/*

* Copyright (c) 2002 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:  Declares Registry watcher class for BTUI.

*

*/

#ifndef CBTUIREGISTRYWATCHERAO_H

#define CBTUIREGISTRYWATCHERAO_H

// INCLUDES

#include <bt_subscribe.h>

// CLASS DECLARATION

/**

* A callback interface for informing content change of BT Registry.

*/

class MBTUIRegistryObserver

    {

    public: // New functions

        /**

        * Informs the observer that contents of Registry has been changed.

        * @param None.

        * @return None.

        */

        virtual void RegistryContentChangedL()=0;

    };

// CLASS DECLARATION

/**

* An active object based class which can used to listen

* Registry changes

*/

class CBTUIRegistryWatcherAO : public CActive

    {

    public: // Constructors and destructor

        /**

        * C++ default constructor.

        */

        CBTUIRegistryWatcherAO( MBTUIRegistryObserver* aParent );

        /**

        * Destructor.

        */

        virtual ~CBTUIRegistryWatcherAO();

    public: // New functions

        /**

        * Starts / continues Registry watching

        *

        * @param None.

        * @return None.

        */

        void WatchL();

        /**

        * Starts / continues Registry watching

        *

        * @param None.

        * @return None.

        */

        void StopWatching();

    private: // Functions from base classes

        /**

        * From CActive Gets called when CActive::Cancel is called, 

        *              cancels Registry watching.

        *

        * @param None.

        * @return None.

        */

        void DoCancel();

        /**

        * From CActive Gets called when content of Registry is changed, 

        *              calls MBTUIRegistryObserver::RegistryContentChangedL.

        *

        * @param None.

        * @return None.

        */

        void RunL();       

        /**

        * From CActive Handles a leave occurring in the request completion event.        

        *

        * @param aError The leave code.

        * @return Symbian OS error code.

        */

        TInt RunError(TInt aError);

    private: // Data

        // Reference to observer

        MBTUIRegistryObserver* iParent;

        // Database handle

        RProperty iProperty;

    };

#endif

// End of File