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1 /* |
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2 * Copyright (c) 2002 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0"" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: Define CCalcHistory class. This class is handled historical |
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15 * line of Calculator. |
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16 * |
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17 */ |
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18 |
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19 |
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20 #ifndef CALCHISTORY_H |
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21 #define CALCHISTORY_H |
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22 |
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23 // INCLUDES |
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24 #include <e32base.h> |
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25 |
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26 // CONSTANTS |
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27 const TInt KCalcMaxHistoryLines(100); |
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28 |
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29 // FORWARD DECLARATIONS |
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30 class TCalcEditLine; |
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31 |
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32 // CLASS DEFINITIONS |
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33 |
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34 /** |
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35 CCalcHistory handles historical line of the calculator. |
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36 */ |
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37 class CCalcHistory : |
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38 public CBase |
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39 { |
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40 public: // Constructors and destructor |
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41 /** |
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42 * C++ default constructor. |
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43 */ |
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44 CCalcHistory(); |
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45 |
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46 /** |
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47 * Destructor. |
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48 */ |
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49 virtual ~CCalcHistory(); |
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50 |
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51 |
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52 public: // New functions |
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53 /** |
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54 * Return (aIndex + 1)th latest history line. |
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55 * @param aIndex |
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56 * @return (aIndex + 1)th latest history line. |
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57 */ |
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58 const TCalcEditLine& operator[](TInt aIndex); |
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59 |
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60 /** |
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61 * Return count of historical lines. |
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62 * @return Count of historical lines |
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63 */ |
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64 TInt Count() const; |
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65 |
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66 /** |
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67 * Add newest history line |
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68 * @param aLine : added line |
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69 */ |
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70 void Add(const TCalcEditLine aLine); |
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71 |
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72 /** |
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73 * Clear calculation history. |
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74 */ |
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75 void ClearHistory(); |
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76 |
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77 /** |
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78 * Notify changing decimal separator. |
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79 * @param aOld : Old decimal separator |
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80 * @param aNew : New decimal separator |
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81 */ |
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82 void NotifyChangeDecimal(TChar aOld, TChar aNew); |
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83 |
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84 private: // New functions |
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85 |
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86 private: // Data |
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87 // |
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88 // historical data |
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89 // Newest data index is iNewestIndex. |
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90 // |
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91 // <Case that iCount is smaller than KCalcMaxHistoryLines> |
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92 // As data is older, index is smaller. The oldest dara index is zero. |
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93 // |
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94 // <Case that iCount is KCalcMaxHistoryLines> |
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95 // As data is older, index is smaller. But previous data index |
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96 // to index zero is KCalcMaxHistoryLines-1. previous index to |
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97 // KCalcMaxHistoryLines-1 is KCalcMaxHistoryLines-2. ..... |
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98 // Therefore the oldest data index is iNewestIndex+1. |
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99 // |
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100 TCalcEditLine iHistory[KCalcMaxHistoryLines]; // Calculation history |
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101 TInt iCount; // Valid historical lines |
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102 TInt iNewestIndex; // Index of newest history |
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103 }; |
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104 |
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105 #endif // CALCHISTORY_H |
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106 |
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107 // End of File |