--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/photosgallery/slideshow/engine/coresrc/shwthumbnailloader.h Thu Dec 17 08:45:44 2009 +0200
@@ -0,0 +1,124 @@
+/*
+* Copyright (c) 2007-2008 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: Utility that handles thumbnail loading
+ *
+*/
+
+
+
+
+#ifndef __CSHWTHUMBNAILLOADER_H__
+#define __CSHWTHUMBNAILLOADER_H__
+
+// INCLUDES
+#include <e32std.h>
+#include <e32base.h>
+
+// FORWARD DECLARATIONS
+class MGlxMediaList;
+
+// CLASS DECLARATIONS
+
+/**
+ * MShwThumbnailLoadObserver
+ * Interface to handle errors in thumbnail loading
+ * for the slide show
+ */
+NONSHARABLE_CLASS( MShwThumbnailLoadObserver )
+ {
+ public:
+
+ /**
+ * This method gets called when given thumbnail is loaded
+ * @param aIndex the index for which thumbnail is loaded
+ */
+ virtual void HandleThumbnailLoadedL( TInt aIndex ) = 0;
+
+ /**
+ * This method gets called when thumbnail loading
+ * fails for a given index
+ * @param aIndex the index for which thumbnail load fails
+ */
+ virtual void HandleThumbnailLoadFailureL( TInt aIndex ) = 0;
+
+ /**
+ * This method gets called when the media list
+ * becomes empty
+ */
+ virtual void HandleMediaListEmpty() = 0;
+
+ };
+
+/**
+ * CShwThumbnailLoader
+ * Class to handle proper thumbnail loading and image size retrieval
+ * for the slide show
+ * @lib shwslideshowengine.lib
+ */
+NONSHARABLE_CLASS( CShwThumbnailLoader )
+ : public CBase
+ {
+ public: // Constructors and destructor
+
+ /**
+ * Constructor.
+ * @param aMedialist used for thumbnail loading
+ */
+ static CShwThumbnailLoader* NewL(
+ MGlxMediaList& aMedialist,
+ MShwThumbnailLoadObserver& aErrorHandler );
+
+ /**
+ * Destructor.
+ */
+ ~CShwThumbnailLoader();
+
+ public: // the API
+
+ /**
+ * This method is used to load a thumbnail and get a callback once it
+ * is loaded. Note! This method is always asynchronous.
+ * @param aIndex the index
+ * @param aSize the thumbnail size
+ */
+ void LoadAndNotifyL( TInt aIndex, TSize aSize );
+
+ /**
+ * This method is used to unload a thumbnail
+ * @param aIndex the index
+ */
+ void Unload( TInt aIndex );
+
+ /**
+ * This method retrieves the size of an image for a given index.
+ * It is the caller's responsibility to give a valid index!
+ * If the imagesize is not yet loaded the method returns
+ * TSize( KErrNotFound, KErrNotFound );
+ * @param aIndex the index
+ * @return the size of the image
+ */
+ TSize ImageSizeL( TInt aIndex );
+
+ private: // Data & Implementation
+
+ /// C++ constructor, no derivation intended
+ CShwThumbnailLoader();
+
+ /// Own: The implementation details
+ class CShwThumbnailLoaderImpl;
+ CShwThumbnailLoaderImpl* iImpl;
+
+ };
+
+#endif // __CSHWTHUMBNAILLOADER_H__