--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/photosgallery/viewframework/uiutilities/inc/glxactivemedialistregistry.h	Thu Dec 17 08:45:44 2009 +0200
@@ -0,0 +1,120 @@
+/*
+* 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:    Class that stores the active media list pointer
+*
+*/
+
+
+
+ 
+#ifndef __C_GLXACTIVEMEDIALISTREGISTRY_H__
+#define __C_GLXACTIVEMEDIALISTREGISTRY_H__
+
+#include <e32std.h>
+#include <e32base.h>
+
+#include "mglxactivemedialistresolver.h"
+
+class MGlxMediaList;
+class MGlxActiveMediaListChangeObserver;
+
+/**
+ * Class to store the active media list
+ */
+NONSHARABLE_CLASS( CGlxActiveMediaListRegistry ) : public CBase, public MGlxActiveMediaListResolver
+    {
+public:
+    /**
+     * Return a (singleton) instance of the interface
+     * Close the instance by calling Close() when done with the instance
+     * @param aObserver Observer to add
+     */
+    IMPORT_C static CGlxActiveMediaListRegistry* InstanceL(
+        MGlxActiveMediaListChangeObserver* aObserver = NULL); 
+    
+    /**
+     * Close the instance and remove observer if any
+     * See @ref MGlxActiveMediaListResolver::Close
+     * @param aObserver Observer to remove
+     */
+    void Close(MGlxActiveMediaListChangeObserver* aObserver = NULL);
+
+    /**
+     * Registers a media list as being active
+     * Calls MGlxActiveMediaListChangeObserver::HandleActiveMediaListChanged
+     * @param aMediaList list to register as active 
+     */
+    IMPORT_C void RegisterActiveMediaList(MGlxMediaList* aMediaList);
+
+    /**
+     * Deregisters a media list that has previously registerd as active
+     * Takes a pointer to the media list, so that implementation can 
+     * know if the deregistration refers to a list that has been registered 
+     * before the currenlty active list has been registered.
+     * The background is that the DoDeactivateL of the previous view
+     * is called after the DoActivateL of the new view.
+     * Note: This must be called while the media list is still alive,
+     * i.e., not closed!
+     * If no other media list has been registered, the currently active
+     * media list will be set to NULL.
+     * Calls MGlxActiveMediaListChangeObserver::HandleActiveMediaListChanged
+     * @param aMediaList list to deregister as active
+     */
+    IMPORT_C void DeregisterActiveMediaList(MGlxMediaList* aMediaList);
+
+    /** 
+     * See @ref MGlxActiveMediaListResolver::ActiveMediaList
+     * @return the active media list
+     */
+    MGlxMediaList* ActiveMediaList() const;
+
+private:
+    /**
+     * Constructor 
+     */
+    CGlxActiveMediaListRegistry();
+
+    /** 
+     * Destructor 
+     */
+    ~CGlxActiveMediaListRegistry();
+    
+    /** 
+     * Notify observers of change to the list pointer
+     */
+    void NotifyObservers();
+
+    /**
+     * 2-phase constructor
+     */
+    static CGlxActiveMediaListRegistry* NewL();
+
+private:
+    /** 
+     * The list in the currently open view that the user is navigating, or 
+     * NULL if that media list is not known 
+     */    
+    MGlxMediaList* iActiveMediaList;
+    
+    /** 
+     * True if two views have registered the currently active list 
+     * Allows the current and previous view to register the same list
+     */
+    TBool iRegisteredTwice;
+    
+    /** List of observers */
+    RPointerArray<MGlxActiveMediaListChangeObserver> iObservers;
+    };     
+    
+#endif // __C_GLXACTIVEMEDIALISTREGISTRY_H__
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