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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: 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 |
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26 // INCLUDE FILES |
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27 #include "CalcDoc.h" |
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28 #include "CalcEditline.h" |
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29 #include "CalcAppUi.h" |
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30 #include "CalcApp.h" |
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31 #include "CalcEnv.h" |
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32 #include "CalcHistory.h" |
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33 #include "e32math.h" |
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34 #include <e32cmn.h> |
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35 #include <s32file.h> |
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36 // CONSTANTS |
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37 const TReal64 KCalcDefaultMemory(0.0); |
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38 const TReal64 KCalcDefaultLastResult(0.0); |
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39 const TReal64 KCalcDefaultZero(1E-12); |
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40 |
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41 _LIT( KCalculatorFilename,"Calcsoft.ini"); |
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42 _LIT(KDelimiter, ":"); |
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43 |
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44 // ================= MEMBER FUNCTIONS ======================= |
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45 |
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46 // Two-phased constructor. |
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47 CCalcDocument* CCalcDocument::NewL |
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48 (CEikApplication& aApp) |
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49 { |
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50 CCalcDocument* self = new (ELeave) CCalcDocument(aApp); |
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51 CleanupStack::PushL(self); |
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52 self->ConstructL(); |
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53 CleanupStack::Pop(self); |
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54 return self; |
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55 } |
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56 |
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57 // Destructor |
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58 CCalcDocument::~CCalcDocument() |
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59 { |
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60 delete iHistory; |
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61 } |
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62 |
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63 // --------------------------------------------------------- |
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64 // CCalcDocument::CalculateAndAddHistoryL |
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65 // This function is called when State is changed to State3 or State5. |
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66 // (other items were commented in a header). |
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67 // --------------------------------------------------------- |
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68 // |
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69 TReal64 CCalcDocument::CalculateAndAddHistoryL |
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70 (TReal64 aOperand, |
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71 const TCalcEditLine& aLine) |
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72 { |
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73 iProvisionalResult = CalculateL(aOperand, aLine.Operator()); |
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74 iHistory->Add(aLine); // Add a line to history. |
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75 return iProvisionalResult; |
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76 } |
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77 |
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78 // --------------------------------------------------------- |
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79 // CCalcDocument::CalculateAndNoHistoryL |
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80 // This function is called when the calculations is not |
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81 // written to the Outputsheet (sqrt and percent in some cases). |
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82 // (other items were commented in a header). |
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83 // --------------------------------------------------------- |
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84 // |
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85 TReal64 CCalcDocument::CalculateAndNoHistoryL |
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86 (TReal64 aOperand, |
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87 const TCalcEditLine& aLine) |
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88 { |
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89 TReal64 result = CalculateL(aOperand, aLine.Operator()); |
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90 return result; |
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91 } |
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92 |
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93 // --------------------------------------------------------- |
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94 // CCalcDocument::CalculateAndModifyHistoryL |
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95 // This function is called when the output needs to be edited |
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96 // before it is displayed in the Outputsheet. This function |
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97 // may call the CalculateL twice, because it may need to |
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98 // calculate the percent first. |
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99 // (other items were commented in a header). |
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100 // --------------------------------------------------------- |
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101 // |
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102 TReal64 CCalcDocument::CalculateAndModifyHistoryL |
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103 (TReal64 aOperand, |
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104 TCalcEditLine& aLine, |
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105 TCalcEditLine::TCalcOperatorType aOperator) |
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106 { |
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107 if (aOperator == TCalcEditLine::ECalcMultiply) |
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108 iProvisionalResult = CalculateL(aOperand, aLine.Operator()); |
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109 else |
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110 { |
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111 TReal64 iTempResult = CalculateL(aOperand, aLine.Operator()); |
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112 iProvisionalResult = CalculateL(iTempResult, aOperator); |
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113 } |
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114 |
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115 aLine.SetOperator(aOperator); |
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116 // Get the percent character from iCalcAppEnv (it uses the resource |
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117 // file to get the character). |
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118 TChar character((iCalcAppEnv->OutSheetOperator(TCalcEditLine::ECalcPercent))[0]); |
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119 aLine.AppendNumberStringL(character); // Add percent to the line |
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120 iHistory->Add(aLine); // Add a line to history. |
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121 return iProvisionalResult; |
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122 } |
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123 |
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124 // --------------------------------------------------------- |
