ncdengine/inc/ncdnodepreview.h
author Simon Howkins <simonh@symbian.org>
Mon, 22 Nov 2010 12:04:39 +0000
branchRCL_3
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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:   Contains MNcdNodePreview
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*
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*/
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#ifndef M_NCD_NODE_PREVIEW_H
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#define M_NCD_NODE_PREVIEW_H
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#include <e32cmn.h>
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#include "catalogsbase.h"
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#include "ncdinterfaceids.h"
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class MNcdDownloadOperation;
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class MNcdDownloadOperationObserver;
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class RFile;
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/**
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 *  This interface is provided if the node contains preview content.
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 *  One node may contain multiple preview items.
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 *
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 *  
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 */
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class MNcdNodePreview : public virtual MCatalogsBase
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    {
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public:
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    /**
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     * Unique identifier for the interface, required for all MCatalogsBase interfaces.
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     *
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     * 
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     */
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    enum { KInterfaceUid = ENcdNodePreviewUid };
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    /**
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     * Gives the number of previews of the node.
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     *
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     * @note This count is given according to the protocol information
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     * that informs how many previews are available. So, the information
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     * can be asked before calling LoadPreviewL. But, to get the
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     * data of the wanted preview, LoadPreviewL has to be called.
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     *
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     * @return The number of preview items.
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     */
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    virtual TInt PreviewCount() const = 0;
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    /**
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     * IsPreviewLoadedL informs if the preview has already been loaded for the
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     * node. Then, call of LoadPreviewL is not necessary.
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     *
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     * @param aIndex tells which one of the previews is wanted.
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     * @return ETrue if the preview has already been loaded, EFalse otherwise.
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     * @exception Panic ENcdPanicIndexOutOfRange Array index out of range.
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     */
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    virtual TBool IsPreviewLoadedL( TInt aIndex ) const = 0;
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    /**
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     * Gives the mime type of the preview data.
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     *
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     * This mime type is set according to the information gotten
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     * from the protocol if any. So, this information is available before 
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     * calling LoadPreviewL for the preview item of the given index. 
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     *
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     * @note If the mime type is not received in protocol responses, it is
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     * taken from Content-Type HTTP header after the preview has been downloaded
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     * successfully
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     *
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     * @param aIndex tells which one of the previews is wanted.
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     * @return The mime type of the preview data. The type is
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     * given as a text according to the standards that define MIME types.
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     * Ownership is transferred. If the protocol has not defined
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     * any value, KNullDesC is returned.
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     * @exception Panic ENcdPanicIndexOutOfRange Array index out of range.
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     */
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    virtual const TDesC& PreviewMimeType( TInt aIndex ) const = 0;
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    /**
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     * Loads the preview data from the internet.
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     *
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     * @note The reference count of the operation object is increased by one. 
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     * So, Release() function of the operation should be called when operation 
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     * is not needed anymore.
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     *
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     * @param aIndex tells which one of the previews is wanted.
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     * @param aObserver Observer for the operation.
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     * @return Pointer to an operation object that handles
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     *  the preview data downloading. This operation can be used
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     *  to check the progressing of the preview download. Counted, Release() must
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     *  be called after use.
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     * @exception Leave System wide error codes.
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     *  KNcdErrorParallelOperationNotAllowed if a parallel client is running
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     *  an operation for the same metadata. See MNcdOperation for full explanation.
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     * @exception Panic ENcdPanicIndexOutOfRange Array index out of range.
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     */
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    virtual MNcdDownloadOperation* LoadPreviewL( TInt aIndex,
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        MNcdDownloadOperationObserver* aObserver ) = 0;
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    /**
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     * Gives the preview data file.
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     *
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     * @note RFile handle can be used to get the unifying id for example
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     * using RFile::FullName.
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     * @note The MIME type of the preview may be found automatically
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     * from the preview data by Symbian methods.
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     *
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     * @param aIndex tells which one of the previews is wanted. 
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     * @return Handle to a file containing the preview data. Ownership is transferred.
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     *  So, the user has to call Close when the file is not needed anymore.
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     * @exception KErrNotFound if the corresponding preview data 
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     *  has not been downloaded for the specified preview item.
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     * @exception Leave System wide error codes.
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     * @exception Panic ENcdPanicIndexOutOfRange Array index out of range.
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     */
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    virtual RFile PreviewFileL( TInt aIndex ) const = 0;
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protected:
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    /**
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     * Destructor.
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     * 
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     * @see MCatalogsBase::~MCatalogsBase()
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     */
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    virtual ~MNcdNodePreview() {}
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    };
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#endif // M_NCD_NODE_PREVIEW_H