diff -r 41b775cdc0c8 -r 10c6e6d6e4d9 extras/calcsoft/inc/CalcHistory.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/extras/calcsoft/inc/CalcHistory.h	Wed Sep 01 12:29:54 2010 +0100
@@ -0,0 +1,107 @@
+/*
+* Copyright (c) 2002 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:  Define CCalcHistory class. This class is handled historical 
+*                line of Calculator. 
+*
+*/
+
+
+#ifndef     CALCHISTORY_H
+#define     CALCHISTORY_H
+
+//  INCLUDES
+#include   <e32base.h>
+
+//  CONSTANTS  
+const TInt KCalcMaxHistoryLines(100);
+
+//  FORWARD DECLARATIONS
+class TCalcEditLine;
+
+//  CLASS DEFINITIONS 
+
+/**
+CCalcHistory handles historical line of the calculator. 
+*/
+class   CCalcHistory :
+        public CBase
+    {
+    public:  // Constructors and destructor
+        /**
+        * C++ default constructor.
+        */
+        CCalcHistory();
+        
+        /**
+        * Destructor.
+        */
+        virtual ~CCalcHistory();
+        
+        
+    public:     // New functions
+        /**
+        * Return (aIndex + 1)th latest history line.
+        * @param aIndex  
+        * @return (aIndex + 1)th latest history line.
+        */
+        const TCalcEditLine& operator[](TInt aIndex);  
+        
+        /**
+        * Return count of historical lines. 
+        * @return Count of historical lines
+        */
+        TInt Count() const;
+        
+        /**
+        * Add newest history line
+        * @param aLine : added line  
+        */
+        void Add(const TCalcEditLine aLine); 
+
+        /**
+        * Clear calculation history.
+        */
+        void ClearHistory();
+
+        /**
+        * Notify changing decimal separator.
+        * @param aOld : Old decimal separator
+        * @param aNew : New decimal separator  
+        */
+        void NotifyChangeDecimal(TChar aOld, TChar aNew);
+        
+    private:    // New functions
+            
+    private:    // Data
+        //
+        //  historical data
+        //  Newest data index is iNewestIndex.
+        //  
+        //  <Case that iCount is smaller than KCalcMaxHistoryLines>
+        //    As data is older, index is smaller. The oldest dara index is zero.
+        //
+        //  <Case that iCount is KCalcMaxHistoryLines>
+        //    As data is older, index is smaller. But previous data index
+        //   to index zero is KCalcMaxHistoryLines-1. previous index to
+        //   KCalcMaxHistoryLines-1 is KCalcMaxHistoryLines-2. ..... 
+        //   Therefore the oldest data index is iNewestIndex+1.
+        //
+        TCalcEditLine iHistory[KCalcMaxHistoryLines]; // Calculation history
+        TInt      iCount;  // Valid historical lines
+        TInt      iNewestIndex;  // Index of newest history
+    };
+
+#endif      //  CALCHISTORY_H
+            
+// End of File