/*

* 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 the calculator. 

*

*/

// INCLUDE FILES

#include "CalcEditline.h" 

#include "CalcHistory.h" 

//  LOCAL CONSTANTS AND MACROS  

// ================= MEMBER FUNCTIONS =======================

// C++ default constructor can NOT contain any code, that

// might leave.

//

CCalcHistory::CCalcHistory():

              iNewestIndex(KCalcMaxHistoryLines - 1)

    {

    iHistory[iNewestIndex].AllClear();

    }

// Destructor

CCalcHistory::~CCalcHistory()

    {

    }

// Assignment operator

// This inplementation depends on how to have history data. 

// Refer to description of member data, CCalcHistory.h 

// 

const TCalcEditLine& CCalcHistory::operator[]

                       (TInt aIndex) // Get (aIndex + 1)th latest history line 

    {

    TInt lineIndex(iNewestIndex - aIndex);

    if ( lineIndex < 0 )

        {

        lineIndex += KCalcMaxHistoryLines;

        }

    return iHistory[lineIndex];      

    }

// ---------------------------------------------------------

// CCalcHistory::Count

// Return count of histoical lines.

// (other items were commented in a header).

// ---------------------------------------------------------

//

TInt CCalcHistory::Count() const     

    {

    return iCount;

    }

// ---------------------------------------------------------

// CCalcHistory::Add

// This inplementation depends on how to have history data. 

// Refer to description of member data, CCalcHistory.h 

// (other items were commented in a header).

// ---------------------------------------------------------

//

void CCalcHistory::Add

                (const TCalcEditLine aLine) 

    {

    if ( iNewestIndex == (KCalcMaxHistoryLines - 1) )

        {

        iNewestIndex = 0;

        }

    else

        {

        iNewestIndex++;

        }

    if ( iCount < KCalcMaxHistoryLines )

        {

        iCount++;

        }

    iHistory[iNewestIndex] = aLine;

    }

// ---------------------------------------------------------

// CCalcHistory::ClearHistory

// Clear calculation history.

// (other items were commented in a header).

// ---------------------------------------------------------

//

void CCalcHistory::ClearHistory()

    {

    iCount = 0;

    iNewestIndex = KCalcMaxHistoryLines - 1;

    for (TInt cnt(0); cnt < KCalcMaxHistoryLines; cnt++)

        {

        iHistory[cnt].AllClear();

        }

    }

// ---------------------------------------------------------

// CCalcHistory::NotifyChangeDecimal

// Call when decimal separator is changed.

// (other items were commented in a header).

// ---------------------------------------------------------

//

void CCalcHistory::NotifyChangeDecimal(TChar aOld, TChar aNew)

    {

    for (TInt cnt(0); cnt < iCount; cnt++)

        {

        iHistory[cnt].ChangeDecimal(aOld, aNew);

        }

    }

// End of File