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1
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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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210
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44 import button;
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1
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45 import qt.gui.QDialog;
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46 import qt.gui.QGridLayout;
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47 import qt.gui.QLineEdit;
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48 import qt.gui.QFont;
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49
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210
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50 version(Tango)
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51 {
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52 import tango.math.Math;
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53 import tango.math.Math : pow, sqrt;
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54 import Float = tango.text.convert.Float;
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55 import Integer = tango.text.convert.Integer;
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56 import tango.core.Array;
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57 string ToString(int x)
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58 {
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59 return Integer.toString(x);
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60 }
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61 string ToString(double x, int c = 0)
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62 {
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63 return Float.toString(x, c);
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64 }
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65 int ToInt(string s)
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66 {
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67 return Integer.toInt(s);
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68 }
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69 float ToFloat(string s)
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70 {
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71 return Float.toFloat(s);
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72 }
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73 }
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74 else
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75 {
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76 import std.math;
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77 import std.conv;
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78 import std.string;
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79 string ToString(int x)
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80 {
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81 return std.string.format("%d", x);
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82 }
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83 string ToString(double x, int c = 0)
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84 {
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85 return std.string.format("%g", x);
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86 }
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87 int ToInt(string s)
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88 {
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211
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89 return to!(int)(s);
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210
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90 }
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91 float ToFloat(string s)
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92 {
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211
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93 return to!(float)(s);
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210
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94 }
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95 int find(string s, dchar c)
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96 {
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97 return indexOf(s,c);
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98 }
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99 }
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1
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100
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101 class Calculator : public QDialog
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102 {
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103
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104 public:
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105
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106 this(QWidget parent = null)
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107 {
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108 super(parent);
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109
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110 sumInMemory = 0.0;
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111 sumSoFar = 0.0;
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112 factorSoFar = 0.0;
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113 waitingForOperand = true;
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114
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115 display = new QLineEdit("0");
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116 display.setReadOnly(true);
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117 display.setAlignment(Qt.AlignRight);
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118 display.setMaxLength(15);
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119
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210
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120 auto font = new QFont(display.font());
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1
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121 font.setPointSize(font.pointSize() + 8);
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122 display.setFont(font);
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123
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124 for (int i = 0; i < NumDigitButtons; ++i) {
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210
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125 digitButtons[i] = createButton(ToString(i), &digitClicked);
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1
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126 }
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127
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128 Button pointButton = createButton(tr("."), &pointClicked);
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129 Button changeSignButton = createButton(tr("+/-"), &changeSignClicked);
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130
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131 Button backspaceButton = createButton(tr("Backspace"), &backspaceClicked);
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132 Button clearButton = createButton(tr("Clear"), &clear);
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133 Button clearAllButton = createButton(tr("Clear All"), &clearAll);
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134
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135 Button clearMemoryButton = createButton(tr("MC"), &clearMemory);
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136 Button readMemoryButton = createButton(tr("MR"), &readMemory);
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137 Button setMemoryButton = createButton(tr("MS"), &setMemory);
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138 Button addToMemoryButton = createButton(tr("M+"), &addToMemory);
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139
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140 Button divisionButton = createButton(tr("/"), &multiplicativeOperatorClicked);
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141 Button timesButton = createButton(tr("*"), &multiplicativeOperatorClicked);
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142 Button minusButton = createButton(tr("-"), &additiveOperatorClicked);
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143 Button plusButton = createButton(tr("+"), &additiveOperatorClicked);
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144
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145 Button squareRootButton = createButton(tr("Sqrt"), &unaryOperatorClicked);
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146 Button powerButton = createButton(tr("x^2"), &unaryOperatorClicked);
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147 Button reciprocalButton = createButton(tr("1/x"), &unaryOperatorClicked);
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148 Button equalButton = createButton(tr("="), &equalClicked);
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149
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150 QGridLayout mainLayout = new QGridLayout();
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151
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152 mainLayout.setSizeConstraint(QLayout.SetFixedSize);
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153
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154 mainLayout.addWidget(display, 0, 0, 1, 6);
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155 mainLayout.addWidget(backspaceButton, 1, 0, 1, 2);
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156 mainLayout.addWidget(clearButton, 1, 2, 1, 2);
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157 mainLayout.addWidget(clearAllButton, 1, 4, 1, 2);
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158
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159 mainLayout.addWidget(clearMemoryButton, 2, 0);
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160 mainLayout.addWidget(readMemoryButton, 3, 0);
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161 mainLayout.addWidget(setMemoryButton, 4, 0);
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162 mainLayout.addWidget(addToMemoryButton, 5, 0);
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163
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164 for (int i = 1; i < NumDigitButtons; ++i) {
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165 int row = ((9 - i) / 3) + 2;
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166 int column = ((i - 1) % 3) + 1;
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167 mainLayout.addWidget(digitButtons[i], row, column);
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168 }
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169
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170 mainLayout.addWidget(digitButtons[0], 5, 1);
