/*

* ===========================================================================

*  Name        : HgPropListener.h

*  Part of     : Hg

*  Description : Class to get notifications about changes to a P&S property

*

*  Copyright © 2008 Nokia Corporation.

*  This material, including documentation and any related 

*  computer programs, is protected by copyright controlled by 

*  Nokia Corporation. All rights are reserved. Copying, 

*  including reproducing, storing, adapting or translating, any 

*  or all of this material requires the prior written consent of 

*  Nokia Corporation. This material also contains confidential 

*  information which may not be disclosed to others without the 

*  prior written consent of Nokia Corporation.

* ===========================================================================

*/

#ifndef __PROPLISTENER_H__

#define __PROPLISTENER_H__

#include <e32base.h>

#include <e32property.h>

/**

 * Observer interface for getting notifications about a P&S property change.

 */

class MHgPropertyChangeObserver

	{

public:

	virtual void PropertyChanged( TUid aCategory, TUint aKey ) = 0;

	};

/**

 * Class to get notifications about changes to a P&S property.

 */

NONSHARABLE_CLASS( CHgPropertyListener ) : public CActive

	{

public:

    /**

     * Constructor.

     * Starts listening for the property with the given category/key.

     */

	IMPORT_C CHgPropertyListener( TUid aCategory,

	    TUint aKey, MHgPropertyChangeObserver& aObserver );

	/**

	 * Destructor.

	 */

	IMPORT_C ~CHgPropertyListener();

private:

	void DoCancel();

	void RunL(); 

	TInt RunError( TInt aError );

	MHgPropertyChangeObserver& iObserver;

	RProperty iProperty;

	TUid iCategory;

	TUint iKey;

	};

#endif

// End of file