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227 lines
13 KiB
227 lines
13 KiB
14 years ago
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/widgets/qlistview.cpp:7335 -->
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>QListViewItemIterator Class</title>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Functions</font></a>
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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>QListViewItemIterator Class Reference</h1>
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<p>The QListViewItemIterator class provides an iterator for collections of QListViewItems.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qlistview-h.html">qlistview.h</a>></tt>
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<p><a href="qlistviewitemiterator-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>enum <a href="#IteratorFlag-enum"><b>IteratorFlag</b></a> { Visible = 0x00000001, Invisible = 0x00000002, Selected = 0x00000004, Unselected = 0x00000008, Selectable = 0x00000010, NotSelectable = 0x00000020, DragEnabled = 0x00000040, DragDisabled = 0x00000080, DropEnabled = 0x00000100, DropDisabled = 0x00000200, Expandable = 0x00000400, NotExpandable = 0x00000800, Checked = 0x00001000, NotChecked = 0x00002000 }</li>
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<li class=fn><a href="#QListViewItemIterator"><b>QListViewItemIterator</b></a> ()</li>
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<li class=fn><a href="#QListViewItemIterator-2"><b>QListViewItemIterator</b></a> ( QListViewItem * item )</li>
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<li class=fn><a href="#QListViewItemIterator-3"><b>QListViewItemIterator</b></a> ( QListViewItem * item, int iteratorFlags )</li>
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<li class=fn><a href="#QListViewItemIterator-4"><b>QListViewItemIterator</b></a> ( const QListViewItemIterator & it )</li>
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<li class=fn><a href="#QListViewItemIterator-5"><b>QListViewItemIterator</b></a> ( QListView * lv )</li>
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<li class=fn><a href="#QListViewItemIterator-6"><b>QListViewItemIterator</b></a> ( QListView * lv, int iteratorFlags )</li>
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<li class=fn>QListViewItemIterator & <a href="#operator-eq"><b>operator=</b></a> ( const QListViewItemIterator & it )</li>
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<li class=fn><a href="#~QListViewItemIterator"><b>~QListViewItemIterator</b></a> ()</li>
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<li class=fn>QListViewItemIterator & <a href="#operator++"><b>operator++</b></a> ()</li>
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<li class=fn>const QListViewItemIterator <a href="#operator++-2"><b>operator++</b></a> ( int )</li>
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<li class=fn>QListViewItemIterator & <a href="#operator+-eq"><b>operator+=</b></a> ( int j )</li>
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<li class=fn>QListViewItemIterator & <a href="#operator--"><b>operator--</b></a> ()</li>
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<li class=fn>const QListViewItemIterator <a href="#operator---2"><b>operator--</b></a> ( int )</li>
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<li class=fn>QListViewItemIterator & <a href="#operator--eq"><b>operator-=</b></a> ( int j )</li>
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<li class=fn>QListViewItem * <a href="#operator*"><b>operator*</b></a> ()</li>
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<li class=fn>QListViewItem * <a href="#current"><b>current</b></a> () const</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QListViewItemIterator class provides an iterator for collections of QListViewItems.
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<p>
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<p> Construct an instance of a QListViewItemIterator, with either a
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<a href="qlistview.html">QListView</a>* or a <a href="qlistviewitem.html">QListViewItem</a>* as argument, to operate on the tree
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of QListViewItems, starting from the argument.
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<p> A QListViewItemIterator iterates over all the items from its
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starting point. This means that it always makes the first child of
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the current item the new current item. If there is no child, the
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next sibling becomes the new current item; and if there is no next
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sibling, the next sibling of the parent becomes current.
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<p> The following example creates a list of all the items that have
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been selected by the user, storing pointers to the items in a
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QPtrList:
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<pre>
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<a href="qptrlist.html">QPtrList</a><QListViewItem> lst;
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QListViewItemIterator it( myListView );
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while ( it.<a href="#current">current</a>() ) {
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if ( it.<a href="#current">current</a>()->isSelected() )
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lst.<a href="qptrlist.html#append">append</a>( it.<a href="#current">current</a>() );
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++it;
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}
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</pre>
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<p> An alternative approach is to use an <a href="#IteratorFlag-enum">IteratorFlag</a>:
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<pre>
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<a href="qptrlist.html">QPtrList</a><QListViewItem> lst;
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QListViewItemIterator it( myListView, QListViewItemIterator::<a href="#IteratorFlag-enum">Selected</a> );
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while ( it.<a href="#current">current</a>() ) {
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lst.<a href="qptrlist.html#append">append</a>( it.<a href="#current">current</a>() );
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++it;
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}
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</pre>
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<p> A QListViewItemIterator provides a convenient and easy way to
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traverse a hierarchical <a href="qlistview.html">QListView</a>.
