mpxplugins/viewplugins/views/collectionviewhg/inc/mpxcollectionviewhgtnloader.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 12 Mar 2010 15:42:25 +0200
branchRCL_3
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permissions -rw-r--r--
Revision: 201007 Kit: 201008
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/*
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* Copyright (c) 2006 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:  Thumbnail loader
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*
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*/
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#ifndef MPXCOLLECTIONVIEWHGTNLOADER_H_
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#define MPXCOLLECTIONVIEWHGTNLOADER_H_
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#include <e32base.h>
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#include <thumbnailmanager.h> // needs to be included here because of a bug in thumbnailmanagerobserver.h
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#include <thumbnailmanagerobserver.h>
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class CThumbnailManager;
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class CFbsBitmap;
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class CAsyncCallBack;
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/**
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 * Observer iface
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 */
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class MMpxTNLoaderObserver
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    {
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public:
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    virtual void TNReadyL(TInt aError, CFbsBitmap* aBitmap, CFbsBitmap* aMask, TInt aIndex) = 0;
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    };
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/**
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 * TN Loader
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 */
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NONSHARABLE_CLASS( CMpxTNLoader ) : public CBase, public MThumbnailManagerObserver
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    {
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public: // CONSTRUCTORS & DESCTRUCTOR
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    static CMpxTNLoader* NewL(MMpxTNLoaderObserver& aObserver, TThumbnailSize aSize );
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    virtual ~CMpxTNLoader();
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public: // NEW FUNCTIONS
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    void LoadThumbL(TInt aIndex, const TDesC& aFileName );
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    void CancelThumb( TInt aIndex );
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    void CancelAll();
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    void SetSizeL( TThumbnailSize aSize );
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    void Pause( TTimeIntervalMicroSeconds32 aDelay );
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    void Resume();
0
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private: // From MThumbnailManagerObserver
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    void ThumbnailPreviewReady( MThumbnailData& aThumbnail,
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        TThumbnailRequestId aId );
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    void ThumbnailReady( TInt aError, MThumbnailData& aThumbnail,
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        TThumbnailRequestId aId );
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private: // CONSTRUCTORS
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    CMpxTNLoader(MMpxTNLoaderObserver& aObserver,
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            TThumbnailSize aSize );
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    void ConstructL();
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private: // NEW FUNCTIONS
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    TInt FindLoadingById(TThumbnailRequestId aId, TBool aRemove = EFalse);
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    TInt FindLoadingByIndex(TInt aIndex, TBool aRemove = EFalse);
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    static TInt LoadThumbnail( TAny* aSelf );
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    void LoadNextTN();
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    static TInt ResumeCallback(TAny* aPtr);
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private: // DATA
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    MMpxTNLoaderObserver& iObserver;
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    CThumbnailManager* iTnEngine; // Own
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    // Loading information
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    class TLoadingTN
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        {
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    public:
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        TLoadingTN(TThumbnailRequestId aId, TInt aIndex, const TDesC& aFileName )
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        : iId(aId), iIndex(aIndex), iFileName( aFileName )
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            {
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            }
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        TThumbnailRequestId iId;
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        TInt iIndex;
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        TFileName iFileName;
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        };
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    RPointerArray<TLoadingTN> iLoading; // Loading Thubmbs
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    CAsyncCallBack* iAsyncCallBack;
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    TThumbnailSize iSize;
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    TBool iPaused;
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    CPeriodic* iPauseTimer;
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    };
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#endif // MPXCOLLECTIONVIEWHGTNLOADER_H_