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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/src/kernel/qfocusdata.cpp:40 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>QFocusData Class</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; }--></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>QFocusData Class Reference</h1><p>The QFocusData class maintains the list of widgets in the focuschain.<a href="#details">More...</a><p><tt>#include <<a href="qfocusdata-h.html">qfocusdata.h</a>></tt><p><a href="qfocusdata-members.html">List of all member functions.</a><h2>Public Members</h2><ul><li><div class=fn>QWidget * <a href="#focusWidget"><b>focusWidget</b></a> () const</div></li><li><div class=fn>QWidget * <a href="#home"><b>home</b></a> ()</div></li><li><div class=fn>QWidget * <a href="#next"><b>next</b></a> ()</div></li><li><div class=fn>QWidget * <a href="#prev"><b>prev</b></a> ()</div></li><li><div class=fn>int <a href="#count"><b>count</b></a> () const</div></li></ul><hr><a name="details"></a><h2>Detailed Description</h2>The QFocusData class maintains the list of widgets in the focuschain.<p> <p> This read-only list always contains at least one widget (i.e. thetop-level widget). It provides a simple cursor which can be resetto the current focus widget using <a href="#home">home</a>(), or moved to itsneighboring widgets using <a href="#next">next</a>() and <a href="#prev">prev</a>(). You can also retrievethe <a href="#count">count</a>() of the number of widgets in the list. The list is aloop, so if you keep iterating, for example using next(), you willnever come to the end.<p> Some widgets in the list may not accept focus. Widgets are addedto the list as necessary, but not removed from it. This letswidgets change focus policy dynamically without disrupting thefocus chain the user experiences. When a widget disables andre-enables tab focus, its position in the focus chain does notchange.<p> When reimplementing <a href="qwidget.html#focusNextPrevChild">QWidget::focusNextPrevChild</a>() to providespecial focus flow, you will usually call <a href="qwidget.html#focusData">QWidget::focusData</a>() toretrieve the focus data stored at the top-level widget. Atop-level widget's focus data contains the focus list for itshierarchy of widgets.<p> The cursor may change at any time.<p> This class is <em>not</em> thread-safe.<p> <p>See also <a href="qwidget.html#focusNextPrevChild">QWidget::focusNextPrevChild</a>(), <a href="qwidget.html#setTabOrder">QWidget::setTabOrder</a>(), <a href="qwidget.html#focusPolicy-prop">QWidget::focusPolicy</a> and <a href="misc.html">Miscellaneous Classes</a>.<hr><h2>Member Function Documentation</h2><h3 class=fn>int <a name="count"></a>QFocusData::count () const</h3><p> Returns the number of widgets in the focus chain.<h3 class=fn><a href="qwidget.html">QWidget</a> * <a name="focusWidget"></a>QFocusData::focusWidget () const</h3><p> Returns the widgets in the hierarchy that are in the focus chain.<h3 class=fn><a href="qwidget.html">QWidget</a> * <a name="home"></a>QFocusData::home ()</h3>Moves the cursor to the <a href="#focusWidget">focusWidget</a>() and returns that widget. Youmust call this before <a href="#next">next</a>() or <a href="#prev">prev</a>() to iterate meaningfully.<h3 class=fn><a href="qwidget.html">QWidget</a> * <a name="next"></a>QFocusData::next ()</h3>Moves the cursor to the next widget in the focus chain. There is<em>always</em> a next widget because the list is a loop.<h3 class=fn><a href="qwidget.html">QWidget</a> * <a name="prev"></a>QFocusData::prev ()</h3>Moves the cursor to the previous widget in the focus chain. Thereis <em>always</em> a previous widget because the list is a loop.<!-- eof --><hr><p>This file is part of the <a href="index.html">Qt toolkit</a>.Copyright © 1995-2002<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<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 align=right><div align=right>Qt version 3.0.5</div></table></div></address></body></html>⌨️ 快捷键说明
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