--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/camerauis/cameraapp/generic/inc/CamPropertyWatcher.h	Wed Sep 01 12:30:54 2010 +0100
@@ -0,0 +1,129 @@
+/*
+* 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:  Callback wrapper for Publish and Subscribe
+*
+*  Copyright © 2007 Nokia.  All rights reserved.
+*  This material, including documentation and any related computer
+*  programs, is protected by copyright controlled by Nokia.  All
+*  rights are reserved.  Copying, including reproducing, storing,
+*  adapting or translating, any or all of this material requires the
+*  prior written consent of Nokia.  This material also contains
+*  confidential information which may not be disclosed to others
+*  without the prior written consent of Nokia.
+
+*
+*
+*/
+
+
+#ifndef CAMPROPERTYWATCHER_H
+#define CAMPROPERTYWATCHER_H
+
+//  INCLUDES
+#include <e32base.h>
+#include <e32property.h>
+
+// FORWARD DECLARATIONS
+class MPropertyObserver;
+
+// CLASS DECLARATION
+
+/**
+*  Class to watch for value changes on a property
+*
+*  @since 2.8
+*/
+class CCamPropertyWatcher : public CActive
+	{
+public: // Constructors and destructor
+    /**
+    * Symbian OS two-phased constructor
+    * @since 2.8
+    * @param aPropertyObserver The observer, notified when the value changes
+    * @param aCategory the category of the property
+    * @param aKey the identifier of the property
+    */      
+    static CCamPropertyWatcher* NewL( MPropertyObserver& aPropertyObserver, 
+                                      const TUid& aCategory, 
+                                      const TUint aKey );
+
+    /**
+    * Destructor.
+    * @since 2.8
+    */
+    ~CCamPropertyWatcher();
+
+public: // New methods
+
+    /**
+    * Register a need for notification of value changes
+    * @since 2.8
+    */
+    void Subscribe();
+
+    /**
+    * Return the current value of the property
+    * @since 2.8
+    * @param aValue Reference to an integer that will receive the current 
+    *                 value of the property
+    * @return KErrNone if successful otherwise another of the system-wide error 
+    *                 codes 
+    */
+	TInt Get( TInt& aValue );
+
+private: // new methods
+
+    /**
+    * C++ default constructor.
+    * @since 2.8
+    * @param aPropertyObserver Reference to observer of change events
+    * @param aCategory category of the property
+    * @param aKey identifier of the property
+    */
+    CCamPropertyWatcher( MPropertyObserver& aPropertyObserver, 
+                         const TUid& aCategory, 
+                         const TUint aKey );
+    /**
+    * Symbian 2nd phase constructor.
+    * @since 2.8
+    */
+    void ConstructL();
+
+public: // methods from base classes
+
+	/**
+    * From CActive
+    * @since 2.8
+    */
+    void RunL();
+
+private:
+
+    /**
+    * From CActive
+    * @since 2.8
+    */
+    void DoCancel();
+	
+private:
+
+    MPropertyObserver& iPropertyObserver;   // observer informed of change events
+    RProperty iProperty;                    // handle to the property
+    TUid iCategory;                         // category of the property
+    TUint iKey;                             // identifier of the property
+	};
+
+#endif // CAMPROPERTYWATCHER_H
+
+// End of File