Fix Bug 560 and NEWT window closing behavior in general for all platforms.

- NEWT/WindowImpl:
  - 'void windowDestroyNotify()' -> 'boolean windowDestroyNotify(boolean force)', allowing to signal a forced close,
    as well as replying whether the window has been closed. (called by native code)

  - destroy(): set states before releasing the window lock

- NEWT/X11: Pass windowDeleteAtom for reconfigure window, in case of reparenting child to top-level

- NEWT/OSX:
  - Add 'BOOL windowShouldClose()' impl., ie. having a chance to reject the close attempt
  - Common impl. for 'windowShouldClose' and 'windowWillClose' -> 'windowClosingImpl'
    utilizing new 'windowDestroyNotify' code (see above).
    Fixes bug 560.

- NEWT/JOGLNewtApplet1Run: Refine out-of browser window behavior for window-close button
  - default: move NEWT window back to browser parent
  - closeable: close NEWT window

- jogl-test-applets: Add NApplet-Closeable test (Applet out-of browser window is closable)

14 files changed, 139 insertions, 42 deletions

diff --git a/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtApplet1Run.java b/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtApplet1Run.java
index a052f6f97..82562636b 100755
--- a/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtApplet1Run.java
+++ b/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtApplet1Run.java
@@ -36,6 +36,7 @@ import java.awt.event.KeyListener;
 import java.awt.event.MouseListener;
 import java.awt.event.MouseMotionListener;
 
+import javax.media.nativewindow.WindowClosingProtocol;
 import javax.media.opengl.FPSCounter;
 import javax.media.opengl.GLCapabilities;
 import javax.media.opengl.GLEventListener;
@@ -64,7 +65,7 @@ import com.jogamp.newt.opengl.GLWindow;
  *  </p>
  *  
  *  <p>
- *  Example of an applet tag using GearsES2 in an undecorated, translucent and always-on-top window: 
+ *  Example of an applet tag using GearsES2 in an undecorated, translucent, closeable and always-on-top window: 
  *  <pre>
         &lt;applet width=1 height=1&gt;
            &lt;param name="java_arguments" value="-Dsun.java2d.noddraw=true"&gt;
@@ -73,6 +74,7 @@ import com.jogamp.newt.opengl.GLWindow;
            &lt;param name="gl_swap_interval" value="1"&gt;
            &lt;param name="gl_undecorated" value="true"&gt;
            &lt;param name="gl_alwaysontop" value="true"&gt;
+           &lt;param name="gl_closeable" value="true"&gt;
            &lt;param name="gl_alpha" value="1"&gt;
            &lt;param name="gl_multisamplebuffer" value="0"&gt;
            &lt;param name="gl_opaque" value="false"&gt;
@@ -115,6 +117,7 @@ public class JOGLNewtApplet1Run extends Applet {
         boolean glTrace=false;
         boolean glUndecorated=false;
         boolean glAlwaysOnTop=false;
+        boolean glCloseable=false;
         boolean glOpaque=true;
         int glAlphaBits=0;
         int glNumMultisampleBuffer=0;
@@ -128,6 +131,7 @@ public class JOGLNewtApplet1Run extends Applet {
             glTrace = JOGLNewtAppletBase.str2Bool(getParameter("gl_trace"), glTrace);
             glUndecorated = JOGLNewtAppletBase.str2Bool(getParameter("gl_undecorated"), glUndecorated);
             glAlwaysOnTop = JOGLNewtAppletBase.str2Bool(getParameter("gl_alwaysontop"), glAlwaysOnTop);
+            glCloseable = JOGLNewtAppletBase.str2Bool(getParameter("gl_closeable"), glCloseable);
             glOpaque = JOGLNewtAppletBase.str2Bool(getParameter("gl_opaque"), glOpaque);
             glAlphaBits = JOGLNewtAppletBase.str2Int(getParameter("gl_alpha"), glAlphaBits);
             glNumMultisampleBuffer = JOGLNewtAppletBase.str2Int(getParameter("gl_multisamplebuffer"), glNumMultisampleBuffer); 
@@ -157,6 +161,7 @@ public class JOGLNewtApplet1Run extends Applet {
             System.err.println("glTrace: "+glTrace);
             System.err.println("glUndecorated: "+glUndecorated);
             System.err.println("glAlwaysOnTop: "+glAlwaysOnTop);
+            System.err.println("glCloseable: "+glCloseable);
             System.err.println("glOpaque: "+glOpaque);
             System.err.println("glAlphaBits: "+glAlphaBits);
             System.err.println("glNumMultisampleBuffer: "+glNumMultisampleBuffer);
@@ -166,6 +171,7 @@ public class JOGLNewtApplet1Run extends Applet {
         base = new JOGLNewtAppletBase(glEventListenerClazzName, 
                                       glSwapInterval,
                                       glNoDefaultKeyListener,
+                                      glCloseable,
                                       glDebug,
                                       glTrace);
 
