Source code for tutorial 10: lcdrange.cpp

/****************************************************************
**
** Implementation of LCDRange class, Qt tutorial 10
**
****************************************************************/

#include "lcdrange.h"

#include <qscrollbar.h>
#include <qlcdnumber.h>
#include <qlayout.h>

LCDRange::LCDRange( QWidget *parent, const char *name )
        : QWidget( parent, name )
{
    QLCDNumber *lcd  = new QLCDNumber( 2, this, "lcd"  );
    sBar = new QScrollBar( 0, 99,       // range
                           1, 10,       // line/page steps
                           0,   // inital value
                           QScrollBar::Horizontal,      // orientation
                           this, "scrollbar" );
    QVBoxLayout *vbox = new QVBoxLayout( this, 5 );
    vbox->addWidget( lcd );
    vbox->addWidget( sBar );

    connect( sBar, SIGNAL(valueChanged(int)), lcd, SLOT(display(int)) );
    connect( sBar, SIGNAL(valueChanged(int)), SIGNAL(valueChanged(int)) );

}

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

void LCDRange::setValue( int value )
{
    sBar->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; 
    }
    sBar->setRange( minVal, maxVal );    
}