/*

* 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:  A long task wrapper for load file

*

*/

#ifndef CNOTEPADLOADFILEAO_H

#define CNOTEPADLOADFILEAO_H

// INCLUDES

#include <e32base.h>

#include <txtetext.h>

#include <f32file.h>

#include "MNpdLoadFileObserver.h"

// FORWARD DECLARATIONS

class CCoeEnv;

class RFile;

class CPlainText;

class RFileReadStream;

// CONSTANTS

// the completed code for load file in one step

static const TInt KErrStep = 10000;

// CLASS DECLARATION

/**

*  The class implements a long task wrapper for load file

*

*  @lib NpdLib.lib

*  @since 5.2

*/

NONSHARABLE_CLASS(CNotepadLoadFileAO) : public CActive

    {

    public:

        static CNotepadLoadFileAO* NewL( MNotepadLoadFileObserver* aObserver,

                                         CCoeEnv& aCoeEnv,

                                         RFile& aFile, 

                                         TBool aGuessEncoding,

                                         TUint aEncoding, 

                                         CPlainText& aText );

        ~CNotepadLoadFileAO();

    public: // New functions

        /**

        * Starts load file .

        * @return start load file successful or not, KErrNone is sucessed, other failed

        * @since 5.2

        */

        TInt StartLoadFile( );

        /**

        * Cancels load file .

        * @since 5.2

        */

        void CancelLoadFile();

    private: // From CActive

        void RunL();

        void DoCancel();

    private:

        CNotepadLoadFileAO( MNotepadLoadFileObserver* aObserver,

                            CCoeEnv& aCoeEnv,

                            RFile& aFile, 

                            TBool aGuessEncoding,

                            TUint aEncoding, 

                            CPlainText& aText );

        void ConstructL();

        /**

        * Initialize import export param for CPlianText.

        * @since 5.2

        */

        void InitImportExportParamL();

        /**

        * Run step for load file.

        * @since 5.2

        */

        void DoStepL();

    private: // Data

        // Ref: Pointer to thread function observer

        MNotepadLoadFileObserver* iObserver;

        // Ref: refrence to Control environment

        CCoeEnv& iCoeEnv;

        // Own: the file object to load

        RFile iFile;

        // indicate guess encoding or not

        TBool iGuessEncoding;

        // aEncoding encoding of the File

        TUint iEncoding;

        // Ref: refrence to CPlainText object

        CPlainText& iText;

        // the size of the file to load

        TInt iFileSize;

        // the current pos of the file 

        TInt iReadPos;

        // indicate cancel load file or not

        TBool iCancel;

        // Own: the import export param for CPlianText

        CPlainText::TImportExportParam iParam;

    };

#endif // CNOTEPADLOADFILEAO_H

// End of File