phonebookui/Phonebook2/UIControls/inc/CPbk2ThumbnailScaler.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 10:12:17 +0200
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/*
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* Copyright (c) 2002-2007 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: 
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*       Class for scaling bitmaps for the thumbnail control.
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*
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*/
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#ifndef CPBK2THUMBNAILSCALER_H
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#define CPBK2THUMBNAILSCALER_H
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// INCLUDES
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#include <e32base.h>
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// FORWARD DECLARATIONS
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class CFbsBitmap;
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class CBitmapScaler;
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/**
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 * Observer interface for the scaling process.
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 */
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NONSHARABLE_CLASS(MPbk2ThumbnailScalerObserver)
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    {
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    public:
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        /**
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         * Called when the thumbnail scaling completes.
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         * @param aError KErrNone if the scaling was done successfully,
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         *               otherwise one of the system wide error codes.
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         * @param aBitmap Result of the scaling operation
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         *                callee takes the ownership.
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         */
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        virtual void ThumbnailScalingComplete
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            (TInt aError, CFbsBitmap* aBitmap) = 0;
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    };
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/**
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 * Class for scaling bitmaps for the thumbnail control.
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 */
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NONSHARABLE_CLASS(CPbk2ThumbnailScaler) : 
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        public CActive
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    {
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    public:
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        /**
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         * Static 2-phased constructor.
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         * @param aObserver Observer for the scaling process.
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         * @return Newly created instance of CPbk2ThumbnailScaler.
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         */
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        static CPbk2ThumbnailScaler* NewL
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            (MPbk2ThumbnailScalerObserver& aObserver);
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        /**
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         * Standard C++ destructor.
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         */
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        ~CPbk2ThumbnailScaler();
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    public: // interface
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        /**
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         * Creates thumbnail from the givan bitmap.
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         * @param aBitmap Bitmap that will be converted to thumbnail.
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         *                This class takes ownership of the bitmap.
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         */
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        void CreateThumbnail(CFbsBitmap* aBitmap);
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    private: // From CActive
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        void RunL();
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        void DoCancel();
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        TInt RunError(TInt aError);
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    private: // Implementation
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        /**
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         * C++ constructor.
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         * @param aObserver Observer for the scaling process.
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         */
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        CPbk2ThumbnailScaler(MPbk2ThumbnailScalerObserver& aObserver);
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        /**
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         * Starts the scaling process.
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         * @param aBitmap The bitmap to be scaled.
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         * @param aSize Target size of the bitmap.
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         */
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        void StartScaleL(CFbsBitmap* aBitmap, const TSize& aSize);
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        /**
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         * Crops the bitmap if needed.
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         * @param aBitmap Bitmap to be cropped.
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         */
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        void DoCropL(CFbsBitmap* aBitmap);
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    private: // Data
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        /// Ref: Observer for the scaling process.
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        MPbk2ThumbnailScalerObserver& iObserver;
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        /// Own: Bitmap scaler
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        CBitmapScaler* iScaler;
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        /// Own: The bitmap that is scaled.
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        CFbsBitmap* iBitmap;
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    };
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#endif // CPBK2THUMBNAILSCALER_H
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//End of file