@@ -181,6 +187,7 @@ public class JOGLNewtApplet1Run extends Applet {
             glWindow.setUpdateFPSFrames(FPSCounter.DEFAULT_FRAMES_PER_INTERVAL, System.err);
             glWindow.setUndecorated(glUndecorated);
             glWindow.setAlwaysOnTop(glAlwaysOnTop);
+            glWindow.setDefaultCloseOperation(glCloseable ? WindowClosingProtocol.DISPOSE_ON_CLOSE : WindowClosingProtocol.DO_NOTHING_ON_CLOSE);
             container.setLayout(new BorderLayout());
             if(appletDebugTestBorder) {
                 container.add(new Button("North"), BorderLayout.NORTH);
diff --git a/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtAppletBase.java b/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtAppletBase.java
index 67da50210..9ffc24372 100755
--- a/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtAppletBase.java
+++ b/src/newt/classes/com/jogamp/newt/awt/applet/JOGLNewtAppletBase.java
@@ -32,6 +32,7 @@ import java.security.AccessController;
 import java.security.PrivilegedAction;
 
 import javax.media.nativewindow.NativeWindow;
+import javax.media.nativewindow.WindowClosingProtocol;
 import javax.media.opengl.FPSCounter;
 import javax.media.opengl.GL;
 import javax.media.opengl.GLAutoDrawable;
@@ -43,8 +44,10 @@ import jogamp.newt.Debug;
 import com.jogamp.newt.event.KeyEvent;
 import com.jogamp.newt.event.KeyListener;
 import com.jogamp.newt.event.MouseListener;
+import com.jogamp.newt.event.WindowAdapter;
 import com.jogamp.newt.event.WindowEvent;
 import com.jogamp.newt.event.WindowListener;
+import com.jogamp.newt.event.WindowUpdateEvent;
 import com.jogamp.newt.opengl.GLWindow;
 import com.jogamp.opengl.util.Animator;
 
@@ -58,6 +61,7 @@ public class JOGLNewtAppletBase implements KeyListener, GLEventListener {
     String glEventListenerClazzName;
     int glSwapInterval;
     boolean noDefaultKeyListener;
+    boolean glClosable;
     boolean glDebug;
     boolean glTrace;
 
@@ -70,12 +74,14 @@ public class JOGLNewtAppletBase implements KeyListener, GLEventListener {
     public JOGLNewtAppletBase(String glEventListenerClazzName, 
                               int glSwapInterval,
                               boolean noDefaultKeyListener,
+                              boolean glClosable,
                               boolean glDebug,
                               boolean glTrace) {
     
         this.glEventListenerClazzName=glEventListenerClazzName;
         this.glSwapInterval=glSwapInterval;
         this.noDefaultKeyListener = noDefaultKeyListener;
+        this.glClosable = glClosable;
         this.glDebug = glDebug;
         this.glTrace = glTrace;
     }
@@ -152,9 +158,25 @@ public class JOGLNewtAppletBase implements KeyListener, GLEventListener {
         init(Thread.currentThread().getThreadGroup(), glWindow);
     }
 
