/*

* Copyright (c) 2007-2008 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:   Layout that performs cross fade

 *

*/

#ifndef __SHWCROSSFADELAYOUT_H__

#define __SHWCROSSFADELAYOUT_H__

#include <glxlayout.h>

#include "shwtimedvalue.h"

// FORWARD DECLARATIONS

class CHuiCurvePath;

/**

 * TShwCrossFadeLayout. 

 * Layout that handles crossfade effect.

 * @author Kimmo Hoikka

 * @lib shwslideshowengine.lib

 * @internal reviewed 07/06/2007 by Loughlin

 */

NONSHARABLE_CLASS( TShwCrossFadeLayout ) : public TGlxLayout

	{

	public:

		/**

		 * Constructor, initializes the layout.

		 */

		TShwCrossFadeLayout();

		/**

		 * Destructor

		 */

		~TShwCrossFadeLayout();

		/**

		 * Specifies the opacity value

		 * @param aOpacity the desired opacity target

		 * @param aDuration the target time for opacity

		 */

		void Set( TReal32 aOpacity, TInt aDuration = 0 );

		/**

		 * This method pauses zoom and pan

		 */

		void Pause();

		/**

		 * This method resumes zoom and pan after pause.

		 */

		void Resume();

	protected:	// From TGlxLayout

		/// @ref TGlxLayout::DoSetLayoutValues

		void DoSetLayoutValues( TGlxLayoutInfo& aInfo );

		/// @ref TGlxLayout::DoChanged

		TBool DoChanged() const;

		/// @ref TGlxLayout::DoClearChanged

		void DoClearChanged();

	private:	// Data and private parts

		/// Own: the opacity

		TShwTimedValue iOpacity;

	};

#endif // __SHWCROSSFADELAYOUT_H__