--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/engine/collectionframework/thumbnailcreator/inc/glxtnloadthumbnailtask.h Fri Mar 19 09:28:59 2010 +0200
@@ -0,0 +1,115 @@
+/*
+* 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: Base class for tasks which load thumbnails
+*
+*/
+
+
+
+#ifndef C_GLXTNLOADTHUMBNAILTASK_H
+#define C_GLXTNLOADTHUMBNAILTASK_H
+
+#include "glxtntask.h"
+#include "glxtnstd.h"
+
+// Forward declarations
+class CGlxtnFileInfo;
+class CGlxtnFileUtility;
+class CFbsBitmap;
+class CImageDecoder;
+class TGlxThumbnailRequest;
+
+/**
+ * Base class for tasks which load thumbnails.
+ *
+ * @author Dan Rhodes
+ * @ingroup glx_thumbnail_creator
+ */
+NONSHARABLE_CLASS( CGlxtnLoadThumbnailTask ) : public CGlxtnClientTask
+ {
+public:
+ /**
+ * Destructor.
+ */
+ ~CGlxtnLoadThumbnailTask();
+
+protected: // From CGlxtnTask
+ void DoCancel();
+
+protected:
+ /**
+ * C++ default constructor.
+ * @param aId Task type ID.
+ * @param aRequestInfo Parameters for the thumbnail request.
+ * @param aFileUtility File utility for use by the task.
+ * @param aClient Client initiating the request.
+ */
+ CGlxtnLoadThumbnailTask( const TGlxtnTaskId& aId,
+ const TGlxThumbnailRequest& aRequestInfo,
+ CGlxtnFileUtility& aFileUtility,
+ MGlxtnThumbnailCreatorClient& aClient );
+ /**
+ * Symbian 2nd phase constructor.
+ * @param aBitmapHandle Handle to bitmap in which to store the thumbnail.
+ */
+ void ConstructL( TInt aBitmapHandle );
+
+ /**
+ * Start asynchronous loading.
+ * @param aStatus Request status for the asynchronous operation.
+ * @return ETrue if an asynchronous operation has been started.
+ */
+ TBool LoadThumbnailL( TRequestStatus& aStatus );
+ /**
+ * Create bitmap from loaded thumbnail data.
+ * @param aStatus Request status for the asynchronous operation.
+ * @return ETrue if an asynchronous operation has been started.
+ */
+ TBool HandleLoadedThumbnailL( TRequestStatus& aStatus );
+ /**
+ * Start asynchronous decoding. iDecoder should point to a valid decoder.
+ * @param aStatus Request status for the asynchronous operation.
+ * @param aScaleBitmap If true, scale the loaded bitmap close to
+ * requested size.
+ */
+ void DecodeThumbnailL( TRequestStatus& aStatus, TBool aScaleBitmap );
+
+protected:
+ enum TGeneratorState
+ {
+ EStateFetchingUri, EStateLoading, EStateDecodingThumbnail,
+ EStateDecodingImage, EStateScaling, EStateFiltering
+ };
+
+ /** File utility */
+ CGlxtnFileUtility& iFileUtility;
+ /** Current state for task state machine */
+ TGeneratorState iState;
+ /** File information for item to thumbnail (owned) */
+ CGlxtnFileInfo* iInfo;
+ /** Requested thumbnail size */
+ TSize iRequestedSize;
+ /** Thumbnail image data (owned) */
+ HBufC8* iThumbData;
+ /** Thumbnail data format */
+ TGlxImageDataFormat iFormat;
+ /** Decoder to decode the thumbnail data (owned) */
+ CImageDecoder* iDecoder;
+ /** Bitmap to decode image into (owned) */
+ CFbsBitmap* iThumbnail;
+ /** DRM allowed flag passed from thumbnail request */
+ TBool iDrmAllowed;
+ };
+
+#endif // C_GLXTNLOADTHUMBNAILTASK_H