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<title>How to create a large, sparse QTable</title>
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<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>.
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