modules/javafx.graphics/src/main/java/com/sun/glass/ui/gtk/GtkPlatformFactory.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2010, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2010, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -32,15 +32,73 @@
 import com.sun.glass.ui.Window;
 import com.sun.glass.ui.delegate.ClipboardDelegate;
 import com.sun.glass.ui.delegate.MenuBarDelegate;
 import com.sun.glass.ui.delegate.MenuDelegate;
 import com.sun.glass.ui.delegate.MenuItemDelegate;
+import com.sun.javafx.util.Logging;
+import sun.util.logging.PlatformLogger;
+
+import java.lang.reflect.Method;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
 
 public final class GtkPlatformFactory extends PlatformFactory {
+    private static final String SWT_INTERNAL_CLASS =
+                                              "org.eclipse.swt.internal.gtk.OS";
+    private static final int forcedGtkVersion;
+
+
+    static  {
+        //check for SWT-GTK lib presence
+        Class<?> OS = AccessController.
+                doPrivileged((PrivilegedAction<Class<?>>) () -> {
+                    try {
+                        return Class.forName(SWT_INTERNAL_CLASS, true,
+                                ClassLoader.getSystemClassLoader());
+                    } catch (Exception e) {}
+                    try {
+                        return Class.forName(SWT_INTERNAL_CLASS, true,
+                                Thread.currentThread().getContextClassLoader());
+                    } catch (Exception e) {}
+                    return null;
+                });
+        if (OS != null) {
+            PlatformLogger logger = Logging.getFocusLogger();
+            logger.fine("SWT-GTK library found. Try to obtain GTK version.");
+            Method method = AccessController.
+                    doPrivileged((PrivilegedAction<Method>) () -> {
+                        try {
+                            return OS.getMethod("gtk_major_version");
+                        } catch (Exception e) {
+                            return null;
+                        }
+                    });
+            int ver = 0;
+            if (method != null) {
+                try {
+                    ver = ((Number)method.invoke(OS)).intValue();
+                } catch (Exception e) {
+                    logger.warning("Method gtk_major_version() of " +
+                         "the org.eclipse.swt.internal.gtk.OS class " +
+                         "returns error. SWT GTK version cannot be detected. " +
+                         "GTK3 will be used as default.");
+                    ver = 3;
+                }
+            }
+            if (ver < 2 && ver > 3) {
+                logger.warning("SWT-GTK uses unsupported major GTK version "
+                        + ver + ". GTK3 will be used as default.");
+                ver = 3;
+            }
+            forcedGtkVersion = ver;
+        } else {
+            forcedGtkVersion = 0;
+        }
+    }
 
     @Override public Application createApplication(){
-        return new GtkApplication();
+        return new GtkApplication(forcedGtkVersion);
     }
 
     @Override public MenuBarDelegate createMenuBarDelegate(MenuBar menubar) {
         return new GtkMenuBarDelegate();
     }