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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/widgets/qlistview.cpp:6377 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>QListViewItemIterator 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>QListViewItemIterator Class Reference</h1><p>The QListViewItemIterator class provides an iterator for collections of QListViewItems.<a href="#details">More...</a><p><tt>#include <<a href="qlistview-h.html">qlistview.h</a>></tt><p><a href="qlistviewitemiterator-members.html">List of all member functions.</a><h2>Public Members</h2><ul><li><div class=fn><a href="#QListViewItemIterator"><b>QListViewItemIterator</b></a> ()</div></li><li><div class=fn><a href="#QListViewItemIterator-2"><b>QListViewItemIterator</b></a> ( QListViewItem * item )</div></li><li><div class=fn><a href="#QListViewItemIterator-3"><b>QListViewItemIterator</b></a> ( const QListViewItemIterator & it )</div></li><li><div class=fn><a href="#QListViewItemIterator-4"><b>QListViewItemIterator</b></a> ( QListView * lv )</div></li><li><div class=fn>QListViewItemIterator & <a href="#operator-eq"><b>operator=</b></a> ( const QListViewItemIterator & it )</div></li><li><div class=fn><a href="#~QListViewItemIterator"><b>~QListViewItemIterator</b></a> ()</div></li><li><div class=fn>QListViewItemIterator & <a href="#operator++"><b>operator++</b></a> ()</div></li><li><div class=fn>const QListViewItemIterator <a href="#operator++-2"><b>operator++</b></a> ( int )</div></li><li><div class=fn>QListViewItemIterator & <a href="#operator+-eq"><b>operator+=</b></a> ( int j )</div></li><li><div class=fn>QListViewItemIterator & <a href="#operator--"><b>operator--</b></a> ()</div></li><li><div class=fn>const QListViewItemIterator <a href="#operator---2"><b>operator--</b></a> ( int )</div></li><li><div class=fn>QListViewItemIterator & <a href="#operator--eq"><b>operator-=</b></a> ( int j )</div></li><li><div class=fn>QListViewItem * <a href="#current"><b>current</b></a> () const</div></li></ul><hr><a name="details"></a><h2>Detailed Description</h2> <p> The QListViewItemIterator class provides an iterator for collections of QListViewItems.<p> Construct an instance of a QListViewItemIterator, with either a<a href="qlistview.html">QListView</a>* or a <a href="qlistviewitem.html">QListViewItem</a>* as argument, to operate on the treeof QListViewItems.<p> A QListViewItemIterator iterates over all items of a list view. Thismeans that it always makes the first child of the current item the newcurrent item. If there is no child, the next sibling becomes the newcurrent item; and if there is no next sibling, the next sibling ofthe parent becomes current.<p> The following example function gets a list of all the items thathave been selected by the user, storing pointers to the items in aQPtrList:<pre> <a href="qptrlist.html">QPtrList</a><QListViewItem> lst; QListViewItemIterator it( lv ); while ( it.<a href="#current">current</a>() != 0 ) { if ( it.<a href="#current">current</a>()->isSelected() ) lst.<a href="qptrlist.html#append">append</a>( it.<a href="#current">current</a>() ); ++it; } </pre> <p> A QListViewItemIterator provides a convenient and easy way totraverse a hierarchical <a href="qlistview.html">QListView</a>.<p> Multiple QListViewItemIterators can operate on the tree ofQListViewItems. A QListView knows about all iterators operating onits QListViewItems. So when a <a href="qlistviewitem.html">QListViewItem</a> gets removed alliterators that point to this item are updated and point to thefollowing item if possible, otherwise to a valid item before thecurrent one or to 0.<p> <p>See also <a href="qlistview.html">QListView</a>, <a href="qlistviewitem.html">QListViewItem</a> and <a href="advanced.html">Advanced Widgets</a>.<hr><h2>Member Function Documentation</h2><h3 class=fn><a name="QListViewItemIterator"></a>QListViewItemIterator::QListViewItemIterator ()</h3> Constructs an empty iterator. <h3 class=fn><a name="QListViewItemIterator-2"></a>QListViewItemIterator::QListViewItemIterator ( <a href="qlistviewitem.html">QListViewItem</a> * item )</h3> Constructs an iterator for the <a href="qlistview.html">QListView</a> of the <em>item</em>. Thecurrent iterator item is set to point to the <em>item</em>.