C++/Qt/QPushButton — различия между версиями
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Версия 14:21, 25 мая 2010
Содержание
Add clicked event for push button
#include <QApplication>
#include <QPushButton>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QPushButton *button = new QPushButton("Quit");
QObject::connect(button, SIGNAL(clicked()),&app, SLOT(quit()));
button->show();
return app.exec();
}
Button based calculator
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples 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 1.1, 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 have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef CALCULATOR_H
#define CALCULATOR_H
#include <QDialog>
QT_BEGIN_NAMESPACE
class QLineEdit;
QT_END_NAMESPACE
class Button;
class Calculator : public QDialog
{
Q_OBJECT
public:
Calculator(QWidget *parent = 0);
private slots:
void digitClicked();
void unaryOperatorClicked();
void additiveOperatorClicked();
void multiplicativeOperatorClicked();
void equalClicked();
void pointClicked();
void changeSignClicked();
void backspaceClicked();
void clear();
void clearAll();
void clearMemory();
void readMemory();
void setMemory();
void addToMemory();
private:
Button *createButton(const QString &text, const char *member);
void abortOperation();
bool calculate(double rightOperand, const QString &pendingOperator);
double sumInMemory;
double sumSoFar;
double factorSoFar;
QString pendingAdditiveOperator;
QString pendingMultiplicativeOperator;
bool waitingForOperand;
QLineEdit *display;
enum { NumDigitButtons = 10 };
Button *digitButtons[NumDigitButtons];
};
#endif
#include <QtGui>
#include <math.h>
#include "button.h"
#include "calculator.h"
Calculator::Calculator(QWidget *parent)
: QDialog(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);
QFont font = display->font();
font.setPointSize(font.pointSize() + 8);
display->setFont(font);
for (int i = 0; i < NumDigitButtons; ++i) {
digitButtons[i] = createButton(QString::number(i), SLOT(digitClicked()));
}
Button *pointButton = createButton(tr("."), SLOT(pointClicked()));
Button *changeSignButton = createButton(tr("\261"), SLOT(changeSignClicked()));
Button *backspaceButton = createButton(tr("Backspace"), SLOT(backspaceClicked()));
Button *clearButton = createButton(tr("Clear"), SLOT(clear()));
Button *clearAllButton = createButton(tr("Clear All"), SLOT(clearAll()));
Button *clearMemoryButton = createButton(tr("MC"), SLOT(clearMemory()));
Button *readMemoryButton = createButton(tr("MR"), SLOT(readMemory()));
Button *setMemoryButton = createButton(tr("MS"), SLOT(setMemory()));
Button *addToMemoryButton = createButton(tr("M+"), SLOT(addToMemory()));
Button *divisionButton = createButton(tr("\367"), SLOT(multiplicativeOperatorClicked()));
Button *timesButton = createButton(tr("\327"), SLOT(multiplicativeOperatorClicked()));
Button *minusButton = createButton(tr("-"), SLOT(additiveOperatorClicked()));
Button *plusButton = createButton(tr("+"), SLOT(additiveOperatorClicked()));
Button *squareRootButton = createButton(tr("Sqrt"), SLOT(unaryOperatorClicked()));
Button *powerButton = createButton(tr("x\262"), SLOT(unaryOperatorClicked()));
Button *reciprocalButton = createButton(tr("1/x"), SLOT(unaryOperatorClicked()));
Button *equalButton = createButton(tr("="), SLOT(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"));
}
void Calculator::digitClicked()
{
Button *clickedButton = qobject_cast<Button *>(sender());
int digitValue = clickedButton->text().toInt();
if (display->text() == "0" && digitValue == 0.0)
return;
if (waitingForOperand) {
display->clear();
waitingForOperand = false;
}
display->setText(display->text() + QString::number(digitValue));
}
void Calculator::unaryOperatorClicked()
{
Button *clickedButton = qobject_cast<Button *>(sender());
QString clickedOperator = clickedButton->text();
double operand = display->text().toDouble();
double result = 0.0;
if (clickedOperator == tr("Sqrt")) {
if (operand < 0.0) {
abortOperation();
return;
}
result = sqrt(operand);
} else if (clickedOperator == tr("x\262")) {
result = pow(operand, 2.0);
} else if (clickedOperator == tr("1/x")) {
if (operand == 0.0) {
abortOperation();
return;
}
result = 1.0 / operand;
}
display->setText(QString::number(result));
waitingForOperand = true;
}
void Calculator::additiveOperatorClicked()
{