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125 // CCalcDocument::AddEqualLineAndUpdateLastResult |
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126 // This is called when "Equal" command is selected. |
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127 // (other items were commented in a header). |
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128 // --------------------------------------------------------- |
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129 // |
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130 void CCalcDocument::AddEqualLineAndUpdateLastResultL() |
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131 { |
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132 TCalcEditLine line; |
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133 line.SetOperator(TCalcEditLine::ECalcEqual); |
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134 line.SetNumber(iProvisionalResult); |
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135 iHistory->Add(line); // Add a line to history. |
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136 iLastResult = iProvisionalResult; |
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137 SaveStateL(); |
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138 } |
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139 |
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140 // --------------------------------------------------------- |
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141 // CCalcDocument::AddEmptyLine |
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142 // Add a empty line |
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143 // (other items were commented in a header). |
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144 // --------------------------------------------------------- |
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145 // |
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146 void CCalcDocument::AddEmptyLine() |
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147 { |
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148 TCalcEditLine line; |
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149 iHistory->Add(line); |
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150 } |
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151 |
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152 // --------------------------------------------------------- |
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153 // CCalcDocument::MemorySave |
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154 // Save a memory from value of current editor. |
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155 // (other items were commented in a header). |
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156 // --------------------------------------------------------- |
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157 // |
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158 void CCalcDocument::MemorySaveL |
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159 (TReal64 aNewMemory) |
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160 { |
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161 iMemory = aNewMemory; |
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162 SaveStateL(); |
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163 } |
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164 |
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165 |
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166 // --------------------------------------------------------- |
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167 // CCalcDocument::HasMemory |
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168 // Check memory non-zero. |
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169 // (other items were commented in a header). |
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170 // --------------------------------------------------------- |
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171 // |
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172 TBool CCalcDocument::HasMemory() const |
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173 { |
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174 return (iMemory != 0.0); |
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175 } |
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176 |
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177 // --------------------------------------------------------- |
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178 // CCalcDocument::Memory |
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179 // Return memory. |
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180 // (other items were commented in a header). |
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181 // --------------------------------------------------------- |
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182 // |
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183 TReal64 CCalcDocument::Memory() const |
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184 { |
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185 return (iMemory); |
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186 } |
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187 |
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188 // --------------------------------------------------------- |
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189 // CCalcDocument::MemoryClear |
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190 // Clear memory. |
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191 // (other items were commented in a header). |
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192 // --------------------------------------------------------- |
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193 // |
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194 void CCalcDocument::MemoryClearL() |
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195 { |
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196 iMemory = 0.0; |
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197 SaveStateL(); |
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198 } |
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199 |
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200 // ---------------------------------------------------- |
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201 // CCalcDocument::LastResult |
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202 // Return Last result. |
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203 // (other items were commented in a header). |
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204 // ---------------------------------------------------- |
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205 // |
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206 TReal64 CCalcDocument::LastResult() const |
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207 { |
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208 return (iLastResult); |
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209 } |
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210 |
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211 // ---------------------------------------------------- |
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212 // CCalcDocument::ProvisionalResult |
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213 // Return provisional result |
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214 // (other items were commented in a header). |
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215 // ---------------------------------------------------- |
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216 // |
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217 TReal64 CCalcDocument::ProvisionalResult() const |
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218 { |
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219 return iProvisionalResult; |
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220 } |
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221 |
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222 |
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223 // ---------------------------------------------------- |
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224 // CCalcDocument::History |
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225 // Return CCalcHistory class. |
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226 // (other items were commented in a header). |
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227 // ---------------------------------------------------- |
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228 // |
