/*

* Copyright (c) 2008-2009 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:    Visual list observer interface

*

*/

/**

 * @internal reviewed 04/07/2007 by M Byrne

 */

#ifndef M_GLXVISUALLISTOBSERVER_H

#define M_GLXVISUALLISTOBSERVER_H

#include <e32std.h>

#include <glxlistdefs.h>

class MGlxVisualList;

class CAlfVisual;

/**

 *  MGlxVisualListObserver 

 * 

 *  Observer to a list of visuals

 *

 * @author Aki Vanhatalo

 */

class MGlxVisualListObserver 

	{

public:

	/**	

	 * Focus has changed.

	 * @param aFocusIndex new focus index

	 * @param aItemsPerSecond speed of focus change

	 * @param aList The visual list to which this notification relates

	 * @param aType Type/direction of focus change

	 */

	virtual void HandleFocusChangedL(TInt aFocusIndex, TReal32 aItemsPerSecond,

		MGlxVisualList* aList, NGlxListDefs::TFocusChangeType aType) = 0;

	/**

	 * Size of the rendering area has changed

	 * @param aSize new size of the area

	 * @param aList The visual list to which this notification relates

	 */	

	virtual void HandleSizeChanged(const TSize& aSize,

		MGlxVisualList* aList) = 0;

	/**

	 * Visual is being removed. The visual instance will be 

	 * destroyed after this call returns.

	 * @param aVisual The visual which is being removed

	 * @param aList The visual list to which this notification relates

	 */

	virtual void HandleVisualRemoved(const CAlfVisual* aVisual, 

		MGlxVisualList* aList) = 0;

	/**

	 * Visual has been added

	 * @param aVisual The new visual

	 * @param aIndex The list index of the new visual

	 * @param aList The visual list to which this notification relates

	 */

	virtual void HandleVisualAddedL( CAlfVisual* aVisual, TInt aIndex, 

		MGlxVisualList* aList) = 0;

	};

#endif // M_GLXVISUALLISTOBSERVER_H