source: trunk/doc/html/statistics-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/table/statistics/statistics.doc:1 -->
3<html>
4<head>
5<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
6<title>Table Example</title>
7<style type="text/css"><!--
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14<body>
15
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>
21 | <a href="classes.html">
22<font color="#004faf">All&nbsp;Classes</font></a>
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24<font color="#004faf">Main&nbsp;Classes</font></a>
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26<font color="#004faf">Annotated</font></a>
27 | <a href="groups.html">
28<font color="#004faf">Grouped&nbsp;Classes</font></a>
29 | <a href="functions.html">
30<font color="#004faf">Functions</font></a>
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>Table Example</h1>
33
34
35<p>
36Another <a href="qtable.html">QTable</a> example.
37<p> <hr>
38<p> Header file:
39<p> <pre>/****************************************************************************
40** $Id: statistics-example.html 2051 2007-02-21 10:04:20Z chehrlic $
41**
42** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
43**
44** This file is part of an example program for Qt. This example
45** program may be used, distributed and modified without limitation.
46**
47*****************************************************************************/
48
49#ifndef STATISTICS_H
50#define STATISTICS_H
51
52#include &lt;<a href="qtable-h.html">qtable.h</a>&gt;
53#include &lt;<a href="qcombobox-h.html">qcombobox.h</a>&gt;
54
55class TableItem : public <a href="qtableitem.html">QTableItem</a>
56{
57public:
58 TableItem( <a href="qtable.html">QTable</a> *t, EditType et, const <a href="qstring.html">QString</a> &amp;txt ) : <a href="qtableitem.html">QTableItem</a>( t, et, txt ) {}
59 void paint( <a href="qpainter.html">QPainter</a> *p, const <a href="qcolorgroup.html">QColorGroup</a> &amp;cg, const <a href="qrect.html">QRect</a> &amp;cr, bool selected );
60};
61
62class ComboItem : public <a href="qtableitem.html">QTableItem</a>
63{
64public:
65 ComboItem( <a href="qtable.html">QTable</a> *t, EditType et );
66 <a href="qwidget.html">QWidget</a> *createEditor() const;
67 void setContentFromEditor( <a href="qwidget.html">QWidget</a> *w );
68 void setText( const <a href="qstring.html">QString</a> &amp;s );
69
70private:
71 <a href="qcombobox.html">QComboBox</a> *cb;
72
73};
74
75class Table : public <a href="qtable.html">QTable</a>
76{
77 <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
78
79public:
80 Table();
81 void sortColumn( int col, bool ascending, bool wholeRows );
82
83private slots:
84 void recalcSum( int row, int col );
85
86private:
87 void initTable();
88
89};
90
91#endif
92</pre>
93
94<p> <hr>
95<p> Implementation:
96<p> <pre>/****************************************************************************
97** $Id: statistics-example.html 2051 2007-02-21 10:04:20Z chehrlic $
98**
99** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
100**
101** This file is part of an example program for Qt. This example
102** program may be used, distributed and modified without limitation.
103**
104*****************************************************************************/
105
106#include "statistics.h"
107
108#include &lt;<a href="qdir-h.html">qdir.h</a>&gt;
109#include &lt;<a href="qstringlist-h.html">qstringlist.h</a>&gt;
110#include &lt;<a href="qheader-h.html">qheader.h</a>&gt;
111#include &lt;<a href="qcombobox-h.html">qcombobox.h</a>&gt;
112#include &lt;stdlib.h&gt;
113
114const char* dirs[] = {
115 "kernel",
116 "tools",
117 "widgets",
118 "dialogs",
119 "xml",
120 "table",
121 "network",
122 "opengl",
123 "canvas",
124 0
125};
126
127<a name="f578"></a>Table::Table()
128 : <a href="qtable.html">QTable</a>( 10, 100, 0, "table" )