-    public void init(ThreadGroup tg, GLWindow glWindow) {
+    public void init(ThreadGroup tg, final GLWindow glWindow) {
         isValid = false;
         this.glWindow = glWindow;
+        this.glWindow.addWindowListener(new WindowAdapter() {
+                // Closing action: back to parent!
+                @Override
+                public void windowDestroyNotify(WindowEvent e) {
+                    if( WindowClosingProtocol.DO_NOTHING_ON_CLOSE == glWindow.getDefaultCloseOperation() ) {
+                        if(null == glWindow.getParent()) {
+                            // we may be called directly by the native EDT
+                            new Thread(new Runnable() {
+                               public void run() {
+                                // try { Thread.sleep(10); } catch (InterruptedException e) { }
+                                glWindow.reparentWindow(awtParent);
+                               }
+                            }).start();                         
+                        }                        
+                    }
+                } } );
 
         glEventListener = createInstance(glEventListenerClazzName);
         if(null == glEventListener) {
@@ -277,6 +299,9 @@ public class JOGLNewtAppletBase implements KeyListener, GLEventListener {
                 glWindow.reparentWindow(awtParent);
             } else {
                 glWindow.reparentWindow(null);
+                if(glClosable) {
+                    glWindow.setDefaultCloseOperation(WindowClosingProtocol.DISPOSE_ON_CLOSE);
+                }
             }
        }
     }
diff --git a/src/newt/classes/jogamp/newt/WindowImpl.java b/src/newt/classes/jogamp/newt/WindowImpl.java
index 3d465e45c..5e393f7c5 100644
--- a/src/newt/classes/jogamp/newt/WindowImpl.java
+++ b/src/newt/classes/jogamp/newt/WindowImpl.java
@@ -66,6 +66,7 @@ import javax.media.nativewindow.NativeWindow;
 import javax.media.nativewindow.NativeWindowException;
 import javax.media.nativewindow.NativeWindowFactory;
 import javax.media.nativewindow.SurfaceUpdatedListener;
+import javax.media.nativewindow.WindowClosingProtocol;
 import javax.media.nativewindow.util.DimensionImmutable;
 import javax.media.nativewindow.util.Insets;
 import javax.media.nativewindow.util.InsetsImmutable;
@@ -428,12 +429,12 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer
      * The implementation should invoke the referenced java state callbacks
      * to notify this Java object of state changes.</p>
      * 
-     * @see #windowDestroyNotify()
+     * @see #windowDestroyNotify(boolean)
      * @see #focusChanged(boolean, boolean)
      * @see #visibleChanged(boolean, boolean)
      * @see #sizeChanged(int,int)
      * @see #positionChanged(boolean,int, int)
-     * @see #windowDestroyNotify()
+     * @see #windowDestroyNotify(boolean)
      */
     protected abstract void createNativeImpl();
 
@@ -908,16 +909,18 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer
                     System.err.println("Window.destroy() END "+getThreadName()/*+", "+WindowImpl.this*/);
                 }
             } finally {
+                // update states before release window lock
+                setWindowHandle(0);
+                visible = false;
+                fullscreen = false;
+                hasFocus = false;
+                parentWindowHandle = 0;
+                
                 windowLock.unlock();
             }
             if(animatorPaused) {
                 lifecycleHook.resumeRenderingAction();
             }
-            setWindowHandle(0);
-            visible = false;
-            fullscreen = false;
-            hasFocus = false;
-            parentWindowHandle = 0;
             
             // these refs shall be kept alive - resurrection via setVisible(true)
             /**
@@ -1525,8 +1528,8 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer
     
     /**
      * If set to true, the default value, this NEWT Window implementation will
-     * handle the destruction (ie {@link #destroy()} call) within {@link #windowDestroyNotify()} implementation.<br>
-     * If set to false, it's up to the caller/owner to handle destruction within {@link #windowDestroyNotify()}.
+     * handle the destruction (ie {@link #destroy()} call) within {@link #windowDestroyNotify(boolean)} implementation.<br>
+     * If set to false, it's up to the caller/owner to handle destruction within {@link #windowDestroyNotify(boolean)}.
      */
     public void setHandleDestroyNotify(boolean b) {
         handleDestroyNotify = b;
@@ -2498,21 +2501,34 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer
         }
     }
     
-    protected void windowDestroyNotify() {
+    /**
+     * Triggered by implementation's WM events or programmatically
+     * 
+     * @param force if true, overrides {@link #setDefaultCloseOperation(int)} with {@link WindowClosingProtocol#DISPOSE_ON_CLOSE}
+     *              and hence force destruction. Otherwise is follows the user settings.
+     * @return true if this window is no more valid and hence has been destroyed, otherwise false.
+     */
+    protected boolean windowDestroyNotify(boolean force) {
         if(DEBUG_IMPLEMENTATION) {
-            System.err.println("Window.windowDestroyNotify START "+getThreadName());
+            System.err.println("Window.windowDestroyNotify(force: "+force+") START "+getThreadName()+": "+this);
+        }
+        if(force) {
+            setDefaultCloseOperation(WindowClosingProtocol.DISPOSE_ON_CLOSE);
         }
 