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229 CCalcHistory* CCalcDocument::History() const |
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230 { |
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231 return iHistory; |
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232 } |
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233 |
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234 |
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235 // C++ default constructor can NOT contain any code, that |
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236 // might leave. |
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237 // |
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238 CCalcDocument::CCalcDocument |
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239 (CEikApplication& aApp) |
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240 : CEikDocument(aApp) |
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241 { |
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242 } |
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243 |
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244 // Second phase constructor. |
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245 void CCalcDocument::ConstructL() |
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246 { |
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247 iHistory = new (ELeave) CCalcHistory(); |
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248 } |
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249 |
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250 // --------------------------------------------------------- |
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251 // CCalcDocument::CalculateL |
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252 // Calculate result |
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253 // Leave may occur, causes KErrOverflow or KErrDivideByZero. |
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254 // (other items were commented in a header). |
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255 // --------------------------------------------------------- |
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256 // |
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257 TReal64 CCalcDocument::CalculateL |
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258 (TReal64 aOperand, |
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259 TCalcEditLine::TCalcOperatorType aOperator) |
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260 { |
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261 TReal64 result(iProvisionalResult); |
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262 |
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263 switch (aOperator) |
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264 { |
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265 case TCalcEditLine::ECalcAdd: |
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266 { |
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267 result += aOperand; |
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268 if( Abs(result)<= KCalcDefaultZero ) |
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269 { |
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270 result = 0; |
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271 } |
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272 break; |
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273 } |
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274 case TCalcEditLine::ECalcSubtract: |
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275 { |
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276 result -= aOperand; |
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277 if( Abs(result)<= KCalcDefaultZero ) |
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278 { |
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279 result = 0; |
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280 } |
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281 break; |
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282 } |
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283 case TCalcEditLine::ECalcMultiply: |
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284 { |
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285 result *= aOperand; |
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286 break; |
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287 } |
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288 case TCalcEditLine::ECalcDivide: |
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289 { |
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290 if ( aOperand == 0 ) |
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291 { |
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292 iCCalcView->UpdateState( CCalcView::EOperator ); |
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293 User::Leave(KErrDivideByZero); // Error causes |
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294 } |
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295 else |
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296 { |
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297 result /= aOperand; |
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298 } |
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299 break; |
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300 } |
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301 case TCalcEditLine::ECalcSqrt: |
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302 { |
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303 if ( aOperand < 0 ) |
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304 { |
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305 User::Leave(KErrNotSupported); // Error causes |
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306 } |
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307 else |
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308 Math::Sqrt(result, aOperand); |
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309 break; |
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310 } |
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311 case TCalcEditLine::ECalcPercent: |
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312 { |
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313 result = (result * aOperand) / 100; |
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314 break; |
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315 } |
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316 case TCalcEditLine::ECalcOperatorNone: |
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317 { |
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318 result = aOperand; |
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319 break; |
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320 } |
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321 default: |
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322 { |
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323 break; |
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324 } |
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325 } |
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326 // Check Result. If overflow, Leave occurs. |
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327 CheckResultL(&result); |
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328 |
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329 // Overflow do not occur |
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330 return result; |
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331 } |
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332 |
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333 |
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334 // --------------------------------------------------------- |
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335 // CCalcDocument::CheckResultL |
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336 // Check overflow and underflow |
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337 // Leave may occur, causes KErrOverflow. |
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338 // (other items were commented in a header). |
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339 // --------------------------------------------------------- |
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340 // |
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341 void CCalcDocument::CheckResultL |
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342 (TReal64* aResult) |
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343 { |
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344 // Set data format |
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345 TRealFormat realFormat(KCalcMaxNumberWidth, KCalcMaxDigits); |
