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: Document class, CCalcDocument |
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15 * Derived from CEikDocument |
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16 * The history of inputted data is held. |
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17 * The memory of four-arithmetical-operations operation |
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18 * or a calculation result is held. |
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19 * The last result and memory are saved at a file and |
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20 * it restores. |
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21 * |
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22 */ |
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23 |
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24 |
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25 #ifndef CALCDOC_H |
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26 #define CALCDOC_H |
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27 |
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28 |
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29 // INCLUDES |
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30 #include <eikdoc.h> |
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31 |
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32 #include "CalcEditline.h" |
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33 |
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34 #include "CalcView.h" |
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35 // CONSTANTS |
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36 const TInt KCalcErrEditorSpaceFull(-10000); |
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37 |
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38 // FORWARD DECLARATIONS |
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39 |
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40 class CEikAppUi; |
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41 class CCalcHistory; |
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42 class CCalcAppEnv; |
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43 |
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44 // CLASS DEFINITIONS |
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45 |
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46 /** |
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47 CCalcDocument : 'Document' class |
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48 */ |
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49 class CCalcDocument |
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50 :public CEikDocument |
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51 { |
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52 public: // Constructors and destructor |
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53 /** |
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54 * Two-phased constructor. |
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55 * @param aApp : Reference of CEikApplication class |
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56 */ |
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57 static CCalcDocument* NewL(CEikApplication& aApp); |
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58 |
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59 /** |
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60 * Destructor. |
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61 */ |
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62 virtual ~CCalcDocument(); |
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63 |
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64 |
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65 public: // New functions |
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66 /** |
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67 * Set the pointer to CalcAppEnv. |
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68 */ |
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69 void SetAppEnv(CCalcAppEnv* aCalcAppEnv); |
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70 |
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71 /** |
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72 * Set the pointer to CalcAppEnv. |
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73 */ |
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74 void SetCalcView( CCalcView* aCCalcView ); |
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75 |
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76 /** |
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77 * Make calculation, and add result to calcluation history. |
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78 * Leave may occur, causes KErrOverflow or KErrDivideByZero or KErrNotSupported (negative value with square root). |
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79 * @param aOperand : operand. |
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80 * @param aLine : inputted edit line |
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81 * @return TReal64: Provisional result. |
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82 */ |
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83 TReal64 CalculateAndAddHistoryL( |
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84 TReal64 aOperand, |
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85 const TCalcEditLine& aLine); |
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86 |
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87 /** |
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88 * Make calculation, nothing is added to the calculation history. |
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89 * Leave may occur, causes KErrOverflow or KErrDivideByZero or KErrNotSupported (negative value with square root). |
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90 * @param aOperand : operand. |
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91 * @param aLine : inputted edit line |
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92 * @return TReal64: Provisional result. |
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93 */ |
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94 TReal64 CalculateAndNoHistoryL( |
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95 TReal64 aOperand, |
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96 const TCalcEditLine& aLine); |
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97 |
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98 /** |
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99 * Make calculation, and modify the operator |
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100 * before adding anything to the calculation history. |
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101 * Leave may occur, causes KErrOverflow or KErrDivideByZero or KErrNotSupported (negative value with square root). |
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102 * @param aOperand : operand. |
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103 * @param aLine : inputted edit line |
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104 * @return TReal64: Provisional result. |
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105 */ |
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106 TReal64 CalculateAndModifyHistoryL( |
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107 TReal64 aOperand, |
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108 TCalcEditLine& aLine, |
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109 TCalcEditLine::TCalcOperatorType aOperator); |
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110 |
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111 /** |
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112 * Add a line which is "= (provisional result)" to calculation history. |
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113 * And Last Result is updated to provisional result |
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114 */ |
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115 void AddEqualLineAndUpdateLastResultL(); |
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116 |
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117 /** |
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118 * Empty line is added to calculation history. |
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119 */ |
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120 void AddEmptyLine(); |
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121 |
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122 /** |
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123 * Memory is saved. |
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124 * @param aNewMemory : New memory, current operand. |
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125 */ |
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126 void MemorySaveL(TReal64 aNewMemory); |
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127 |
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128 /** |
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129 * Memory is saved. |
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130 * @param aLine : Current value of editor |
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131 */ |
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132 TBool HasMemory() const; |
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133 |
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134 /** |
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135 * Return current memory. |
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136 * @return TReal64 : current memory. |
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137 */ |
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138 TReal64 Memory() const; |
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139 |
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140 /** |
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141 * Clear memory. |
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142 */ |
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143 void MemoryClearL(); |
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144 |
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145 /** |
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146 * Return last result |
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147 * @param TReal64 : Last result. |
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148 */ |
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149 TReal64 LastResult() const; |
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150 |
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151 /** |
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152 * Return provisional result |
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153 * @param aLine : For getting provisional result. |
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154 */ |
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155 TReal64 ProvisionalResult() const; |
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156 |
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157 /** |
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158 * Return pointer of CCalcHistory class. |
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159 * @return Pointer of CCalcHistory class |
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160 */ |
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161 CCalcHistory* History() const; |
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162 |
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163 /** |
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164 * Restore memory and last result |
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165 */ |
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166 void LoadStateL(); |
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167 |
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168 /** |
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169 * Store memory and last result |
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170 */ |
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171 void SaveStateL(); |
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172 |
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173 private: // New functions |
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174 /** |
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175 * By default constructor is private. |
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176 * @param aApp: Reference of CEikApplication class |
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177 */ |
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178 CCalcDocument(CEikApplication& aApp); |
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179 |
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180 /** |
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181 * Second-phase constructor |
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182 */ |
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183 void ConstructL(); |
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184 |
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185 /** |
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186 * Make calculation by using argument aLine |
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187 * Leave may occur, causes KErrOverflow or KErrDivideByZero. |
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188 * @param aOperand : operand |
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189 * @param aOperator : Operator type enum. |
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190 * @return Result of calculation |
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191 */ |
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192 TReal64 CalculateL(TReal64 aOperand, |
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193 TCalcEditLine::TCalcOperatorType aOperator); |
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194 |
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195 /** |
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196 * Check overflow and underflow |
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197 * Leave may occur, causes KErrOverflow |
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198 * @param aResult : result of calculation |
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199 */ |
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200 void CheckResultL(TReal64* aResult); |
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201 |
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202 /** |
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203 * Write last result and memory to document file. |
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204 * @param aStream : Interface of write steam |
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205 */ |
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206 void ExternalizeL(RWriteStream& aStream) const; |
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207 |
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208 /** |
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209 * Read last result and memory from document file. |
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210 * @param aStream : Interface of read steam |
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211 */ |
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212 void InternalizeL(RReadStream& aStream); |
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213 |
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214 |
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215 private: // Functions from base classes |
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216 /** |
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217 * From CEikDocument : Create CCalcAppUi object |
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218 */ |
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219 CEikAppUi* CreateAppUiL(); |
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220 |
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221 private: // Data |
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222 CCalcAppEnv* iCalcAppEnv; // Not own |
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223 TReal64 iProvisionalResult; // Provisional result |
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224 TReal64 iMemory; // Memory |
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225 TReal64 iLastResult; // Last result |
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226 CCalcHistory* iHistory; // History |
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227 CCalcView* iCCalcView; // Not own |
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228 }; |
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229 |
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230 #endif // CALCDOC_H |
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231 |
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232 // End of File |
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233 |
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