Mercurial > projects > qtd
view examples/widgets/calculator/calculator.d @ 300:c2c70e501860 signals
updated interview demo
author | eldar |
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date | Sun, 06 Dec 2009 22:21:22 +0000 |
parents | 256ab6cb8e85 |
children | 7a3c43424dca |
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/**************************************************************************** ** ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). ** Contact: Qt Software Information (qt-info@nokia.com) ** ** This file is part of the example classes of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial Usage ** Licensees holding valid Qt Commercial licenses may use this file in ** accordance with the Qt Commercial License Agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and Nokia. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain ** additional rights. These rights are described in the Nokia Qt LGPL ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this ** package. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3.0 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU General Public License version 3.0 requirements will be ** met: http://www.gnu.org/copyleft/gpl.html. ** ** If you are unsure which license is appropriate for your use, please ** contact the sales department at qt-sales@nokia.com. ** $QT_END_LICENSE$ ** ****************************************************************************/ module calculator; import button; import qt.gui.QDialog; import qt.gui.QGridLayout; import qt.gui.QLineEdit; import qt.gui.QFont; import std.math; import std.conv; import std.string; class Calculator : public QDialog { public: this(QWidget parent = null) { super(parent); sumInMemory = 0.0; sumSoFar = 0.0; factorSoFar = 0.0; waitingForOperand = true; display = new QLineEdit("0"); display.setReadOnly(true); display.setAlignment(Qt.AlignRight); display.setMaxLength(15); auto font = new QFont(display.font()); font.setPointSize(font.pointSize() + 8); display.setFont(font); for (int i = 0; i < NumDigitButtons; ++i) { digitButtons[i] = createButton(format("%d", i), &digitClicked); } Button pointButton = createButton(tr("."), &pointClicked); Button changeSignButton = createButton(tr("+/-"), &changeSignClicked); Button backspaceButton = createButton(tr("Backspace"), &backspaceClicked); Button clearButton = createButton(tr("Clear"), &clear); Button clearAllButton = createButton(tr("Clear All"), &clearAll); Button clearMemoryButton = createButton(tr("MC"), &clearMemory); Button readMemoryButton = createButton(tr("MR"), &readMemory); Button setMemoryButton = createButton(tr("MS"), &setMemory); Button addToMemoryButton = createButton(tr("M+"), &addToMemory); Button divisionButton = createButton(tr("/"), &multiplicativeOperatorClicked); Button timesButton = createButton(tr("*"), &multiplicativeOperatorClicked); Button minusButton = createButton(tr("-"), &additiveOperatorClicked); Button plusButton = createButton(tr("+"), &additiveOperatorClicked); Button squareRootButton = createButton(tr("Sqrt"), &unaryOperatorClicked); Button powerButton = createButton(tr("x^2"), &unaryOperatorClicked); Button reciprocalButton = createButton(tr("1/x"), &unaryOperatorClicked); Button equalButton = createButton(tr("="), &equalClicked); QGridLayout mainLayout = new QGridLayout(); mainLayout.setSizeConstraint(QLayout.SetFixedSize); mainLayout.addWidget(display, 0, 0, 1, 6); mainLayout.addWidget(backspaceButton, 1, 0, 1, 2); mainLayout.addWidget(clearButton, 1, 2, 1, 2); mainLayout.addWidget(clearAllButton, 1, 4, 1, 2); mainLayout.addWidget(clearMemoryButton, 2, 0); mainLayout.addWidget(readMemoryButton, 3, 0); mainLayout.addWidget(setMemoryButton, 4, 0); mainLayout.addWidget(addToMemoryButton, 5, 0); for (int i = 1; i < NumDigitButtons; ++i) { int row = ((9 - i) / 3) + 2; int column = ((i - 1) % 3) + 1; mainLayout.addWidget(digitButtons[i], row, column); } mainLayout.addWidget(digitButtons[0], 5, 1); mainLayout.addWidget(pointButton, 5, 2); mainLayout.addWidget(changeSignButton, 5, 3); mainLayout.addWidget(divisionButton, 2, 4); mainLayout.addWidget(timesButton, 3, 4); mainLayout.addWidget(minusButton, 4, 4); mainLayout.addWidget(plusButton, 5, 4); mainLayout.addWidget(squareRootButton, 2, 5); mainLayout.addWidget(powerButton, 3, 5); mainLayout.addWidget(reciprocalButton, 4, 5); mainLayout.addWidget(equalButton, 5, 5); setLayout(mainLayout); setWindowTitle(tr("Calculator")); } //private slots: void digitClicked() { Button clickedButton = cast(Button) signalSender(); int digitValue = to!int(clickedButton.text); if (display.text() == "0" && digitValue == 0.0) return; if (waitingForOperand) { display.clear(); waitingForOperand = false; } display.setText(display.text() ~ format("%g", digitValue)); } void unaryOperatorClicked() { Button clickedButton = cast(Button) signalSender(); string clickedOperator = clickedButton.text(); double operand = to!float(display.text); double result = 0.0; if (clickedOperator == tr("Sqrt")) { if (operand < 0.0) { abortOperation(); return; } result = sqrt(operand); } else if (clickedOperator == tr("x^2")) { result = pow(operand, 2.0); } else if (clickedOperator == tr("1/x")) { if (operand == 0.0) { abortOperation(); return; } result = 1.0 / operand; } display.setText(format("%g", result)); waitingForOperand = true; } void additiveOperatorClicked() { Button clickedButton = cast(Button) signalSender(); string clickedOperator = clickedButton.text(); double operand = to!float(display.text); if (pendingMultiplicativeOperator.length) { if (!calculate(operand, pendingMultiplicativeOperator)) { abortOperation(); return; } display.setText(format("%g", factorSoFar)); operand = factorSoFar; factorSoFar = 0.0; pendingMultiplicativeOperator = null; } if (pendingAdditiveOperator.length) { if (!calculate(operand, pendingAdditiveOperator)) { abortOperation(); return; } display.setText(format("%g", sumSoFar)); } else { sumSoFar = operand; } pendingAdditiveOperator = clickedOperator; waitingForOperand = true; } void multiplicativeOperatorClicked() { Button clickedButton = cast(Button) signalSender(); string clickedOperator = clickedButton.text(); double operand = to!float(display.text); if (pendingMultiplicativeOperator.length) { if (!calculate(operand, pendingMultiplicativeOperator)) { abortOperation(); return; } display.setText(format("%g", factorSoFar)); } else { factorSoFar = operand; } pendingMultiplicativeOperator = clickedOperator; waitingForOperand = true; } void equalClicked() { double operand = to!float(display.text); if (pendingMultiplicativeOperator.length) { if (!calculate(operand, pendingMultiplicativeOperator)) { abortOperation(); return; } operand = factorSoFar; factorSoFar = 0.0; pendingMultiplicativeOperator = null; } if (pendingAdditiveOperator.length) { if (!calculate(operand, pendingAdditiveOperator)) { abortOperation(); return; } pendingAdditiveOperator = null; } else { sumSoFar = operand; } display.setText(format("%g", sumSoFar)); sumSoFar = 0.0; waitingForOperand = true; } void pointClicked() { string text = display.text; if (waitingForOperand) display.setText("0"); if (indexOf(text, '.') >= text.length) display.setText(text ~ tr(".")); waitingForOperand = false; } void changeSignClicked() { string text = display.text(); double value = to!float(text); if (value > 0.0) { text = "-" ~ text; } else if (value < 0.0) { text = text[1..$]; } display.setText(text); } void backspaceClicked() { if (waitingForOperand) return; string text = display.text(); text = text[0..$-1]; if (text.length == 0) { text = "0"; waitingForOperand = true; } display.setText(text); } void clear() { if (waitingForOperand) return; display.setText("0"); waitingForOperand = true; } void clearAll() { sumSoFar = 0.0; factorSoFar = 0.0; pendingAdditiveOperator = null; pendingMultiplicativeOperator = null; display.setText("0"); waitingForOperand = true; } void clearMemory() { sumInMemory = 0.0; } void readMemory() { display.setText(format("%g", sumInMemory)); waitingForOperand = true; } void setMemory() { equalClicked(); sumInMemory = to!float(display.text); } void addToMemory() { equalClicked(); sumInMemory += to!float(display.text); } private: Button createButton(string text, void delegate() member) { Button button = new Button(text); connect!("clicked")(button, member); return button; } void abortOperation() { clearAll(); display.setText(tr("####")); } bool calculate(double rightOperand, string pendingOperator) { if (pendingOperator == tr("+")) { sumSoFar += rightOperand; } else if (pendingOperator == tr("-")) { sumSoFar -= rightOperand; } else if (pendingOperator == tr("*")) { factorSoFar *= rightOperand; } else if (pendingOperator == tr("/")) { if (rightOperand == 0.0) return false; factorSoFar /= rightOperand; } return true; } double sumInMemory; double sumSoFar; double factorSoFar; string pendingAdditiveOperator; string pendingMultiplicativeOperator; bool waitingForOperand; QLineEdit display; enum { NumDigitButtons = 10 }; Button[NumDigitButtons] digitButtons; }