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346 if ( *aResult >= 0 ) |
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347 { |
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348 realFormat.iWidth--; |
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349 } |
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350 realFormat.iType = KRealFormatNoExponent; |
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351 realFormat.iTriLen = 0; // Delimit character is nothing |
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352 TLocale locale; |
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353 TChar separator(locale.DecimalSeparator()); |
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354 |
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355 realFormat.iPoint = separator; |
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356 |
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357 TBuf<KCalcMaxNumberWidth> buffer; |
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358 TInt code = buffer.Num(*aResult, realFormat); |
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359 |
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360 if(KErrOverflow == code || KErrUnderflow == code) |
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361 { |
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362 TRealFormat realFormat(KCalcMaxNumberWidth); |
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363 if ( *aResult >= 0 ) |
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364 { |
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365 realFormat.iWidth--; |
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366 } |
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367 realFormat.iType = KRealFormatExponent; |
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368 realFormat.iPlaces = 3; |
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369 realFormat.iTriLen = 0; // Delimit character is nothing |
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370 TLocale locale; |
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371 TChar separator(locale.DecimalSeparator()); |
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372 |
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373 realFormat.iPoint = separator; |
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374 |
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375 TBuf<KCalcMaxNumberWidth> buffer; |
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376 code = buffer.Num(*aResult, realFormat); |
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377 } |
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378 |
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379 switch (code) |
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380 { |
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381 case KErrOverflow: |
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382 { |
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383 User::Leave(KErrOverflow); |
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384 break; |
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385 } |
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386 case KErrUnderflow: |
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387 { |
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388 *aResult = 0.0; |
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389 break; |
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390 } |
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391 default: |
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392 { |
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393 break; |
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394 } |
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395 } |
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396 |
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397 } |
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398 |
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399 |
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400 // --------------------------------------------------------- |
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401 // CCalcDocument::ExternalizeL |
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402 // Externalising of the last result and memory. |
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403 // (other items were commented in a header). |
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404 // --------------------------------------------------------- |
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405 // |
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406 void CCalcDocument::ExternalizeL |
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407 (RWriteStream& aStream) const |
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408 { |
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409 aStream.WriteReal64L(iLastResult); // Write last result |
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410 aStream.WriteReal64L(iMemory); // Write memory |
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411 } |
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412 |
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413 // --------------------------------------------------------- |
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414 // CCalcDocument::InternalizeL |
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415 // Internalising of the last result and memory. |
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416 // (other items were commented in a header). |
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417 // --------------------------------------------------------- |
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418 // |
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419 void CCalcDocument::InternalizeL |
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420 (RReadStream& aStream) |
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421 { |
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422 iLastResult = aStream.ReadReal64L(); // Read last result |
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423 iMemory = aStream.ReadReal64L(); // Read memory |
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424 |
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425 // If read value is out of range, |
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426 // memory is replaced to default one. |
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427 TRAPD(error, CheckResultL(&iMemory)); |
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428 if (error == KErrOverflow) |
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429 { |
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430 iMemory = KCalcDefaultMemory; |
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431 } |
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432 |
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433 // If read value is out of range, |
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434 // last result is replaced to default one. |
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435 TRAP(error, CheckResultL(&iLastResult)); |
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436 if (error == KErrOverflow) |
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437 { |
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438 iLastResult = KCalcDefaultLastResult; |
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439 } |
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440 |
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441 } |
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442 |
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443 // --------------------------------------------------------- |
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444 // CCalcDocument::CreateAppUiL |
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445 // This function is called when Calculator application is opened. |
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446 // (other items were commented in a header). |
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447 // --------------------------------------------------------- |
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448 // |
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449 CEikAppUi* CCalcDocument::CreateAppUiL() |
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450 { |
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451 return new (ELeave) CCalcAppUi; |
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452 } |
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453 |
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454 // --------------------------------------------------------- |
