(), linuxMouseTracker.getLastY());
+        display.setActivePointerIconVisible(pointerVisible, mouseTracker.getLastX(), mouseTracker.getLastY());
         return true;
     }
 
     //----------------------------------------------------------------------
     // Internals only
     //
-    private final LinuxMouseTracker linuxMouseTracker;
-    private final LinuxEventDeviceTracker linuxEventDeviceTracker;
+    private LinuxMouseTracker linuxMouseTracker;
+    private LinuxEventDeviceTracker linuxEventDeviceTracker;
+    private X11UnderlayTracker x11UnderlayTracker;
+    
+    private MouseTracker mouseTracker;
+    private KeyTracker keyTracker;
 
     protected static native boolean initIDs();
     private        native long CreateWindow0(long bcmDisplay, int layer, int x, int y, int width, int height, boolean opaque, int alphaBits);
diff --git a/src/newt/classes/jogamp/newt/driver/linux/LinuxEventDeviceTracker.java b/src/newt/classes/jogamp/newt/driver/linux/LinuxEventDeviceTracker.java
index 49a815cb6..bc0bfaa16 100644
--- a/src/newt/classes/jogamp/newt/driver/linux/LinuxEventDeviceTracker.java
+++ b/src/newt/classes/jogamp/newt/driver/linux/LinuxEventDeviceTracker.java
@@ -40,6 +40,7 @@ import java.lang.Thread;
 import java.nio.ByteBuffer;
 
 import jogamp.newt.WindowImpl;
+import jogamp.newt.driver.KeyTracker;
 
 import com.jogamp.common.nio.StructAccessor;
 import com.jogamp.newt.Window;
@@ -55,7 +56,7 @@ import com.jogamp.newt.event.KeyEvent;
  * within it's own polling thread.
  */
 
-public class LinuxEventDeviceTracker implements WindowListener {
+public class LinuxEventDeviceTracker implements WindowListener, KeyTracker {
 
     private static final LinuxEventDeviceTracker ledt;
 
diff --git a/src/newt/classes/jogamp/newt/driver/linux/LinuxMouseTracker.java b/src/newt/classes/jogamp/newt/driver/linux/LinuxMouseTracker.java
index 1d9377563..f40728da0 100644
--- a/src/newt/classes/jogamp/newt/driver/linux/LinuxMouseTracker.java
+++ b/src/newt/classes/jogamp/newt/driver/linux/LinuxMouseTracker.java
@@ -35,6 +35,7 @@ import java.io.IOException;
 import java.io.InputStream;
 
 import jogamp.newt.WindowImpl;
+import jogamp.newt.driver.MouseTracker;
 
 import com.jogamp.newt.Screen;
 import com.jogamp.newt.Window;
@@ -48,7 +49,7 @@ import com.jogamp.newt.event.WindowUpdateEvent;
  * just reading <code>/dev/input/mice</code>
  * within it's own polling thread.
  */
-public class LinuxMouseTracker implements WindowListener {
+public class LinuxMouseTracker implements WindowListener, MouseTracker {
 
     private static final LinuxMouseTracker lmt;
 
