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1 /****************************************************************************
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2 **
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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4 ** Contact: Qt Software Information (qt-info@nokia.com)
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5 **
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6 ** This file is part of the example classes of the Qt Toolkit.
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7 **
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8 ** $QT_BEGIN_LICENSE:LGPL$
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9 ** Commercial Usage
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10 ** Licensees holding valid Qt Commercial licenses may use this file in
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11 ** accordance with the Qt Commercial License Agreement provided with the
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12 ** Software or, alternatively, in accordance with the terms contained in
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13 ** a written agreement between you and Nokia.
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14 **
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15 ** GNU Lesser General Public License Usage
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16 ** Alternatively, this file may be used under the terms of the GNU Lesser
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17 ** General Public License version 2.1 as published by the Free Software
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18 ** Foundation and appearing in the file LICENSE.LGPL included in the
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19 ** packaging of this file. Please review the following information to
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20 ** ensure the GNU Lesser General Public License version 2.1 requirements
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21 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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22 **
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23 ** In addition, as a special exception, Nokia gives you certain
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24 ** additional rights. These rights are described in the Nokia Qt LGPL
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25 ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
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26 ** package.
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27 **
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28 ** GNU General Public License Usage
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29 ** Alternatively, this file may be used under the terms of the GNU
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30 ** General Public License version 3.0 as published by the Free Software
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31 ** Foundation and appearing in the file LICENSE.GPL included in the
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32 ** packaging of this file. Please review the following information to
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33 ** ensure the GNU General Public License version 3.0 requirements will be
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34 ** met: http://www.gnu.org/copyleft/gpl.html.
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35 **
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36 ** If you are unsure which license is appropriate for your use, please
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37 ** contact the sales department at qt-sales@nokia.com.
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38 ** $QT_END_LICENSE$
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39 **
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40 ****************************************************************************/
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41
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42 module calculator;
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43
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44 import qt.gui.QDialog;
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45 import qt.gui.QGridLayout;
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46 import qt.gui.QLineEdit;
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47 import qt.gui.QFont;
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48
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49 import tango.math.Math : pow, sqrt;
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50 import Float = tango.text.convert.Float;
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51 import Integer = tango.text.convert.Integer;
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52 import tango.core.Array;
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53
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54 import button;
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55
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56
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57 class Calculator : public QDialog
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58 {
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59
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60 public:
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61
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62 this(QWidget parent = null)
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63 {
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64 super(parent);
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65
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66 sumInMemory = 0.0;
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67 sumSoFar = 0.0;
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68 factorSoFar = 0.0;
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69 waitingForOperand = true;
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70
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71 display = new QLineEdit("0");
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72 display.setReadOnly(true);
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73 display.setAlignment(Qt.AlignRight);
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74 display.setMaxLength(15);
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75
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76 QFont font = display.font();
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77 font.setPointSize(font.pointSize() + 8);
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78 display.setFont(font);
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79
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80 for (int i = 0; i < NumDigitButtons; ++i) {
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81 digitButtons[i] = createButton(Integer.toString(i), &digitClicked);
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82 }
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83
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84 Button pointButton = createButton(tr("."), &pointClicked);
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85 Button changeSignButton = createButton(tr("+/-"), &changeSignClicked);
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86
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87 Button backspaceButton = createButton(tr("Backspace"), &backspaceClicked);
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88 Button clearButton = createButton(tr("Clear"), &clear);
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89 Button clearAllButton = createButton(tr("Clear All"), &clearAll);
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90
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91 Button clearMemoryButton = createButton(tr("MC"), &clearMemory);
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92 Button readMemoryButton = createButton(tr("MR"), &readMemory);
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93 Button setMemoryButton = createButton(tr("MS"), &setMemory);
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94 Button addToMemoryButton = createButton(tr("M+"), &addToMemory);
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95
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96 Button divisionButton = createButton(tr("/"), &multiplicativeOperatorClicked);
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97 Button timesButton = createButton(tr("*"), &multiplicativeOperatorClicked);
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98 Button minusButton = createButton(tr("-"), &additiveOperatorClicked);
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99 Button plusButton = createButton(tr("+"), &additiveOperatorClicked);
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100
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101 Button squareRootButton = createButton(tr("Sqrt"), &unaryOperatorClicked);
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102 Button powerButton = createButton(tr("x^2"), &unaryOperatorClicked);
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103 Button reciprocalButton = createButton(tr("1/x"), &unaryOperatorClicked);
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104 Button equalButton = createButton(tr("="), &equalClicked);
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105
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106 QGridLayout mainLayout = new QGridLayout();
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107
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108 mainLayout.setSizeConstraint(QLayout.SetFixedSize);
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109
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110 mainLayout.addWidget(display, 0, 0, 1, 6);
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111 mainLayout.addWidget(backspaceButton, 1, 0, 1, 2);
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112 mainLayout.addWidget(clearButton, 1, 2, 1, 2);
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113 mainLayout.addWidget(clearAllButton, 1, 4, 1, 2);
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114
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115 mainLayout.addWidget(clearMemoryButton, 2, 0);