         // send synced destroy notifications
         enqueueWindowEvent(true, WindowEvent.EVENT_WINDOW_DESTROY_NOTIFY);
 
-        if(handleDestroyNotify && DISPOSE_ON_CLOSE == defaultCloseOperation) {
+        if(handleDestroyNotify && DISPOSE_ON_CLOSE == getDefaultCloseOperation()) {
             destroy();
         }
+        
+        final boolean destroyed = !isNativeValid();
 
         if(DEBUG_IMPLEMENTATION) {
-            System.err.println("Window.windowDestroyeNotify END "+getThreadName());
+            System.err.println("Window.windowDestroyNotify(force: "+force+") END "+getThreadName()+": destroyed "+destroyed+", "+this);
         }
+        return destroyed;
     }
 
     public void windowRepaint(int x, int y, int width, int height) {
diff --git a/src/newt/classes/jogamp/newt/driver/android/AndroidWindow.java b/src/newt/classes/jogamp/newt/driver/android/AndroidWindow.java
index 4547db831..63d5f7003 100644
--- a/src/newt/classes/jogamp/newt/driver/android/AndroidWindow.java
+++ b/src/newt/classes/jogamp/newt/driver/android/AndroidWindow.java
@@ -329,8 +329,7 @@ public class AndroidWindow extends jogamp.newt.WindowImpl implements Callback2 {
         if(0!=surfaceHandle && androidFormat != aFormat ) {
             // re-create
             Log.d(MD.TAG, "surfaceChanged (destroy old)");
-            windowDestroyNotify();
-            if(isNativeValid()) {
+            if(!windowDestroyNotify(true)) {
                 destroy();
             }
             surfaceHandle = 0;
@@ -371,7 +370,7 @@ public class AndroidWindow extends jogamp.newt.WindowImpl implements Callback2 {
     
     public void surfaceDestroyed(SurfaceHolder holder) {
         Log.d(MD.TAG, "surfaceDestroyed");
-        windowDestroyNotify();
+        windowDestroyNotify(true); // actually too late .. however ..
     }
 
     public void surfaceRedrawNeeded(SurfaceHolder holder) {
diff --git a/src/newt/classes/jogamp/newt/driver/macosx/MacWindow.java b/src/newt/classes/jogamp/newt/driver/macosx/MacWindow.java
index c926d44ee..b45c60e69 100644
--- a/src/newt/classes/jogamp/newt/driver/macosx/MacWindow.java
+++ b/src/newt/classes/jogamp/newt/driver/macosx/MacWindow.java
@@ -77,19 +77,19 @@ public class MacWindow extends WindowImpl implements SurfaceChangeable, DriverCl
     protected void closeNativeImpl() {
         try {
             if(DEBUG_IMPLEMENTATION) { System.err.println("MacWindow.CloseAction "+Thread.currentThread().getName()); }
-            if (getWindowHandle() != 0) {
-                close0(getWindowHandle());
+            final long handle = getWindowHandle(); 
+            setWindowHandle(0);
+            surfaceHandle = 0;
+            sscSurfaceHandle = 0;
+            isOffscreenInstance = false;            
+            if (0 != handle) {
+                close0(handle);
             }
         } catch (Throwable t) {
             if(DEBUG_IMPLEMENTATION) { 
                 Exception e = new Exception("Warning: closeNative failed - "+Thread.currentThread().getName(), t);
                 e.printStackTrace();
             }
-        } finally {
-            setWindowHandle(0);
-            surfaceHandle = 0;
-            sscSurfaceHandle = 0;
-            isOffscreenInstance = false;            
         }
     }
     
