--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/systemswstubs/ssyreference/inc/ssypslistener.h	Mon Oct 25 16:38:55 2010 +0300
@@ -0,0 +1,131 @@
+/*
+* 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:  Listener for PS key changes
+*
+*/
+
+
+#ifndef SSYPSLISTENER_H
+#define SSYPSLISTENER_H
+
+#include <e32base.h>
+#include <ecom/ecom.h>
+#include <e32property.h>
+
+/**
+* A callback interface for handling PS notifications
+*
+* @since S60 5.0
+*/
+class MSsyPsObserver
+    {
+    public:
+
+        /** 
+        * Called when the subscribed value is set.
+        * All changes are not guarateed to be notified but latest value will
+        * always be notified.
+        *
+        * @since S60 5.0
+        * @param aCategory The category of ps value that was set
+        * @param aKey The key id of ps value that was set
+        * @param aValue The value that was set
+        */
+        virtual void PsValueSet( TUid aCategory, 
+                                 TUint aKey,
+                                 TInt aValue ) = 0;
+    };
+    
+/**
+* Listens for specified PS key value and notifies observer
+* when the key is set.
+*
+* @since S60 5.0
+*/
+class CSsyPsListener : public CActive
+    {
+    public:
+        
+        /**
+        * Two-phased constructor.
+        *
+        * @since S60 5.0
+        * @param aObserver Callback object for informing about PS value sets
+        * @param aCategory The category of ps value that was set
+        * @param aKey The key id of ps value that was set
+        */
+        static CSsyPsListener* NewL( MSsyPsObserver& aObserver,
+                                     TUid aCategory, 
+                                     TUint aKey );
+        /**
+        * Destructor.
+        */
+        virtual ~CSsyPsListener();
+
+    protected:
+
+        // From CActive
+        void RunL();
+        TInt RunError(TInt aError);
+        void DoCancel();
+        
+        /**
+        * C++ constructor
+        *
+        * @since S60 5.0
+        */
+        CSsyPsListener(MSsyPsObserver& aObserver,
+                       TUid aCategory, 
+                       TUint aKey);
+
+        /**
+        * 2nd phase of construction.
+        *
+        * @since S60 5.0
+        */
+        void ConstructL();
+
+    private: // Member variables
+    
+        /**
+        * Observer for sets
+        * Not own.
+        */
+        MSsyPsObserver& iObserver;
+        
+        /**
+        * Property used for listening
+        */
+        RProperty iProperty;
+        
+        /**
+        * Category of the listened key
+        */
+        TUid iCategory;
+        
+        /**
+        * The listened key identifier
+        */
+        TUint iKey;
+        
+        /**
+        * The listened key value
+        */
+        TInt iValue;
+
+    };
+
+
+
+#endif // SSYPSLISTENER_H