129{
130 <a href="qtable.html#setSorting">setSorting</a>( TRUE );
131 <a href="qtable.html#horizontalHeader">horizontalHeader</a>()-&gt;setLabel( 0, tr( "File" ) );
132 <a href="qtable.html#horizontalHeader">horizontalHeader</a>()-&gt;setLabel( 1, tr( "Size (bytes)" ) );
133 <a href="qtable.html#horizontalHeader">horizontalHeader</a>()-&gt;setLabel( 2, tr( "Use in Sum" ) );
134 initTable();
135 <a href="qtable.html#adjustColumn">adjustColumn</a>( 0 );
136
137 // if the user edited something we might need to recalculate the sum
138 <a href="qobject.html#connect">connect</a>( this, SIGNAL( <a href="qtable.html#valueChanged">valueChanged</a>( int, int ) ),
139 this, SLOT( recalcSum( int, int ) ) );
140}
141
142void <a name="f579"></a>Table::initTable()
143{
144 // read all the Qt source and header files into a list
145 <a href="qstringlist.html">QStringList</a> all;
146 int i = 0;
147 <a href="qstring.html">QString</a> srcdir( "../../../src/" );
148 while ( dirs[ i ] ) {
149 <a href="qdir.html">QDir</a> dir( srcdir + dirs[ i ] );
150<a name="x2780"></a> <a href="qstringlist.html">QStringList</a> lst = dir.<a href="qdir.html#entryList">entryList</a>( "*.cpp; *.h" );
151<a name="x2791"></a><a name="x2789"></a> for ( QStringList::Iterator it = lst.<a href="qvaluelist.html#begin">begin</a>(); it != lst.<a href="qvaluelist.html#end">end</a>(); ++it ) {
152 if ( ( *it ).contains( "moc" ) )
153 continue;
154 all &lt;&lt; (QString( dirs[ i ] ) + "/" + *it);
155 }
156 ++i;
157 }
158
159 // set the number of rows we'll need for the table
160<a name="x2790"></a> <a href="qtable.html#setNumRows">setNumRows</a>( all.<a href="qvaluelist.html#count">count</a>() + 1 );
161 i = 0;
162 int sum = 0;
163
164 // insert the data into the table
165 for ( QStringList::Iterator it = all.<a href="qvaluelist.html#begin">begin</a>(); it != all.<a href="qvaluelist.html#end">end</a>(); ++it ) {
166 <a href="qtable.html#setText">setText</a>( i, 0, *it );
167 <a href="qfile.html">QFile</a> f( srcdir + *it );
168<a name="x2781"></a> <a href="qtable.html#setText">setText</a>( i, 1, QString::number( (ulong)f.<a href="qfile.html#size">size</a>() ) );
169 ComboItem *ci = new ComboItem( this, QTableItem::WhenCurrent );
170 <a href="qtable.html#setItem">setItem</a>( i++, 2, ci );
171 sum += f.<a href="qfile.html#size">size</a>();
172 }
173
174 // last row should show the sum
175 TableItem *i1 = new TableItem( this, QTableItem::Never, tr( "Sum" ) );
176 <a href="qtable.html#setItem">setItem</a>( i, 0, i1 );
177 TableItem *i2 = new TableItem( this, QTableItem::Never, QString::number( sum ) );
178 <a href="qtable.html#setItem">setItem</a>( i, 1, i2 );
179}
180
181void <a name="f580"></a>Table::recalcSum( int, int col )
182{
183 // only recalc if a value in the second or third column changed
184 if ( col &lt; 1 || col &gt; 2 )
185 return;
186
187 // recalc sum
188 int sum = 0;
189 for ( int i = 0; i &lt; numRows() - 1; ++i ) {
190 if ( <a href="qtableitem.html#text">text</a>( i, 2 ) == "No" )
191 continue;
192 sum += <a href="qtableitem.html#text">text</a>( i, 1 ).toInt();
193 }
194
195 // insert calculated data
196 TableItem *i1 = new TableItem( this, QTableItem::Never, tr( "Sum" ) );
197 setItem( numRows() - 1, 0, i1 );
198 TableItem *i2 = new TableItem( this, QTableItem::Never, QString::number( sum ) );
199 setItem( numRows() - 1, 1, i2 );
200}
201
202<a name="x2784"></a>void Table::<a href="qtable.html#sortColumn">sortColumn</a>( int col, bool ascending, bool /*wholeRows*/ )
203{
204 // sum row should not be sorted, so get rid of it for now
205 clearCell( numRows() - 1, 0 );
206 clearCell( numRows() - 1, 1 );
207 // do sort
208 QTable::<a href="qtable.html#sortColumn">sortColumn</a>( col, ascending, TRUE );
209 // re-insert sum row
210 recalcSum( 0, 1 );
211}
212
213
214
