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

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2<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/listboxcombo/listboxcombo.doc:4 -->
3<html>
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5<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
6<title>Listboxes and Comboboxes</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>
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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>Listboxes and Comboboxes</h1>
33
34
35<p>
36This example program demonstrates how to use listboxes (with single selection
37and multi selection) and comboboxes (editable and non-editable).
38<p> <hr>
39<p> Header file:
40<p> <pre>/****************************************************************************
41** $Id: listboxcombo-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_COMBO_H
51#define LISTBOX_COMBO_H
52
53#include &lt;<a href="qvbox-h.html">qvbox.h</a>&gt;
54
55class QListBox;
56class QLabel;
57
58class ListBoxCombo : public <a href="qvbox.html">QVBox</a>
59{
60 <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
61
62public:
63 ListBoxCombo( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0 );
64
65protected:
66 <a href="qlistbox.html">QListBox</a> *lb1, *lb2;
67 <a href="qlabel.html">QLabel</a> *label1, *label2;
68
69protected slots:
70 void slotLeft2Right();
71 void slotCombo1Activated( const <a href="qstring.html">QString</a> &amp;s );
72 void slotCombo2Activated( const <a href="qstring.html">QString</a> &amp;s );
73
74};
75
76#endif
77</pre>
78
79<p> <hr>
80<p> Implementation:
81<p> <pre>/****************************************************************************
82** $Id: listboxcombo-example.html 2051 2007-02-21 10:04:20Z chehrlic $
83**
84** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
85**
86** This file is part of an example program for Qt. This example
87** program may be used, distributed and modified without limitation.
88**
89*****************************************************************************/
90
91#include "listboxcombo.h"
92
93#include &lt;<a href="qcombobox-h.html">qcombobox.h</a>&gt;
94#include &lt;<a href="qlistbox-h.html">qlistbox.h</a>&gt;
95#include &lt;<a href="qhbox-h.html">qhbox.h</a>&gt;
96#include &lt;<a href="qpushbutton-h.html">qpushbutton.h</a>&gt;
97#include &lt;<a href="qstring-h.html">qstring.h</a>&gt;
98#include &lt;<a href="qpixmap-h.html">qpixmap.h</a>&gt;
99#include &lt;<a href="qlabel-h.html">qlabel.h</a>&gt;
100#include &lt;<a href="qimage-h.html">qimage.h</a>&gt;
101#include &lt;<a href="qpainter-h.html">qpainter.h</a>&gt;
102#include &lt;<a href="qstyle-h.html">qstyle.h</a>&gt;
103
104
105class MyListBoxItem : public <a href="qlistboxitem.html">QListBoxItem</a>
106{
107public:
108 MyListBoxItem()
109 : <a href="qlistboxitem.html">QListBoxItem</a>()
110 {
111 setCustomHighlighting( TRUE );
112 }
113
114protected:
115 virtual void paint( <a href="qpainter.html">QPainter</a> * );
116 virtual int width( const <a href="qlistbox.html">QListBox</a>* ) const { return 100; }
117 virtual int height( const <a href="qlistbox.html">QListBox</a>* ) const { return 16; }
118
119};
120
121<a name="x1410"></a>void MyListBoxItem::<a href="qlistboxitem.html#paint">paint</a>( <a href="qpainter.html">QPainter</a> *painter )
122{
123 // evil trick: find out whether we are painted onto our listbox
124<a name="x1413"></a> bool in_list_box = <a href="qlistboxitem.html#listBox">listBox</a>() &amp;&amp; listBox()-&gt;viewport() == painter-&gt;<a href="qpainter.html#device">device</a>();
125
126 <a href="qrect.html">QRect</a> r ( 0, 0, width( <a href="qlistboxitem.html#listBox">listBox</a>() ), height( <a href="qlistboxitem.html#listBox">listBox</a>() ) );
127 if ( in_list_box &amp;&amp; isSelected() )
128<a name="x1414"></a> painter-&gt;<a href="qpainter.html#eraseRect">eraseRect</a>( r );
129<a name="x1415"></a> painter-&gt;<a href="qpainter.html#fillRect">fillRect</a>( 5, 5, width( listBox() ) - 10, height( listBox() ) - 10, Qt::red );
130 if ( in_list_box &amp;&amp; isCurrent() )
131 listBox()-&gt;style().drawPrimitive( QStyle::PE_FocusRect, painter, r, listBox()-&gt;colorGroup() );
132}
133
134/*
135 * Constructor
136 *
137 * Creates child widgets of the ListBoxCombo widget
138 */
139
140<a name="f437"></a>ListBoxCombo::ListBoxCombo( <a href="qwidget.html">QWidget</a> *parent, const char *name )
141 : <a href="qvbox.html">QVBox</a>( parent, name )
142{
143 <a href="qframe.html#setMargin">setMargin</a>( 5 );
144 <a href="qhbox.html#setSpacing">setSpacing</a>( 5 );
145
146 unsigned int i;
147 <a href="qstring.html">QString</a> str;
148
149 <a href="qhbox.html">QHBox</a> *row1 = new <a href="qhbox.html">QHBox</a>( this );
150<a name="x1402"></a> row1-&gt;<a href="qhbox.html#setSpacing">setSpacing</a>( 5 );
151
152 // Create a multi-selection ListBox...