<h3 class=fn><a name="QListViewItemIterator-3"></a>QListViewItemIterator::QListViewItemIterator ( const <a href="qlistviewitemiterator.html">QListViewItemIterator</a> & it )</h3> Constructs an iterator for the same <a href="qlistview.html">QListView</a> as <em>it</em>. Thecurrent iterator item is set to point on the current item of <em>it</em>.<h3 class=fn><a name="QListViewItemIterator-4"></a>QListViewItemIterator::QListViewItemIterator ( <a href="qlistview.html">QListView</a> * lv )</h3> Constructs an iterator for the <a href="qlistview.html">QListView</a> <em>lv</em>. The currentiterator item is set to point on the first child (<a href="qlistviewitem.html">QListViewItem</a>)of <em>lv</em>.<h3 class=fn><a name="~QListViewItemIterator"></a>QListViewItemIterator::~QListViewItemIterator ()</h3> Destroys the iterator.<h3 class=fn><a href="qlistviewitem.html">QListViewItem</a> * <a name="current"></a>QListViewItemIterator::current () const</h3> Returns a pointer to the current item of the iterator.<p>Examples: <a href="addressbook-example.html#x546">addressbook/centralwidget.cpp</a>, <a href="checklists-example.html#x430">checklists/checklists.cpp</a>, <a href="dirview-example.html#x1734">dirview/dirview.cpp</a> and <a href="ftpclient-example.html#x692">network/ftpclient/ftpview.cpp</a>.<h3 class=fn><a href="qlistviewitemiterator.html">QListViewItemIterator</a> & <a name="operator++"></a>QListViewItemIterator::operator++ ()</h3> Prefix ++ makes the next item in the <a href="qlistviewitem.html">QListViewItem</a> tree of the<a href="qlistview.html">QListView</a> of the iterator the current item and returns it. If thecurrent item was the last item in the QListView or null, null isreturned.<h3 class=fn>const <a href="qlistviewitemiterator.html">QListViewItemIterator</a> <a name="operator++-2"></a>QListViewItemIterator::operator++ ( int )</h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.<p> Postfix ++ makes the next item in the <a href="qlistviewitem.html">QListViewItem</a> tree of the<a href="qlistview.html">QListView</a> of the iterator the current item and returns the itemwhich was previously current.<h3 class=fn><a href="qlistviewitemiterator.html">QListViewItemIterator</a> & <a name="operator+-eq"></a>QListViewItemIterator::operator+= ( int j )</h3>Sets the current item to the item <em>j</em> positions after the currentitem in the <a href="qlistviewitem.html">QListViewItem</a> hierarchy. If this item is beyond the lastitem, the current item is set to null.<p> The new current item (or null, if the new current item is null) is returned.<h3 class=fn><a href="qlistviewitemiterator.html">QListViewItemIterator</a> & <a name="operator--"></a>QListViewItemIterator::operator-- ()</h3>Prefix -- makes the previous item in the <a href="qlistviewitem.html">QListViewItem</a> tree of the<a href="qlistview.html">QListView</a> of the iterator the current item and returns it. If thecurrent item was the last first in the QListView or null, null isreturned.<h3 class=fn>const <a href="qlistviewitemiterator.html">QListViewItemIterator</a> <a name="operator---2"></a>QListViewItemIterator::operator-- ( int )</h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.<p> Postfix -- makes the previous item in the <a href="qlistviewitem.html">QListViewItem</a> tree ofthe <a href="qlistview.html">QListView</a> of the iterator the current item and returns the item.<h3 class=fn><a href="qlistviewitemiterator.html">QListViewItemIterator</a> & <a name="operator--eq"></a>QListViewItemIterator::operator-= ( int j )</h3> Sets the current item to the item <em>j</em> positions before thecurrent item in the <a href="qlistviewitem.html">QListViewItem</a> hierarchy. If this item is beforethe first item, the current item is set to null. The new currentitem (or null, if the new current item is null) is returned.<h3 class=fn><a href="qlistviewitemiterator.html">QListViewItemIterator</a> & <a name="operator-eq"></a>QListViewItemIterator::operator= ( const <a href="qlistviewitemiterator.html">QListViewItemIterator</a> & it )</h3> Assignment. Makes a copy of <em>it</em> and returns a reference to itsiterator.<!-- 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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