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

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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/listbox/listbox.doc:4 -->
3<html>
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5<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
6<title>Listbox Example</title>
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16<table border="0" cellpadding="0" cellspacing="0" width="100%">
17<tr bgcolor="#E5E5E5">
18<td valign=center>
19 <a href="index.html">
20<font color="#004faf">Home</font></a>
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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>Listbox Example</h1>
33
34
35<p>
36This example shows how to use the different modes (single columns, multiple columns,
37fixed number of rows, etc.) of <a href="qlistbox.html">QListBox</a>.
38<p> <hr>
39<p> Header file:
40<p> <pre>/****************************************************************************
41** $Id: listbox-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 LISTBOX_H
51#define LISTBOX_H
52
53
54class QSpinBox;
55class QListBox;
56class QButtonGroup;
57
58#include &lt;<a href="qwidget-h.html">qwidget.h</a>&gt;
59
60
61class ListBoxDemo: public <a href="qwidget.html">QWidget</a>
62{
63 <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
64public:
65 ListBoxDemo();
66 ~ListBoxDemo();
67
68private slots:
69 void setNumRows();
70 void setNumCols();
71 void setRowsByHeight();
72 void setColsByWidth();
73 void setVariableWidth( bool );
74 void setVariableHeight( bool );
75 void setMultiSelection( bool );
76 void sortAscending();
77 void sortDescending();
78
79private:
80 <a href="qlistbox.html">QListBox</a> * l;
81 <a href="qspinbox.html">QSpinBox</a> * columns;
82 <a href="qspinbox.html">QSpinBox</a> * rows;
83 <a href="qbuttongroup.html">QButtonGroup</a> * bg;
84};
85
86
87#endif
88</pre>
89
90<p> <hr>
91<p> Implementation:
92<p> <pre>/****************************************************************************
93** $Id: listbox-example.html 2051 2007-02-21 10:04:20Z chehrlic $
94**
95** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
96**
97** This file is part of an example program for Qt. This example
98** program may be used, distributed and modified without limitation.
99**
100*****************************************************************************/
101
102#include "listbox.h"
103
104#include &lt;<a href="qlabel-h.html">qlabel.h</a>&gt;
105#include &lt;<a href="qradiobutton-h.html">qradiobutton.h</a>&gt;
106#include &lt;<a href="qcheckbox-h.html">qcheckbox.h</a>&gt;
107#include &lt;<a href="qspinbox-h.html">qspinbox.h</a>&gt;
108#include &lt;<a href="qlistbox-h.html">qlistbox.h</a>&gt;
109#include &lt;<a href="qbuttongroup-h.html">qbuttongroup.h</a>&gt;
110#include &lt;<a href="qlayout-h.html">qlayout.h</a>&gt;
111#include &lt;<a href="qpushbutton-h.html">qpushbutton.h</a>&gt;
112
113
114<a name="f441"></a>ListBoxDemo::ListBoxDemo()
115 : <a href="qwidget.html">QWidget</a>( 0, 0 )
116{
117 <a href="qgridlayout.html">QGridLayout</a> * g = new <a href="qgridlayout.html">QGridLayout</a>( this, 2, 2, 6 );
118
119 g-&gt;<a href="qgridlayout.html#addWidget">addWidget</a>( new <a href="qlabel.html">QLabel</a>( "&lt;b&gt;Configuration:&lt;/b&gt;", this ), 0, 0 );
120 g-&gt;<a href="qgridlayout.html#addWidget">addWidget</a>( new <a href="qlabel.html">QLabel</a>( "&lt;b&gt;Result:&lt;/b&gt;", this ), 0, 1 );
121
122 l = new <a href="qlistbox.html">QListBox</a>( this );
123 g-&gt;<a href="qgridlayout.html#addWidget">addWidget</a>( l, 1, 1 );
124<a name="x1447"></a> l-&gt;<a href="qwidget.html#setFocusPolicy">setFocusPolicy</a>( QWidget::StrongFocus );
125
126 <a href="qvboxlayout.html">QVBoxLayout</a> * v = new <a href="qvboxlayout.html">QVBoxLayout</a>;
127<a name="x1430"></a> g-&gt;<a href="qgridlayout.html#addLayout">addLayout</a>( v, 1, 0 );
128
129 <a href="qradiobutton.html">QRadioButton</a> * b;
130 bg = new <a href="qbuttongroup.html">QButtonGroup</a>( 0 );
131
132 b = new <a href="qradiobutton.html">QRadioButton</a>( "Fixed number of columns,\n"
133 "as many rows as needed.",
134 this );
135<a name="x1428"></a> bg-&gt;<a href="qbuttongroup.html#insert">insert</a>( b );
136<a name="x1425"></a> v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( b );
137<a name="x1440"></a> b-&gt;<a href="qradiobutton.html#setChecked">setChecked</a>( TRUE );
138<a name="x1426"></a> <a href="qobject.html#connect">connect</a>( b, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), this, SLOT(setNumCols()) );
