Qt tutorial - t9/lcdrange.cpp

# Source code for tutorial 9: lcdrange.cpp

    /****************************************************************
    **
    ** Implementation of LCDRange class, Qt tutorial 9
    **
    ****************************************************************/

    #include "lcdrange.h"

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

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

    void LCDRange::resizeEvent( QResizeEvent * )
    {
        lcd->resize( width(), height() - 16 - 5 );
        sBar->setGeometry( 0, lcd->height() + 5, width(), 16 );
    }