File: t12-lcdrange-cpp.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta name="robots" content="noindex"><title>Qt tutorial - t12/lcdrange.cpp</title>
</head><body bgcolor="#ffffff">
<p>
<a href=index.html><img width=122 height=65 src=qtlogo.jpg alt="Qt logo" align=left border=0></a>
<center><img src=dochead.gif width=472 height=27></center>
<br clear=all>
<p>
<h1 align=center>Source code for <a href="t12.html">tutorial 12</a>: lcdrange.cpp</h1><br clear="all">
<hr>
<pre>/****************************************************************
**
** Implementation of LCDRange class, Qt tutorial 12
**
****************************************************************/

#include "lcdrange.h"

#include &lt;<a href="qscrollbar-h.html">qscrollbar.h</a>&gt;
#include &lt;<a href="qlcdnumber-h.html">qlcdnumber.h</a>&gt;
#include &lt;<a href="qlabel-h.html">qlabel.h</a>&gt;

LCDRange::LCDRange( <a href="qwidget.html">QWidget</a> *parent, const char *name )
        : <a href="qwidget.html">QWidget</a>( parent, name )
{
    <a href=#354>init</a>();
}

LCDRange::LCDRange( const char *s, QWidget *parent, const char *name )
        : <a href="qwidget.html">QWidget</a>( parent, name )
{
    <a href=#354>init</a>();
    <a href=#359>setText</a>( s );
}

void <a name="354"></a>LCDRange::init()
{
    lcd  = new <a href="qlcdnumber.html">QLCDNumber</a>( 2, this, "lcd"  );
    lcd-&gt;move( 0, 0 );
    sBar = new <a href="qscrollbar.html">QScrollBar</a>( 0, 99,                       // range
                           1, 10,                       // line/page steps
                           0,                           // inital value
                           QScrollBar::Horizontal,      // orientation
                           this, "scrollbar" );
    label  = new <a href="qlabel.html">QLabel</a>( this, "label"  );
    label-&gt;setAlignment( AlignCenter );
    <a href="qobject.html#f2">connect</a>( sBar, SIGNAL(valueChanged(int)), lcd, SLOT(display(int)) );
    <a href="qobject.html#f2">connect</a>( sBar, SIGNAL(valueChanged(int)), SIGNAL(valueChanged(int)) );

}

int <a name="355"></a>LCDRange::value() const
{
    return sBar-&gt;value();
}

const char *<a name="356"></a>LCDRange::text() const
{
    return label-&gt;text();
}

void <a name="357"></a>LCDRange::setValue( int value )
{
    sBar-&gt;setValue( value );
}

void <a name="358"></a>LCDRange::setRange( int minVal, int maxVal )
{
    if ( minVal &lt; 0 || maxVal &gt; 99 || minVal &gt; maxVal ) {
        <a href="qapplication.html#j5">warning</a>( "<a name="358"></a>LCDRange::setRange(%d,%d)\n"
                 "\tRange must be 0..99\n"
                 "\tand minVal must not be greater than maxVal",
                 minVal, maxVal );
        return;
    }
    sBar-&gt;setRange( minVal, maxVal );
}

void <a name="359"></a>LCDRange::setText( const char *s )
{
    label-&gt;setText( s );
}

void <a name="360"></a>LCDRange::resizeEvent( <a href="qresizeevent.html">QResizeEvent</a> * )
{
    lcd-&gt;resize( <a href="qwidget.html#b9">width</a>(), <a href="qwidget.html#c0">height</a>() - 41 - 5 );
    sBar-&gt;setGeometry( 0, lcd-&gt;height() + 5, <a href="qwidget.html#b9">width</a>(), 16 );
    label-&gt;setGeometry( 0, lcd-&gt;height() + 16 + 5, <a href="qwidget.html#b9">width</a>(), 20 );
}
</pre>
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