--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/idlehomescreen/inc/xnoomsyshandler.h	Thu Dec 17 08:40:49 2009 +0200
@@ -0,0 +1,137 @@
+/*
+* Copyright (c) 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:
+* Helper system for handling Out-Of-Memory cases.
+*
+*/
+
+#ifndef XNOOMSYSHANDLER_H
+#define XNOOMSYSHANDLER_H
+
+// System includes
+#include <e32base.h>
+
+// Forward declarations
+
+// Macros
+
+// Bytes to kilobytes
+#define B2KB(val_in_bytes) (TInt)( val_in_bytes / 1024 )
+// Kilobytes to bytes 
+#define KB2B(val_in_kbytes) (TInt)( val_in_kbytes * 1024 )
+
+#define WIDGET_MIN_MEM  CXnOomSysHandler::EMem1MB
+#define VIEW_MIN_MEM    CXnOomSysHandler::EMem4MB
+
+/**
+ *  Class helper for handling (and preventing) out-of-memory failures
+ *
+ *  This Class has only some static method. 
+ *  E.g. for showing error popup window or for checking of available memory on
+ *  the heap. etc.
+ *
+ *  @ingroup group_xnlayoutengine
+ *  @lib xn3layoutengine.lib
+ *  @since S60 5.0
+ */
+NONSHARABLE_CLASS( CXnOomSysHandler ) : public CBase
+    {
+public:     // data types
+
+    /**
+     * Enumeration of predefined values of memory amount for possible use 
+     */
+    enum TMemPredefinedValues
+        {
+#ifdef _DEBUG
+        EMemOutOfRangeTest = 209715200,
+#endif
+        EMinNotDef = 0,
+        EMem1kB = 1024,
+        EMem2kB = 2048,
+        EMem4kB = 4096,
+        EMem8kB = 8192,
+        EMem16kB = 16384,
+        EMem32kB = 32768,
+        EMem64kB = 65536,
+        EMem128kB = 131072,
+        EMem256kB = 262144,
+        EMem512kB = 524288,
+        EMem1MB = 1024000,
+        EMem2MB = 2048000,
+        EMem3MB = 3072000,
+        EMem4MB = 4096000
+        };
+
+public: // Construction / destruction.
+    /**
+     * Two-phased constructor.
+     */
+    static CXnOomSysHandler* NewL();
+
+    /**
+     * Destructor.
+     */
+    virtual ~CXnOomSysHandler();
+    
+public: // methods.
+    /**
+     * Checks if required amount of free memory is available on heap.
+     * 
+     * @param aAmount required amount of free memory (in Bytes - use some 
+     * value from TMemPredefinedValues enumeration for your comfort)
+     * @return ETrue if required memory is available on heap, otherwise EFalse
+     */
+    static TBool HeapAvailable( TInt aAmount = EMinNotDef );
+
+    /**
+     * Handle potential OOM failure.
+     */
+    void HandlePotentialOomL();
+
+private: // Constructors.
+    /**
+     * Symbian 2nd phase constructor.
+     */
+    void ConstructL();   
+    
+    /**
+     * C++ constructor.
+     */
+    CXnOomSysHandler();
+    
+private:     // functions
+    /**
+     * Check whether OOM dialog can be shown.
+     * Prevents OOM dialogs popping up more often than
+     * defined in KMinInterval (defined in .cpp).
+     */
+    TBool AllowDialog();
+    
+private:    // Data.    
+    /**
+     * OOM dialog message.
+     * 
+     * Allocated early because memory might not
+     * be available when HandlePotentialOomL is called.
+    */
+    HBufC* iMsg;    
+    
+    /**
+     * Stored time stamp representing when dialog was last shown.
+    */
+    TInt64 iPreviousDialogPopupTime;
+    };
+
+#endif // XNOOMSYSHANDLER_H