/*

* 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 : Grid view Observers

*

*/

#ifndef GLXGRIDVIEWMLOBSERVER_H_

#define GLXGRIDVIEWMLOBSERVER_H_

// Photos Headers

#include <mglxmedialistobserver.h>

#include <glxfiltergeneraldefs.h>

// CONSTANTS

const TInt KNoOfPages(3);

const TInt KBufferTresholdSize(3);    // in rows

// FORWARD DECLARATIONS

class CGlxMediaList;

class CHgGrid;

class CGlxDRMUtility;

class MHgScrollBufferObserver;

//class CHgContextUtility;

// CLASS DECLARATION

class CGlxGridViewMLObserver: public CBase,

                              public MGlxMediaListObserver

    {

public:

    /**

     * Two-phased constructor.

     *

     * @return Pointer to newly created object.

     */

    IMPORT_C static CGlxGridViewMLObserver* NewL(

            MHgScrollBufferObserver& aHgScrollBufferObs,

            MGlxMediaList& aMediaList, CHgGrid* aHgGrid,

            TGlxFilterItemType aFilterType = EGlxFilterVideoAndImages);

    /**

     * Destructor.

     */

    virtual ~CGlxGridViewMLObserver();

public: // 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:

    /**

     * C++ default constructor.

     */

    CGlxGridViewMLObserver(MHgScrollBufferObserver& aHgScrollBufferObs,

            MGlxMediaList& aMediaList, CHgGrid* aHgGrid,

            TGlxFilterItemType aFilterType);

    /**

     * By default Symbian 2nd phase constructor is private.

     */

    void ConstructL();

    /**

     * HandleErrorL is added to make the compiler happy by reducing codescanner warnings

     * No extra purpose

     */

    void HandleErrorL();

    /**

     * Checks the availability of relevant thumbnail(Quality or Speed) attribute

     * @param aIndex Media index to check the thumbnail attribute

     * @return ETrue if relevant thumbnail available 

     *         EFalse if relevant thumbnail not available 

     */    

    TBool HasRelevantThumbnail(TInt aIndex);

    /**

     * RefreshScreenL - Refreshes the Hg Grid based on the attributes available index 

     * 

     */

    void RefreshScreenL(TInt aItemIndex,const RArray<TMPXAttribute>& aAttributes);

    /**

     * UpdateItemsL - Update the items with the DRM/video icon and  date/time

     * 

     */

    void UpdateItemsL (TInt aItemIndex,const RArray<TMPXAttribute>& aAttributes);

    /**

     * DisplayErrorNoteL - Show an error note based on input parameter

     * @param aError The error based on which the error note is to be shown. 

     */

	void DisplayErrorNoteL(TInt aError);

    /**

     * SetDefaultIconL - Sets the default icon for grid.

     * @param aTransparent - ETrue to set transparent icon; EFalse to set default icon. 

     */

    void SetDefaultIconL(TBool aTransparent);

    /**

     * SetIconL - Sets the grid cell icon with the given parameters

     * @param aItemIndex -  The grid cell index

     * @param aBitmapId - The bitmap id

     * @param aMaskId - The mask id

     * @param aFlags - The indicator flags	 

     */

    void SetIconL(TInt aItemIndex, TInt aBitmapId, TInt aMaskId, TInt aFlags);

private:

    // Hg Grid scroll buffer observer

    MHgScrollBufferObserver& iHgScrollBufferObs;

    MGlxMediaList& iMediaList;

    // Instance of HG Grid

    CHgGrid* iHgGrid;

    // Provides DRM related functionality

    CGlxDRMUtility* iDRMUtility;

    TSize iGridIconSize;

    // The Resource file name from which icons to be read

    TFileName iIconsFileName;  

    //No of visible items in a page/view

    TInt  iItemsPerPage;

    //Flag to indicate the grid default icon set status

    TBool iIsDefaultIconSet;

    // Variable to check if the error in disk (e.g disk error) has been shown to the user.  

    // If a disk is full the user should not be intimated everytime over and over again.

    TInt  iDiskErrorIntimated;

    // Modified Indexes array to refresh the screen

    RArray<TInt> iModifiedIndexes;

    //Grid Thumbnail Attribs

    TMPXAttribute iQualityTnAttrib;

    TMPXAttribute iSpeedTnAttrib;    

    // Filtertype, Image / Video

    TGlxFilterItemType iFilterType;

    };

#endif //GLXGRIDVIEWMLOBSERVER_H_