215<a name="x2786"></a>void TableItem::<a href="qtableitem.html#paint">paint</a>( <a href="qpainter.html">QPainter</a> *p, const <a href="qcolorgroup.html">QColorGroup</a> &amp;cg, const <a href="qrect.html">QRect</a> &amp;cr, bool selected )
216{
217 <a href="qcolorgroup.html">QColorGroup</a> g( cg );
218 // last row is the sum row - we want to make it more visible by
219 // using a red background
220 if ( <a href="qtableitem.html#row">row</a>() == <a href="qtableitem.html#table">table</a>()-&gt;numRows() - 1 )
221<a name="x2779"></a> g.<a href="qcolorgroup.html#setColor">setColor</a>( QColorGroup::Base, red );
222 QTableItem::<a href="qtableitem.html#paint">paint</a>( p, g, cr, selected );
223}
224
225
226
227
228<a name="f577"></a>ComboItem::ComboItem( <a href="qtable.html">QTable</a> *t, EditType et )
229 : <a href="qtableitem.html">QTableItem</a>( t, et, "Yes" ), cb( 0 )
230{
231 // we do not want this item to be replaced
232 <a href="qtableitem.html#setReplaceable">setReplaceable</a>( FALSE );
233}
234
235<a name="x2785"></a>QWidget *ComboItem::<a href="qtableitem.html#createEditor">createEditor</a>() const
236{
237 // create an editor - a combobox in our case
238 ( (ComboItem*)this )-&gt;cb = new <a href="qcombobox.html">QComboBox</a>( <a href="qtableitem.html#table">table</a>()-&gt;viewport() );
239 QObject::<a href="qobject.html#connect">connect</a>( cb, SIGNAL( activated( int ) ), table(), SLOT( doValueChanged() ) );
240 cb-&gt;insertItem( "Yes" );
241 cb-&gt;insertItem( "No" );
242 // and initialize it
243 cb-&gt;setCurrentItem( <a href="qtableitem.html#text">text</a>() == "No" ? 1 : 0 );
244 return cb;
245}
246
247<a name="x2787"></a>void ComboItem::<a href="qtableitem.html#setContentFromEditor">setContentFromEditor</a>( <a href="qwidget.html">QWidget</a> *w )
248{
249 // the user changed the value of the combobox, so synchronize the
250 // value of the item (its text), with the value of the combobox
251<a name="x2783"></a> if ( w-&gt;<a href="qobject.html#inherits">inherits</a>( "QComboBox" ) )
252 <a href="qtableitem.html#setText">setText</a>( ( (QComboBox*)w )-&gt;currentText() );
253 else
254 QTableItem::<a href="qtableitem.html#setContentFromEditor">setContentFromEditor</a>( w );
255}
256
257<a name="x2788"></a>void ComboItem::<a href="qtableitem.html#setText">setText</a>( const <a href="qstring.html">QString</a> &amp;s )
258{
259 if ( cb ) {
260 // initialize the combobox from the text
261 if ( s == "No" )
262 cb-&gt;setCurrentItem( 1 );
263 else
264 cb-&gt;setCurrentItem( 0 );
265 }
266 QTableItem::<a href="qtableitem.html#setText">setText</a>( s );
267}
268</pre>
269
270<p> <hr>
271<p> Main:
272<p> <pre>/****************************************************************************
273** $Id: statistics-example.html 2051 2007-02-21 10:04:20Z chehrlic $
274**
275** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
276**
277** This file is part of an example program for Qt. This example
278** program may be used, distributed and modified without limitation.
279**
280*****************************************************************************/
281
282#include "statistics.h"
283#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
284int main( int argc, char **argv )
285{
286 <a href="qapplication.html">QApplication</a> a(argc,argv);
287
288 Table t;
289 a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &amp;t );
290 t.<a href="qwidget.html#show">show</a>();
291 return a.<a href="qapplication.html#exec">exec</a>();
292}
293</pre>
294
295<p>See also <a href="table-examples.html">Table Examples</a>.
296
297<!-- eof -->
298<p><address><hr><div align=center>
299<table width=100% cellspacing=0 border=0><tr>
300<td>Copyright &copy; 2007
301<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
302<td align=right><div align=right>Qt 3.3.8</div>
303</table></div></address></body>
304</html>
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