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| author | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
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| committer | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
| commit | bd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch) | |
| tree | 7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/bigtable-example.html | |
| download | qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip | |
Add Qt3 development HEAD version
Diffstat (limited to 'doc/html/bigtable-example.html')
| -rw-r--r-- | doc/html/bigtable-example.html | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/doc/html/bigtable-example.html b/doc/html/bigtable-example.html new file mode 100644 index 0000000..8342c4c --- /dev/null +++ b/doc/html/bigtable-example.html @@ -0,0 +1,115 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/table/bigtable/bigtable.doc:5 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>How to create a large, sparse QTable</title> +<style type="text/css"><!-- +fn { margin-left: 1cm; text-indent: -1cm; } +a:link { color: #004faf; text-decoration: none } +a:visited { color: #672967; text-decoration: none } +body { background: #ffffff; color: black; } +--></style> +</head> +<body> + +<table border="0" cellpadding="0" cellspacing="0" width="100%"> +<tr bgcolor="#E5E5E5"> +<td valign=center> + <a href="index.html"> +<font color="#004faf">Home</font></a> + | <a href="classes.html"> +<font color="#004faf">All Classes</font></a> + | <a href="mainclasses.html"> +<font color="#004faf">Main Classes</font></a> + | <a href="annotated.html"> +<font color="#004faf">Annotated</font></a> + | <a href="groups.html"> +<font color="#004faf">Grouped Classes</font></a> + | <a href="functions.html"> +<font color="#004faf">Functions</font></a> +</td> +<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>How to create a large, sparse QTable</h1> + + +<p> +<p> This example shows a sparse table implementation using a <a href="qintdict.html">QIntDict</a> to +keep track of the cells that are actually in use. +<p> <hr> +<p> Implementation: +<p> <pre>/**************************************************************************** +** $Id: qt/main.cpp 3.3.8 edited Jan 11 14:37 $ +** +** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. +** +** This file is part of an example program for Qt. This example +** program may be used, distributed and modified without limitation. +** +*****************************************************************************/ + +#include <<a href="qapplication-h.html">qapplication.h</a>> +#include <<a href="qtable-h.html">qtable.h</a>> + +// Table size + +const int numRows = 1000000; +const int numCols = 1000000; + +class MyTable : public <a href="qtable.html">QTable</a> +{ +public: + MyTable( int r, int c ) : <a href="qtable.html">QTable</a>( r, c ) { +<a name="x1291"></a> items.<a href="qptrcollection.html#setAutoDelete">setAutoDelete</a>( TRUE ); + widgets.<a href="qptrcollection.html#setAutoDelete">setAutoDelete</a>( TRUE ); + setCaption( tr( "A 1 Million x 1 Million Cell Table" ) ); + setLeftMargin( fontMetrics().width( "W999999W" ) ); + } + + void resizeData( int ) {} +<a name="x1286"></a> <a href="qtableitem.html">QTableItem</a> *item( int r, int c ) const { return items.<a href="qintdict.html#find">find</a>( indexOf( r, c ) ); } +<a name="x1288"></a> void setItem( int r, int c, QTableItem *i ) { items.<a href="qintdict.html#replace">replace</a>( indexOf( r, c ), i ); } +<a name="x1287"></a> void clearCell( int r, int c ) { items.<a href="qintdict.html#remove">remove</a>( indexOf( r, c ) ); } + void takeItem( <a href="qtableitem.html">QTableItem</a> *item ) + { + items.<a href="qptrcollection.html#setAutoDelete">setAutoDelete</a>( FALSE ); +<a name="x1294"></a><a name="x1293"></a> items.<a href="qintdict.html#remove">remove</a>( indexOf( item-><a href="qtableitem.html#row">row</a>(), item-><a href="qtableitem.html#col">col</a>() ) ); + items.<a href="qptrcollection.html#setAutoDelete">setAutoDelete</a>( TRUE ); + } + void insertWidget( int r, int c, QWidget *w ) { widgets.<a href="qintdict.html#replace">replace</a>( indexOf( r, c ), w ); } + <a href="qwidget.html">QWidget</a> *cellWidget( int r, int c ) const { return widgets.<a href="qintdict.html#find">find</a>( indexOf( r, c ) ); } + void clearCellWidget( int r, int c ) + { +<a name="x1289"></a> <a href="qwidget.html">QWidget</a> *w = widgets.<a href="qintdict.html#take">take</a>( indexOf( r, c ) ); + if ( w ) +<a name="x1290"></a> w-><a href="qobject.html#deleteLater">deleteLater</a>(); + } + +private: + <a href="qintdict.html">QIntDict</a><QTableItem> items; + <a href="qintdict.html">QIntDict</a><QWidget> widgets; + +}; + +// The program starts here. + +int main( int argc, char **argv ) +{ + <a href="qapplication.html">QApplication</a> app( argc, argv ); + + MyTable table( numRows, numCols ); + app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &table ); +<a name="x1292"></a> table.<a href="qwidget.html#show">show</a>(); + return app.<a href="qapplication.html#exec">exec</a>(); +} +</pre> + +<p> <p>See also <a href="table-examples.html">Table Examples</a>. + +<!-- eof --> +<p><address><hr><div align=center> +<table width=100% cellspacing=0 border=0><tr> +<td>Copyright © 2007 +<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> +<td align=right><div align=right>Qt 3.3.8</div> +</table></div></address></body> +</html> |