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171 mainLayout.addWidget(pointButton, 5, 2);
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172 mainLayout.addWidget(changeSignButton, 5, 3);
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173
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174 mainLayout.addWidget(divisionButton, 2, 4);
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175 mainLayout.addWidget(timesButton, 3, 4);
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176 mainLayout.addWidget(minusButton, 4, 4);
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177 mainLayout.addWidget(plusButton, 5, 4);
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178
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179 mainLayout.addWidget(squareRootButton, 2, 5);
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180 mainLayout.addWidget(powerButton, 3, 5);
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181 mainLayout.addWidget(reciprocalButton, 4, 5);
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182 mainLayout.addWidget(equalButton, 5, 5);
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183 setLayout(mainLayout);
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184
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185 setWindowTitle(tr("Calculator"));
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186 }
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187
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188 //private slots:
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189 void digitClicked()
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190 {
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191 Button clickedButton = cast(Button) signalSender();
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210
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192 int digitValue = ToInt(clickedButton.text);
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1
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193 if (display.text() == "0" && digitValue == 0.0)
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194 return;
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195
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196 if (waitingForOperand) {
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197 display.clear();
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198 waitingForOperand = false;
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199 }
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210
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200 display.setText(display.text() ~ ToString(digitValue));
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1
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201 }
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202
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203 void unaryOperatorClicked()
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204 {
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205 Button clickedButton = cast(Button) signalSender();
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210
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206 string clickedOperator = clickedButton.text();
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207 double operand = ToFloat(display.text);
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1
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208 double result = 0.0;
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209
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210 if (clickedOperator == tr("Sqrt")) {
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211 if (operand < 0.0) {
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212 abortOperation();
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213 return;
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214 }
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215 result = sqrt(operand);
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216 } else if (clickedOperator == tr("x^2")) {
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217 result = pow(operand, 2.0);
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218 } else if (clickedOperator == tr("1/x")) {
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219 if (operand == 0.0) {
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220 abortOperation();
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221 return;
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222 }
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223 result = 1.0 / operand;
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224 }
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210
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225 display.setText(ToString(result, 4));
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1
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226 waitingForOperand = true;
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227 }
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228
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229 void additiveOperatorClicked()
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230 {
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231 Button clickedButton = cast(Button) signalSender();
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210
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232 string clickedOperator = clickedButton.text();
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233 double operand = ToFloat(display.text);
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1
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234
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235 if (pendingMultiplicativeOperator.length) {
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236 if (!calculate(operand, pendingMultiplicativeOperator)) {
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237 abortOperation();
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238 return;
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239 }
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210
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240 display.setText(ToString(factorSoFar, 4));
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1
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241 operand = factorSoFar;
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242 factorSoFar = 0.0;
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243 pendingMultiplicativeOperator = null;
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244 }
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245
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246 if (pendingAdditiveOperator.length) {
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247 if (!calculate(operand, pendingAdditiveOperator)) {
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248 abortOperation();
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249 return;
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250 }
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210
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251 display.setText(ToString(sumSoFar, 4));
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1
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252 } else {
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253 sumSoFar = operand;
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254 }
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255
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256 pendingAdditiveOperator = clickedOperator;
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257 waitingForOperand = true;
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258 }
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259
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260 void multiplicativeOperatorClicked()
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261 {
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262 Button clickedButton = cast(Button) signalSender();
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210
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263 string clickedOperator = clickedButton.text();
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264 double operand = ToFloat(display.text);
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1
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265
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266 if (pendingMultiplicativeOperator.length) {
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267 if (!calculate(operand, pendingMultiplicativeOperator)) {
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268 abortOperation();
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269 return;
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270 }
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210
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271 display.setText(ToString(factorSoFar/*, 4*/));
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1
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272 } else {
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273 factorSoFar = operand;
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274 }
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275
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276 pendingMultiplicativeOperator = clickedOperator;
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277 waitingForOperand = true;
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278 }
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279
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280 void equalClicked()
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281 {
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210
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282 double operand = ToFloat(display.text);
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1
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283
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284 if (pendingMultiplicativeOperator.length) {
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285 if (!calculate(operand, pendingMultiplicativeOperator)) {
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286 abortOperation();
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287 return;
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288 }
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289 operand = factorSoFar;
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290 factorSoFar = 0.0;
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291 pendingMultiplicativeOperator = null;
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292 }
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293 if (pendingAdditiveOperator.length) {
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294 if (!calculate(operand, pendingAdditiveOperator)) {
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295 abortOperation();
