--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/photosgallery/viewframework/medialists/inc/mglxfetchcontext.h Thu Dec 17 08:45:44 2009 +0200
@@ -0,0 +1,84 @@
+/*
+* Copyright (c) 2008-2009 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: Media and attribute fetch context
+*
+*/
+
+
+
+
+#ifndef M_GLXFETCHCONTEXT_H
+#define M_GLXFETCHCONTEXT_H
+
+#include <e32base.h>
+#include "glxmediaid.h"
+
+#include <mpxattributespecs.h>
+
+class MGlxMediaList;
+class TMPXAttribute;
+
+/**
+ * MGlxFetchContext
+ *
+ * Interface that allows clients to define which media items should be
+ * retrieved and which properties for them
+ *
+ * @lib none
+ */
+class MGlxFetchContext
+ {
+public:
+ /**
+ * Specifies which attributes should be fetched for a particular item
+ * in the list.
+ * @param aList the list for which the request relates to
+ * @return in aItemIndices the list indices for which the attributes should be requested for
+ * if no items requiring attributes, returns an empty array.
+ * Caller should make sure the array is empty before calling.
+ * @return in aAttributes the attributes that should be retrieved
+ * @return in aDetailedSpecs a new detailed specification object
+ * regarding the attributes or NULL. Caller must set the
+ * parameter to NULL.
+ * @return TInt number of items with outstanding requests.
+ * KErrGeneral if there are no more requests but there are outstanding errors.
+ */
+ virtual TInt AttributeRequestL(const MGlxMediaList* aList, RArray<TInt>& aItemIndices,
+ RArray<TMPXAttribute>& aAttributes, CMPXAttributeSpecs*& aDetailedSpecs) const = 0;
+
+ /**
+ * Lists all attributes that a required for a particular item in the list.
+ * Ignores whether the attributes have been loaded or not. This function
+ * is used for garbage collection, in order to know if an attribute is
+ * still in use.
+ * @param aList the list for which the call relates to
+ * @param aListIndex the index in the list of the particular item
+ * @return in aAttributes all attributes that this context requires.
+ * if no attributes are required, returns the array as empty.
+ * Caller must make sure the array is empty before calling.
+ */
+ virtual void AllAttributesL(const MGlxMediaList* aList, TInt aListIndex,
+ RArray<TMPXAttribute>& aAttributes) const = 0;
+
+ /**
+ * Provides the number of items with currently outstanding requests
+ *
+ * @param aList the list for which the call relates to
+ * @return TInt number of items with outstanding requests.
+ * KErrGeneral if there are no more requests but there are outstanding errors.
+ */
+ virtual TInt RequestCountL(const MGlxMediaList* aList) const = 0;
+ };
+
+#endif // M_GLXFETCHCONTEXT_H
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