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116 mainLayout.addWidget(readMemoryButton, 3, 0);
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117 mainLayout.addWidget(setMemoryButton, 4, 0);
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118 mainLayout.addWidget(addToMemoryButton, 5, 0);
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119
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120 for (int i = 1; i < NumDigitButtons; ++i) {
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121 int row = ((9 - i) / 3) + 2;
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122 int column = ((i - 1) % 3) + 1;
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123 mainLayout.addWidget(digitButtons[i], row, column);
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124 }
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125
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126 mainLayout.addWidget(digitButtons[0], 5, 1);
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127 mainLayout.addWidget(pointButton, 5, 2);
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128 mainLayout.addWidget(changeSignButton, 5, 3);
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129
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130 mainLayout.addWidget(divisionButton, 2, 4);
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131 mainLayout.addWidget(timesButton, 3, 4);
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132 mainLayout.addWidget(minusButton, 4, 4);
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133 mainLayout.addWidget(plusButton, 5, 4);
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134
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135 mainLayout.addWidget(squareRootButton, 2, 5);
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136 mainLayout.addWidget(powerButton, 3, 5);
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137 mainLayout.addWidget(reciprocalButton, 4, 5);
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138 mainLayout.addWidget(equalButton, 5, 5);
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139 setLayout(mainLayout);
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140
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141 setWindowTitle(tr("Calculator"));
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142 }
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143
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144 //private slots:
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145 void digitClicked()
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146 {
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147 Button clickedButton = cast(Button) signalSender();
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148 int digitValue = Integer.toInt(clickedButton.text);
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149 if (display.text() == "0" && digitValue == 0.0)
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150 return;
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151
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152 if (waitingForOperand) {
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153 display.clear();
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154 waitingForOperand = false;
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155 }
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156 display.setText(display.text() ~ Integer.toString(digitValue));
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157 }
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158
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159 void unaryOperatorClicked()
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160 {
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161 Button clickedButton = cast(Button) signalSender();
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162 char[] clickedOperator = clickedButton.text();
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163 double operand = Float.toFloat(display.text);
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164 double result = 0.0;
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165
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166 if (clickedOperator == tr("Sqrt")) {
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167 if (operand < 0.0) {
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168 abortOperation();
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169 return;
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170 }
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171 result = sqrt(operand);
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172 } else if (clickedOperator == tr("x^2")) {
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173 result = pow(operand, 2.0);
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174 } else if (clickedOperator == tr("1/x")) {
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175 if (operand == 0.0) {
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176 abortOperation();
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177 return;
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178 }
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179 result = 1.0 / operand;
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180 }
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181 display.setText(Float.toString(result, 4));
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182 waitingForOperand = true;
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183 }
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184
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185 void additiveOperatorClicked()
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186 {
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187 Button clickedButton = cast(Button) signalSender();
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188 char[] clickedOperator = clickedButton.text();
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189 double operand = Float.toFloat(display.text);
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190
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191 if (pendingMultiplicativeOperator.length) {
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192 if (!calculate(operand, pendingMultiplicativeOperator)) {
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193 abortOperation();
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194 return;
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195 }
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196 display.setText(Float.toString(factorSoFar, 4));
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197 operand = factorSoFar;
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198 factorSoFar = 0.0;
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199 pendingMultiplicativeOperator = null;
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200 }
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201
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202 if (pendingAdditiveOperator.length) {
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203 if (!calculate(operand, pendingAdditiveOperator)) {
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204 abortOperation();
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205 return;
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206 }
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207 display.setText(Float.toString(sumSoFar, 4));
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208 } else {
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209 sumSoFar = operand;
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210 }
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211
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212 pendingAdditiveOperator = clickedOperator;
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213 waitingForOperand = true;
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214 }
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215
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216 void multiplicativeOperatorClicked()
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217 {
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218 Button clickedButton = cast(Button) signalSender();
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219 char[] clickedOperator = clickedButton.text();
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220 double operand = Float.toFloat(display.text);
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221
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222 if (pendingMultiplicativeOperator.length) {
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223 if (!calculate(operand, pendingMultiplicativeOperator)) {
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224 abortOperation();
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225 return;
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226 }
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227 display.setText(Float.toString(factorSoFar, 4));
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228 } else {
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229 factorSoFar = operand;
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230 }
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231
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232 pendingMultiplicativeOperator = clickedOperator;
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233 waitingForOperand = true;
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234 }
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235
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236 void equalClicked()
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237 {
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238 double operand = Float.toFloat(display.text);
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239
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240 if (pendingMultiplicativeOperator.length) {
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241 if (!calculate(operand, pendingMultiplicativeOperator)) {
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242 abortOperation();
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243 return;
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244 }
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245 operand = factorSoFar;