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455 // CCalcDocument::SaveStateL |
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456 // Store memory and last result |
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457 // (other items were commented in a header). |
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458 // --------------------------------------------------------- |
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459 // |
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460 void CCalcDocument::SaveStateL() |
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461 { |
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462 RFileWriteStream out; |
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463 RFs fileSession; |
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464 |
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465 User::LeaveIfError(fileSession.Connect()); |
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466 CleanupClosePushL(fileSession); |
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467 |
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468 TFileName filePath; |
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469 TBuf<1> tempDes; |
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470 TChar driveChar; |
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471 |
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472 User::LeaveIfError(fileSession.PrivatePath(filePath)); |
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473 fileSession.DriveToChar(KDefaultDrive, driveChar); |
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474 tempDes.Append(driveChar); |
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475 filePath.Insert(0,KDelimiter); |
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476 filePath.Insert(0,tempDes); |
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477 filePath.Append(KCalculatorFilename); |
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478 |
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479 TInt err( out.Replace( fileSession, filePath,EFileWrite ) ); |
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480 |
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481 if( !err ) |
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482 { |
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483 TRAP( err, ExternalizeL( out ) ); |
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484 |
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485 out.Close(); |
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486 } |
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487 |
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488 CleanupStack::PopAndDestroy(); |
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489 |
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490 } |
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491 |
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492 // --------------------------------------------------------- |
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493 // CCalcDocument::LoadStateL |
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494 // Restore memory and last result |
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495 // This function is called when document file exists. |
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496 // (other items were commented in a header). |
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497 // --------------------------------------------------------- |
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498 // |
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499 void CCalcDocument::LoadStateL() |
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500 { |
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501 RFileReadStream in; |
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502 RFs fileSession; |
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503 |
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504 User::LeaveIfError(fileSession.Connect()); |
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505 CleanupClosePushL(fileSession); |
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506 |
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507 TFileName filePath; |
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508 TBuf<1> tempDes; |
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509 TChar driveChar; |
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510 User::LeaveIfError(fileSession.PrivatePath(filePath)); |
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511 fileSession.DriveToChar(KDefaultDrive, driveChar); |
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512 tempDes.Append(driveChar); |
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513 filePath.Insert(0,KDelimiter); |
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514 filePath.Insert(0,tempDes); |
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515 filePath.Append(KCalculatorFilename); |
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516 |
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517 TInt err( in.Open( fileSession, filePath, |
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518 EFileRead ) ); |
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519 |
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520 if( !err ) |
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521 { |
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522 TRAPD(readErr,InternalizeL( in ) ); |
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523 |
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524 if ( readErr ) |
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525 { |
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526 // Internalizing fails. |
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527 iMemory = KCalcDefaultMemory; // Reset memoey |
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528 iLastResult = KCalcDefaultLastResult; // Reset last result |
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529 } |
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530 |
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531 in.Close(); |
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532 } |
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533 CleanupStack::PopAndDestroy(); |
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534 |
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535 SetChanged(EFalse); |
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536 |
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537 } |
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538 |
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539 // --------------------------------------------------------- |
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540 // CCalcDocument::SetAppEnv |
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541 // This function is used to receive a pointer to the |
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542 // CCalcAppEnv. |
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543 // (other items were commented in a header). |
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544 // --------------------------------------------------------- |
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545 // |
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546 void CCalcDocument::SetAppEnv(CCalcAppEnv* aCalcAppEnv) |
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547 { |
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548 iCalcAppEnv = aCalcAppEnv; |
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549 } |
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550 |
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551 // --------------------------------------------------------- |
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552 // CCalcDocument::SetCalcView |
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553 // This function is used to receive a pointer to the |
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554 // SetCalcView. |
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555 // (other items were commented in a header). |
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556 // --------------------------------------------------------- |
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557 // |
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558 void CCalcDocument::SetCalcView( CCalcView* aCCalcView ) |
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559 { |
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560 iCCalcView = aCCalcView; |
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561 } |
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562 // End of File |