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

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2<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/lineedits/lineedits.doc:4 -->
3<html>
4<head>
5<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
6<title>Line Edits</title>
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17<tr bgcolor="#E5E5E5">
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19 <a href="index.html">
20<font color="#004faf">Home</font></a>
21 | <a href="classes.html">
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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>Line Edits</h1>
33
34
35<p>
36This example shows how to work with single lineedit widgets, and
37how to use different echo modes and validators.
38<p> <hr>
39<p> Header file:
40<p> <pre>/****************************************************************************
41** $Id: lineedits-example.html 2051 2007-02-21 10:04:20Z chehrlic $
42**
43** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
44**
45** This file is part of an example program for Qt. This example
46** program may be used, distributed and modified without limitation.
47**
48*****************************************************************************/
49
50#ifndef LINEDITS_H
51#define LINEDITS_H
52
53#include &lt;<a href="qgroupbox-h.html">qgroupbox.h</a>&gt;
54
55class QLineEdit;
56class QComboBox;
57
58class LineEdits : public <a href="qgroupbox.html">QGroupBox</a>
59{
60 <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
61
62public:
63 LineEdits( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0 );
64
65protected:
66 <a href="qlineedit.html">QLineEdit</a> *lined1, *lined2, *lined3, *lined4, *lined5;
67 <a href="qcombobox.html">QComboBox</a> *combo1, *combo2, *combo3, *combo4, *combo5;
68
69protected slots:
70 void slotEchoChanged( int );
71 void slotValidatorChanged( int );
72 void slotAlignmentChanged( int );
73 void slotInputMaskChanged( int );
74 void slotReadOnlyChanged( int );
75};
76
77#endif
78</pre>
79
80<p> <hr>
81<p> Implementation:
82<p> <pre>/****************************************************************************
83** $Id: lineedits-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 "lineedits.h"
93
94#include &lt;<a href="qlineedit-h.html">qlineedit.h</a>&gt;
95#include &lt;<a href="qcombobox-h.html">qcombobox.h</a>&gt;
96#include &lt;<a href="qframe-h.html">qframe.h</a>&gt;
97#include &lt;<a href="qvalidator-h.html">qvalidator.h</a>&gt;
98#include &lt;<a href="qlabel-h.html">qlabel.h</a>&gt;
99#include &lt;<a href="qlayout-h.html">qlayout.h</a>&gt;
100#include &lt;<a href="qhbox-h.html">qhbox.h</a>&gt;
101
102/*
103 * Constructor
104 *
105 * Creates child widgets of the LineEdits widget
106 */
107
108<a name="f219"></a>LineEdits::LineEdits( <a href="qwidget.html">QWidget</a> *parent, const char *name )
109 : <a href="qgroupbox.html">QGroupBox</a>( 0, Horizontal, "Line edits", parent, name )
110{
111 <a href="qframe.html#setMargin">setMargin</a>( 10 );
112
113 <a href="qvboxlayout.html">QVBoxLayout</a>* box = new <a href="qvboxlayout.html">QVBoxLayout</a>( <a href="qwidget.html#layout">layout</a>() );
114
115 <a href="qhboxlayout.html">QHBoxLayout</a> *row1 = new <a href="qhboxlayout.html">QHBoxLayout</a>( box );
116<a name="x173"></a> row1-&gt;<a href="qlayout.html#setMargin">setMargin</a>( 5 );
117
118 // Create a Label
119 <a href="qlabel.html">QLabel</a>* label = new <a href="qlabel.html">QLabel</a>( "Echo Mode: ", this);
120<a name="x169"></a> row1-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( label );
121
122 // Create a Combobox with three items...
