Bug 1362: Minimal action required: setBackground of the parent canvas before reparenting!

Bug 1362 fix or workaround: Seems SWT/GTK3 at least performs lazy initialization
Minimal action required: setBackground of the parent canvas before reparenting!

3 files changed, 12 insertions, 13 deletions

diff --git a/src/jogl/classes/com/jogamp/opengl/swt/GLCanvas.java b/src/jogl/classes/com/jogamp/opengl/swt/GLCanvas.java
index 58b5bbcb9..a34c8648a 100644
--- a/src/jogl/classes/com/jogamp/opengl/swt/GLCanvas.java
+++ b/src/jogl/classes/com/jogamp/opengl/swt/GLCanvas.java
@@ -62,6 +62,7 @@ import jogamp.opengl.GLDrawableHelper;
 import jogamp.opengl.GLDrawableImpl;
 
 import org.eclipse.swt.SWT;
+import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.graphics.Rectangle;
 import org.eclipse.swt.layout.FillLayout;
 import org.eclipse.swt.widgets.Canvas;
@@ -381,6 +382,10 @@ public class GLCanvas extends Canvas implements GLAutoDrawable, GLSharedContextS
       drawable = null;
       context = null;
 
+      // Bug 1362 fix or workaround: Seems SWT/GTK3 at least performs lazy initialization
+      // Minimal action required: setBackground of the parent canvas before reparenting!
+      setBackground(new Color(parent.getDisplay(), 255, 255, 255));
+
       final Listener listener = new Listener () {
           @Override
           public void handleEvent (final Event event) {
diff --git a/src/newt/classes/com/jogamp/newt/swt/NewtCanvasSWT.java b/src/newt/classes/com/jogamp/newt/swt/NewtCanvasSWT.java
index d1bd638d8..d30dbe6dc 100644
--- a/src/newt/classes/com/jogamp/newt/swt/NewtCanvasSWT.java
+++ b/src/newt/classes/com/jogamp/newt/swt/NewtCanvasSWT.java
@@ -41,7 +41,6 @@ import com.jogamp.nativewindow.NativeWindowFactory;
 import com.jogamp.nativewindow.NativeWindowHolder;
 import com.jogamp.nativewindow.SurfaceUpdatedListener;
 import com.jogamp.nativewindow.WindowClosingProtocol;
-import com.jogamp.nativewindow.WindowClosingProtocol.WindowClosingMode;
 import com.jogamp.nativewindow.util.Insets;
 import com.jogamp.nativewindow.util.InsetsImmutable;
 import com.jogamp.nativewindow.util.Point;
@@ -54,6 +53,7 @@ import jogamp.newt.Debug;
 import jogamp.newt.swt.SWTEDTUtil;
 
 import org.eclipse.swt.SWT;
+import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.graphics.Rectangle;
 import org.eclipse.swt.widgets.Canvas;
 import org.eclipse.swt.widgets.Composite;
@@ -139,6 +139,10 @@ public class NewtCanvasSWT extends Canvas implements NativeWindowHolder, WindowC
             setNEWTChild(child);
         }
 
+        // Bug 1362 fix or workaround: Seems SWT/GTK3 at least performs lazy initialization
+        // Minimal action required: setBackground of the parent canvas before reparenting!
+        setBackground(new Color(parent.getDisplay(), 255, 255, 255));
+
         final Listener listener = new Listener () {
             @Override
             public void handleEvent (final Event event) {
diff --git a/src/test/com/jogamp/opengl/test/junit/jogl/swt/TestSWTAccessor02NewtGLWindow.java b/src/test/com/jogamp/opengl/test/junit/jogl/swt/TestSWTAccessor02NewtGLWindow.java
index dafd8f07a..6694df65a 100644
--- a/src/test/com/jogamp/opengl/test/junit/jogl/swt/TestSWTAccessor02NewtGLWindow.java
+++ b/src/test/com/jogamp/opengl/test/junit/jogl/swt/TestSWTAccessor02NewtGLWindow.java
@@ -160,19 +160,9 @@ public class TestSWTAccessor02NewtGLWindow extends UITestCase {
             SWTAccessor.invoke(true, new Runnable() {
                 public void run() {
                     canvas[0] = new Canvas (composite, SWT.NO_BACKGROUND);
-                    // Bug 1362 fix or workaround: Seems GTK3 at least performs lazy initialization
-                    // Minimal action required: setBackground + fillRectangle of some space in canvas ONCE before reparenting!
-                    final boolean paintedOnce[] = { false };
+                    // Bug 1362 fix or workaround: Seems SWT/GTK3 at least performs lazy initialization
+                    // Minimal action required: setBackground of the parent canvas before reparenting!
                     canvas[0].setBackground(new Color(display, 255, 255, 255));
-                    canvas[0].addPaintListener (new PaintListener() {
-                        public void paintControl(final PaintEvent e) {
-                            if( !paintedOnce[0] ) {
-                                paintedOnce[0] = true;
-                                final Rectangle r = canvas[0].getClientArea();
-                                e.gc.fillRectangle(0, 0, r.width, r.height);
-                                canvas[0].removePaintListener(this);
-                            }
-                        }});
                     shell.setText( getClass().getName() );
                     shell.setBounds( 0, 0, 700, 700 );
                     shell.open();