Button *clickedButton = qobject_cast<Button *>(sender());
QString clickedOperator = clickedButton->text();
double operand = display->text().toDouble();
if (!pendingMultiplicativeOperator.isEmpty()) {
if (!calculate(operand, pendingMultiplicativeOperator)) {
abortOperation();
return;
}
display->setText(QString::number(factorSoFar));
operand = factorSoFar;
factorSoFar = 0.0;
pendingMultiplicativeOperator.clear();
}
if (!pendingAdditiveOperator.isEmpty()) {
if (!calculate(operand, pendingAdditiveOperator)) {
abortOperation();
return;
}
display->setText(QString::number(sumSoFar));
} else {
sumSoFar = operand;
}
pendingAdditiveOperator = clickedOperator;
waitingForOperand = true;
}
void Calculator::multiplicativeOperatorClicked()
{
Button *clickedButton = qobject_cast<Button *>(sender());
QString clickedOperator = clickedButton->text();
double operand = display->text().toDouble();
if (!pendingMultiplicativeOperator.isEmpty()) {
if (!calculate(operand, pendingMultiplicativeOperator)) {
abortOperation();
return;
}
display->setText(QString::number(factorSoFar));
} else {
factorSoFar = operand;
}
pendingMultiplicativeOperator = clickedOperator;
waitingForOperand = true;
}
void Calculator::equalClicked()
{
double operand = display->text().toDouble();
if (!pendingMultiplicativeOperator.isEmpty()) {
if (!calculate(operand, pendingMultiplicativeOperator)) {
abortOperation();
return;
}
operand = factorSoFar;
factorSoFar = 0.0;
pendingMultiplicativeOperator.clear();
}
if (!pendingAdditiveOperator.isEmpty()) {
if (!calculate(operand, pendingAdditiveOperator)) {
abortOperation();
return;
}
pendingAdditiveOperator.clear();
} else {
sumSoFar = operand;
}
display->setText(QString::number(sumSoFar));
sumSoFar = 0.0;
waitingForOperand = true;
}
void Calculator::pointClicked()
{
if (waitingForOperand)
display->setText("0");
if (!display->text().contains("."))
display->setText(display->text() + tr("."));
waitingForOperand = false;
}
void Calculator::changeSignClicked()
{
QString text = display->text();
double value = text.toDouble();
if (value > 0.0) {
text.prepend(tr("-"));
} else if (value < 0.0) {
text.remove(0, 1);
}
display->setText(text);
}
void Calculator::backspaceClicked()
{
if (waitingForOperand)
return;
QString text = display->text();
text.chop(1);
if (text.isEmpty()) {
text = "0";
waitingForOperand = true;
}
display->setText(text);
}
void Calculator::clear()
{
if (waitingForOperand)
return;
display->setText("0");
waitingForOperand = true;
}
void Calculator::clearAll()
{
sumSoFar = 0.0;
factorSoFar = 0.0;
pendingAdditiveOperator.clear();
pendingMultiplicativeOperator.clear();
display->setText("0");
waitingForOperand = true;
}
void Calculator::clearMemory()
{
sumInMemory = 0.0;
}
void Calculator::readMemory()
{
display->setText(QString::number(sumInMemory));
waitingForOperand = true;
}
void Calculator::setMemory()
{
equalClicked();
sumInMemory = display->text().toDouble();
}
void Calculator::addToMemory()
{
equalClicked();
sumInMemory += display->text().toDouble();
}
Button *Calculator::createButton(const QString &text, const char *member)
{
Button *button = new Button(text);
connect(button, SIGNAL(clicked()), this, member);
return button;
}
void Calculator::abortOperation()
{
clearAll();
display->setText(tr("####"));
}
bool Calculator::calculate(double rightOperand, const QString &pendingOperator)
{
if (pendingOperator == tr("+")) {
sumSoFar += rightOperand;
} else if (pendingOperator == tr("-")) {
sumSoFar -= rightOperand;
} else if (pendingOperator == tr("\327")) {
factorSoFar *= rightOperand;
} else if (pendingOperator == tr("\367")) {
if (rightOperand == 0.0)
return false;
factorSoFar /= rightOperand;
}
return true;
}
#ifndef BUTTON_H
#define BUTTON_H
#include <QToolButton>
class Button : public QToolButton
{
Q_OBJECT
public:
Button(const QString &text, QWidget *parent = 0);
QSize sizeHint() const;
};
#endif
#include <QtGui>
#include "button.h"
Button::Button(const QString &text, QWidget *parent)
: QToolButton(parent)
{
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
setText(text);
}
QSize Button::sizeHint() const
{
QSize size = QToolButton::sizeHint();
size.rheight() += 20;
size.rwidth() = qMax(size.width(), size.height());
return size;
}
#include <QApplication>
#include "calculator.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Calculator calc;
calc.show();
return app.exec();
}
