/*

* 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 : Class header for preview thumbnail in list view

*

*/

#ifndef _GLXPREVIEWTHUMBNAILBINDING_H_

#define _GLXPREVIEWTHUMBNAILBINDING_H_

#include "glxbinding.h"              // The binding is created by the binding set factory.

#include "glxmedialistiterator.h"    // Interface for going through items in the list in a  non-sequential order

#include "mglxmedialistobserver.h"   // Observes for changes in media list

#include <memory>                    

class GlxThumbnailVariantType;

class CGlxThumbnailContext;          // Fetch context to retrieve thumbnails

/**

 * Observer interface

 */

class MPreviewTNObserver 

    {

public:

    virtual void PreviewTNReadyL(CFbsBitmap* aBitmap, CFbsBitmap* aMask, TInt aIndex) = 0;

    };

// CLASS DECLARATION

/**

 * Implementation of preview thumbnail binding for the 

 * list view. 

 * 

 */ 

 NONSHARABLE_CLASS(CGlxPreviewThumbnailBinding) : public CBase,

                                                  public MGlxMediaListObserver

 	{

 public:

	/**

	  * Two phase construction

	  * @param aMulTag Mul field that the binding corresponds to

	  */

	static CGlxPreviewThumbnailBinding* NewL (MPreviewTNObserver& aObserver);

	/**

	 * Two phase construction

	 */

	static CGlxPreviewThumbnailBinding* NewLC(MPreviewTNObserver& aObserver ); // takes ownership

	/**

	 * Destructor

	 */

	~CGlxPreviewThumbnailBinding();

private:

	 /**

	 * Constructor

	 */

	CGlxPreviewThumbnailBinding(MPreviewTNObserver& aObserver);

	/**

	 * Two phase construction

	 */

	void ConstructL();

public:	

      void HandleItemChangedL(const CMPXCollectionPath& aPath,

              TBool aPopulateListTNs, TBool aBackwardNavigation);

      void StartTimer(TBool aPopulateListTNs);

      void StopTimer();

      // From MGlxMediaListObserver

      void HandleItemAddedL( TInt aStartIndex, TInt aEndIndex, MGlxMediaList* aList );

      void HandleItemRemovedL( TInt aStartIndex, TInt aEndIndex, MGlxMediaList* aList );

      void HandleAttributesAvailableL( TInt aItemIndex, 

          const RArray<TMPXAttribute>& aAttributes, MGlxMediaList* aList );    

      void HandleFocusChangedL( NGlxListDefs::TFocusChangeType aType, 

      TInt aNewIndex, TInt aOldIndex, MGlxMediaList* aList );

      void HandleItemSelectedL(TInt aIndex, TBool aSelected, MGlxMediaList* aList );

      void HandleMessageL( const CMPXMessage& aMessage, MGlxMediaList* aList );

      void HandleError( TInt aError );

      void HandleCommandCompleteL( CMPXCommand* aCommandResult, TInt aError, 

          MGlxMediaList* aList );

      void HandleMediaL( TInt aListIndex, MGlxMediaList* aList );

      void HandleItemModifiedL( const RArray<TInt>& aItemIndexes, MGlxMediaList* aList );

      void HandlePopulatedL( MGlxMediaList* aList );

private:

	/**

	 * IsTimeL

	 */

	static TInt IsTimeL( TAny* aSelf );

	/**

	 * TimerTickedL

	 */

	void TimerTickedL();

private:

	MPreviewTNObserver& iObserver;	

	// Timer that checks for the time expiration

	CPeriodic* iTimer;

	//Medialist that holds the thumbnail information

	MGlxMediaList* iMediaList;

	// Thumbnail Attrib context

    CGlxAttributeContext* iThumbnailContext;	

	// for thumbnail context

	TGlxSequentialIterator iThumbnailIterator;

	// Preview thumbnail index

	TInt iProgressIndex;

	// flag that says whether timer has expired

	TBool iTimerTicked;

	//flag will be true, when initially the first thumbnails for all the 

	//items in the list are populated.

	TBool iPopulateListTNs;

    //it holds the initial number of thumbnail to be displayed

    RArray<TInt> iPreviewItemCount;

    TSize iGridIconSize;

    // Holds the numbers of trials count,after which PreviewTNReady callback

    // has to be called

    TInt iTrialCount;

    TInt iTrial;

    TBool iBackwardNavigation;

    CMPXFilter* iPreviewFilter;

};

#endif //_GLXPREVIEWTHUMBNAILBINDING_H_