/*

* 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:   CUniEditorChangeSlideOperation, asynchronous operation for changing slide    

*

*/

#ifndef __UNIEDITORCHANGESLIDEOPERATION_H

#define __UNIEDITORCHANGESLIDEOPERATION_H

// INCLUDES

#include <unislideloader.h>

#include "UniEditorOperation.h"

#include "UniEditorDocument.h"

#include "UniEditorSaveOperation.h"

// CONSTANTS

// MACROS

// FORWARD DECLARATIONS

class CUniEditorHeader;

class CUniSlideLoader;

class CMsgEditorView;

// DATA TYPES

// FUNCTION PROTOTYPES

// CLASS DECLARATION

/**

* CUniEditorChangeSlideOperation, Storage for single attachment in presentation. 

*

* @since 3.2

*/

class CUniEditorChangeSlideOperation : public CUniEditorOperation,

                                       public MUniSlideLoaderObserver

    {

    public:  // New methods

        /**

        * Factory method that creates this object.

        *

        * @since    3.2

        * @param    aObserver

        * @return   Pointer to instance in cleanup stack

        */

        static CUniEditorChangeSlideOperation* NewL( MUniEditorOperationObserver& aOperationObserver,

                                                     CUniEditorDocument& aDocument,

                                                     CUniEditorHeader& aHeader,

                                                     CUniSlideLoader& aSlideLoader,

                                                     CMsgEditorView& aView,

                                                     RFs& aFs );

        /**

        * Destructor

        */

        virtual ~CUniEditorChangeSlideOperation();

        /**

        * Start slide changing

        */

        void ChangeSlide( TInt aNextNum );

    private:

        /**

        * From MUniSlideLoaderObserver

        */

        void SlideLoadReady( TInt aError );

        /**

        * From CActive

        */

        void RunL();

        /**

        * From CUniEditorOperation

        */

        void DoCancelCleanup();

        /**

        * From CUniEditorOperation

        */

        void HandleOperationEvent( TUniEditorOperationType aOperation,

                                   TUniEditorOperationEvent aEvent );

        /**

        * Performs change slide step

        */

        void DoChangeSlideStepL();

        /**

        * Performs save step

        */

        void DoSaveL();

        /**

        * Performs load step

        */

        void DoLoadL();

        /**

        * Performs finalization step

        */

        void DoFinalizeL();

    protected: 

        /**

        * Constructor.

        */

        CUniEditorChangeSlideOperation( MUniEditorOperationObserver& aOperationObserver,

                                        CUniEditorDocument& aDocument,

                                        CUniEditorHeader& aHeader,

                                        CUniSlideLoader& aSlideLoader,

                                        CMsgEditorView& aView,

                                        RFs& aFs );

        /**

        * 2nd phase constructor.

        */

        void ConstructL();

    protected: // data

        enum TUniEditorChangeSlideState

            {

            EUniEditorChangeSlideSave,

            EUniEditorChangeSlideLoad,

            EUniEditorChangeSlideFinalize,

            EUniEditorChangeSlideEnd

            };

        CUniEditorHeader& iHeader;

        CUniSlideLoader& iSlideLoader;

        CMsgEditorView& iView;

        TInt iNextNum;

        CUniEditorSaveOperation* iSaveOperation;

    };

#endif // __UNIEDITORCHANGESLIDEOPERATION_H