diff --git a/src/newt/classes/jogamp/newt/driver/x11/X11Window.java b/src/newt/classes/jogamp/newt/driver/x11/X11Window.java
index 703b18272..143b94a57 100644
--- a/src/newt/classes/jogamp/newt/driver/x11/X11Window.java
+++ b/src/newt/classes/jogamp/newt/driver/x11/X11Window.java
@@ -117,8 +117,10 @@ public class X11Window extends WindowImpl {
             // client position -> top-level window position
             x -= i.getLeftWidth() ;
             y -= i.getTopHeight() ;
-        }        
-        reconfigureWindow0( getDisplayEDTHandle(), getScreenIndex(), getParentWindowHandle(), getWindowHandle(),
+        }
+        final X11Display display = (X11Display) getScreen().getDisplay();
+        reconfigureWindow0( getDisplayEDTHandle(), getScreenIndex(), 
+                            getParentWindowHandle(), getWindowHandle(), display.getWindowDeleteAtom(),
                             x, y, width, height, flags);
 
         return true;
@@ -243,7 +245,7 @@ public class X11Window extends WindowImpl {
                                       int x, int y, int width, int height, boolean autoPosition, int flags); 
     private native void CloseWindow0(long display, long windowHandle, long javaObjectAtom, long windowDeleteAtom);
     private native void reconfigureWindow0(long display, int screen_index, long parentWindowHandle, long windowHandle,
-                                           int x, int y, int width, int height, int flags);    
+                                           long windowDeleteAtom, int x, int y, int width, int height, int flags);    
     private native void requestFocus0(long display, long windowHandle, boolean force);
     
     private static native void setTitle0(long display, long windowHandle, String title);
diff --git a/src/newt/native/KDWindow.c b/src/newt/native/KDWindow.c
index e6bc7952e..dc999138c 100644
--- a/src/newt/native/KDWindow.c
+++ b/src/newt/native/KDWindow.c
@@ -114,8 +114,10 @@ JNIEXPORT void JNICALL Java_jogamp_newt_driver_kd_KDDisplay_DispatchMessages
                 break;
             case KD_EVENT_WINDOW_CLOSE:
                 {
-                    DBG_PRINT( "event window close : src: %p\n", userData);
-                    (*env)->CallVoidMethod(env, javaWindow, windowDestroyNotifyID);
+                    jboolean closed;
+                    DBG_PRINT( "event window close : src: %p .. \n", userData);
+                    closed = (*env)->CallBooleanMethod(env, javaWindow, windowDestroyNotifyID, JNI_FALSE);
+                    DBG_PRINT( "event window close : src: %p, closed %d\n", userData, (int)closed);
                 }
                 break;
             case KD_EVENT_WINDOWPROPERTY_CHANGE:
@@ -189,7 +191,7 @@ JNIEXPORT jboolean JNICALL Java_jogamp_newt_driver_kd_KDWindow_initIDs
     windowCreatedID = (*env)->GetMethodID(env, clazz, "windowCreated", "(J)V");
     sizeChangedID = (*env)->GetMethodID(env, clazz, "sizeChanged", "(ZIIZ)V");
     visibleChangedID = (*env)->GetMethodID(env, clazz, "visibleChanged", "(ZZ)V");
-    windowDestroyNotifyID = (*env)->GetMethodID(env, clazz, "windowDestroyNotify",    "()V");
+    windowDestroyNotifyID = (*env)->GetMethodID(env, clazz, "windowDestroyNotify", "(Z)Z");
     sendMouseEventID = (*env)->GetMethodID(env, clazz, "sendMouseEvent", "(IIIIII)V");
     sendKeyEventID = (*env)->GetMethodID(env, clazz, "sendKeyEvent", "(IIIC)V");
     if (windowCreatedID == NULL ||
diff --git a/src/newt/native/MacWindow.m b/src/newt/native/MacWindow.m
index 5a35973cd..64871f11d 100644
--- a/src/newt/native/MacWindow.m
+++ b/src/newt/native/MacWindow.m
@@ -705,6 +705,8 @@ JNIEXPORT void JNICALL Java_jogamp_newt_driver_macosx_MacWindow_close0
     DBG_PRINT( "windowClose.0 - %p,%d, destroyNotifySent %d, view %p,%d, parent %p\n", 
         mWin, getRetainCount(mWin), destroyNotifySent, mView, getRetainCount(mView), pWin);
 