139 <a href="qhboxlayout.html">QHBoxLayout</a> * h = new <a href="qhboxlayout.html">QHBoxLayout</a>;
140<a name="x1422"></a> v-&gt;<a href="qboxlayout.html#addLayout">addLayout</a>( h );
141<a name="x1423"></a> h-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 30 );
142 h-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 100 );
143 h-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( new <a href="qlabel.html">QLabel</a>( "Columns:", this ) );
144 columns = new <a href="qspinbox.html">QSpinBox</a>( this );
145 h-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( columns );
146
147 v-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 12 );
148
149 b = new <a href="qradiobutton.html">QRadioButton</a>( "As many columns as fit on-screen,\n"
150 "as many rows as needed.",
151 this );
152 bg-&gt;<a href="qbuttongroup.html#insert">insert</a>( b );
153 v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( b );
154 <a href="qobject.html#connect">connect</a>( b, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), this, SLOT(setColsByWidth()) );
155
156 v-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 12 );
157
158 b = new <a href="qradiobutton.html">QRadioButton</a>( "Fixed number of rows,\n"
159 "as many columns as needed.",
160 this );
161 bg-&gt;<a href="qbuttongroup.html#insert">insert</a>( b );
162 v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( b );
163 <a href="qobject.html#connect">connect</a>( b, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), this, SLOT(setNumRows()) );
164 h = new <a href="qhboxlayout.html">QHBoxLayout</a>;
165 v-&gt;<a href="qboxlayout.html#addLayout">addLayout</a>( h );
166 h-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 30 );
167 h-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 100 );
168 h-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( new <a href="qlabel.html">QLabel</a>( "Rows:", this ) );
169 rows = new <a href="qspinbox.html">QSpinBox</a>( this );
170<a name="x1442"></a> rows-&gt;<a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
171 h-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( rows );
172
173 v-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 12 );
174
175 b = new <a href="qradiobutton.html">QRadioButton</a>( "As many rows as fit on-screen,\n"
176 "as many columns as needed.",
177 this );
178 bg-&gt;<a href="qbuttongroup.html#insert">insert</a>( b );
179 v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( b );
180 <a href="qobject.html#connect">connect</a>( b, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), this, SLOT(setRowsByHeight()) );
181
182 v-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 12 );
183
184 <a href="qcheckbox.html">QCheckBox</a> * cb = new <a href="qcheckbox.html">QCheckBox</a>( "Variable-height rows", this );
185<a name="x1429"></a> cb-&gt;<a href="qcheckbox.html#setChecked">setChecked</a>( TRUE );
186<a name="x1427"></a> <a href="qobject.html#connect">connect</a>( cb, SIGNAL(<a href="qbutton.html#toggled">toggled</a>(bool)), this, SLOT(setVariableHeight(bool)) );
187 v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( cb );
188 v-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 6 );
189
190 cb = new <a href="qcheckbox.html">QCheckBox</a>( "Variable-width columns", this );
191 <a href="qobject.html#connect">connect</a>( cb, SIGNAL(<a href="qbutton.html#toggled">toggled</a>(bool)), this, SLOT(setVariableWidth(bool)) );
192 v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( cb );
193
194 cb = new <a href="qcheckbox.html">QCheckBox</a>( "Extended-Selection", this );
195 <a href="qobject.html#connect">connect</a>( cb, SIGNAL(<a href="qbutton.html#toggled">toggled</a>(bool)), this, SLOT(setMultiSelection(bool)) );
196 v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( cb );
197
198 <a href="qpushbutton.html">QPushButton</a> *pb = new <a href="qpushbutton.html">QPushButton</a>( "Sort ascending", this );
199 <a href="qobject.html#connect">connect</a>( pb, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( sortAscending() ) );
200 v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( pb );
201
202 pb = new <a href="qpushbutton.html">QPushButton</a>( "Sort descending", this );
203 <a href="qobject.html#connect">connect</a>( pb, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( sortDescending() ) );
204 v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( pb );
205
206<a name="x1424"></a> v-&gt;<a href="qboxlayout.html#addStretch">addStretch</a>( 100 );
207
208 int i = 0;
209 while( ++i &lt;= 2560 )