153 lb1 = new <a href="qlistbox.html">QListBox</a>( row1 );
154<a name="x1408"></a> lb1-&gt;<a href="qlistbox.html#setSelectionMode">setSelectionMode</a>( QListBox::Multi );
155
156 // ...insert a pixmap item...
157<a name="x1406"></a> lb1-&gt;<a href="qlistbox.html#insertItem">insertItem</a>( QPixmap( "qtlogo.png" ) );
158 // ...and 100 text items
159 for ( i = 0; i &lt; 100; i++ ) {
160 str = QString( "Listbox Item %1" ).arg( i );
161 if ( !( i % 4 ) )
162 lb1-&gt;<a href="qlistbox.html#insertItem">insertItem</a>( QPixmap( "fileopen.xpm" ), str );
163 else
164 lb1-&gt;<a href="qlistbox.html#insertItem">insertItem</a>( str );
165 }
166
167 // Create a pushbutton...
168 <a href="qpushbutton.html">QPushButton</a> *arrow1 = new <a href="qpushbutton.html">QPushButton</a>( " -&gt; ", row1 );
169 // ...and connect the clicked SIGNAL with the SLOT slotLeft2Right
170 <a href="qobject.html#connect">connect</a>( arrow1, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( slotLeft2Right() ) );
171
172 // create an empty single-selection ListBox
173 lb2 = new <a href="qlistbox.html">QListBox</a>( row1 );
174
175 <a href="qhbox.html">QHBox</a> *row2 = new <a href="qhbox.html">QHBox</a>( this );
176 row2-&gt;<a href="qhbox.html#setSpacing">setSpacing</a>( 5 );
177
178 <a href="qvbox.html">QVBox</a> *box1 = new <a href="qvbox.html">QVBox</a>( row2 );
179 box1-&gt;<a href="qhbox.html#setSpacing">setSpacing</a>( 5 );
180
181 // Create a non-editable Combobox and a label below...
182 <a href="qcombobox.html">QComboBox</a> *cb1 = new <a href="qcombobox.html">QComboBox</a>( FALSE, box1 );
183 label1 = new <a href="qlabel.html">QLabel</a>( "Current Item: Combobox Item 0", box1 );
184<a name="x1416"></a><a name="x1404"></a> label1-&gt;<a href="qwidget.html#setMaximumHeight">setMaximumHeight</a>( label1-&gt;<a href="qwidget.html#sizeHint">sizeHint</a>().height() * 2 );
185<a name="x1401"></a> label1-&gt;<a href="qframe.html#setFrameStyle">setFrameStyle</a>( QFrame::Panel | QFrame::Sunken );
186
187 //...and insert 50 items into the Combobox
188 for ( i = 0; i &lt; 50; i++ ) {
189 str = QString( "Combobox Item %1" ).arg( i );
190 if ( i % 9 )
191<a name="x1399"></a> cb1-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( str );
192 else
193<a name="x1400"></a> cb1-&gt;<a href="qcombobox.html#listBox">listBox</a>()-&gt;insertItem( new MyListBoxItem );
194 }
195
196 <a href="qvbox.html">QVBox</a> *box2 = new <a href="qvbox.html">QVBox</a>( row2 );
197 box2-&gt;<a href="qhbox.html#setSpacing">setSpacing</a>( 5 );
198
199 // Create an editable Combobox and a label below...