+    [mWin setUnrealized];
+
     if(NULL!=mView) {
         // cleanup view
         jobject javaWindowObject = [mView getJavaWindowObject];
@@ -763,6 +765,9 @@ JNIEXPORT jboolean JNICALL Java_jogamp_newt_driver_macosx_MacWindow_lockSurface0
   (JNIEnv *env, jclass clazz, jlong window)
 {
     NewtMacWindow *mWin = (NewtMacWindow*) ((intptr_t) window);
+    if(NO == [mWin isRealized]) {
+        return JNI_FALSE;
+    }
     NewtView * mView = (NewtView *) [mWin contentView];
     return [mView softLock] == YES ? JNI_TRUE : JNI_FALSE;
     /** deadlocks, since we render independent of focus
diff --git a/src/newt/native/NewtMacWindow.h b/src/newt/native/NewtMacWindow.h
index aa460ea88..c0912ad3c 100644
--- a/src/newt/native/NewtMacWindow.h
+++ b/src/newt/native/NewtMacWindow.h
@@ -110,6 +110,7 @@
     BOOL mouseVisible;
     BOOL mouseInside;
     BOOL cursorIsHidden;
+    BOOL realized;
     NSPoint lastInsideMousePosition;
 @public
     int cachedInsets[4]; // l, r, t, b
@@ -125,6 +126,8 @@
        isFullscreenWindow:(BOOL)isfs;
 - (void) release;
 - (void) dealloc;
+- (void) setUnrealized;
+- (BOOL) isRealized;
 
 - (void) updateInsets: (JNIEnv*) env;
 - (void) attachToParent: (NSWindow*) parent;
@@ -166,5 +169,10 @@
 - (void) rightMouseUp: (NSEvent*) theEvent;
 - (void) otherMouseDown: (NSEvent*) theEvent;
 - (void) otherMouseUp: (NSEvent*) theEvent;
+- (void) windowDidResize: (NSNotification*) notification;
+- (void) windowDidMove: (NSNotification*) notification;
+- (BOOL) windowClosingImpl: (BOOL) force;
+- (BOOL) windowShouldClose: (id) sender;
+- (void) windowWillClose: (NSNotification*) notification;
 
 @end
diff --git a/src/newt/native/NewtMacWindow.m b/src/newt/native/NewtMacWindow.m
index 187aec7fb..f914467af 100644
--- a/src/newt/native/NewtMacWindow.m
+++ b/src/newt/native/NewtMacWindow.m
@@ -337,7 +337,7 @@ static jmethodID windowRepaintID = NULL;
     insetsChangedID = (*env)->GetMethodID(env, clazz, "insetsChanged", "(ZIIII)V");
     positionChangedID = (*env)->GetMethodID(env, clazz, "positionChanged", "(ZII)V");
     focusChangedID = (*env)->GetMethodID(env, clazz, "focusChanged", "(ZZ)V");
-    windowDestroyNotifyID    = (*env)->GetMethodID(env, clazz, "windowDestroyNotify",    "()V");
+    windowDestroyNotifyID = (*env)->GetMethodID(env, clazz, "windowDestroyNotify", "(Z)Z");
     windowRepaintID = (*env)->GetMethodID(env, clazz, "windowRepaint", "(ZIIII)V");
     requestFocusID = (*env)->GetMethodID(env, clazz, "requestFocus", "(Z)V");
     if (enqueueMouseEventID && sendMouseEventID && enqueueKeyEventID && sendKeyEventID && sizeChangedID && visibleChangedID && insetsChangedID &&
@@ -372,6 +372,7 @@ static jmethodID windowRepaintID = NULL;
     mouseVisible = YES;
     mouseInside = NO;
     cursorIsHidden = NO;
+    realized = YES;
     return res;
 }
 
@@ -393,6 +394,16 @@ static jmethodID windowRepaintID = NULL;
     [super dealloc];
 }
 
+- (void) setUnrealized
+{
+    realized = NO;
+}
+
+- (BOOL) isRealized
+{
+    return realized;
+}
+
 - (void) updateInsets: (JNIEnv*) env
 {
     NSView* nsview = [self contentView];
@@ -942,8 +953,19 @@ static jint mods2JavaMods(NSUInteger mods)
     }
 }
 
