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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/examples/table/bigtable/bigtable.doc:5 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><meta name="Translator" content="farfareast"><meta name="Qt zh_CN Documents Website" content="http://www.qiliang.net/qt"><title>如何生成大的稀疏QTable</title><style type="text/css"><!--h3.fn,span.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; font-family: "Times New Roman" }--></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">主页</font></a> | <a href="classes.html"><font color="#004faf">所有的类</font></a> | <a href="mainclasses.html"><font color="#004faf">主要的类</font></a> | <a href="annotated.html"><font color="#004faf">注释的类</font></a> | <a href="groups.html"><font color="#004faf">分组的类</font></a> | <a href="functions.html"><font color="#004faf">函数</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>如何生成大的稀疏QTable</h1> <p> <p>本样例显示一个稀疏表格的实现，它使用<a href="qintdict.html">QIntDict</a>以跟踪实际使用的单元格的记录。<p> <hr><p>实现：<p> <pre>/****************************************************************************** $Id: qt/main.cpp 3.0.5 edited Oct 12 2001 $**** 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 <<a href="qapplication-h.html">qapplication.h</a>>#include <<a href="qtable-h.html">qtable.h</a>>// Table sizeconst 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="x1489"></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="x1486"></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="x1488"></a> void setItem( int r, int c, QTableItem *i ) { items.<a href="qintdict.html#replace">replace</a>( indexOf( r, c ), i ); }<a name="x1487"></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><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="x1490"></a> table.<a href="qwidget.html#show">show</a>(); return app.<a href="qapplication.html#exec">exec</a>();}</pre><p> <p>也参见<a href="table-examples.html">表格例程</a>。<!-- eof --><p><address><hr><div align=center><table width=100% cellspacing=0 border=0><tr><td>Copyright © 2002 <a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a><td><a href="zh_CN.html">译者:farfareast</a><td align=right><div align=right>Qt 3.0.5版</div></table></div></address></body></html>⌨️ 快捷键说明
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