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296 return;
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297 }
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298 pendingAdditiveOperator = null;
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299 } else {
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300 sumSoFar = operand;
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301 }
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302
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210
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303 display.setText(ToString(sumSoFar, 4));
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1
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304 sumSoFar = 0.0;
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305 waitingForOperand = true;
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306 }
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307
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308 void pointClicked()
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309 {
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210
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310 string text = display.text;
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1
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311
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312 if (waitingForOperand)
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313 display.setText("0");
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314
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315 if (find(text, '.') >= text.length)
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316 display.setText(text ~ tr("."));
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317
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318 waitingForOperand = false;
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319 }
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320
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321 void changeSignClicked()
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322 {
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210
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323 string text = display.text();
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324 double value = ToFloat(text);
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1
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325
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326 if (value > 0.0) {
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327 text = "-" ~ text;
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328 } else if (value < 0.0) {
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329 text = text[1..$];
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330 }
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331 display.setText(text);
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332 }
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333
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334 void backspaceClicked()
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335 {
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336 if (waitingForOperand)
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337 return;
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338
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210
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339 string text = display.text();
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1
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340 text = text[0..$-1];
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341 if (text.length == 0) {
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342 text = "0";
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343 waitingForOperand = true;
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344 }
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345 display.setText(text);
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346 }
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347
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348
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349 void clear()
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350 {
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351 if (waitingForOperand)
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352 return;
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353
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354 display.setText("0");
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355 waitingForOperand = true;
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356 }
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357
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358 void clearAll()
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359 {
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360 sumSoFar = 0.0;
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361 factorSoFar = 0.0;
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362 pendingAdditiveOperator = null;
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363 pendingMultiplicativeOperator = null;
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364 display.setText("0");
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365 waitingForOperand = true;
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366 }
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367
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368 void clearMemory()
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369 {
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370 sumInMemory = 0.0;
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371 }
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372
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373 void readMemory()
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374 {
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210
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375 display.setText(ToString(sumInMemory, 4));
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1
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376 waitingForOperand = true;
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377 }
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378
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379 void setMemory()
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380 {
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381 equalClicked();
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210
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382 sumInMemory = ToFloat(display.text);
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1
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383 }
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384
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385 void addToMemory()
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386 {
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387 equalClicked();
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210
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388 sumInMemory += ToFloat(display.text);
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1
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389 }
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390
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391 private:
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392
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210
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393 Button createButton(string text, void delegate() member)
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1
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394 {
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395 Button button = new Button(text);
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396 button.clicked.connect(member);
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397 return button;
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398 }
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399
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400 void abortOperation()
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401 {
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402 clearAll();
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403 display.setText(tr("####"));
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404 }
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405
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210
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406 bool calculate(double rightOperand, string pendingOperator)
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1
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407 {
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408 if (pendingOperator == tr("+")) {
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409 sumSoFar += rightOperand;
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410 } else if (pendingOperator == tr("-")) {
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411 sumSoFar -= rightOperand;
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412 } else if (pendingOperator == tr("*")) {
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413 factorSoFar *= rightOperand;
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414 } else if (pendingOperator == tr("/")) {
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415 if (rightOperand == 0.0)
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416 return false;
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417 factorSoFar /= rightOperand;
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418 }
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419 return true;
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420 }
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421
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422 double sumInMemory;
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423 double sumSoFar;
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424 double factorSoFar;
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210
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425 string pendingAdditiveOperator;
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426 string pendingMultiplicativeOperator;
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1
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427 bool waitingForOperand;
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428
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429 QLineEdit display;
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430
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431 enum { NumDigitButtons = 10 };
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432 Button[NumDigitButtons] digitButtons;
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433 }
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