Mercurial > projects > qtd
annotate examples/widgets/calculator/calculator.d @ 350:31520b2c0b3c
Removed dependency on parent trait and stringof
| author | Max Samukha <maxter@spambox.com> |
|---|---|
| date | Thu, 20 May 2010 15:49:08 +0300 |
| parents | 7a3c43424dca |
| children |
| rev | line source |
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| 1 | 1 /**************************************************************************** |
| 2 ** | |
| 3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). | |
| 4 ** Contact: Qt Software Information (qt-info@nokia.com) | |
| 5 ** | |
| 6 ** This file is part of the example classes of the Qt Toolkit. | |
| 7 ** | |
| 8 ** $QT_BEGIN_LICENSE:LGPL$ | |
| 9 ** Commercial Usage | |
| 10 ** Licensees holding valid Qt Commercial licenses may use this file in | |
| 11 ** accordance with the Qt Commercial License Agreement provided with the | |
| 12 ** Software or, alternatively, in accordance with the terms contained in | |
| 13 ** a written agreement between you and Nokia. | |
| 14 ** | |
| 15 ** GNU Lesser General Public License Usage | |
| 16 ** Alternatively, this file may be used under the terms of the GNU Lesser | |
| 17 ** General Public License version 2.1 as published by the Free Software | |
| 18 ** Foundation and appearing in the file LICENSE.LGPL included in the | |
| 19 ** packaging of this file. Please review the following information to | |
| 20 ** ensure the GNU Lesser General Public License version 2.1 requirements | |
| 21 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. | |
| 22 ** | |
| 23 ** In addition, as a special exception, Nokia gives you certain | |
| 24 ** additional rights. These rights are described in the Nokia Qt LGPL | |
| 25 ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this | |
| 26 ** package. | |
| 27 ** | |
| 28 ** GNU General Public License Usage | |
| 29 ** Alternatively, this file may be used under the terms of the GNU | |
| 30 ** General Public License version 3.0 as published by the Free Software | |
| 31 ** Foundation and appearing in the file LICENSE.GPL included in the | |
| 32 ** packaging of this file. Please review the following information to | |
| 33 ** ensure the GNU General Public License version 3.0 requirements will be | |
| 34 ** met: http://www.gnu.org/copyleft/gpl.html. | |
| 35 ** | |
| 36 ** If you are unsure which license is appropriate for your use, please | |
| 37 ** contact the sales department at qt-sales@nokia.com. | |
| 38 ** $QT_END_LICENSE$ | |
| 39 ** | |
| 40 ****************************************************************************/ | |
| 41 | |
| 42 module calculator; | |
| 43 | |
| 210 | 44 import button; |
| 1 | 45 import qt.gui.QDialog; |
| 46 import qt.gui.QGridLayout; | |
| 47 import qt.gui.QLineEdit; | |
| 48 import qt.gui.QFont; | |
| 49 | |
| 215 | 50 import std.math; |
| 51 import std.conv; | |
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52 import std.string : format, indexOf; |
| 1 | 53 |
| 54 class Calculator : public QDialog | |
| 55 { | |
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56 |
| 1 | 57 public: |
| 58 this(QWidget parent = null) | |
| 59 { | |
| 60 super(parent); | |
| 61 | |
| 62 sumInMemory = 0.0; | |
| 63 sumSoFar = 0.0; | |
| 64 factorSoFar = 0.0; | |
| 65 waitingForOperand = true; | |
| 66 | |
| 67 display = new QLineEdit("0"); | |
| 68 display.setReadOnly(true); | |
| 69 display.setAlignment(Qt.AlignRight); | |
| 70 display.setMaxLength(15); | |
| 71 | |
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72 auto font = new QFont(display.font()); |
| 1 | 73 font.setPointSize(font.pointSize() + 8); |
| 74 display.setFont(font); | |
| 75 | |
| 76 for (int i = 0; i < NumDigitButtons; ++i) { | |
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77 digitButtons[i] = createButton(format("%d", i), "digitClicked"); |
| 1 | 78 } |
| 79 | |
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80 Button pointButton = createButton(tr("."), "pointClicked"); |