123 combo1 = new <a href="qcombobox.html">QComboBox</a>( FALSE, this );
124 row1-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( combo1 );
125<a name="x171"></a> combo1-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( "Normal" );
126 combo1-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( "Password" );
127 combo1-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( "No Echo" );
128 // ...and connect the activated() SIGNAL with the slotEchoChanged() SLOT to be able
129 // to react when an item is selected
130<a name="x170"></a> <a href="qobject.html#connect">connect</a>( combo1, SIGNAL( <a href="qcombobox.html#activated">activated</a>( int ) ), this, SLOT( slotEchoChanged( int ) ) );
131
132 // insert the first LineEdit
133 lined1 = new <a href="qlineedit.html">QLineEdit</a>( this );
134 box-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( lined1 );
135
136 // another widget which is used for layouting
137 <a href="qhboxlayout.html">QHBoxLayout</a> *row2 = new <a href="qhboxlayout.html">QHBoxLayout</a>( box );
138 row2-&gt;<a href="qlayout.html#setMargin">setMargin</a>( 5 );
139
140 // and the second label
141 label = new <a href="qlabel.html">QLabel</a>( "Validator: ", this );
142 row2-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( label );
143
144 // A second Combobox with again three items...
145 combo2 = new <a href="qcombobox.html">QComboBox</a>( FALSE, this );
146 row2-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( combo2 );
147 combo2-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( "No Validator" );
148 combo2-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( "Integer Validator" );
149 combo2-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( "Double Validator" );
150 // ...and again the activated() SIGNAL gets connected with a SLOT
151 <a href="qobject.html#connect">connect</a>( combo2, SIGNAL( <a href="qcombobox.html#activated">activated</a>( int ) ), this, SLOT( slotValidatorChanged( int ) ) );
152
153 // and the second LineEdit
154 lined2 = new <a href="qlineedit.html">QLineEdit</a>( this );
155 box-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( lined2 );
156
157 // yet another widget which is used for layouting
158 <a href="qhboxlayout.html">QHBoxLayout</a> *row3 = new <a href="qhboxlayout.html">QHBoxLayout</a>( box );
159 row3-&gt;<a href="qlayout.html#setMargin">setMargin</a>( 5 );
160
161 // we need a label for this too
162 label = new <a href="qlabel.html">QLabel</a>( "Alignment: ", this );
163 row3-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( label );
164
165 // A combo box for setting alignment
166 combo3 = new <a href="qcombobox.html">QComboBox</a>( FALSE, this );
167 row3-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( combo3 );
168 combo3-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( "Left" );
169 combo3-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( "Centered" );
170 combo3-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( "Right" );
171 // ...and again the activated() SIGNAL gets connected with a SLOT
172 <a href="qobject.html#connect">connect</a>( combo3, SIGNAL( <a href="qcombobox.html#activated">activated</a>( int ) ), this, SLOT( slotAlignmentChanged( int ) ) );
173
174 // and the third lineedit
175 lined3 = new <a href="qlineedit.html">QLineEdit</a>( this );
176 box-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( lined3 );
177
178 // exactly the same for the fourth
179 <a href="qhboxlayout.html">QHBoxLayout</a> *row4 = new <a href="qhboxlayout.html">QHBoxLayout</a>( box );
180 row4-&gt;<a href="qlayout.html#setMargin">setMargin</a>( 5 );
181
182 // we need a label for this too
183 label = new <a href="qlabel.html">QLabel</a>( "Input mask: ", this );
184 row4-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( label );
185
186 // A combo box for choosing an input mask
187 combo4 = new <a href="qcombobox.html">QComboBox</a>( FALSE, this );
188 row4-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( combo4 );
