--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wvuing/wvaudiomanager/Inc/CCAPropertyObserver.h	Thu Dec 17 08:41:52 2009 +0200
@@ -0,0 +1,120 @@
+/*
+* Copyright (c) 2004-2005 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:  Publish & Subscribe property change observer
+*
+*/
+
+
+#ifndef CCAPROPERTYOBSERVER_H
+#define CCAPROPERTYOBSERVER_H
+
+//  INCLUDES
+#include <e32base.h>        // CActive
+#include <e32property.h>    // RProperty
+
+#include "MCAPropertyNotificationObserver.h"
+
+
+// CLASS DECLARATION
+
+/**
+*  Implementation of the Publish & Subscribe property change observer
+*
+*  @lib MGXMediaFileAPI.lib
+*  @since 2.6
+*/
+NONSHARABLE_CLASS( CCAPropertyObserver ) : public CActive
+    {
+public:  // Constructors and destructor
+
+    /**
+    * Two-phased constructor.
+    * @param aObserver Observer to be informed when observed
+    *                  property changes
+    */
+    static CCAPropertyObserver* NewL(
+        MCAPropertyNotificationObserver& aObserver );
+
+    /**
+    * Destructor.
+    */
+    virtual ~CCAPropertyObserver();
+
+public:     // New functions
+
+    /**
+    * Starts observing the given key for any changes
+    * Notifies the observer when the property changes
+    * @since 2.6
+    * @param aCategory, Category of the observed property
+    * @param aKey, Observed property
+    */
+    void ObservePropertyChangeL( TUid aCategory, TUint aKey );
+
+    /**
+    * Stops observing the key given with call ObserverPropertyChangeL
+    */
+    void CancelObserve( );
+
+    /**
+    * Gets the uid this observer is observing
+    * @return the category
+    */
+    TUid Category();
+
+    /**
+    * Gets the uid this observer is observing
+    * @return the key
+    */
+    TUint Key();
+
+
+protected:  // Functions from base classes
+
+    /**
+    * From CActive
+    */
+    void RunL();
+
+    /**
+    * From CActive
+    */
+    void DoCancel();
+
+private:
+
+    /**
+    * C++ default constructor.
+    */
+    CCAPropertyObserver( MCAPropertyNotificationObserver& aObserver );
+
+
+private:    // Data
+
+    // Owns: Observed property
+    RProperty iProperty;
+
+    // Observer to be informed when property changes
+    MCAPropertyNotificationObserver& iObserver;
+
+    // the category this observer is attached to
+    TUid iCategory;
+    // the key this observer is attached to
+    TUint iKey;
+
+    };
+
+#endif      // CCAPROPERTYOBSERVER_H
+
+// End of File