diff --git a/src/newt/classes/jogamp/newt/driver/x11/X11UnderlayTracker.java b/src/newt/classes/jogamp/newt/driver/x11/X11UnderlayTracker.java
new file mode 100644
index 000000000..523899abe
--- /dev/null
+++ b/src/newt/classes/jogamp/newt/driver/x11/X11UnderlayTracker.java
@@ -0,0 +1,385 @@
+/**
+ * Copyright 2015 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+
+package jogamp.newt.driver.x11;
+
+import jogamp.nativewindow.x11.X11Util;
+import jogamp.newt.WindowImpl;
+import jogamp.newt.driver.MouseTracker;
+import jogamp.newt.driver.KeyTracker;
+
+import com.jogamp.common.util.ArrayHashMap;
+import com.jogamp.common.util.ReflectionUtil;
+import com.jogamp.nativewindow.Capabilities;
+import com.jogamp.nativewindow.GraphicsConfigurationFactory;
+import com.jogamp.nativewindow.NativeWindowFactory;
+import com.jogamp.newt.Display;
+import com.jogamp.newt.NewtFactory;
+import com.jogamp.newt.Screen;
+import com.jogamp.newt.Window;
+import com.jogamp.newt.event.KeyEvent;
+import com.jogamp.newt.event.KeyListener;
+import com.jogamp.newt.event.MouseEvent;
+import com.jogamp.newt.event.MouseListener;
+import com.jogamp.newt.event.WindowEvent;
+import com.jogamp.newt.event.WindowListener;
+import com.jogamp.newt.event.WindowUpdateEvent;
+
+/**
+ * UnderlayTracker can be used as input for WM that only provide undecorated
+ * overlays.
+ * 
+ * The UnderlayTracker enable move and resize manipulation of the overlays.
+ * 
+ * A NEWT window may use the UnderlayTracker by calling
+ * <code>addWindowListener(X11UnderlayTracker.getSingleton())</code>
+ */
+public class X11UnderlayTracker implements WindowListener, KeyListener, MouseListener,
+                                           MouseTracker, KeyTracker {
+
+    private static final X11UnderlayTracker tracker;
+    private volatile WindowImpl focusedWindow = null; // Key events is sent to the focusedWindow
+    private volatile MouseEvent lastMouse;
+    private volatile static ArrayHashMap<WindowImpl, WindowImpl> underlayWindowMap = new ArrayHashMap<WindowImpl, WindowImpl>(false, ArrayHashMap.DEFAULT_INITIAL_CAPACITY, ArrayHashMap.DEFAULT_LOAD_FACTOR);
+    private volatile static ArrayHashMap<WindowImpl, WindowImpl> overlayWindowMap = new ArrayHashMap<WindowImpl, WindowImpl>(false, ArrayHashMap.DEFAULT_INITIAL_CAPACITY, ArrayHashMap.DEFAULT_LOAD_FACTOR);
+
+    static {
+        /*
+         * X11UnderlayTracker is intended to be used on systems where X11 is not
+         * the default WM. We must explicitly initialize all X11 dependencies to
+         * make sure they are available.
+         */
+        X11Util.initSingleton();
+        GraphicsConfigurationFactory.initSingleton();
+        try {
+            ReflectionUtil.callStaticMethod(
+                    "jogamp.nativewindow.x11.X11GraphicsConfigurationFactory",
+                    "registerFactory", null, null,
+                    GraphicsConfigurationFactory.class.getClassLoader());
+        } catch (final Exception e) {
+            throw new RuntimeException(e);
+        }
+        tracker = new X11UnderlayTracker();
+    }
+
+    public static X11UnderlayTracker getSingleton() {
+        return tracker;
+    }
+
+    @Override
+    public void windowResized(final WindowEvent e) {
+        final Object s = e.getSource();
+        if (underlayWindowMap.containsKey(s)) {
+            WindowImpl underlayWindow = (WindowImpl)s;
+            WindowImpl overlayWindow = underlayWindowMap.get(s);
+            if(overlayWindow.getSurfaceWidth() != underlayWindow.getSurfaceWidth() ||
+               overlayWindow.getSurfaceHeight() != underlayWindow.getSurfaceHeight()) {
+               overlayWindow.setSize(underlayWindow.getSurfaceWidth(),
+                                     underlayWindow.getSurfaceHeight());
+            }
+        } else if (overlayWindowMap.containsKey(s)){
+            WindowImpl overlayWindow = (WindowImpl)s;
+            WindowImpl underlayWindow = overlayWindowMap.get(s);
+            if(overlayWindow.getSurfaceWidth() != underlayWindow.getSurfaceWidth() ||
+               overlayWindow.getSurfaceHeight() != underlayWindow.getSurfaceHeight()) {
+                underlayWindow.setSize(overlayWindow.getSurfaceWidth(),
+                                       overlayWindow.getSurfaceHeight());
+            }
+        }
+    }
+
+    @Override
+    public void windowMoved(final WindowEvent e) {
+        final Object s = e.getSource();
+        if (underlayWindowMap.containsKey(s)) {
+            WindowImpl underlayWindow = (WindowImpl)s;
+            WindowImpl overlayWindow = underlayWindowMap.get(s);
+            if(overlayWindow.getX()!=underlayWindow.getX() ||
+               overlayWindow.getY()!=underlayWindow.getY()) {
+                overlayWindow.setPosition(underlayWindow.getX(), underlayWindow.getY());
+            }
+        } else if (overlayWindowMap.containsKey(s)) {
+            WindowImpl overlayWindow = (WindowImpl)s;
