Source code for tutorial 12: lcdrange.cpp

/****************************************************************
**
** Implementation of LCDRange class, Qt tutorial 12
**
****************************************************************/

#include "lcdrange.h"

#include <qslider.h>
#include <qlcdnumber.h>
#include <qlabel.h>

LCDRange::LCDRange( QWidget *parent, const char *name )
        : QVBox( parent, name )
{
    init();
}

LCDRange::LCDRange( const char *s, QWidget *parent, const char *name )
        : QVBox( parent, name )
{
    init();
    setText( s );
}

void LCDRange::init()
{
    QLCDNumber *lcd  = new QLCDNumber( 2, this, "lcd"  );
    slider = new QSlider( 0, 99,        // range
                          10,           // page steps
                          0,            // inital value
                          Horizontal,   // orientation
                          this, "slider" );
    label  = new QLabel( " ", this, "label"  );
    label->setAlignment( AlignHCenter );
    label->setFixedHeight( label->sizeHint().height() );

    connect( slider, SIGNAL(valueChanged(int)), lcd, SLOT(display(int)) );
    connect( slider, SIGNAL(valueChanged(int)), SIGNAL(valueChanged(int)) );
}

int LCDRange::value() const
{
    return slider->value();
}

const char *LCDRange::text() const
{
    return label->text();
}

void LCDRange::setValue( int value )
{
    slider->setValue( value );
}

void LCDRange::setRange( int minVal, int maxVal )
{
    if ( minVal < 0 || maxVal > 99 || minVal > maxVal ) {
        qWarning( "LCDRange::setRange(%d,%d)\n"
                 "\tRange must be 0..99\n"
                 "\tand minVal must not be greater than maxVal",
                 minVal, maxVal );
        return;
    }
    slider->setRange( minVal, maxVal );
}

void LCDRange::setText( const char *s )
{
    label->setText( s );
}