--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/photosgallery/slideshow/utils/shwcallback.h	Thu Dec 17 08:45:44 2009 +0200
@@ -0,0 +1,63 @@
+/*
+* Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiary(-ies). 
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:    Thin callback wrapper
+ *
+*/
+
+
+
+
+// include guard for the whole file content
+#ifndef __TSHWCALLBACK_H__
+#define __TSHWCALLBACK_H__
+
+/**
+ * Helper class to construct a TCallBack from any 
+ * public non static TInt (*method)() of a class
+ * Usage:
+ *      TShwCallBack< %ClassName%, %MethodName% >( 
+ *          %ClassPointer% )
+ * Example:
+ *      TShwCallBack< CShwEngineImpl, DoStartL >( 
+ *          this );
+ */
+template< class Object, TInt (Object::*Method)() >
+NONSHARABLE_CLASS( TShwCallBack ) : public TCallBack
+	{
+	public:
+		/**
+		 * Constructor.
+		 * @param aInstance the object instance of the class 
+		 */
+		inline TShwCallBack( Object* aInstance )
+			: TCallBack( &DelegateL, aInstance )
+			{}
+
+	private:
+		/**
+		 * The callback delegator. Inlined as we dont want
+		 * extra method to be created, static so that base
+		 * class can call it without pointer to this.
+		 * @param aInstance the instance to call back
+		 * @return the return value for the TCallBack
+		 */
+		inline static TInt DelegateL( TAny* aInstance )
+			{
+			// Dispatch the call to the real objects method
+			return ( static_cast< Object* >( aInstance )->*Method )();
+			}
+	};
+
+
+#endif // __TSHWCALLBACK_H__