в 14:21, 25 мая 2010

2010-05-25T14:21:06Z

Admin: 1 версия: Импорт контента...

2010-05-25T10:24:24Z

1 версия: Импорт контента...

Новая страница

==Add slider to window==

<source lang="cpp">
#include <QApplication>
#include <QHBoxLayout>
#include <QSlider>
#include <QSpinBox>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QWidget *window = new QWidget;
window->setWindowTitle("Enter Your Age");
QSpinBox *spinBox = new QSpinBox;
QSlider *slider = new QSlider(Qt::Horizontal);
spinBox->setRange(0, 130);
slider->setRange(0, 130);
QObject::connect(spinBox, SIGNAL(valueChanged(int)),slider, SLOT(setValue(int)));
QObject::connect(slider, SIGNAL(valueChanged(int)),spinBox, SLOT(setValue(int)));
spinBox->setValue(35);
QHBoxLayout *layout = new QHBoxLayout;
layout->addWidget(spinBox);
layout->addWidget(slider);
window->setLayout(layout);
window->show();
return app.exec();
}

</source>

==Add value change signal for slider==

<source lang="cpp">
#include <QApplication>
#include <QHBoxLayout>
#include <QSlider>
#include <QSpinBox>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QWidget *window = new QWidget;
window->setWindowTitle("Enter Your Age");
QSpinBox *spinBox = new QSpinBox;
QSlider *slider = new QSlider(Qt::Horizontal);
spinBox->setRange(0, 130);
slider->setRange(0, 130);
QObject::connect(spinBox, SIGNAL(valueChanged(int)),slider, SLOT(setValue(int)));
QObject::connect(slider, SIGNAL(valueChanged(int)),spinBox, SLOT(setValue(int)));
spinBox->setValue(35);
QHBoxLayout *layout = new QHBoxLayout;
layout->addWidget(spinBox);
layout->addWidget(slider);
window->setLayout(layout);
window->show();
return app.exec();
}

</source>

==Set range for slider==

<source lang="cpp">
#include <QApplication>
#include <QHBoxLayout>
#include <QSlider>
#include <QSpinBox>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QWidget *window = new QWidget;
window->setWindowTitle("Enter Your Age");
QSpinBox *spinBox = new QSpinBox;
QSlider *slider = new QSlider(Qt::Horizontal);
spinBox->setRange(0, 130);
slider->setRange(0, 130);
QObject::connect(spinBox, SIGNAL(valueChanged(int)),slider, SLOT(setValue(int)));
QObject::connect(slider, SIGNAL(valueChanged(int)),spinBox, SLOT(setValue(int)));
spinBox->setValue(35);
QHBoxLayout *layout = new QHBoxLayout;
layout->addWidget(spinBox);
layout->addWidget(slider);
window->setLayout(layout);
window->show();
return app.exec();
}

</source>

==Slider group==

<source lang="cpp">
/****************************************************************************
**
** 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 SLIDERSGROUP_H
#define SLIDERSGROUP_H
#include <QGroupBox>
QT_BEGIN_NAMESPACE
class QDial;
class QScrollBar;
class QSlider;
QT_END_NAMESPACE

class SlidersGroup : public QGroupBox
{
Q_OBJECT
public:
SlidersGroup(Qt::Orientation orientation, const QString &title,
QWidget *parent = 0);
signals:
void valueChanged(int value);
public slots:
void setValue(int value);
void setMinimum(int value);
void setMaximum(int value);
void invertAppearance(bool invert);
void invertKeyBindings(bool invert);
private:
QSlider *slider;
QScrollBar *scrollBar;
QDial *dial;
};

#endif

#include <QtGui>
#include "slidersgroup.h"

SlidersGroup::SlidersGroup(Qt::Orientation orientation, const QString &title,
QWidget *parent)
: QGroupBox(title, parent)
{
slider = new QSlider(orientation);
slider->setFocusPolicy(Qt::StrongFocus);
slider->setTickPosition(QSlider::TicksBothSides);
slider->setTickInterval(10);
slider->setSingleStep(1);
scrollBar = new QScrollBar(orientation);
scrollBar->setFocusPolicy(Qt::StrongFocus);
dial = new QDial;
dial->setFocusPolicy(Qt::StrongFocus);
connect(slider, SIGNAL(valueChanged(int)), scrollBar, SLOT(setValue(int)));
connect(scrollBar, SIGNAL(valueChanged(int)), dial, SLOT(setValue(int)));
connect(dial, SIGNAL(valueChanged(int)), slider, SLOT(setValue(int)));

connect(dial, SIGNAL(valueChanged(int)), this, SIGNAL(valueChanged(int)));

