/*

* Copyright (c) 2006-2007 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:  Shrinker class in the Memory manager component

*

*/

#ifndef C_CMMMSHRINKER_H

#define C_CMMMSHRINKER_H

#include <e32base.h>

#include "cmcommon.h" // TCmListItemStatus

/* Forward declarations. */

class MCmMmObserver;

class CCmMmImageMetadataResolver;

class CFbsBitmap;

class CImageDecoder;

class CBitmapScaler;

class CImageEncoder;

class CCmDmMain;

/**

 *  CCmMmShrinker class

 *

 *  @lib cmmemorymanager.lib

 *  @since S60 v3.1

 */

class CCmMmShrinker : public CActive

    {

// States

    enum TImageState

        {

        EIdle = 0,

        EDecode,

        EScale,

        EEncode,

        EReplace

        };

public: // Constructors and destructor

    /**

     * Creates new CCmMmShrinker class and opens connection to database

     *

     * @since S60 3.1

     * @param aDbManager

     * @return pointer to CCmMmShrinker object

     */

    static CCmMmShrinker* NewL( CCmDmMain& aDbManager );

    /**

     * Creates new CCmMmShrinker class and opens connection to database and

     * leaves the instance in the cleanup stack

     *

     * @since S60 3.1

     * @param aDbManager

     * @return pointer to CCmMmShrinker object

     */

    static CCmMmShrinker* NewLC( CCmDmMain& aDbManager );

    /**

     * C++ destructor

     *

     * @since S60 3.1

     */

    virtual ~CCmMmShrinker();

public:     // New functions

    /**

     * Shrinks given images.

     *

     * @since S60 3.1

     * @param aFiles

     */

    void ShrinkImagesL( CDesCArray& aFiles );

    /**

     * Sets memory manager observer

     *

     * @since S60 3.1

     * @param aObserver

     */

    void SetObserver ( MCmMmObserver* aObserver );

protected: // Functions from base class

    /**

     * From CActive

     * Cancels any outstanding operation

     *

     * @since S60 3.1

     */

    void DoCancel();

    /**

     * Handles a leave occurring in the request

     * completion event handler RunL()

     *

     * @since S60 3.1

     * @param aError

     * @return error value

     */

    TInt RunError( TInt aError );

    /**

     * From CActive

     * Callback function

     * Invoked to handle responses from the server

     *

     * @since S60 3.1

     */

    void RunL();

 private: // New methods

    /**

     * Return screensize

     *

     * @since S60 3.1

     * @return screensize

     */

    TSize ScreenSizeL();

    /**

     * Returns the private path according to the specified file name

     *

     * @since S60 3.1

     * @param aFs handle to file server

     * @param aPrivatePath reference to descriptor where private path is 

                           modified.

     * @param aOriginal original file path used to define drive and file name

     */     

     void PrivatePath( RFs& aFs, 

                       TFileName& aPrivatePath, 

                       const TFileName& aOriginal );

    /**

     * Clear shrinker mermber variables

     *

     * @since S60 3.1

     * @param None

     */                       

     void ClearShrinker();                                              

private:

    /**

     * C++ constructor

     *

     * @since S60 3.1

     * @param aDbManager

     */

    CCmMmShrinker( CCmDmMain& aDbManager );

    /**

     * Second-phase constructor.

     *

     * @since S60 3.1

     * @param aFiles

     */

    void ConstructL();

private: // data

    RFs               iFileSession;

    TSize             iScreenSize;

    TInt              iShrinkIndex;

    TTime             iStartTime;

    TImageState       iState;

    TTime             iStopTime;

    MCmMmObserver*    iObserver;        // not owned

    CCmDmMain&        iDbManager;

    CFbsBitmap*       iBitmap;          // owned

    CBitmapScaler*    iBitmapScaler;    // owned

    CDesCArray*       iFiles;           // owned

    CImageDecoder*    iImageDecoder;    // owned

    CImageEncoder*    iImageEncoder;    // owned

    TFileName         iTempFilename;

    CCmMmImageMetadataResolver* iImageMetadataResolver;

    };

#endif //  C_CMMMSHRINKER_H