/*

* Copyright (c) 2006 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:  Thumbnail loader

*

*/

#ifndef MPXCOLLECTIONVIEWHGTNLOADER_H_

#define MPXCOLLECTIONVIEWHGTNLOADER_H_

#include <e32base.h>

#include <thumbnailmanager.h> // needs to be included here because of a bug in thumbnailmanagerobserver.h

#include <thumbnailmanagerobserver.h>

class CThumbnailManager;

class CFbsBitmap;

class CAsyncCallBack;

/**

 * Observer iface

 */

class MMpxTNLoaderObserver

    {

public:

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

    };

/**

 * TN Loader

 */

NONSHARABLE_CLASS( CMpxTNLoader ) : public CBase, public MThumbnailManagerObserver

    {

public: // CONSTRUCTORS & DESCTRUCTOR

    static CMpxTNLoader* NewL(MMpxTNLoaderObserver& aObserver, TThumbnailSize aSize );

    virtual ~CMpxTNLoader();

public: // NEW FUNCTIONS

    void LoadThumbL(TInt aIndex, const TDesC& aFileName );

    void CancelThumb( TInt aIndex );

    void CancelAll();

    void SetSizeL( TThumbnailSize aSize );

    void Pause( TTimeIntervalMicroSeconds32 aDelay );

    void Resume();

private: // From MThumbnailManagerObserver

    void ThumbnailPreviewReady( MThumbnailData& aThumbnail,

        TThumbnailRequestId aId );

    void ThumbnailReady( TInt aError, MThumbnailData& aThumbnail,

        TThumbnailRequestId aId );

private: // CONSTRUCTORS

    CMpxTNLoader(MMpxTNLoaderObserver& aObserver,

            TThumbnailSize aSize );

    void ConstructL();

private: // NEW FUNCTIONS

    TInt FindLoadingById(TThumbnailRequestId aId, TBool aRemove = EFalse);

    TInt FindLoadingByIndex(TInt aIndex, TBool aRemove = EFalse);

    static TInt LoadThumbnail( TAny* aSelf );

    void LoadNextTNL();

    static TInt ResumeCallback(TAny* aPtr);

private: // DATA

    MMpxTNLoaderObserver& iObserver;

    CThumbnailManager* iTnEngine; // Own

    // Loading information

    class TLoadingTN

        {

    public:

        TLoadingTN(TThumbnailRequestId aId, TInt aIndex, const TDesC& aFileName )

        : iId(aId), iIndex(aIndex), iFileName( aFileName )

            {

            }

        TThumbnailRequestId iId;

        TInt iIndex;

        TFileName iFileName;

        };

    RPointerArray<TLoadingTN> iLoading; // Loading Thubmbs

    CAsyncCallBack* iAsyncCallBack;

    TThumbnailSize iSize;

    TBool iPaused;

    CPeriodic* iPauseTimer;

    };

#endif // MPXCOLLECTIONVIEWHGTNLOADER_H_