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159 lines
7.0 KiB
159 lines
7.0 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qabstractlayout.cpp:1569 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>QLayoutIterator Class</title>
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<style type="text/css"><!--
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fn { margin-left: 1cm; text-indent: -1cm; }
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--></style>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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| <a href="classes.html">
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Main Classes</font></a>
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<font color="#004faf">Annotated</font></a>
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<font color="#004faf">Grouped Classes</font></a>
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<font color="#004faf">Functions</font></a>
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</td>
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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>QLayoutIterator Class Reference</h1>
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<p>The QLayoutIterator class provides iterators over QLayoutItem.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qlayout-h.html">qlayout.h</a>></tt>
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<p><a href="qlayoutiterator-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#QLayoutIterator"><b>QLayoutIterator</b></a> ( QGLayoutIterator * gi )</li>
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<li class=fn><a href="#QLayoutIterator-2"><b>QLayoutIterator</b></a> ( const QLayoutIterator & i )</li>
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<li class=fn><a href="#~QLayoutIterator"><b>~QLayoutIterator</b></a> ()</li>
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<li class=fn>QLayoutIterator & <a href="#operator-eq"><b>operator=</b></a> ( const QLayoutIterator & i )</li>
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<li class=fn>QLayoutItem * <a href="#operator++"><b>operator++</b></a> ()</li>
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<li class=fn>QLayoutItem * <a href="#current"><b>current</b></a> ()</li>
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<li class=fn>QLayoutItem * <a href="#takeCurrent"><b>takeCurrent</b></a> ()</li>
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<li class=fn>void <a href="#deleteCurrent"><b>deleteCurrent</b></a> ()</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QLayoutIterator class provides iterators over <a href="qlayoutitem.html">QLayoutItem</a>.
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<p>
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<p> Use <a href="qlayoutitem.html#iterator">QLayoutItem::iterator</a>() to create an iterator over a layout.
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<p> QLayoutIterator uses <em>explicit</em> sharing with a reference count.
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If an iterator is copied and one of the copies is modified, both
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iterators will be modified.
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<p> A QLayoutIterator is not protected against changes in its layout. If
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the layout is modified or deleted the iterator will become invalid.
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It is not possible to test for validity. It is safe to delete an
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invalid layout; any other access may lead to an illegal memory
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reference and the abnormal termination of the program.
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<p> Calling <a href="#takeCurrent">takeCurrent</a>() or <a href="#deleteCurrent">deleteCurrent</a>() leaves the iterator in a
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valid state, but may invalidate any other iterators that access the
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same layout.
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<p> The following code will draw a rectangle for each layout item in
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the layout structure of the widget.
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<pre>
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static void paintLayout( <a href="qpainter.html">QPainter</a> *p, QLayoutItem *lay )
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{
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QLayoutIterator it = lay->iterator();
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<a href="qlayoutitem.html">QLayoutItem</a> *child;
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while ( (child = it.<a href="#current">current</a>()) != 0 ) {
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paintLayout( p, child );
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++it;
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}
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p-><a href="qpainter.html#drawRect">drawRect</a>( lay->geometry() );
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}
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void ExampleWidget::paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * )
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{
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<a href="qpainter.html">QPainter</a> p( this );
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if ( layout() )
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paintLayout( &p, layout() );
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}
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</pre>
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<p> All the functionality of QLayoutIterator is implemented by
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subclasses of <a href="qglayoutiterator.html">QGLayoutIterator</a>. QLayoutIterator itself is not
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designed to be subclassed.
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<p>See also <a href="appearance.html">Widget Appearance and Style</a> and <a href="geomanagement.html">Layout Management</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QLayoutIterator"></a>QLayoutIterator::QLayoutIterator ( <a href="qglayoutiterator.html">QGLayoutIterator</a> * gi )
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</h3>
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<p> Constructs an iterator based on <em>gi</em>. The constructed iterator
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takes ownership of <em>gi</em> and will delete it.
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<p> This constructor is provided for layout implementors. Application
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programmers should use <a href="qlayoutitem.html#iterator">QLayoutItem::iterator</a>() to create an
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iterator over a layout.
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<h3 class=fn><a name="QLayoutIterator-2"></a>QLayoutIterator::QLayoutIterator ( const <a href="qlayoutiterator.html">QLayoutIterator</a> & i )
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</h3>
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<p> Creates a <a href="shclass.html#shallow-copy">shallow copy</a> of <em>i</em>, i.e. if the copy is modified, then
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the original will also be modified.
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<h3 class=fn><a name="~QLayoutIterator"></a>QLayoutIterator::~QLayoutIterator ()
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</h3>
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<p> Destroys the iterator.
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<h3 class=fn><a href="qlayoutitem.html">QLayoutItem</a> * <a name="current"></a>QLayoutIterator::current ()
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</h3>
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<p> Returns the current item, or 0 if there is no current item.
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<h3 class=fn>void <a name="deleteCurrent"></a>QLayoutIterator::deleteCurrent ()
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</h3>
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<p> Removes and deletes the current child item from the layout and
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moves the iterator to the next item. This iterator will still be
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valid, but any other iterator over the same layout may become
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invalid.
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<h3 class=fn><a href="qlayoutitem.html">QLayoutItem</a> * <a name="operator++"></a>QLayoutIterator::operator++ ()
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</h3>
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<p> Moves the iterator to the next child item and returns that item,
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or 0 if there is no such item.
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<h3 class=fn><a href="qlayoutiterator.html">QLayoutIterator</a> & <a name="operator-eq"></a>QLayoutIterator::operator= ( const <a href="qlayoutiterator.html">QLayoutIterator</a> & i )
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</h3>
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<p> Assigns <em>i</em> to this iterator and returns a reference to this
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iterator.
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<h3 class=fn><a href="qlayoutitem.html">QLayoutItem</a> * <a name="takeCurrent"></a>QLayoutIterator::takeCurrent ()
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</h3>
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<p> Removes the current child item from the layout without deleting
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it, and moves the iterator to the next item. Returns the removed
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item, or 0 if there was no item to be removed. This iterator will
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still be valid, but any other iterator over the same layout may
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become invalid.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">Qt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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