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81 Button changeSignButton = createButton(tr("+/-"), "changeSignClicked"); |
| 1 | 82 |
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83 Button backspaceButton = createButton(tr("Backspace"), "backspaceClicked"); |
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84 Button clearButton = createButton(tr("Clear"), "clear"); |
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85 Button clearAllButton = createButton(tr("Clear All"), "clearAll"); |
| 1 | 86 |
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87 Button clearMemoryButton = createButton(tr("MC"), "clearMemory"); |
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88 Button readMemoryButton = createButton(tr("MR"), "readMemory"); |
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89 Button setMemoryButton = createButton(tr("MS"), "setMemory"); |
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90 Button addToMemoryButton = createButton(tr("M+"), "addToMemory"); |
| 1 | 91 |
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92 Button divisionButton = createButton(tr("/"), "multiplicativeOperatorClicked"); |
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93 Button timesButton = createButton(tr("*"), "multiplicativeOperatorClicked"); |
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94 Button minusButton = createButton(tr("-"), "additiveOperatorClicked"); |
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95 Button plusButton = createButton(tr("+"), "additiveOperatorClicked"); |
| 1 | 96 |
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97 Button squareRootButton = createButton(tr("Sqrt"), "unaryOperatorClicked"); |
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98 Button powerButton = createButton(tr("x^2"), "unaryOperatorClicked"); |
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99 Button reciprocalButton = createButton(tr("1/x"), "unaryOperatorClicked"); |
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100 Button equalButton = createButton(tr("="), "equalClicked"); |
| 1 | 101 |
| 102 QGridLayout mainLayout = new QGridLayout(); | |
| 103 | |
| 104 mainLayout.setSizeConstraint(QLayout.SetFixedSize); | |
| 105 | |
| 106 mainLayout.addWidget(display, 0, 0, 1, 6); | |
| 107 mainLayout.addWidget(backspaceButton, 1, 0, 1, 2); | |
| 108 mainLayout.addWidget(clearButton, 1, 2, 1, 2); | |
| 109 mainLayout.addWidget(clearAllButton, 1, 4, 1, 2); | |
| 110 | |
| 111 mainLayout.addWidget(clearMemoryButton, 2, 0); | |
| 112 mainLayout.addWidget(readMemoryButton, 3, 0); | |
| 113 mainLayout.addWidget(setMemoryButton, 4, 0); | |
| 114 mainLayout.addWidget(addToMemoryButton, 5, 0); | |
| 115 | |
| 116 for (int i = 1; i < NumDigitButtons; ++i) { | |
| 117 int row = ((9 - i) / 3) + 2; | |
| 118 int column = ((i - 1) % 3) + 1; | |
| 119 mainLayout.addWidget(digitButtons[i], row, column); | |
| 120 } | |
| 121 | |
| 122 mainLayout.addWidget(digitButtons[0], 5, 1); | |
| 123 mainLayout.addWidget(pointButton, 5, 2); | |
| 124 mainLayout.addWidget(changeSignButton, 5, 3); | |
| 125 | |
| 126 mainLayout.addWidget(divisionButton, 2, 4); | |
| 127 mainLayout.addWidget(timesButton, 3, 4); | |
| 128 mainLayout.addWidget(minusButton, 4, 4); | |
| 129 mainLayout.addWidget(plusButton, 5, 4); | |
| 130 | |
| 131 mainLayout.addWidget(squareRootButton, 2, 5); | |
| 132 mainLayout.addWidget(powerButton, 3, 5); | |
| 133 mainLayout.addWidget(reciprocalButton, 4, 5); | |
| 134 mainLayout.addWidget(equalButton, 5, 5); | |
| 135 setLayout(mainLayout); | |
| 136 | |
| 137 setWindowTitle(tr("Calculator")); | |
| 138 } | |
| 139 | |
| 140 //private slots: | |
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141 void slot_digitClicked() |
| 1 | 142 { |
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143 Button clickedButton = cast(Button) sender(); |
| 215 | 144 int digitValue = to!int(clickedButton.text); |
| 1 | 145 if (display.text() == "0" && digitValue == 0.0) |
| 146 return; | |
| 147 | |
| 148 if (waitingForOperand) { | |
