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 *event )
{
if ( event->type() == QEvent::Wheel )
{
const QWheelEvent *we = static_cast<QWheelEvent *>( event );
QWheelEvent wheelEvent( QPoint( 5, 5 ), we->delta(),
we->buttons(), we->modifiers(),
we->orientation() );
QApplication::sendEvent( this, &wheelEvent );
return true;
}
return QwtWheel::eventFilter( object, event );
}
};
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->setInverted( true );
d_wheel->setRange( min, max );
d_wheel->setSingleStep( stepSize );
d_wheel->setPageStepCount( 5 );
d_wheel->setFixedHeight( 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::setTheme( const QColor &color )
{
d_wheel->setPalette( color );
}
QColor WheelBox::theme() const
{
return d_wheel->palette().color( QPalette::Window );
}
void WheelBox::setValue( double value )
{
d_wheel->setValue( value );
d_number->display( value );
}
double WheelBox::value() const
{
return d_wheel->value();
}