189 combo4-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( "No mask" );
190 combo4-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( "Phone number" );
191 combo4-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( "ISO date" );
192 combo4-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( "License key" );
193
194 // ...this time we use the activated( const <a href="qstring.html">QString</a> &amp; ) signal
195 <a href="qobject.html#connect">connect</a>( combo4, SIGNAL( <a href="qcombobox.html#activated">activated</a>( int ) ),
196 this, SLOT( slotInputMaskChanged( int ) ) );
197
198 // and the fourth lineedit
199 lined4 = new <a href="qlineedit.html">QLineEdit</a>( this );
200 box-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( lined4 );
201
202 // last widget used for layouting
203 <a href="qhbox.html">QHBox</a> *row5 = new <a href="qhbox.html">QHBox</a>( this );
204 box-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( row5 );
205 row5-&gt;<a href="qframe.html#setMargin">setMargin</a>( 5 );
206
207 // last label
208 (void)new <a href="qlabel.html">QLabel</a>( "Read-Only: ", row5 );
209
210 // A combo box for setting alignment
211 combo5 = new <a href="qcombobox.html">QComboBox</a>( FALSE, row5 );
212 combo5-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( "False" );
213 combo5-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( "True" );
214 // ...and again the activated() SIGNAL gets connected with a SLOT
215 <a href="qobject.html#connect">connect</a>( combo5, SIGNAL( <a href="qcombobox.html#activated">activated</a>( int ) ), this, SLOT( slotReadOnlyChanged( int ) ) );
216
217 // and the last lineedit
218 lined5 = new <a href="qlineedit.html">QLineEdit</a>( this );
219 box-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( lined5 );
220
221 // give the first LineEdit the focus at the beginning
222<a name="x181"></a> lined1-&gt;<a href="qwidget.html#setFocus">setFocus</a>();
223}
224
225/*
226 * SLOT slotEchoChanged( int i )
227 *
228 * i contains the number of the item which the user has been chosen in the
229 * first Combobox. According to this value, we set the Echo-Mode for the
230 * first LineEdit.
231 */
232
233void <a name="f220"></a>LineEdits::slotEchoChanged( int i )
234{
235 switch ( i ) {
236 case 0:
237<a name="x176"></a> lined1-&gt;<a href="qlineedit.html#setEchoMode">setEchoMode</a>( QLineEdit::Normal );
238 break;
239 case 1:
240 lined1-&gt;<a href="qlineedit.html#setEchoMode">setEchoMode</a>( QLineEdit::Password );
241 break;
242 case 2:
243 lined1-&gt;<a href="qlineedit.html#setEchoMode">setEchoMode</a>( QLineEdit::NoEcho );
244 break;
245 }
246
247 lined1-&gt;<a href="qwidget.html#setFocus">setFocus</a>();
248}
249
250/*
251 * SLOT slotValidatorChanged( int i )
252 *
253 * i contains the number of the item which the user has been chosen in the
254 * second Combobox. According to this value, we set a validator for the
255 * second LineEdit. A validator checks in a LineEdit each character which
256 * the user enters and accepts it if it is valid, else the character gets
257 * ignored and not inserted into the lineedit.
258 */
259
260void <a name="f221"></a>LineEdits::slotValidatorChanged( int i )
261{
262 switch ( i ) {
263 case 0:
264<a name="x180"></a> lined2-&gt;<a href="qlineedit.html#setValidator">setValidator</a>( 0 );
265 break;
266 case 1:
267 lined2-&gt;<a href="qlineedit.html#setValidator">setValidator</a>( new <a href="qintvalidator.html">QIntValidator</a>( lined2 ) );
268 break;
269 case 2:
270 lined2-&gt;<a href="qlineedit.html#setValidator">setValidator</a>( new <a href="qdoublevalidator.html">QDoubleValidator</a>( -999.0, 999.0, 2,
271 lined2 ) );
272 break;
273 }
274
275<a name="x179"></a> lined2-&gt;<a href="qlineedit.html#setText">setText</a>( "" );
276 lined2-&gt;<a href="qwidget.html#setFocus">setFocus</a>();
277}
278
279
280/*
281 * SLOT slotAlignmentChanged( int i )
282 *
283 * i contains the number of the item which the user has been chosen in
284 * the third Combobox. According to this value, we set an alignment
285 * third LineEdit.