+            WindowImpl underlayWindow = overlayWindowMap.get(s);
+            if(overlayWindow.getX()!=underlayWindow.getX() ||
+               overlayWindow.getY()!=underlayWindow.getY()) {
+                //FIXME: Pressing Maximize on the underlay X11
+                //with this line enabled locks-up the NEWT EDT while using the BCM.VC.IV
+                //underlayWindow.setPosition(overlayWindow.getX(), overlayWindow.getY());
+            }
+        }
+    }
+
+    @Override
+    public void windowDestroyNotify(final WindowEvent e) {
+        final Object s = e.getSource();
+        if (underlayWindowMap.containsKey(s)) {
+            WindowImpl underlayWindow = (WindowImpl)s;
+            WindowImpl overlayWindow = underlayWindowMap.get(s);
+            overlayWindowMap.remove(overlayWindow);
+            underlayWindowMap.remove(underlayWindow);
+            if (focusedWindow == overlayWindow) {
+                focusedWindow = null;
+            }
+            overlayWindow.destroy();
+        } else if (overlayWindowMap.containsKey(s)) {
+            WindowImpl overlayWindow = (WindowImpl)s;
+            WindowImpl underlayWindow = overlayWindowMap.get(s);
+            overlayWindowMap.remove(overlayWindow);
+            underlayWindowMap.remove(underlayWindow);
+            if (focusedWindow == overlayWindow) {
+                focusedWindow = null;
+            }
+            underlayWindow.destroy();
+        }
+    }
+
+    @Override
+    public void windowDestroyed(final WindowEvent e) {
+    }
+
+    @Override
+    public void windowGainedFocus(final WindowEvent e) {
+        final Object s = e.getSource();
+        if (s instanceof WindowImpl) {
+            if (underlayWindowMap.containsKey(s)) {
+                WindowImpl overlayWindow = underlayWindowMap.get(s);
+                focusedWindow = overlayWindow;
+            } else if (overlayWindowMap.containsKey(s)) {
+                focusedWindow = (WindowImpl) s;
+            } else {
+                /*
+                 * Initialize the X11 under-lay tracker window.
+                 * when a new overlay gain focus.
+                 */
+                WindowImpl overlayWindow = (WindowImpl) s;
+                Capabilities caps = new Capabilities();
+
+                /* 1178 cc6: if you render the overlay window transparent -> caps.setBackgroundOpaque(false);
+                 *      then you will see that the under-lay tracker window newer repaints -> looks a bit like a mess.
+                 * Attempted fix 1178 cc6: x11 under-lay tracker window can be set transparent as well.
+                 * FIXME: The under-lay tracker window is still filled with opaque garbage.
+                 */
+                caps.setBackgroundOpaque(false);
+
+                final Display display = NewtFactory.createDisplay(NativeWindowFactory.TYPE_X11, null, false);
+                final Screen screen = NewtFactory.createScreen(display, 0);
+                WindowImpl underlayWindow = WindowImpl.create(null, 0, screen, caps);
+
+                /*
+                 * Register overlay and under-lay window in the map's before generating events.
+                 */
+                underlayWindowMap.put(underlayWindow, overlayWindow);
+                overlayWindowMap.put(overlayWindow, underlayWindow);
+
+                /* 1178 cc4: another window overlaps NEWT under-lay window -> overlay window is still on top.
+                 * Fix 1178 cc4: we can request the NEWT under-lay window to use always on top.
+                 */
+                underlayWindow.setAlwaysOnTop(true);
+
+                underlayWindow.setTitle(overlayWindow.getTitle());
+
+                if(overlayWindow.isUndecorated()){
+                    underlayWindow.setUndecorated(true);
+                }
+
+                underlayWindow.addKeyListener(this);
+                underlayWindow.addMouseListener(this);
+                underlayWindow.addWindowListener(this);
+
+                underlayWindow.setSize(overlayWindow.getSurfaceWidth(),
+                                       overlayWindow.getSurfaceHeight());
+                underlayWindow.setPosition(overlayWindow.getX(), overlayWindow.getY());
+
+                underlayWindow.setVisible(false, true);
+
+                focusedWindow = (WindowImpl) s;
+            }
+        }
+    }
+
+    @Override
+    public void windowLostFocus(final WindowEvent e) {
+        final Object s = e.getSource();
+        if (underlayWindowMap.containsKey(s)) {
+            WindowImpl overlayWindow = underlayWindowMap.get(s);
+            if (focusedWindow == overlayWindow) {
+                focusedWindow = null;
+            }
+        } else {
+            if (focusedWindow == s) {
+                focusedWindow = null;
+            }
+        }
+    }
+
+    @Override
+    public void windowRepaint(final WindowUpdateEvent e) {
+    }
+
