wheelbox.cpp
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#include "wheelbox.h"
#include <qwt_wheel.h>
#include <qlcdnumber.h>
#include <qlabel.h>
#include <qlayout.h>
#include <qevent.h>
#include <qapplication.h>
class Wheel: public QwtWheel
{
public:
Wheel(WheelBox *parent):
QwtWheel(parent)
{
setFocusPolicy(Qt::WheelFocus);
parent->installEventFilter(this);
}
virtual bool eventFilter(QObject *object, QEvent *ev)
{
if ( ev->type() == QEvent::Wheel )
{
QWheelEvent *we = (QWheelEvent *)ev;
QWheelEvent wheelEvent(QPoint(5, 5), we->delta(),
we->buttons(), we->modifiers(),
we->orientation());
QApplication::sendEvent(this, &wheelEvent);
return true;
}
return QwtWheel::eventFilter(object, ev);
}
};
WheelBox::WheelBox(const QString &title,
double min, double max, double stepSize, QWidget *parent):
QWidget(parent)
{
d_number = new QLCDNumber(this);
d_number->setSegmentStyle(QLCDNumber::Filled);
d_number->setAutoFillBackground(true);
d_number->setFixedHeight(d_number->sizeHint().height() * 2 );
d_number->setFocusPolicy(Qt::WheelFocus);
QPalette pal(Qt::black);
pal.setColor(QPalette::WindowText, Qt::green);
d_number->setPalette(pal);
d_wheel = new Wheel(this);
d_wheel->setOrientation(Qt::Vertical);
d_wheel->setRange(min, max, stepSize);
d_wheel->setFixedSize(
qRound(d_number->height() / 2.5), d_number->height());
d_number->setFocusProxy(d_wheel);
QFont font("Helvetica", 10);
font.setBold(true);
d_label = new QLabel(title, this);
d_label->setFont(font);
QHBoxLayout *hLayout = new QHBoxLayout;
hLayout->setContentsMargins(0, 0, 0, 0);
hLayout->setSpacing(2);
hLayout->addWidget(d_number, 10);
hLayout->addWidget(d_wheel);
QVBoxLayout *vLayout = new QVBoxLayout(this);
vLayout->addLayout(hLayout, 10);
vLayout->addWidget(d_label, 0, Qt::AlignTop | Qt::AlignHCenter);
connect(d_wheel, SIGNAL(valueChanged(double)),
d_number, SLOT(display(double)));
connect(d_wheel, SIGNAL(valueChanged(double)),
this, SIGNAL(valueChanged(double)));
}
void WheelBox::setValue(double value)
{
d_wheel->setValue(value);
d_number->display(value);
}
double WheelBox::value() const
{
return d_wheel->value();
}