+- (BOOL)windowShouldClose: (id) sender
+{
+    return [self windowClosingImpl: NO];
+}
+
 - (void)windowWillClose: (NSNotification*) notification
 {
+    [self windowClosingImpl: YES];
+}
+
+- (BOOL) windowClosingImpl: (BOOL) force
+{
+    jboolean closed = JNI_FALSE;
     NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
 
     [self cursorHide: NO];
@@ -969,17 +991,22 @@ static jint mods2JavaMods(NSUInteger mods)
             return;
         }
 
-        [view setDestroyNotifySent: true];
-        (*env)->CallVoidMethod(env, javaWindowObject, windowDestroyNotifyID);
+        [view setDestroyNotifySent: true]; // earmark assumption of being closed
+        closed = (*env)->CallBooleanMethod(env, javaWindowObject, windowDestroyNotifyID, force ? JNI_TRUE : JNI_FALSE);
+        if(!force && !closed) {
+            // not closed on java side, not force -> clear flag
+            [view setDestroyNotifySent: false];
+        }
 
         if (shallBeDetached) {
             (*jvmHandle)->DetachCurrentThread(jvmHandle);
         }
-        DBG_PRINT( "*************** windowWillClose.X: %p\n", (void *)(intptr_t)javaWindowObject);
+        DBG_PRINT( "*************** windowWillClose.X: %p, closed %d\n", (void *)(intptr_t)javaWindowObject, (int)closed);
     } else {
         DBG_PRINT( "*************** windowWillClose (skip)\n");
     }
     [pool release];
+    return JNI_TRUE == closed ? YES : NO ;
 }
 
 @end
diff --git a/src/newt/native/WindowsWindow.c b/src/newt/native/WindowsWindow.c
index 97fe6f28d..6d9c04dc3 100644
--- a/src/newt/native/WindowsWindow.c
+++ b/src/newt/native/WindowsWindow.c
@@ -810,7 +810,7 @@ static LRESULT CALLBACK wndProc(HWND wnd, UINT message,
     //    Java::DestroyWindow(wnd) _or_ window-close-button -> 
     //     WM_CLOSE -> Java::windowDestroyNotify -> W_DESTROY
     case WM_CLOSE:
-        (*env)->CallVoidMethod(env, window, windowDestroyNotifyID);
+        (*env)->CallBooleanMethod(env, window, windowDestroyNotifyID, JNI_FALSE);
         break;
 