+    public static void main(String[] args) throws InterruptedException {
+        Capabilities caps = new Capabilities();
+        caps.setBackgroundOpaque(false);
+
+        Window w = NewtFactory.createWindow(caps);
+        w.setUndecorated(true);
+        w.addWindowListener(X11UnderlayTracker.getSingleton());
+        w.setTitle("1");
+        w.setVisible(true);
+
+        w = NewtFactory.createWindow(caps);
+        w.setUndecorated(false);
+        w.addWindowListener(X11UnderlayTracker.getSingleton());
+        w.setTitle("2");
+        w.setVisible(true);
+
+        Thread.sleep(25000);
+    }
+
+    @Override
+    public void mouseClicked(MouseEvent e) {
+        lastMouse = e;
+        final Object s = e.getSource();
+        if (underlayWindowMap.containsKey(s)) {
+            WindowImpl overlayWindow = underlayWindowMap.get(s);
+            overlayWindow.sendMouseEvent(MouseEvent.EVENT_MOUSE_CLICKED, 0,
+                                         e.getX(), e.getY(), (short) 0, 0);
+        }
+    }
+
+    @Override
+    public void mouseEntered(MouseEvent e) {
+        lastMouse = e;
+        final Object s = e.getSource();
+        if (underlayWindowMap.containsKey(s)) {
+            WindowImpl overlayWindow = underlayWindowMap.get(s);
+            overlayWindow.sendMouseEvent(MouseEvent.EVENT_MOUSE_ENTERED, 0,
+                                         e.getX(), e.getY(), (short) 0, 0);
+        }
+    }
+
+    @Override
+    public void mouseExited(MouseEvent e) {
+        lastMouse = e;
+        final Object s = e.getSource();
+        if (underlayWindowMap.containsKey(s)) {
+            WindowImpl overlayWindow = underlayWindowMap.get(s);
+            overlayWindow.sendMouseEvent(MouseEvent.EVENT_MOUSE_EXITED, 0,
+                                         e.getX(), e.getY(), (short) 0, 0);
+        }
+    }
+
+    @Override
+    public void mousePressed(MouseEvent e) {
+        lastMouse = e;
+        final Object s = e.getSource();
+        if (underlayWindowMap.containsKey(s)) {
+            WindowImpl overlayWindow = underlayWindowMap.get(s);
+            overlayWindow.sendMouseEvent(MouseEvent.EVENT_MOUSE_PRESSED, 0,
+                                         e.getX(), e.getY(), (short) 0, 0);
+        }
+    }
+
+    @Override
+    public void mouseReleased(MouseEvent e) {
+        lastMouse = e;
+        final Object s = e.getSource();
+        if (underlayWindowMap.containsKey(s)) {
+            WindowImpl overlayWindow = underlayWindowMap.get(s);
+            overlayWindow.sendMouseEvent(MouseEvent.EVENT_MOUSE_RELEASED, 0,
+                                         e.getX(), e.getY(), (short) 0, 0);
+        }
+    }
+
+    @Override
+    public void mouseMoved(MouseEvent e) {
+        lastMouse = e;
+        final Object s = e.getSource();
+        if (underlayWindowMap.containsKey(s)) {
+            WindowImpl overlayWindow = underlayWindowMap.get(s);
+            overlayWindow.sendMouseEvent(MouseEvent.EVENT_MOUSE_MOVED, 0,
+                                         e.getX(), e.getY(), (short) 0, 0);
+        }
+    }
+
+    @Override
+    public void mouseDragged(MouseEvent e) {
+        lastMouse = e;
+        final Object s = e.getSource();
+        if (underlayWindowMap.containsKey(s)) {
+            WindowImpl overlayWindow = underlayWindowMap.get(s);
+            overlayWindow.sendMouseEvent(MouseEvent.EVENT_MOUSE_DRAGGED, 0,
+                                         e.getX(), e.getY(), (short) 0, 0);
+        }
+    }
+
+    @Override
+    public void mouseWheelMoved(MouseEvent e) {
+        lastMouse = e;
+        final Object s = e.getSource();
+        if (underlayWindowMap.containsKey(s)) {
+            WindowImpl overlayWindow = underlayWindowMap.get(s);
+            overlayWindow.sendMouseEvent(MouseEvent.EVENT_MOUSE_WHEEL_MOVED, 0,
+                                         e.getX(), e.getY(), (short) 0, 0);
+        }
+    }
+
+    @Override
+    public void keyPressed(KeyEvent e) {
+        if (focusedWindow != null) {
+            // e.setConsumed(false);
+            // focusedWindow.consumeEvent(e);
+            focusedWindow.sendKeyEvent(e.getEventType(), e.getModifiers(),
+                                       e.getKeyCode(), e.getKeyCode(), (char) e.getKeySymbol());
+        }
+    }
+
+    @Override
+    public void keyReleased(KeyEvent e) {
+        if (focusedWindow != null) {
+            // e.setConsumed(false);
+            // focusedWindow.consumeEvent(e);
+            focusedWindow.sendKeyEvent(e.getEventType(), e.getModifiers(),
+                                       e.getKeyCode(), e.getKeyCode(), (char) e.getKeySymbol());
+        }
+    }
+
+    @Override
+    public int getLastY() {
+        if (lastMouse != null)
+            return lastMouse.getY();
+        return 0;
+    }
+
+    @Override
+    public int getLastX() {
+        if (lastMouse != null)
+            return lastMouse.getX();
+        return 0;
+    }
+}