| 149 display.clear(); | |
| 150 waitingForOperand = false; | |
| 151 } | |
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152 |
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153 display.setText(display.text() ~ format("%s", digitValue)); |
| 1 | 154 } |
| 155 | |
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156 void slot_unaryOperatorClicked() |
| 1 | 157 { |
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158 Button clickedButton = cast(Button) sender(); |
| 210 | 159 string clickedOperator = clickedButton.text(); |
| 215 | 160 double operand = to!float(display.text); |
| 1 | 161 double result = 0.0; |
| 162 | |
| 163 if (clickedOperator == tr("Sqrt")) { | |
| 164 if (operand < 0.0) { | |
| 165 abortOperation(); | |
| 166 return; | |
| 167 } | |
| 168 result = sqrt(operand); | |
| 169 } else if (clickedOperator == tr("x^2")) { | |
| 170 result = pow(operand, 2.0); | |
| 171 } else if (clickedOperator == tr("1/x")) { | |
| 172 if (operand == 0.0) { | |
| 173 abortOperation(); | |
| 174 return; | |
| 175 } | |
| 176 result = 1.0 / operand; | |
| 177 } | |
| 215 | 178 display.setText(format("%g", result)); |
| 1 | 179 waitingForOperand = true; |
| 180 } | |
| 181 | |
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182 void slot_additiveOperatorClicked() |
| 1 | 183 { |
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184 Button clickedButton = cast(Button) sender(); |
| 210 | 185 string clickedOperator = clickedButton.text(); |
| 215 | 186 double operand = to!float(display.text); |
| 1 | 187 |
| 188 if (pendingMultiplicativeOperator.length) { | |
| 189 if (!calculate(operand, pendingMultiplicativeOperator)) { | |
| 190 abortOperation(); | |
| 191 return; | |
| 192 } | |
| 215 | 193 display.setText(format("%g", factorSoFar)); |
| 1 | 194 operand = factorSoFar; |
| 195 factorSoFar = 0.0; | |
| 196 pendingMultiplicativeOperator = null; | |
| 197 } | |
| 198 | |
| 199 if (pendingAdditiveOperator.length) { | |
| 200 if (!calculate(operand, pendingAdditiveOperator)) { | |
| 201 abortOperation(); | |
| 202 return; | |
| 203 } | |
| 215 | 204 display.setText(format("%g", sumSoFar)); |
| 1 | 205 } else { |
| 206 sumSoFar = operand; | |
| 207 } | |
| 208 | |
| 209 pendingAdditiveOperator = clickedOperator; | |
| 210 waitingForOperand = true; | |
| 211 } | |
| 212 | |
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213 void slot_multiplicativeOperatorClicked() |
| 1 | 214 { |
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215 Button clickedButton = cast(Button) sender(); |
| 210 | 216 string clickedOperator = clickedButton.text(); |
| 215 | 217 double operand = to!float(display.text); |
| 1 | 218 |
| 219 if (pendingMultiplicativeOperator.length) { | |
| 220 if (!calculate(operand, pendingMultiplicativeOperator)) { | |
| 221 abortOperation(); | |
| 222 return; | |
| 223 } | |
| 215 | 224 display.setText(format("%g", factorSoFar)); |
| 1 | 225 } else { |
| 226 factorSoFar = operand; | |
| 227 } | |
| 228 | |
| 229 pendingMultiplicativeOperator = clickedOperator; | |
| 230 waitingForOperand = true; | |
| 231 } | |
| 232 | |
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233 void slot_equalClicked() |
| 1 | 234 { |
| 215 | 235 double operand = to!float(display.text); |
| 1 | 236 |
| 237 if (pendingMultiplicativeOperator.length) { | |
| 238 if (!calculate(operand, pendingMultiplicativeOperator)) { | |
| 239 abortOperation(); | |
| 240 return; | |
| 241 } | |
| 242 operand = factorSoFar; | |
| 243 factorSoFar = 0.0; | |
| 244 pendingMultiplicativeOperator = null; | |
| 245 } | |
| 246 if (pendingAdditiveOperator.length) { | |
| 247 if (!calculate(operand, pendingAdditiveOperator)) { | |
| 248 abortOperation(); | |
| 249 return; | |
| 250 } | |
| 251 pendingAdditiveOperator = null; | |
| 252 } else { | |
| 253 sumSoFar = operand; | |
| 254 } | |
| 255 | |
| 215 | 256 display.setText(format("%g", sumSoFar)); |
| 1 | 257 sumSoFar = 0.0; |
| 258 waitingForOperand = true; | |
| 259 } | |
| 260 | |