     case WM_DESTROY:
@@ -1297,7 +1297,7 @@ JNIEXPORT jboolean JNICALL Java_jogamp_newt_driver_windows_WindowsWindow_initIDs
     positionChangedID = (*env)->GetMethodID(env, clazz, "positionChanged", "(ZII)V");
     focusChangedID = (*env)->GetMethodID(env, clazz, "focusChanged", "(ZZ)V");
     visibleChangedID = (*env)->GetMethodID(env, clazz, "visibleChanged", "(ZZ)V");
-    windowDestroyNotifyID    = (*env)->GetMethodID(env, clazz, "windowDestroyNotify", "()V");
+    windowDestroyNotifyID = (*env)->GetMethodID(env, clazz, "windowDestroyNotify", "(Z)Z");
     windowRepaintID = (*env)->GetMethodID(env, clazz, "windowRepaint", "(ZIIII)V");
     enqueueMouseEventID = (*env)->GetMethodID(env, clazz, "enqueueMouseEvent", "(ZIIIIII)V");
     sendMouseEventID = (*env)->GetMethodID(env, clazz, "sendMouseEvent", "(IIIIII)V");
diff --git a/src/newt/native/X11Display.c b/src/newt/native/X11Display.c
index 9b99aebb5..88ac0df7e 100644
--- a/src/newt/native/X11Display.c
+++ b/src/newt/native/X11Display.c
@@ -266,7 +266,7 @@ JNIEXPORT jboolean JNICALL Java_jogamp_newt_driver_x11_X11Display_initIDs0
     focusChangedID = (*env)->GetMethodID(env, X11NewtWindowClazz, "focusChanged", "(ZZ)V");
     visibleChangedID = (*env)->GetMethodID(env, X11NewtWindowClazz, "visibleChanged", "(ZZ)V");
     reparentNotifyID = (*env)->GetMethodID(env, X11NewtWindowClazz, "reparentNotify", "(J)V");
-    windowDestroyNotifyID = (*env)->GetMethodID(env, X11NewtWindowClazz, "windowDestroyNotify", "()V");
+    windowDestroyNotifyID = (*env)->GetMethodID(env, X11NewtWindowClazz, "windowDestroyNotify", "(Z)Z");
     windowRepaintID = (*env)->GetMethodID(env, X11NewtWindowClazz, "windowRepaint", "(ZIIII)V");
     enqueueMouseEventID = (*env)->GetMethodID(env, X11NewtWindowClazz, "enqueueMouseEvent", "(ZIIIIII)V");
     sendMouseEventID = (*env)->GetMethodID(env, X11NewtWindowClazz, "sendMouseEvent", "(IIIIII)V");
@@ -563,9 +563,12 @@ JNIEXPORT void JNICALL Java_jogamp_newt_driver_x11_X11Display_DispatchMessages0
                 break;
             case ClientMessage:
                 if (evt.xclient.send_event==True && evt.xclient.data.l[0]==wm_delete_atom) { // windowDeleteAtom
-                    DBG_PRINT( "X11: event . ClientMessage call %p type 0x%X\n", 
+                    jboolean closed;
+                    DBG_PRINT( "X11: event . ClientMessage call %p type 0x%X ..\n", 
                         (void*)evt.xclient.window, (unsigned int)evt.xclient.message_type);
-                    (*env)->CallVoidMethod(env, jwindow, windowDestroyNotifyID);
+                    closed = (*env)->CallBooleanMethod(env, jwindow, windowDestroyNotifyID, JNI_FALSE);
+                    DBG_PRINT( "X11: event . ClientMessage call %p type 0x%X, closed: %d\n", 
+                        (void*)evt.xclient.window, (unsigned int)evt.xclient.message_type, (int)closed);
                     // Called by Window.java: CloseWindow(); 
                     num_events = 0; // end loop in case of destroyed display
                 }
diff --git a/src/newt/native/X11Window.c b/src/newt/native/X11Window.c
index 9d4ff5aaa..0f93b3e76 100644
--- a/src/newt/native/X11Window.c
+++ b/src/newt/native/X11Window.c
@@ -730,11 +730,13 @@ static Bool WaitForReparentNotify( Display *dpy, XEvent *event, XPointer arg ) {
  * Signature: (JIJJIIIII)V
  */
 JNIEXPORT void JNICALL Java_jogamp_newt_driver_x11_X11Window_reconfigureWindow0
-  (JNIEnv *env, jobject obj, jlong jdisplay, jint screen_index, jlong jparent, jlong jwindow, 
+  (JNIEnv *env, jobject obj, jlong jdisplay, jint screen_index,
+   jlong jparent, jlong jwindow, jlong windowDeleteAtom,
    jint x, jint y, jint width, jint height, jint flags)
 {
     Display * dpy = (Display *) (intptr_t) jdisplay;
     Window w = (Window)jwindow;
+    Atom wm_delete_atom = (Atom)windowDeleteAtom;
     Window root = RootWindow(dpy, screen_index);
     Window parent = (0!=jparent)?(Window)jparent:root;
     XEvent event;
@@ -810,6 +812,7 @@ JNIEXPORT void JNICALL Java_jogamp_newt_driver_x11_X11Window_reconfigureWindow0
         XReparentWindow( dpy, w, parent, x, y ); // actual reparent call
         // XIfEvent( dpy, &event, WaitForReparentNotify, (XPointer) w );
         XSync(dpy, False);
+        XSetWMProtocols(dpy, w, &wm_delete_atom, 1); // windowDeleteAtom
     }
 
     if( TST_FLAG_CHANGE_DECORATION(flags) ) {
diff --git a/src/test/jogamp/newt/WindowImplAccess.java b/src/test/jogamp/newt/WindowImplAccess.java
index e8be5f68a..3387a2ae2 100644
--- a/src/test/jogamp/newt/WindowImplAccess.java
+++ b/src/test/jogamp/newt/WindowImplAccess.java
@@ -38,7 +38,7 @@ public class WindowImplAccess {
         final WindowImpl winImpl = (WindowImpl) win.getDelegatedWindow();
         winImpl.runOnEDTIfAvail(true, new Runnable() {
             public void run() {
-                winImpl.windowDestroyNotify();
+                winImpl.windowDestroyNotify(false);
             }
         });        
     }