--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mmappcomponents/mmappcommonui/backsteppingutility/inc/mpxbacksteppingutilityimp.h	Thu Dec 17 08:55:47 2009 +0200
@@ -0,0 +1,170 @@
+/*
+* Copyright (c) 2007 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:  MPX back stepping utility singleton
+*
+*/
+
+ 
+#ifndef CMPXBACKSTEPPINGUTILITYIMP_H
+#define CMPXBACKSTEPPINGUTILITYIMP_H
+
+// INCLUDES
+#include <e32base.h>
+#include <mpxbacksteppingutility.h>
+
+// FORWARD DECLARATIONS
+class MLiwInterface;
+class CLiwGenericParamList;
+class CLiwServiceHandler;
+
+// CLASS DECLARATION
+
+/**
+*  Music Player common utility class
+ *
+ *  @lib mpxbacksteppingutility.lib
+ *  @since S60 v3.2
+*/
+NONSHARABLE_CLASS( CMPXBackSteppingUtilityImp )
+    : public CBase
+    , public MMPXBackSteppingUtility
+    {
+public: 
+
+    /**
+     * Retrieve a back stepping utility of this thread.  All clients in this thread
+     * shares the same utility (singleton)
+     * Call Close() when this object is not needed anymore.
+     *
+     * @since 3.2
+     * @return Pointer to backstepping utility. Ownership not transferred.
+     */
+    static MMPXBackSteppingUtility* UtilityL();
+
+    /**
+     * This method must be called when this object can be freed. This object 
+     * will be destroyed when no one is using it.
+     *
+     * @since 3.2
+     */
+    void Close();
+
+    /**
+     * Forwards activation event
+     *
+     * @since S60 v3.2
+     * @param aState state of application like view ids
+     * @param aEnter indicate if it is entry/exit activation
+     * @return result code retutned by BS Service interface
+     * @leave leaves from HandleResultL are propagated
+     */
+    TInt ForwardActivationEventL(
+        const TDesC8& aState,
+        const TBool aEnter );
+    
+    /**
+     * Handles back command
+     *
+     * @since S60 v3.2
+     * @param aState state of application like view ids
+     * @return result code retutned by BS Service interface
+     * @leave leaves from HandleResultL are propagated
+     */
+    TInt HandleBackCommandL( const TDesC8& aState );
+
+    /**
+     * Initializes BS Service
+     * @param aUid client application UID
+     * @leave KErrNotSupported or KErrArgument 
+     *        (if arguments passed to BS Service are incorrect 
+     *        or could not initialize BS)
+     *        KErrNotFound (if there was no return value)
+     */
+    void InitializeL( const TUid aUid );
+    
+private:
+
+    /**
+    * C++ constructor
+    */
+    CMPXBackSteppingUtilityImp();
+
+    /**
+    *  Destuctor
+    */ 
+    virtual ~CMPXBackSteppingUtilityImp();
+   
+    /**
+     * 2nd phase constructor
+     */
+    void ConstructL();
+    
+    /**
+    *  Two phased contructor
+    */ 
+    static CMPXBackSteppingUtilityImp* NewL(); 
+    static CMPXBackSteppingUtilityImp* NewLC(); 
+
+    /**
+     * Store utility to TLS.
+     *
+     * @param aUtility Utility object. Ownership not transferred.
+     */
+    static void StoreUtility( MMPXBackSteppingUtility* aUtility );
+
+    /**
+     * Handles the result of a LIW command
+     * @return result code retutned by BS Service interface
+     * @leave KErrNotSupported or KErrArgument 
+     *        (if arguments passed to BS Service are incorrect)
+     *        KErrNotFound (if there was no return value)
+     */
+    TInt HandleResultL();
+
+private: // data
+    
+    /**
+     * Reference count.
+     */
+    TInt iRefCount;
+    
+    /**
+     * AIW Service Handler
+     * Own.
+     */
+    CLiwServiceHandler* iServiceHandler;
+    
+    /**
+     * BS Service interface returned by LIW
+     * Own.
+     */
+    MLiwInterface* iBSInterface;
+    
+    /**
+     * In param list
+     * Not own.
+     */
+    CLiwGenericParamList* iInParamList;
+    
+    /**
+     * Out param list
+     * Not own.
+     */
+    CLiwGenericParamList* iOutParamList;
+
+    };
+
+#endif  // CMPXBACKSTEPPINGUTILITYIMP_H
+
+// End of File