--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/photosgallery/viewframework/medialists/inc/glxattributecontext.h	Thu Dec 17 08:45:44 2009 +0200
@@ -0,0 +1,151 @@
+/*
+* 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:    Generic fetch context to retrieve attributes
+*
+*/
+
+
+
+
+#ifndef C_GLXATTRIBUTECONTEXT_H
+#define C_GLXATTRIBUTECONTEXT_H
+
+#include <e32std.h>
+#include "mglxfetchcontext.h"
+#include "glxmedialistiterator.h"	// for TGlxSequentialIterator
+
+// Forward declarations
+class MGlxMediaList;
+class TMPXAttribute;
+class T_CGlxAttributeContext; // For E-unit only
+
+/**
+ *  CGlxAttributeContext
+ *
+ *  Fetch context to retrieve thumbnails
+ *
+ *  @lib glxmedialists.lib
+ */
+class CGlxAttributeContext : public CBase, public MGlxFetchContext
+	{
+public:
+	/**
+	 * Constructor
+	 * @param aIterator Iterator that determines the order of attribute 
+	 *  	  retrieval and for which items attributes are and are not retrieved
+	 */
+	IMPORT_C CGlxAttributeContext(MGlxMediaListIterator* aIterator);
+	IMPORT_C ~CGlxAttributeContext();
+
+	/**
+	 * Adds an attribute to be retrieved for all items
+	 * @param aAttribute The attribute to be retrieved
+	 */
+	IMPORT_C void AddAttributeL(const TMPXAttribute& aAttribute);
+
+	/**
+	 * Removes an attribute from the "retrieval instructions"
+	 * @param aAttribute The attribute to be removed 
+	 */
+	IMPORT_C void RemoveAttribute(const TMPXAttribute& aAttribute);
+
+	/**
+	 * Returns the count of the attributes to be retrieved
+	 * @return the count of the attribtues to be retrieved
+	 */
+	IMPORT_C TInt AttributeCount();
+	
+	/**
+	 * Sets granularity of the item index array returned from AttributeRequestL
+	 */
+	IMPORT_C void SetGranularity(TUint aGranularity);
+
+public: // From MGlxFetchContext
+    /// See @ref MGlxFetchContext::AttributeRequestL
+    TInt AttributeRequestL(const MGlxMediaList* aList, RArray<TInt>& aItemIndices, 
+    	RArray<TMPXAttribute>& aAttributes, CMPXAttributeSpecs*& aDetailedSpecs) const;
+
+    /// See @ref MGlxFetchContext::AllAttributesL
+    void AllAttributesL(const MGlxMediaList* aList, TInt aListIndex, 
+    	RArray<TMPXAttribute>& aAttributes) const;
+
+    /// See @ref MGlxFetchContext::RequestCountL
+    TInt RequestCountL(const MGlxMediaList* aList) const;
+    	
+private:
+	/**
+	 * Determine attributes to request for an item
+	 * @param aIndexInList item index in media list
+	 * @param aList media list
+	 * @param aAttributes requested attributes
+	 * @return ETrue if attributes to be requested, otherwise EFalse
+	 */
+	TBool AddItemAttributesL(TInt aIndexInList, const MGlxMediaList* aList, RArray<TMPXAttribute>& aAttributes, 
+	                         TInt& aError, TBool aFirstItem) const;
+
+	/**
+	 * Append attribute to array, no duplicates
+	 * @param aAttributes requested attributes
+	 * @param aAttribute attribute to be added
+	 */
+	void AddItemAttributeL(RArray<TMPXAttribute>& aAttributes, const TMPXAttribute& aAttribute) const;
+	
+private:
+	/** Attributes to be requested for all items */
+	RArray<TMPXAttribute> iAttributes;
+	
+	/**
+	 * Iterator for traversing the list
+	 */
+	MGlxMediaListIterator* iIterator;	
+	
+	/** 
+	 * Granularity of the item index array returned from AttributeRequestL
+	 */
+	TUint iGranularity;
+
+	/** Tester class */
+	friend class T_CGlxAttributeContext;
+	};
+	
+/**
+ *  CGlxDefaultAttributeContext
+ *
+ *  Fetch context to retrieve MPX attributes starting from focus outward
+ *
+ *  @lib glxmedialists.lib
+ */
+class CGlxDefaultAttributeContext : public CGlxAttributeContext
+	{
+public:
+	IMPORT_C static CGlxDefaultAttributeContext* NewL();
+	IMPORT_C ~CGlxDefaultAttributeContext();
+
+	/**
+	 * Set the range offsets. These determine the outer limits
+	 * of attributes to be retrieved, compared to current focus in
+	 * the list
+	 * If ranges not defined, retrieves the attributes for focused item only
+	 */
+    IMPORT_C void SetRangeOffsets(TInt aFrontOffset, TInt aRearOffset);
+
+private:
+	CGlxDefaultAttributeContext();
+
+private:
+	TGlxFromFocusOutwardIterator iFromFocusIterator;	
+	};
+	
+#endif // C_GLXATTRIBUTECONTEXT_H
+