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261 void slot_pointClicked() |
| 1 | 262 { |
| 210 | 263 string text = display.text; |
| 1 | 264 |
| 265 if (waitingForOperand) | |
| 266 display.setText("0"); | |
| 267 | |
| 215 | 268 if (indexOf(text, '.') >= text.length) |
| 1 | 269 display.setText(text ~ tr(".")); |
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270 |
| 1 | 271 waitingForOperand = false; |
| 272 } | |
| 273 | |
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274 void slot_changeSignClicked() |
| 1 | 275 { |
| 210 | 276 string text = display.text(); |
| 215 | 277 double value = to!float(text); |
| 1 | 278 |
| 279 if (value > 0.0) { | |
| 280 text = "-" ~ text; | |
| 281 } else if (value < 0.0) { | |
| 282 text = text[1..$]; | |
| 283 } | |
| 284 display.setText(text); | |
| 285 } | |
| 286 | |
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287 void slot_backspaceClicked() |
| 1 | 288 { |
| 289 if (waitingForOperand) | |
| 290 return; | |
| 291 | |
| 210 | 292 string text = display.text(); |
| 1 | 293 text = text[0..$-1]; |
| 294 if (text.length == 0) { | |
| 295 text = "0"; | |
| 296 waitingForOperand = true; | |
| 297 } | |
| 298 display.setText(text); | |
| 299 } | |
| 300 | |
| 301 | |
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302 void slot_clear() |
| 1 | 303 { |
| 304 if (waitingForOperand) | |
| 305 return; | |
| 306 | |
| 307 display.setText("0"); | |
| 308 waitingForOperand = true; | |
| 309 } | |
| 310 | |
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311 void slot_clearAll() |
| 1 | 312 { |
| 313 sumSoFar = 0.0; | |
| 314 factorSoFar = 0.0; | |
| 315 pendingAdditiveOperator = null; | |
| 316 pendingMultiplicativeOperator = null; | |
| 317 display.setText("0"); | |
| 318 waitingForOperand = true; | |
| 319 } | |
| 320 | |
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321 void slot_clearMemory() |
| 1 | 322 { |
| 323 sumInMemory = 0.0; | |
| 324 } | |
| 325 | |
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326 void slot_readMemory() |
| 1 | 327 { |
| 215 | 328 display.setText(format("%g", sumInMemory)); |
| 1 | 329 waitingForOperand = true; |
| 330 } | |
| 331 | |
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332 void slot_setMemory() |
| 1 | 333 { |
| 334 equalClicked(); | |
| 215 | 335 sumInMemory = to!float(display.text); |
| 1 | 336 } |
| 337 | |
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338 void slot_addToMemory() |
| 1 | 339 { |
| 340 equalClicked(); | |
| 215 | 341 sumInMemory += to!float(display.text); |
| 1 | 342 } |
| 343 | |
| 344 private: | |
| 345 | |
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346 Button createButton(string text, string member) |
| 1 | 347 { |
| 348 Button button = new Button(text); | |
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349 connect(button, "clicked", this, member); |
| 1 | 350 return button; |
| 351 } | |
| 352 | |
| 353 void abortOperation() | |
| 354 { | |
| 355 clearAll(); | |
| 356 display.setText(tr("####")); | |
| 357 } | |
| 358 | |
| 210 | 359 bool calculate(double rightOperand, string pendingOperator) |
| 1 | 360 { |
| 361 if (pendingOperator == tr("+")) { | |
| 362 sumSoFar += rightOperand; | |
| 363 } else if (pendingOperator == tr("-")) { | |
| 364 sumSoFar -= rightOperand; | |
| 365 } else if (pendingOperator == tr("*")) { | |
| 366 factorSoFar *= rightOperand; | |
| 367 } else if (pendingOperator == tr("/")) { | |
| 368 if (rightOperand == 0.0) | |
| 369 return false; | |
| 370 factorSoFar /= rightOperand; | |
| 371 } | |
| 372 return true; | |
| 373 } | |
| 374 | |
| 375 double sumInMemory; | |
| 376 double sumSoFar; | |
| 377 double factorSoFar; | |
| 210 | 378 string pendingAdditiveOperator; |
| 379 string pendingMultiplicativeOperator; | |
| 1 | 380 bool waitingForOperand; |
| 381 | |
| 382 QLineEdit display; | |
| 383 | |
| 384 enum { NumDigitButtons = 10 }; | |
| 385 Button[NumDigitButtons] digitButtons; | |
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387 mixin Q_OBJECT; |
| 1 | 388 } |