/*

* Copyright (c) 2010 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:  Ctelbubbleimagescaler declaration

*

*/

#ifndef TELBUBBLEIMAGESCALER_H

#define TELBUBBLEIMAGESCALER_H

// INCLUDES

#include <e32base.h>

// FORWARD DECLARATIONS

class CFbsBitmap;

class CBitmapScaler;

/**

 *  Interface to observe scaling status

 */

class MTelBubbleImageScalerObserver

{

public:

    /**

     * Callback to indicate scaling completion

     * 

     * @param aError Error occured during scaling

     * @param aBitmap Scaled bitmap

     */

    virtual void ImageScalingComplete

                (TInt aError, CFbsBitmap* aBitmap) = 0;

    };

/**

 *  Asynchronous bitmap scaler.

 *  Uses CBitmapScaler to do scaling

 */

class CTelBubbleImageScaler : public CActive

{

public:

    // Cancel and destroy

    ~CTelBubbleImageScaler();

    /** Two phase constructor */

    static CTelBubbleImageScaler* NewL(MTelBubbleImageScalerObserver& aObserver);

    /** Two phase constructor */

    static CTelBubbleImageScaler* NewLC(MTelBubbleImageScalerObserver& aObserver);

    /**

     *  Scaling status

     */

    enum TState

        {

        EScalingIdle = 0, EScalingStarted, EScalingDone

        };

public:

    /**

     * Starts bitmap scaling Asynchronously 

     * @param aSrc Bitmap that needs to be scaled

     * @param aTarget Scaled bitmap

     * @return None.

     */

    void StartScaleL(CFbsBitmap* aSrc, CFbsBitmap* aTarget);

    /**

     * Sets the state of Scaler 

     * @param aState State to be set

     * @return None.

     */

    void SetState(TState aState);

    /**

     * Returns the current state of Scaler 

     * @param None

     * @return TInt State of the scaler

     */   

    TInt GetState();

private:

    /* constructor */

    CTelBubbleImageScaler(MTelBubbleImageScalerObserver& aObserver);

    /* Second-phase constructor */

    void ConstructL();

private: // From CActive

    /*

     * Handle completion

     */

    void RunL();

    /*

     * Cancels active request

     */

    void DoCancel();

    /*

     * Override to handle leaves from RunL(). Default implementation causes

     * the active scheduler to panic.

     */

    TInt RunError(TInt aError);

private:

    /* 

     * Scaler observer instance 

     */

    MTelBubbleImageScalerObserver& iObserver;

    /*

     * Own: Bitmap scaler

     */

    CBitmapScaler* iScaler;

    /* 

     * Own: The bitmap that is scaled.

     */

    CFbsBitmap* iScaledBitmap;

    /*

     * Scaler state

     */

    TInt iState;

    };

#endif // TELBUBBLEIMAGESCALER_H

// End of File