/*

* Copyright (c) 2004 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:  Pure virtual base class for viewer observer.

*

*/

#ifndef IHLVIEWEROBSERVER_H

#define IHLVIEWEROBSERVER_H

// INCLUDES

#include <e32std.h>

// CLASS DECLARATION

/**

*  MIHLViewerObserver

*

*  Pure virtual base class for viewer observer.

*  @lib IHL.lib

*  @since 3.0

*/

class MIHLViewerObserver

	{

	public:

        /**

        * This callback is currently not supported!

        *

        * Notifies client of viewer events.

		* Event codes are defined in viewer header.

		* Leave situation is handled in ViewerError() callback.

        * @since 3.0

        * @param aEvent Type of event.

        * @param aEventCode1 Event specific code 1.

        * @param aEventCode2 Event specific code 2.

		*/

		virtual void ViewerEventL( TInt /*aEvent*/, TInt /*aEventCode1*/, TInt /*aEventCode2*/ ) {}

		/**

        * Notifies client when viewer bitmap content is changed.

		* Leave situation is handled in ViewerError() callback.

        * @since 3.0

		*/

		virtual void ViewerBitmapChangedL() = 0;

        /**

        * Notifies client if error occurs in viewer.

        * @since 3.0

        * @param aError System wide error code.

		*/

		virtual void ViewerError( TInt aError ) = 0;

	};

#endif // IHLIMAGEVIEWEROBSERVER_H

// End of File