/*

* 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:    Layout blender

*

*/

#ifndef C_GLXBLENDLAYOUTBLEND_H

#define C_GLXBLENDLAYOUTBLEND_H

#include <glxlayout.h>

/**

 *  TGlxBlendLayout 

 *

 *  Blender of multiple MGlxLayouts based on coefficients

 *

 *  @lib glxlayouts.lib

 */

//@TODO : Class wont be used - To be removed 

class TGlxBlendLayout : public TGlxLayout

	{

	public:

		/**

		 * Constructor, reset the values

		 */

		IMPORT_C TGlxBlendLayout();

		/**

		 * Destructor

		 */

		IMPORT_C ~TGlxBlendLayout();

		/**

		 * Add a layout to be blended

		 * @param aLayout the layout to add, cannot be NULL

		 */

		IMPORT_C void AddLayoutL( MGlxLayout* aLayout );

		/**

		 * Remove an existing layout

		 * @param aLayout the layout to remove

		 */

		IMPORT_C void RemoveLayout( const MGlxLayout* aLayout );

		/**

		 * Remove all existing layouts

		 */

		IMPORT_C void RemoveAllLayouts();

	protected:	// From TGlxLayout

		/// @ref TGlxLayout::DoSetLayoutValues

		void DoSetLayoutValues( TGlxLayoutInfo& aInfo );

		/// @ref TGlxLayout::DoChanged

		TBool DoChanged() const;

		/// @ref TGlxLayout::DoClearChanged

		void DoClearChanged();

	private:

		/**

		 * Helper struct to store the layout and layout info

		 */

		struct TLayout

			{

			/// Ref: the layout

			MGlxLayout* iLayout;

			/// Own: the layoutinfo for the layout

			TGlxLayoutInfoResetter iLayoutInfo;

			/**

			 * Helper to tell whether two TLayout structs match

			 */

			static TBool Match( const TLayout& aLhs, const TLayout& aRhs );

			};

		/// Own: array of cached layout infos

		RArray< TLayout > iLayouts;

		/**

		 * Changed flag to remember whether any layouts have been added or removed

		 * since the las call to DoClearChanged

		 */

		TBool iChanged;

	};

#endif // C_GLXBLENDLAYOUTBLEND_H