210<a name="x1446"></a><a name="x1433"></a> l-&gt;<a href="qlistbox.html#insertItem">insertItem</a>( QString::<a href="qstring.html#fromLatin1">fromLatin1</a>( "Item " ) + QString::number( i ),
211 i );
212<a name="x1441"></a> columns-&gt;<a href="qrangecontrol.html#setRange">setRange</a>( 1, 256 );
213<a name="x1443"></a> columns-&gt;<a href="qspinbox.html#setValue">setValue</a>( 1 );
214 rows-&gt;<a href="qrangecontrol.html#setRange">setRange</a>( 1, 256 );
215 rows-&gt;<a href="qspinbox.html#setValue">setValue</a>( 256 );
216
217<a name="x1445"></a> <a href="qobject.html#connect">connect</a>( columns, SIGNAL(<a href="qspinbox.html#valueChanged">valueChanged</a>(int)), this, SLOT(setNumCols()) );
218 <a href="qobject.html#connect">connect</a>( rows, SIGNAL(<a href="qspinbox.html#valueChanged">valueChanged</a>(int)), this, SLOT(setNumRows()) );
219}
220
221
222ListBoxDemo::~ListBoxDemo()
223{
224 delete bg;
225}
226
227
228void <a name="f442"></a>ListBoxDemo::setNumRows()
229{
230 columns-&gt;<a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
231 rows-&gt;<a href="qwidget.html#setEnabled">setEnabled</a>( TRUE );
232<a name="x1444"></a><a name="x1435"></a> l-&gt;<a href="qlistbox.html#setRowMode">setRowMode</a>( rows-&gt;<a href="qspinbox.html#value">value</a>() );
233}
234
235
236void <a name="f443"></a>ListBoxDemo::setNumCols()
237{
238 columns-&gt;<a href="qwidget.html#setEnabled">setEnabled</a>( TRUE );
239 rows-&gt;<a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
240<a name="x1434"></a> l-&gt;<a href="qlistbox.html#setColumnMode">setColumnMode</a>( columns-&gt;<a href="qspinbox.html#value">value</a>() );
241}
242
243
244void <a name="f444"></a>ListBoxDemo::setRowsByHeight()
245{
246 columns-&gt;<a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
247 rows-&gt;<a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
248 l-&gt;<a href="qlistbox.html#setRowMode">setRowMode</a>( QListBox::FitToHeight );
249}
250
251
252void <a name="f445"></a>ListBoxDemo::setColsByWidth()
253{
254 columns-&gt;<a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
255 rows-&gt;<a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
256 l-&gt;<a href="qlistbox.html#setColumnMode">setColumnMode</a>( QListBox::FitToWidth );
257}
258
259
260void <a name="f446"></a>ListBoxDemo::setVariableWidth( bool b )
261{
262<a name="x1438"></a> l-&gt;<a href="qlistbox.html#setVariableWidth">setVariableWidth</a>( b );
263}
264
265
266void <a name="f447"></a>ListBoxDemo::setVariableHeight( bool b )
267{
268<a name="x1437"></a> l-&gt;<a href="qlistbox.html#setVariableHeight">setVariableHeight</a>( b );
269}
270
271void <a name="f448"></a>ListBoxDemo::setMultiSelection( bool b )
272{
273<a name="x1432"></a> l-&gt;<a href="qlistbox.html#clearSelection">clearSelection</a>();
274<a name="x1436"></a> l-&gt;<a href="qlistbox.html#setSelectionMode">setSelectionMode</a>( b ? QListBox::Extended : <a href="qlistbox.html">QListBox</a>::Single );
275}
276
277void <a name="f449"></a>ListBoxDemo::sortAscending()
278{
279<a name="x1439"></a> l-&gt;<a href="qlistbox.html#sort">sort</a>( TRUE );
280}
281
282void <a name="f450"></a>ListBoxDemo::sortDescending()
283{
284 l-&gt;<a href="qlistbox.html#sort">sort</a>( FALSE );
285}
286</pre>
287
288<p> <hr>
289<p> Main:
290<p> <pre>/****************************************************************************
291** $Id: listbox-example.html 2051 2007-02-21 10:04:20Z chehrlic $
292**
293** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
294**
295** This file is part of an example program for Qt. This example
296** program may be used, distributed and modified without limitation.
297**
298*****************************************************************************/
299
300#include "listbox.h"
301#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
302
303int main( int argc, char **argv )
304{
305 <a href="qapplication.html">QApplication</a> a( argc, argv );
306
307 ListBoxDemo t;
308 t.<a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - Listbox" );
309 a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &amp;t );
310 t.<a href="qwidget.html#show">show</a>();
311
312 return a.<a href="qapplication.html#exec">exec</a>();
313}
314</pre>
315
316<p>See also <a href="examples.html">Examples</a>.
317
318<!-- eof -->
319<p><address><hr><div align=center>
320<table width=100% cellspacing=0 border=0><tr>
321<td>Copyright &copy; 2007
322<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
323<td align=right><div align=right>Qt 3.3.8</div>
324</table></div></address></body>
325</html>
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