200 <a href="qcombobox.html">QComboBox</a> *cb2 = new <a href="qcombobox.html">QComboBox</a>( TRUE, box2 );
201 label2 = new <a href="qlabel.html">QLabel</a>( "Current Item: Combobox Item 0", box2 );
202 label2-&gt;<a href="qwidget.html#setMaximumHeight">setMaximumHeight</a>( label2-&gt;<a href="qwidget.html#sizeHint">sizeHint</a>().height() * 2 );
203 label2-&gt;<a href="qframe.html#setFrameStyle">setFrameStyle</a>( QFrame::Panel | QFrame::Sunken );
204
205 // ... and insert 50 items into the Combobox
206 for ( i = 0; i &lt; 50; i++ ) {
207 str = QString( "Combobox Item %1" ).arg( i );
208 if ( !( i % 4 ) )
209 cb2-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( QPixmap( "fileopen.xpm" ), str );
210 else
211 cb2-&gt;<a href="qcombobox.html#insertItem">insertItem</a>( str );
212 }
213
214 // Connect the activated SIGNALs of the Comboboxes with SLOTs
215<a name="x1398"></a> <a href="qobject.html#connect">connect</a>( cb1, SIGNAL( <a href="qcombobox.html#activated">activated</a>( const <a href="qstring.html">QString</a> &amp; ) ), this, SLOT( slotCombo1Activated( const <a href="qstring.html">QString</a> &amp; ) ) );
216 <a href="qobject.html#connect">connect</a>( cb2, SIGNAL( <a href="qcombobox.html#activated">activated</a>( const <a href="qstring.html">QString</a> &amp; ) ), this, SLOT( slotCombo2Activated( const <a href="qstring.html">QString</a> &amp; ) ) );
217}
218
219/*
220 * SLOT slotLeft2Right
221 *
222 * Copies all selected items of the first ListBox into the
223 * second ListBox
224 */
225
226void <a name="f438"></a>ListBoxCombo::slotLeft2Right()
227{
228 // Go through all items of the first ListBox
229<a name="x1405"></a> for ( unsigned int i = 0; i &lt; lb1-&gt;<a href="qlistbox.html#count">count</a>(); i++ ) {
230<a name="x1407"></a> <a href="qlistboxitem.html">QListBoxItem</a> *item = lb1-&gt;<a href="qlistbox.html#item">item</a>( i );
231 // if the item is selected...
232<a name="x1409"></a> if ( item-&gt;<a href="qlistboxitem.html#isSelected">isSelected</a>() ) {
233 // ...and it is a text item...
234<a name="x1412"></a><a name="x1411"></a> if ( item-&gt;<a href="qlistboxitem.html#pixmap">pixmap</a>() &amp;&amp; !item-&gt;<a href="qlistboxitem.html#text">text</a>().isEmpty() )
235 lb2-&gt;<a href="qlistbox.html#insertItem">insertItem</a>( *item-&gt;<a href="qlistboxitem.html#pixmap">pixmap</a>(), item-&gt;<a href="qlistboxitem.html#text">text</a>() );
236 else if ( !item-&gt;<a href="qlistboxitem.html#pixmap">pixmap</a>() )
237 lb2-&gt;<a href="qlistbox.html#insertItem">insertItem</a>( item-&gt;<a href="qlistboxitem.html#text">text</a>() );
238 else if ( item-&gt;<a href="qlistboxitem.html#text">text</a>().isEmpty() )
239 lb2-&gt;<a href="qlistbox.html#insertItem">insertItem</a>( *item-&gt;<a href="qlistboxitem.html#pixmap">pixmap</a>() );
240 }
241 }
242}
243
244/*
245 * SLOT slotCombo1Activated( const <a href="qstring.html">QString</a> &amp;s )
246 *
247 * Sets the text of the item which the user just selected
248 * in the first Combobox (and is now the value of s) to
249 * the first Label.
250 */
251
252void <a name="f439"></a>ListBoxCombo::slotCombo1Activated( const <a href="qstring.html">QString</a> &amp;s )
253{
254<a name="x1403"></a> label1-&gt;<a href="qlabel.html#setText">setText</a>( QString( "Current Item: %1" ).arg( s ) );
255}
256
257/*
258 * SLOT slotCombo2Activated( const <a href="qstring.html">QString</a> &amp;s )
259 *
260 * Sets the text of the item which the user just selected
261 * in the second Combobox (and is now the value of s) to
262 * the second Label.
263 */
264
265void <a name="f440"></a>ListBoxCombo::slotCombo2Activated( const <a href="qstring.html">QString</a> &amp;s )
266{
267 label2-&gt;<a href="qlabel.html#setText">setText</a>( QString( "Current Item: %1" ).arg( s ) );
268}
269</pre>
270
271<p> <hr>
272<p> Main:
273<p> <pre>/****************************************************************************
274** $Id: listboxcombo-example.html 2051 2007-02-21 10:04:20Z chehrlic $
275**
276** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
277**
278** This file is part of an example program for Qt. This example
279** program may be used, distributed and modified without limitation.
280**
281*****************************************************************************/
282
283#include "listboxcombo.h"
284#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
285
286int main( int argc, char **argv )
287{
288 <a href="qapplication.html">QApplication</a> a( argc, argv );
289
290 ListBoxCombo listboxcombo;
291 listboxcombo.<a href="qwidget.html#resize">resize</a>( 400, 270 );
292 listboxcombo.<a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - Listboxes and Comboboxes" );
293 a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &amp;listboxcombo );
294 listboxcombo.<a href="qwidget.html#show">show</a>();
295
296 return a.<a href="qapplication.html#exec">exec</a>();
297}
298</pre>
299
300<p>See also <a href="examples.html">Examples</a>.
301
302<!-- eof -->
303<p><address><hr><div align=center>
304<table width=100% cellspacing=0 border=0><tr>
305<td>Copyright &copy; 2007
306<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
307<td align=right><div align=right>Qt 3.3.8</div>
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