File: rot13-rot13-cpp.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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Qt Toolkit - rot13/rot13.cpp example file
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<h1 align=center>Rot13</h1><br clear="all">

  In this example you can enter a text in one Mulitilineedit widget
  and it is displayed in the edit widget at the right transformed using
  the rot13 algorithm.

  <hr>

  Header file: <pre>/****************************************************************************
** &#36;Id&#58; qt/examples/rot13/rot13.h   2.3.2   edited 2001-01-26 $
**
** Definition of something or other
**
** Created : 979899
**
** Copyright (C) 1997 by Trolltech AS.  All rights reserved.
**
** This file is part of an example program for Qt.  This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/

#ifndef ROT13_H
#define ROT13_H

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

class QMultiLineEdit;

class Rot13: public QWidget {
    Q_OBJECT
public:
    Rot13();

    <a href="qstring.html">QString</a> rot13( const QString &amp; ) const;

private slots:
    void changeLeft();
    void changeRight();

private:
    <a href="qmultilineedit.html">QMultiLineEdit</a> * left, * right;
};

#endif
</pre>


  <hr>

  Implementation:
<pre>/****************************************************************************
** &#36;Id&#58; qt/examples/rot13/rot13.cpp   2.3.2   edited 2001-06-12 $
**
** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
**
** This file is part of an example program for Qt.  This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/

#include "rot13.h"

#include &lt;<a name="qmultilineedit.h"></a><a href="qmultilineedit-h.html">qmultilineedit.h</a>&gt;
#include &lt;<a name="qpushbutton.h"></a><a href="qpushbutton-h.html">qpushbutton.h</a>&gt;
#include &lt;<a name="qapplication.h"></a><a href="qapplication-h.html">qapplication.h</a>&gt;
#include &lt;<a name="qlayout.h"></a><a href="qlayout-h.html">qlayout.h</a>&gt;

Rot13::Rot13()
{
    left = new <a name="QMultiLineEdit"></a><a href="qmultilineedit.html">QMultiLineEdit</a>( this, "left" );
    right = new <a href="qmultilineedit.html">QMultiLineEdit</a>( this, "right" );
    <a name="connect"></a><a href="qobject.html#7f8e37">connect</a>( left, SIGNAL(textChanged()), this, SLOT(<a name="changeRight"></a><a href="#336">changeRight</a>()) );
    <a href="qobject.html#7f8e37">connect</a>( right, SIGNAL(textChanged()), this, SLOT(<a name="changeLeft"></a><a href="#335">changeLeft</a>()) );

    <a name="QPushButton"></a><a href="qpushbutton.html">QPushButton</a> * quit = new <a href="qpushbutton.html">QPushButton</a>( "&amp;Quit", this );
    quit-&gt;<a name="setFocusPolicy"></a><a href="qwidget.html#f92b0f">setFocusPolicy</a>( NoFocus );
    <a href="qobject.html#7f8e37">connect</a>( quit, SIGNAL(clicked()), qApp, SLOT(quit()) );

    <a name="QGridLayout"></a><a href="qgridlayout.html">QGridLayout</a> * l = new <a href="qgridlayout.html">QGridLayout</a>( this, 2, 2, 5 );
    l-&gt;<a name="addWidget"></a><a href="qgridlayout.html#dac29c">addWidget</a>( left, 0, 0 );
    l-&gt;<a href="qgridlayout.html#dac29c">addWidget</a>( right, 0, 1 );
    l-&gt;<a href="qgridlayout.html#dac29c">addWidget</a>( quit, 1, 1, AlignRight );

    left-&gt;setFocus();
}

void <a name="335"></a>Rot13::changeLeft()
{
    left-&gt;blockSignals( TRUE );
    left-&gt;setText( <a name="rot13"></a><a href="#337">rot13</a>( right-&gt;text() ) );
    left-&gt;blockSignals( FALSE );
}

void <a name="336"></a>Rot13::changeRight()
{
    right-&gt;blockSignals( TRUE );
    right-&gt;setText( <a href=#337>rot13</a>( left-&gt;text() ) );
    right-&gt;blockSignals( FALSE );
}

<a name="QString"></a><a href="qstring.html">QString</a> <a name="337"></a>Rot13::rot13( const QString &amp; input ) const
{
    <a href="qstring.html">QString</a> r = input;
    int i = r.length();
    while( i-- ) {
        if ( r[i] &gt;= QChar('A') &amp;&amp; r[i] &lt;= QChar('M') ||
             r[i] &gt;= QChar('a') &amp;&amp; r[i] &lt;= QChar('m') )
            r[i] = (char)((int)QChar(r[i]) + 13);
        else if  ( r[i] &gt;= QChar('N') &amp;&amp; r[i] &lt;= QChar('Z') ||
                   r[i] &gt;= QChar('n') &amp;&amp; r[i] &lt;= QChar('z') )
            r[i] = (char)((int)QChar(r[i]) - 13);
    }
    return r;
}

int main( int argc, char ** argv )
{
    <a name="QApplication"></a><a href="qapplication.html">QApplication</a> a( argc, argv );
    Rot13 r;
    r.<a name="resize"></a><a href="qwidget.html#8fcbbe">resize</a>( 400, 400 );
    a.<a name="setMainWidget"></a><a href="qapplication.html#7ad759">setMainWidget</a>( &amp;r );
    r.<a name="setCaption"></a><a href="qwidget.html#d6a291">setCaption</a>("Qt Example - ROT13");
    r.<a name="show"></a><a href="qwidget.html#200ee5">show</a>();
    return a.<a name="exec"></a><a href="qapplication.html#84c7bf">exec</a>();
}
</pre>
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<td>Copyright  2001 Trolltech<td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align="right"><div align="right">Qt version 2.3.2</div>
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