--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/idlehomescreen/inc/xnoomsyshandler.h Wed Sep 01 12:32:46 2010 +0100
@@ -0,0 +1,138 @@
+/*
+* 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,
+ EMem6MB = 6144000
+ };
+
+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