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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   3.0.2   edited Oct 12 12:18 $
**
** Copyright (C) 1992-2000 Trolltech AS.  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 &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
#include &lt;<a href="qtable-h.html">qtable.h</a>&gt;

// 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="x380"></a>        items.<a href="qptrcollection.html#setAutoDelete">setAutoDelete</a>( TRUE );
        widgets.<a href="qptrcollection.html#setAutoDelete">setAutoDelete</a>( TRUE );
        setCaption( tr( "This is a big table with 1.000.000x1.000.000 cells..." ) );
        setLeftMargin( fontMetrics().width( "W999999W" ) );
    }

    void resizeData( int ) {}
<a name="x377"></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="x379"></a>    void setItem( int r, int c, QTableItem *i ) { items.<a href="qintdict.html#replace">replace</a>( indexOf( r, c ), i ); }
<a name="x378"></a>    void clearCell( int r, int c ) { items.<a href="qintdict.html#remove">remove</a>( indexOf( r, c ) ); }
    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 ) { widgets.<a href="qintdict.html#remove">remove</a>( indexOf( r, c ) ); }

private:
    <a href="qintdict.html">QIntDict</a>&lt;QTableItem&gt; items;
    <a href="qintdict.html">QIntDict</a>&lt;QWidget&gt; 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>( &amp;table );
    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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