QBoxLayout::Direction direction;

if (orientation == Qt::Horizontal)
direction = QBoxLayout::TopToBottom;
else
direction = QBoxLayout::LeftToRight;
QBoxLayout *slidersLayout = new QBoxLayout(direction);
slidersLayout->addWidget(slider);
slidersLayout->addWidget(scrollBar);
slidersLayout->addWidget(dial);
setLayout(slidersLayout);
}

void SlidersGroup::setValue(int value)

{
slider->setValue(value);
}

void SlidersGroup::setMinimum(int value)

{
slider->setMinimum(value);
scrollBar->setMinimum(value);
dial->setMinimum(value);
}

void SlidersGroup::setMaximum(int value)

{
slider->setMaximum(value);
scrollBar->setMaximum(value);
dial->setMaximum(value);
}

void SlidersGroup::invertAppearance(bool invert)

{
slider->setInvertedAppearance(invert);
scrollBar->setInvertedAppearance(invert);
dial->setInvertedAppearance(invert);
}

void SlidersGroup::invertKeyBindings(bool invert)

{
slider->setInvertedControls(invert);
scrollBar->setInvertedControls(invert);
dial->setInvertedControls(invert);
}

#ifndef WINDOW_H
#define WINDOW_H
#include <QWidget>
QT_BEGIN_NAMESPACE
class QCheckBox;
class QComboBox;
class QGroupBox;
class QLabel;
class QSpinBox;
class QStackedWidget;
QT_END_NAMESPACE
class SlidersGroup;

class Window : public QWidget
{
Q_OBJECT
public:
Window();
private:
void createControls(const QString &title);
SlidersGroup *horizontalSliders;
SlidersGroup *verticalSliders;
QStackedWidget *stackedWidget;
QGroupBox *controlsGroup;
QLabel *minimumLabel;
QLabel *maximumLabel;
QLabel *valueLabel;
QCheckBox *invertedAppearance;
QCheckBox *invertedKeyBindings;
QSpinBox *minimumSpinBox;
QSpinBox *maximumSpinBox;
QSpinBox *valueSpinBox;
QComboBox *orientationCombo;
};

#endif

#include <QtGui>
#include "slidersgroup.h"
#include "window.h"

Window::Window()
{
horizontalSliders = new SlidersGroup(Qt::Horizontal, tr("Horizontal"));
verticalSliders = new SlidersGroup(Qt::Vertical, tr("Vertical"));
stackedWidget = new QStackedWidget;
stackedWidget->addWidget(horizontalSliders);
stackedWidget->addWidget(verticalSliders);
createControls(tr("Controls"));

connect(horizontalSliders, SIGNAL(valueChanged(int)),

verticalSliders, SLOT(setValue(int)));
connect(verticalSliders, SIGNAL(valueChanged(int)),
valueSpinBox, SLOT(setValue(int)));
connect(valueSpinBox, SIGNAL(valueChanged(int)),
horizontalSliders, SLOT(setValue(int)));
QHBoxLayout *layout = new QHBoxLayout;
layout->addWidget(controlsGroup);
layout->addWidget(stackedWidget);
setLayout(layout);
minimumSpinBox->setValue(0);
maximumSpinBox->setValue(20);
valueSpinBox->setValue(5);
setWindowTitle(tr("Sliders"));
}

void Window::createControls(const QString &title)

{
controlsGroup = new QGroupBox(title);
minimumLabel = new QLabel(tr("Minimum value:"));
maximumLabel = new QLabel(tr("Maximum value:"));
valueLabel = new QLabel(tr("Current value:"));
invertedAppearance = new QCheckBox(tr("Inverted appearance"));
invertedKeyBindings = new QCheckBox(tr("Inverted key bindings"));

minimumSpinBox = new QSpinBox;

minimumSpinBox->setRange(-100, 100);
minimumSpinBox->setSingleStep(1);
maximumSpinBox = new QSpinBox;
maximumSpinBox->setRange(-100, 100);
maximumSpinBox->setSingleStep(1);
valueSpinBox = new QSpinBox;
valueSpinBox->setRange(-100, 100);
valueSpinBox->setSingleStep(1);
orientationCombo = new QComboBox;
orientationCombo->addItem(tr("Horizontal slider-like widgets"));
orientationCombo->addItem(tr("Vertical slider-like widgets"));

