QSlider的用法

#include <QtWidgets>

#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);
}