--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/javauis/eswt_qt/com.nokia.swt.extensions/extensions/org/eclipse/swt/internal/extension/InternalUI.java	Fri Jun 11 13:33:44 2010 +0300
@@ -0,0 +1,77 @@
+/*******************************************************************************
+ * Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Nokia Corporation - initial implementation
+ *******************************************************************************/
+
+package org.eclipse.swt.internal.extension;
+
+import org.eclipse.swt.internal.qt.midp.UIThreadLauncher;
+import org.eclipse.swt.widgets.Display;
+import org.eclipse.swt.widgets.Internal_PackageSupport;
+
+/**
+ * A class that encapsulates services that enable the use of eSWT UI before the
+ * application has initialized its UI. This is achieved by utilizing an
+ * 'internal' instance of the Display class. I.e. an instance that is not
+ * revealed to the application but is only used internally within the API
+ * implementation.
+ * 
+ * The same rules apply to the internal Display instance that apply to the
+ * Display normally. When the Display is created then the creating thread
+ * becomes the UI thread of the process. The application needs to be able to
+ * obtain control of the UI thread. The services for interfacing with the
+ * application are provided by the class ApplicationUI.
+ * 
+ * @see ApplicationUI
+ */
+public final class InternalUI {
+	/**
+	 * Obtains the platform specific UI thread where SWT UI APIs can be accessed
+	 * in and calls the provided Runnable in it. This method instantly returns
+	 * leaving two threads running concurrently: the calling thread and the UI
+	 * thread. Only one UI thread can exist per process and this method can be
+	 * called only once to obtain it. Subsequent calls will result in an
+	 * exception being thrown. This method can be called by any thread.
+	 * 
+	 * @param runnable
+	 *            A Runnable to call back in the UI thread.
+	 * @exception RuntimeException
+	 *                If starting the UI thread fails
+	 */
+	public static void startInUIThread(Runnable runnable) {
+		if(!UIThreadLauncher.startInUIThread(runnable)) {
+			throw new RuntimeException("Failed to start the UI thread");
+		}
+	}
+	
+	/**
+	 * Creates the internal instance of Display. Must be called only once.
+	 * 
+	 * This means that the native resources required by the eSWT UI will be
+	 * initialized and a Display instance is returned that can be used to access
+	 * them normally via the public eSWT APIs. 
+	 * 
+	 * @return The internal Display instance
+	 * @see getInternalDisplayInstance
+	 */
+	public synchronized static Display createInternalDisplay() {
+		if(getInternalDisplayInstance() != null) {
+			throw new RuntimeException("Display already exists");
+		}
+		return Internal_PackageSupport.internalInstance();
+	}
+	
+	/**
+	 * Returns the internal Display instance or null if it doesn't exist. 
+	 * @return The internal Display instance or null
+	 */
+	public synchronized static Display getInternalDisplayInstance() {
+		return Internal_PackageSupport.getInternalDisplayInstance();
+	}
+}