286 */
287
288void <a name="f222"></a>LineEdits::slotAlignmentChanged( int i )
289{
290 switch ( i ) {
291 case 0:
292<a name="x174"></a> lined3-&gt;<a href="qlineedit.html#setAlignment">setAlignment</a>( QLineEdit::AlignLeft );
293 break;
294 case 1:
295 lined3-&gt;<a href="qlineedit.html#setAlignment">setAlignment</a>( QLineEdit::AlignCenter );
296 break;
297 case 2:
298 lined3-&gt;<a href="qlineedit.html#setAlignment">setAlignment</a>( QLineEdit::AlignRight );
299 break;
300 }
301
302 lined3-&gt;<a href="qwidget.html#setFocus">setFocus</a>();
303}
304
305/*
306 * SLOT slotInputMaskChanged( const <a href="qstring.html">QString</a> &amp;mask )
307 *
308 * i contains the number of the item which the user has been chosen in
309 * the third Combobox. According to this value, we set an input mask on
310 * third LineEdit.
311 */
312
313void <a name="f223"></a>LineEdits::slotInputMaskChanged( int i )
314{
315 switch( i ) {
316 case 0:
317<a name="x177"></a> lined4-&gt;<a href="qlineedit.html#setInputMask">setInputMask</a>( <a href="qstring.html#QString-null">QString::null</a> );
318 break;
319 case 1:
320 lined4-&gt;<a href="qlineedit.html#setInputMask">setInputMask</a>( "+99 99 99 99 99;_" );
321 break;
322 case 2:
323 lined4-&gt;<a href="qlineedit.html#setInputMask">setInputMask</a>( "0000-00-00" );
324 lined4-&gt;<a href="qlineedit.html#setText">setText</a>( "00000000" );
325<a name="x175"></a> lined4-&gt;<a href="qlineedit.html#setCursorPosition">setCursorPosition</a>( 0 );
326 break;
327 case 3:
328 lined4-&gt;<a href="qlineedit.html#setInputMask">setInputMask</a>( "&gt;AAAAA-AAAAA-AAAAA-AAAAA-AAAAA;#" );
329 break;
330 }
331 lined4-&gt;<a href="qwidget.html#setFocus">setFocus</a>();
332}
333
334/*
335 * SLOT slotReadOnlyChanged( int i )
336 *
337 * i contains the number of the item which the user has been chosen in
338 * the fourth Combobox. According to this value, we toggle read-only.
339 */
340
341void <a name="f224"></a>LineEdits::slotReadOnlyChanged( int i )
342{
343 switch ( i ) {
344 case 0:
345<a name="x178"></a> lined5-&gt;<a href="qlineedit.html#setReadOnly">setReadOnly</a>( FALSE );
346 break;
347 case 1:
348 lined5-&gt;<a href="qlineedit.html#setReadOnly">setReadOnly</a>( TRUE );
349 break;
350 }
351
352 lined5-&gt;<a href="qwidget.html#setFocus">setFocus</a>();
353}
354
355</pre>
356
357<p> <hr>
358<p> Main:
359<p> <pre>/****************************************************************************
360** $Id: lineedits-example.html 2051 2007-02-21 10:04:20Z chehrlic $
361**
362** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
363**
364** This file is part of an example program for Qt. This example
365** program may be used, distributed and modified without limitation.
366**
367*****************************************************************************/
368
369#include "lineedits.h"
370#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
371
372int main( int argc, char **argv )
373{
374 <a href="qapplication.html">QApplication</a> a( argc, argv );
375
376 LineEdits lineedits;
377 lineedits.<a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - Lineedits" );
378 a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &amp;lineedits );
379 lineedits.<a href="qwidget.html#show">show</a>();
380
381 return a.<a href="qapplication.html#exec">exec</a>();
382}
383</pre>
384
385<p>See also <a href="examples.html">Examples</a>.
386
387<!-- eof -->
388<p><address><hr><div align=center>
389<table width=100% cellspacing=0 border=0><tr>
390<td>Copyright &copy; 2007
391<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
392<td align=right><div align=right>Qt 3.3.8</div>
393</table></div></address></body>
394</html>
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