diff -r 000000000000 -r 4e91876724a2 photosgallery/commonui/inc/glxnavigationalstate.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/photosgallery/commonui/inc/glxnavigationalstate.h	Thu Dec 17 08:45:44 2009 +0200
@@ -0,0 +1,135 @@
+/*
+* 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:    Navigational state of the app
+*
+*/
+
+
+
+
+#ifndef __C_GLXNAVIGATIONALSTATE_H__
+#define __C_GLXNAVIGATIONALSTATE_H__
+
+#include <e32std.h>
+
+#include <glxmediaid.h>
+#include <vwsdef.h>
+#include <glxnavigationalstatedefs.h>
+
+class CGlxNavigationalStateImp;
+class CMPXCollectionPath;
+class MGlxNavigationalStateObserver;
+
+/**
+ * CGlxNavigationalState
+ *
+ * Class that stores the navigational state of the application.
+ * Navigational state means the currently viewed node in UI hierarchy
+ *
+ * Design: CGlxNavigationalState delegates all operations to 
+ * CGlxNavigationalStateImp, to avoid client having to include mpx dependencies.
+ * CGlxNavigationalStateImp stores the navigational state in MPX collection 
+ * server by owning an MMPXCollectionUtility. 
+ * 
+ * @author Aki Vanhatalo
+ */
+class CGlxNavigationalState : public CBase
+    {
+private:
+
+public:
+    /**
+     * Return a (singleton) instance of the class
+     * Close the instance by calling Close() when done with the instance
+     */
+    IMPORT_C static CGlxNavigationalState* InstanceL(); 
+    
+    /**
+     * Close the instance and remove observer if any
+     * See @ref MGlxActiveMediaListResolver::Close
+     * @param aObserver Observer to remove
+     */
+    IMPORT_C void Close();
+    
+    /**
+     * Add an observer
+     * @param aObserver Observer of changes to the state
+     */
+    IMPORT_C void AddObserverL( MGlxNavigationalStateObserver& aObserver );
+    
+    /**
+     * Remove an observer
+     * @param aObserver Observer to remove. 
+     */
+    IMPORT_C void RemoveObserver( MGlxNavigationalStateObserver& aObserver );
+
+    /**
+     * @return the current navigational state. Caller gets ownership.
+     */
+    IMPORT_C CMPXCollectionPath* StateLC() const;
+    
+    /**
+     * Navigate back in the UI hierarchy
+     * Does nothing, if currently at root.
+     */
+    IMPORT_C void NavigateToParentL();
+    
+    /**
+     * Navigate forward to provided item
+     * @param aItemToOpen Id of item to navigate to
+     */
+    IMPORT_C void NavigateToChildL( const TGlxMediaId& aItemIdToOpen );
+    
+    /**
+     * Navigate to provided position in hierarchy
+     * @param aNewState Path object which describes the new position in hierarchy
+     */
+    IMPORT_C void NavigateToL( const CMPXCollectionPath& aNewState );
+
+     /**
+     * Activate previous view
+     */
+    IMPORT_C void ActivatePreviousViewL();
+     
+     /**
+     * returns the current viewing mode of the application
+     */
+     IMPORT_C NGlxNavigationalState::TViewingMode ViewingMode();
+     
+     /**
+     * Sets the mode to "view"
+     */
+     IMPORT_C void SetToViewMode();
+
+     IMPORT_C void SetBackExitStatus(TBool aStatus);
+     
+     IMPORT_C TBool BackExitStatus();
+  
+private:
+    /** Constructor for singleton store */
+    static CGlxNavigationalState* NewL();
+    
+    /** Destructor */
+    ~CGlxNavigationalState();
+
+private:
+    /// Implementation 
+    CGlxNavigationalStateImp* iImp;
+    
+public:
+    TBool iBackExitStatus;
+    };
+    
+    
+#endif // __C_GLXNAVIGATIONALSTATE_H__
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