connect(orientationCombo, SIGNAL(activated(int)),

stackedWidget, SLOT(setCurrentIndex(int)));
connect(minimumSpinBox, SIGNAL(valueChanged(int)),
horizontalSliders, SLOT(setMinimum(int)));
connect(minimumSpinBox, SIGNAL(valueChanged(int)),
verticalSliders, SLOT(setMinimum(int)));
connect(maximumSpinBox, SIGNAL(valueChanged(int)),
horizontalSliders, SLOT(setMaximum(int)));
connect(maximumSpinBox, SIGNAL(valueChanged(int)),
verticalSliders, SLOT(setMaximum(int)));
connect(invertedAppearance, SIGNAL(toggled(bool)),
horizontalSliders, SLOT(invertAppearance(bool)));
connect(invertedAppearance, SIGNAL(toggled(bool)),
verticalSliders, SLOT(invertAppearance(bool)));
connect(invertedKeyBindings, SIGNAL(toggled(bool)),
horizontalSliders, SLOT(invertKeyBindings(bool)));
connect(invertedKeyBindings, SIGNAL(toggled(bool)),
verticalSliders, SLOT(invertKeyBindings(bool)));
QGridLayout *controlsLayout = new QGridLayout;
controlsLayout->addWidget(minimumLabel, 0, 0);
controlsLayout->addWidget(maximumLabel, 1, 0);
controlsLayout->addWidget(valueLabel, 2, 0);
controlsLayout->addWidget(minimumSpinBox, 0, 1);
controlsLayout->addWidget(maximumSpinBox, 1, 1);
controlsLayout->addWidget(valueSpinBox, 2, 1);
controlsLayout->addWidget(invertedAppearance, 0, 2);
controlsLayout->addWidget(invertedKeyBindings, 1, 2);
controlsLayout->addWidget(orientationCombo, 3, 0, 1, 3);
controlsGroup->setLayout(controlsLayout);
}

#include <QApplication>
#include "window.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Window window;
window.show();
return app.exec();
}

</source>

==Using QSlider to control custom component==

<source lang="cpp">

Foundations of Qt Development\Chapter06\circlebar\circlebar.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
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <QPaintEvent>
#include <QWheelEvent>
#include <QPainter>
#include "circlebar.h"
CircleBar::CircleBar( int value, QWidget *parent ) : QWidget( parent )
{
m_value = value;

QSizePolicy policy( QSizePolicy::Preferred, QSizePolicy::Preferred );
policy.setHeightForWidth( true );
setSizePolicy( policy );
}
int CircleBar::heightForWidth( int width ) const
{
return width;
}
QSize CircleBar::sizeHint() const
{
return QSize( 100, 100 );
}
int CircleBar::value() const
{
return m_value;
}
void CircleBar::setValue( int value )
{
if( value < 0 )
value = 0;

if( value > 100 )
value = 100;

if( m_value == value )
return;

m_value = value;
update();
emit valueChanged( m_value );
}
void CircleBar::paintEvent( QPaintEvent *event )
{
int radius = width()/2;
double factor = m_value/100.0;

QPainter p( this );
p.setPen( Qt::black );
p.drawEllipse( 0, 0, width()-1, width()-1 );
p.setBrush( Qt::black );
p.drawEllipse( int(radius*(1.0-factor)), int(radius*(1.0-factor)), int((width()-1)*factor)+1, int((width()-1)*factor)+1 );
}
void CircleBar::wheelEvent( QWheelEvent *event )
{
event->accept();
setValue( value() + event->delta()/20 );
}

Foundations of Qt Development\Chapter06\circlebar\circlebar.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 CIRCLEBAR_H
#define CIRCLEBAR_H
#include <QWidget>
class CircleBar : public QWidget
{
Q_OBJECT
public:
CircleBar( int value = 0, QWidget *parent = 0 );

int value() const;

int heightForWidth( int ) const;
QSize sizeHint() const;
public slots:
void setValue( int );

signals:
void valueChanged( int );

protected:
void paintEvent( QPaintEvent* );
void wheelEvent( QWheelEvent* );

private:
int m_value;
};
#endif // CIRCLEBAR_H

Foundations of Qt Development\Chapter06\circlebar\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
* * 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 <QSlider>
#include <QVBoxLayout>
#include "circlebar.h"
int main( int argc, char **argv )
{
QApplication app( argc, argv );

QWidget base;
QVBoxLayout layout( &base );

CircleBar bar;
QSlider slider( Qt::Horizontal );

layout.addWidget( &bar );
layout.addWidget( &slider );

QObject::connect( &slider, SIGNAL(valueChanged(int)), &bar, SLOT(setValue(int)) );
QObject::connect( &bar, SIGNAL(valueChanged(int)), &slider, SLOT(setValue(int)) );

base.show();

return app.exec();
}

</source>

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