Calculator with push buttons
Foundations of Qt Development\Chapter06\composed\main.cpp
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of APress nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <QApplication>
#include "numerickeypad.h"
#include <QWidget>
#include <QVBoxLayout>
#include <QLabel>
int main( int argc, char **argv )
{
QApplication app( argc, argv );
QWidget widget;
QVBoxLayout layout( &widget );
NumericKeypad pad;
layout.addWidget( &pad );
QLabel label;
layout.addWidget( &label );
QObject::connect( &pad, SIGNAL(textChanged(QString)), &label, SLOT(setText(QString)) );
widget.show();
return app.exec();
}
Foundations of Qt Development\Chapter06\composed\numerickeypad.cpp
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of APress nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <QGridLayout>
#include <QLineEdit>
#include <QPushButton>
#include <QSignalMapper>
#include "numerickeypad.h"
NumericKeypad::NumericKeypad( QWidget *parent )
{
QGridLayout *layout = new QGridLayout( this );
m_lineEdit = new QLineEdit();
m_lineEdit->setAlignment( Qt::AlignRight );
QPushButton *button0 = new QPushButton( tr("0") );
QPushButton *button1 = new QPushButton( tr("1") );
QPushButton *button2 = new QPushButton( tr("2") );
QPushButton *button3 = new QPushButton( tr("3") );
QPushButton *button4 = new QPushButton( tr("4") );
QPushButton *button5 = new QPushButton( tr("5") );
QPushButton *button6 = new QPushButton( tr("6") );
QPushButton *button7 = new QPushButton( tr("7") );
QPushButton *button8 = new QPushButton( tr("8") );
QPushButton *button9 = new QPushButton( tr("9") );
QPushButton *buttonDot = new QPushButton( tr(".") );
QPushButton *buttonClear = new QPushButton( tr("C") );
layout->addWidget( m_lineEdit, 0, 0, 1, 3 );
layout->addWidget( button1, 1, 0 );
layout->addWidget( button2, 1, 1 );
layout->addWidget( button3, 1, 2 );
layout->addWidget( button4, 2, 0 );
layout->addWidget( button5, 2, 1 );
layout->addWidget( button6, 2, 2 );
layout->addWidget( button7, 3, 0 );
layout->addWidget( button8, 3, 1 );
layout->addWidget( button9, 3, 2 );
layout->addWidget( button0, 4, 0 );
layout->addWidget( buttonDot, 4, 1 );
layout->addWidget( buttonClear, 4, 2 );
QSignalMapper *mapper = new QSignalMapper( this );
mapper->setMapping( button0, "0" );
mapper->setMapping( button1, "1" );
mapper->setMapping( button2, "2" );
mapper->setMapping( button3, "3" );
mapper->setMapping( button4, "4" );
mapper->setMapping( button5, "5" );
mapper->setMapping( button6, "6" );
mapper->setMapping( button7, "7" );
mapper->setMapping( button8, "8" );
mapper->setMapping( button9, "9" );
mapper->setMapping( buttonDot, "." );
connect( button0, SIGNAL(clicked()), mapper, SLOT(map()) );
connect( button1, SIGNAL(clicked()), mapper, SLOT(map()) );
connect( button2, SIGNAL(clicked()), mapper, SLOT(map()) );
connect( button3, SIGNAL(clicked()), mapper, SLOT(map()) );
connect( button4, SIGNAL(clicked()), mapper, SLOT(map()) );
connect( button5, SIGNAL(clicked()), mapper, SLOT(map()) );
connect( button6, SIGNAL(clicked()), mapper, SLOT(map()) );
connect( button7, SIGNAL(clicked()), mapper, SLOT(map()) );
connect( button8, SIGNAL(clicked()), mapper, SLOT(map()) );
connect( button9, SIGNAL(clicked()), mapper, SLOT(map()) );
connect( buttonDot, SIGNAL(clicked()), mapper, SLOT(map()) );
connect( mapper, SIGNAL(mapped(QString)), this, SLOT(buttonClicked(QString)) );
connect( buttonClear, SIGNAL(clicked()), m_lineEdit, SLOT(clear()) );
connect( m_lineEdit, SIGNAL(textChanged(QString)), this, SLOT(setText(QString)) );
}
const QString NumericKeypad::text() const
{
return m_text;
}
void NumericKeypad::buttonClicked( const QString &newText )
{
setText( m_text + newText );
}
void NumericKeypad::setText( const QString &newText )
{
if( newText == m_text )
return;
m_text = newText;
m_lineEdit->setText( m_text );
emit textChanged( m_text );
}
Foundations of Qt Development\Chapter06\composed\numerickeypad.h
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of APress nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef NUMERICKEYPAD_H
#define NUMERICKEYPAD_H
#include <QWidget>
class QLineEdit;
class NumericKeypad : public QWidget
{
Q_OBJECT
public:
NumericKeypad( QWidget *parent = 0 );
const QString text() const;
public slots:
void setText( const QString &text );
signals:
void textChanged( const QString &text );
private slots:
void buttonClicked( const QString &text );
private:
QLineEdit *m_lineEdit;
QString m_text;
};
#endif // NUMERICKEYPAD_H
Create PushButton and add to window
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation 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 1.1, 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 have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtGui>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
{
QWidget *window = new QWidget;
QPushButton *button1 = new QPushButton("One");
QPushButton *button2 = new QPushButton("Two");
QPushButton *button3 = new QPushButton("Three");
QPushButton *button4 = new QPushButton("Four");
QPushButton *button5 = new QPushButton("Five");
QHBoxLayout *layout = new QHBoxLayout;
layout->addWidget(button1);
layout->addWidget(button2);
layout->addWidget(button3);
layout->addWidget(button4);
layout->addWidget(button5);
window->setLayout(layout);
window->show();
}
return app.exec();
}
extends QPushButton
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation 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 1.1, 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 have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtGui>
#include <QApplication>
class MyPushButton : public QPushButton
{
public:
MyPushButton(QWidget *parent = 0);
void paintEvent(QPaintEvent *);
};
MyPushButton::MyPushButton(QWidget *parent)
: QPushButton(parent)
{
}
void MyPushButton::paintEvent(QPaintEvent *)
{
QStyleOptionButton option;
option.initFrom(this);
option.state = isDown() ? QStyle::State_Sunken : QStyle::State_Raised;
if (isDefault())
option.features |= QStyleOptionButton::DefaultButton;
option.text = text();
option.icon = icon();
QPainter painter(this);
style()->drawControl(QStyle::CE_PushButton, &option, &painter, this);
}
class MyStyle : public QStyle
{
public:
MyStyle();
void drawPrimitive(PrimitiveElement element, const QStyleOption *option,
QPainter *painter, const QWidget *widget);
};
MyStyle::MyStyle()
{
QStyleOptionFrame *option;
if (const QStyleOptionFrame *frameOption =
qstyleoption_cast<const QStyleOptionFrame *>(option)) {
QStyleOptionFrameV2 frameOptionV2(*frameOption);
// draw the frame using frameOptionV2
}
if (const QStyleOptionProgressBar *progressBarOption =
qstyleoption_cast<const QStyleOptionProgressBar *>(option)) {
QStyleOptionProgressBarV2 progressBarV2(*progressBarOption);
// draw the progress bar using progressBarV2
}
if (const QStyleOptionTab *tabOption =
qstyleoption_cast<const QStyleOptionTab *>(option)) {
QStyleOptionTabV2 tabV2(*tabOption);
// draw the tab using tabV2
}
}
void MyStyle::drawPrimitive(PrimitiveElement element,
const QStyleOption *option,
QPainter *painter,
const QWidget *widget)
{
if (element == PE_FrameFocusRect) {
const QStyleOptionFocusRect *focusRectOption =
qstyleoption_cast<const QStyleOptionFocusRect *>(option);
if (focusRectOption) {
// ...
}
}
// ...
}
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MyPushButton button;
button.show();
return app.exec();
}
toggle button demo
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of APress nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <QPushButton>
#include <QHBoxLayout>
#include <QMessageBox>
#include <QApplication>
#include <QDialog>
class QPushButton;
class ButtonDialog : public QDialog
{
Q_OBJECT
public:
ButtonDialog( QWidget *parent=0 );
private slots:
void buttonClicked();
void buttonToggled();
private:
QPushButton *clickButton;
QPushButton *toggleButton;
};
ButtonDialog::ButtonDialog( QWidget *parent ) : QDialog( parent )
{
clickButton = new QPushButton( "Click me!", this );
toggleButton = new QPushButton( "Toggle me!", this );
toggleButton->setCheckable( true );
QHBoxLayout *layout = new QHBoxLayout( this );
layout->addWidget( clickButton );
layout->addWidget( toggleButton );
connect( clickButton, SIGNAL(clicked()), this, SLOT(buttonClicked()) );
connect( toggleButton, SIGNAL(clicked()), this, SLOT(buttonToggled()) );
}
void ButtonDialog::buttonClicked()
{
QMessageBox::information( this, "Clicked!", "The button was clicked!" );
}
void ButtonDialog::buttonToggled()
{
QMessageBox::information( this, "Toggled!", QString("The button is %1!").arg(toggleButton->isChecked()?"pressed":"released") );
}
int main( int argc, char **argv )
{
QApplication app( argc, argv );
ButtonDialog dlg;
dlg.show();
return app.exec();
}