--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/photosgallery/viewframework/commandhandlers/commoncommandhandlers/inc/glxcommandhandlerback.h	Thu Dec 17 08:45:44 2009 +0200
@@ -0,0 +1,199 @@
+/*
+* 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:    Back command handler
+*
+*/
+
+
+
+
+#ifndef C_GLXCOMMANDHANDLERBACK_H
+#define C_GLXCOMMANDHANDLERBACK_H
+
+// INCLUDES
+#include <e32base.h>
+#include <glxcommandhandler.h>
+
+
+// FORWARD DECLARATION
+class MGlxMediaListProvider;
+class MMPXCollectionUtility;
+class MMPXViewUtility;
+class CGlxNavigationalState;
+
+  
+class CGlxBackServiceWrapper;
+
+class CAknAppUi;
+/**
+ * @class CGlxCommandHandlerBack
+ *
+ * Command handler that either takes you back to the previously
+ * active view or one step back in the UI hierarchy
+ *
+ */
+NONSHARABLE_CLASS (CGlxCommandHandlerBack)
+    : public CGlxCommandHandler
+	{
+private:
+
+	enum TGlxBackCommandId	
+    {
+    EGlxCmdBack,
+    EGlxCmdPreviousView,
+    EGlxCmdContainerPreviousView,
+    };
+
+public:
+
+	/**
+	 * Create Command handler for going back one step within the
+	 * UI Hierarchy
+	 * 
+	 * @param aMediaListProvider media list owner
+	 */
+	IMPORT_C static CGlxCommandHandlerBack* NewBackCommandHandlerL();
+	
+	/**
+	 * Create Command handler for going back one view when the
+	 * current view is outside UI Hierarchy
+	 * 
+	 * @param aMediaListProvider media list owner
+	 */							
+	IMPORT_C static CGlxCommandHandlerBack* NewPreviousViewCommandHandlerL( 	
+								MGlxMediaListProvider* aMediaListProvider = NULL);
+			    
+	/**
+	 * Create Command handler for checkig whether to go back one view or two view
+	 * when the current view is outside UI Hierarchy 
+	 * 
+	 * @param aMediaListProvider media list owner
+	 * @param aPrevViewId previous view id
+	 */							
+	IMPORT_C static CGlxCommandHandlerBack* NewContainerPreviousViewCommandHandlerL( 	
+								MGlxMediaListProvider* aMediaListProvider = NULL, 
+								TInt aPrevViewId = 0 );
+
+	/** Destructor */
+	IMPORT_C ~CGlxCommandHandlerBack();
+    
+private:
+
+    /**
+     * Two-phase constructor
+	 *
+	 * @param aCommandId Command id for command handler
+	 * @param aMediaListProvider media list owner
+	 * @param aPrevViewId previous view id
+	 */
+	static CGlxCommandHandlerBack* NewL(
+							TInt aCommandId, 
+							MGlxMediaListProvider* aMediaListProvider,
+							TInt aPrevViewId );
+	    
+    /** Second phase constructor */
+	void ConstructL(TBool aIsContainerList);
+
+    /** Constructor */
+	CGlxCommandHandlerBack(MGlxMediaListProvider* aMediaListProvider,
+							TInt aPrevViewId );
+     
+    // This API to be removed after testing with migration is over 
+	/**
+	 * check if deletion of container need to be checked
+	 */ 
+	// TBool CheckContainerDeletion() const;
+	
+public: // From MGlxCommandHandler
+
+	/**
+	 * Execute the command, if applicable
+	 * @param aCommand The command to handle
+	 * @return ETrue iff command was handled
+	 */
+	TBool ExecuteL( TInt aCommandId);
+
+	/**
+	 * Modify a menu before it is displayed.
+	 * @param aResourceId The resource ID of the menu
+	 * @param aMenuPane The in-memory representation of the menu pane
+	 */
+	void DynInitMenuPaneL(TInt aResourceId, CEikMenuPane* aMenuPane);
+	
+	/**
+	 * Called when the owning view is activated
+	 * @param aViewId The ID of the view
+	 */
+	void DoActivateL(TInt aViewId);
+
+	/**
+	 * Called when the owning view is deactivated
+	 */
+	void Deactivate();
+	
+	/**
+	 * Offers key events to the command handler
+	 * @param aKeyEvent The key event. 
+	 * @param aType The type of key event: EEventKey, EEventKeyUp or EEventKeyDown
+	 * @return Indicates whether or not the key event was used by this control. EKeyWasNotConsumed or EKeyWasConsumed
+	 */
+	TKeyResponse OfferKeyEventL(const TKeyEvent& aKeyEvent, TEventCode aType);
+
+	/**
+	 * Perform any actions needed before the options menu is displayed.
+	 * The view calling this must first arrange a wait dialog to be displayed, as this operation may take
+	 * a long time to complete
+	 */
+	void PreDynInitMenuPaneL( TInt aResourceId );
+	
+    /**
+     * See @ref MGlxCommandHandler::GetRequiredAttributesL
+     * No implementation required
+     */
+    void GetRequiredAttributesL(RArray< TMPXAttribute >& /*aAttributes*/,
+                                TBool /*aFilterUsingSelection*/,
+                                TBool /*aFilterUsingCommandId*/, 
+                                TInt /*aCommandId*/) const {}
+
+
+private: // data
+
+    /** Provider of media list */
+    MGlxMediaListProvider* iMediaListProvider;
+    
+    /** Back functionality that command handler need to execute */
+    TInt iCurrentCommandId;
+        
+    //Previous view id to be checked 
+    TInt iPrevViewId;
+    
+    // Navigational state is stored here
+    CGlxNavigationalState* iNavigationalState;
+   
+    CGlxBackServiceWrapper* iBSWrapper;
+    
+    //MMPXCollectionUtility* iCollectionUtility;
+
+    /**
+     * Check for the view activation and avoid previous view activation
+     * till the view activation is called on back
+     */
+    TBool iIsViewActivated;
+    
+    
+    /// The AppUI. Not owned
+    CAknAppUi* iAppUi;
+	};
+
+#endif // C_GLXCOMMANDHANDLERBACK_H