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246 factorSoFar = 0.0;
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247 pendingMultiplicativeOperator = null;
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248 }
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249 if (pendingAdditiveOperator.length) {
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250 if (!calculate(operand, pendingAdditiveOperator)) {
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251 abortOperation();
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252 return;
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253 }
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254 pendingAdditiveOperator = null;
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255 } else {
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256 sumSoFar = operand;
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257 }
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258
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259 display.setText(Float.toString(sumSoFar, 4));
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260 sumSoFar = 0.0;
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261 waitingForOperand = true;
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262 }
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263
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264 void pointClicked()
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265 {
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266 char[] text = display.text;
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267
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268 if (waitingForOperand)
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269 display.setText("0");
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270
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271 if (find(text, '.') >= text.length)
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272 display.setText(text ~ tr("."));
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273
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274 waitingForOperand = false;
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275 }
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276
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277 void changeSignClicked()
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278 {
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279 char[] text = display.text();
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280 double value = Float.toFloat(text);
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281
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282 if (value > 0.0) {
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283 text = "-" ~ text;
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284 } else if (value < 0.0) {
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285 text = text[1..$];
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286 }
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287 display.setText(text);
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288 }
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289
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290 void backspaceClicked()
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291 {
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292 if (waitingForOperand)
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293 return;
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294
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295 char[] text = display.text();
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296 text = text[0..$-1];
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297 if (text.length == 0) {
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298 text = "0";
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299 waitingForOperand = true;
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300 }
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301 display.setText(text);
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302 }
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303
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304
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305 void clear()
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306 {
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307 if (waitingForOperand)
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308 return;
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309
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310 display.setText("0");
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311 waitingForOperand = true;
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312 }
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313
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314 void clearAll()
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315 {
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316 sumSoFar = 0.0;
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317 factorSoFar = 0.0;
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318 pendingAdditiveOperator = null;
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319 pendingMultiplicativeOperator = null;
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320 display.setText("0");
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321 waitingForOperand = true;
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322 }
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323
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324 void clearMemory()
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325 {
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326 sumInMemory = 0.0;
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327 }
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328
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329 void readMemory()
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330 {
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331 display.setText(Float.toString(sumInMemory, 4));
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332 waitingForOperand = true;
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333 }
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334
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335 void setMemory()
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336 {
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337 equalClicked();
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338 sumInMemory = Float.toFloat(display.text);
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339 }
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340
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341 void addToMemory()
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342 {
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343 equalClicked();
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344 sumInMemory += Float.toFloat(display.text);
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345 }
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346
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347 private:
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348
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349 Button createButton(char[] text, void delegate() member)
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350 {
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351 Button button = new Button(text);
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352 button.clicked.connect(member);
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353 return button;
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354 }
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355
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356 void abortOperation()
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357 {
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358 clearAll();
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359 display.setText(tr("####"));
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360 }
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361
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362 bool calculate(double rightOperand, char[] pendingOperator)
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363 {
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364 if (pendingOperator == tr("+")) {
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365 sumSoFar += rightOperand;
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366 } else if (pendingOperator == tr("-")) {
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367 sumSoFar -= rightOperand;
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368 } else if (pendingOperator == tr("*")) {
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369 factorSoFar *= rightOperand;
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370 } else if (pendingOperator == tr("/")) {
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371 if (rightOperand == 0.0)
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372 return false;
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373 factorSoFar /= rightOperand;
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374 }
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375 return true;
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376 }
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377
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378 double sumInMemory;
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379 double sumSoFar;
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380 double factorSoFar;
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381 char[] pendingAdditiveOperator;
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382 char[] pendingMultiplicativeOperator;
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383 bool waitingForOperand;
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384
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385 QLineEdit display;
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386
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387 enum { NumDigitButtons = 10 };
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388 Button[NumDigitButtons] digitButtons;
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389 }
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