source: trunk/doc/html/rot-example.html

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[190]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
2<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/rot13/rot13.doc:4 -->
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5<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
6<title>Rot13</title>
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31</td>
32<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Rot13</h1>
33
34
35<p>
36This example lets you enter a text into a mulitilineedit widget.
37It will be displayed in the edit widget to the right transformed using
38the rot13 algorithm.
39<p> <hr>
40<p> Header file:
41<p> <pre>/****************************************************************************
42** $Id: rot-example.html 2051 2007-02-21 10:04:20Z chehrlic $
43**
44** Definition of something or other
45**
46** Created : 979899
47**
48** Copyright (C) 1997-2007 Trolltech ASA. All rights reserved.
49**
50** This file is part of an example program for Qt. This example
51** program may be used, distributed and modified without limitation.
52**
53*****************************************************************************/
54
55#ifndef ROT13_H
56#define ROT13_H
57
58#include &lt;<a href="qwidget-h.html">qwidget.h</a>&gt;
59
60class QMultiLineEdit;
61
62class Rot13: public <a href="qwidget.html">QWidget</a> {
63 <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
64public:
65 Rot13();
66
67 <a href="qstring.html">QString</a> rot13( const <a href="qstring.html">QString</a> &amp; ) const;
68
69private slots:
70 void changeLeft();
71 void changeRight();
72
73private:
74 <a href="qmultilineedit.html">QMultiLineEdit</a> * left, * right;
75};
76
77#endif
78</pre>
79
80<p> <hr>
81<p> Implementation:
82<p> <pre>/****************************************************************************
83** $Id: rot-example.html 2051 2007-02-21 10:04:20Z chehrlic $
84**
85** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
86**
87** This file is part of an example program for Qt. This example
88** program may be used, distributed and modified without limitation.
89**
90*****************************************************************************/
91
92#include "rot13.h"
93
94#include &lt;<a href="qmultilineedit-h.html">qmultilineedit.h</a>&gt;
95#include &lt;<a href="qpushbutton-h.html">qpushbutton.h</a>&gt;
96#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
97#include &lt;<a href="qlayout-h.html">qlayout.h</a>&gt;
98
99<a name="f432"></a>Rot13::Rot13()
100{
101 left = new <a href="qmultilineedit.html">QMultiLineEdit</a>( this, "left" );
102 right = new <a href="qmultilineedit.html">QMultiLineEdit</a>( this, "right" );
103<a name="x1375"></a> <a href="qobject.html#connect">connect</a>( left, SIGNAL(<a href="qtextedit.html#textChanged">textChanged</a>()), this, SLOT(changeRight()) );
104 <a href="qobject.html#connect">connect</a>( right, SIGNAL(<a href="qtextedit.html#textChanged">textChanged</a>()), this, SLOT(changeLeft()) );
105
106 <a href="qpushbutton.html">QPushButton</a> * quit = new <a href="qpushbutton.html">QPushButton</a>( "&amp;Quit", this );
107<a name="x1379"></a> quit-&gt;<a href="qwidget.html#setFocusPolicy">setFocusPolicy</a>( NoFocus );
108 <a href="qobject.html#connect">connect</a>( quit, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), qApp, SLOT(<a href="qapplication.html#quit">quit</a>()) );
109
110 <a href="qgridlayout.html">QGridLayout</a> * l = new <a href="qgridlayout.html">QGridLayout</a>( this, 2, 2, 5 );
111<a name="x1370"></a> l-&gt;<a href="qgridlayout.html#addWidget">addWidget</a>( left, 0, 0 );
112 l-&gt;<a href="qgridlayout.html#addWidget">addWidget</a>( right, 0, 1 );
113 l-&gt;<a href="qgridlayout.html#addWidget">addWidget</a>( quit, 1, 1, AlignRight );
114
115<a name="x1378"></a> left-&gt;<a href="qwidget.html#setFocus">setFocus</a>();
116}
117
118
119void <a name="f433"></a>Rot13::changeLeft()
120{
121<a name="x1371"></a> left-&gt;<a href="qobject.html#blockSignals">blockSignals</a>( TRUE );
122<a name="x1374"></a><a name="x1373"></a> left-&gt;<a href="qtextedit.html#setText">setText</a>( rot13( right-&gt;<a href="qtextedit.html#text">text</a>() ) );
123 left-&gt;<a href="qobject.html#blockSignals">blockSignals</a>( FALSE );
124}
125
126
127void <a name="f434"></a>Rot13::changeRight()
128{
129 right-&gt;<a href="qobject.html#blockSignals">blockSignals</a>( TRUE );
130 right-&gt;<a href="qtextedit.html#setText">setText</a>( rot13( left-&gt;<a href="qtextedit.html#text">text</a>() ) );
131 right-&gt;<a href="qobject.html#blockSignals">blockSignals</a>( FALSE );
132}
133
134
135QString <a name="f435"></a>Rot13::rot13( const <a href="qstring.html">QString</a> &amp; input ) const
136{
137 <a href="qstring.html">QString</a> r = input;
138<a name="x1372"></a> int i = r.<a href="qstring.html#length">length</a>();
139 while( i-- ) {
140 if ( r[i] &gt;= QChar('A') &amp;&amp; r[i] &lt;= QChar('M') ||
141 r[i] &gt;= QChar('a') &amp;&amp; r[i] &lt;= QChar('m') )
142 r[i] = (char)((int)QChar(r[i]) + 13);
143 else if ( r[i] &gt;= QChar('N') &amp;&amp; r[i] &lt;= QChar('Z') ||
144 r[i] &gt;= QChar('n') &amp;&amp; r[i] &lt;= QChar('z') )
145 r[i] = (char)((int)QChar(r[i]) - 13);
146 }
147 return r;
148}
149
150
151int main( int argc, char ** argv )
152{
153 <a href="qapplication.html">QApplication</a> a( argc, argv );
154 Rot13 r;
155 r.<a href="qwidget.html#resize">resize</a>( 400, 400 );
156 a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &amp;r );
157 r.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - ROT13");
158 r.<a href="qwidget.html#show">show</a>();
159 return a.<a href="qapplication.html#exec">exec</a>();
160}
161</pre>
162
163<p>See also <a href="examples.html">Examples</a>.
164
165<!-- eof -->
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169<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
170<td align=right><div align=right>Qt 3.3.8</div>
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