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<p> Multiple QListViewItemIterators can operate on the tree of
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QListViewItems. A QListView knows about all iterators operating on
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its QListViewItems. So when a <a href="qlistviewitem.html">QListViewItem</a> gets removed all
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iterators that point to this item are updated and point to the
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following item if possible, otherwise to a valid item before the
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current one or to 0. Note however that deleting the parent item of
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an item that an iterator points to is not safe.
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<p> <p>See also <a href="qlistview.html">QListView</a>, <a href="qlistviewitem.html">QListViewItem</a>, and <a href="advanced.html">Advanced Widgets</a>.
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<hr><h2>Member Type Documentation</h2>
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<h3 class=fn><a name="IteratorFlag-enum"></a>QListViewItemIterator::IteratorFlag</h3>
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<p> These flags can be passed to a QListViewItemIterator constructor
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(OR-ed together if more than one is used), so that the iterator
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will only iterate over items that match the given flags.
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<ul>
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<li><tt>QListViewItemIterator::Visible</tt>
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<li><tt>QListViewItemIterator::Invisible</tt>
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<li><tt>QListViewItemIterator::Selected</tt>
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<li><tt>QListViewItemIterator::Unselected</tt>
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<li><tt>QListViewItemIterator::Selectable</tt>
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<li><tt>QListViewItemIterator::NotSelectable</tt>
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<li><tt>QListViewItemIterator::DragEnabled</tt>
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<li><tt>QListViewItemIterator::DragDisabled</tt>
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<li><tt>QListViewItemIterator::DropEnabled</tt>
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<li><tt>QListViewItemIterator::DropDisabled</tt>
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<li><tt>QListViewItemIterator::Expandable</tt>
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<li><tt>QListViewItemIterator::NotExpandable</tt>
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<li><tt>QListViewItemIterator::Checked</tt>
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<li><tt>QListViewItemIterator::NotChecked</tt>
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</ul>
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QListViewItemIterator"></a>QListViewItemIterator::QListViewItemIterator ()
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</h3>
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Constructs an empty iterator.
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<h3 class=fn><a name="QListViewItemIterator-2"></a>QListViewItemIterator::QListViewItemIterator ( <a href="qlistviewitem.html">QListViewItem</a> * item )
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</h3>
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Constructs an iterator for the <a href="qlistview.html">QListView</a> that contains the <em>item</em>. The current iterator item is set to point to the <em>item</em>.
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<h3 class=fn><a name="QListViewItemIterator-3"></a>QListViewItemIterator::QListViewItemIterator ( <a href="qlistviewitem.html">QListViewItem</a> * item, int iteratorFlags )
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</h3>
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Constructs an iterator for the <a href="qlistview.html">QListView</a> that contains the <em>item</em>
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using the flags <em>iteratorFlags</em>. The current iterator item is set
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to point to <em>item</em> or the next matching item if <em>item</em> doesn't
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match the flags.
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<p> <p>See also <a href="#IteratorFlag-enum">QListViewItemIterator::IteratorFlag</a>.
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<h3 class=fn><a name="QListViewItemIterator-4"></a>QListViewItemIterator::QListViewItemIterator ( const <a href="qlistviewitemiterator.html">QListViewItemIterator</a> & it )
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</h3>
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Constructs an iterator for the same <a href="qlistview.html">QListView</a> as <em>it</em>. The
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current iterator item is set to point on the current item of <em>it</em>.
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<h3 class=fn><a name="QListViewItemIterator-5"></a>QListViewItemIterator::QListViewItemIterator ( <a href="qlistview.html">QListView</a> * lv )
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</h3>
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Constructs an iterator for the <a href="qlistview.html">QListView</a> <em>lv</em>. The current
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iterator item is set to point on the first child (<a href="qlistviewitem.html">QListViewItem</a>)
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of <em>lv</em>.
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<h3 class=fn><a name="QListViewItemIterator-6"></a>QListViewItemIterator::QListViewItemIterator ( <a href="qlistview.html">QListView</a> * lv, int iteratorFlags )
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</h3>
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Constructs an iterator for the <a href="qlistview.html">QListView</a> <em>lv</em> with the flags <em>iteratorFlags</em>. The current iterator item is set to point on the
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first child (<a href="qlistviewitem.html">QListViewItem</a>) of <em>lv</em> that matches the flags.
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<p> <p>See also <a href="#IteratorFlag-enum">QListViewItemIterator::IteratorFlag</a>.
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<h3 class=fn><a name="~QListViewItemIterator"></a>QListViewItemIterator::~QListViewItemIterator ()
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</h3>
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Destroys the iterator.
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<h3 class=fn><a href="qlistviewitem.html">QListViewItem</a> * <a name="current"></a>QListViewItemIterator::current () const
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</h3>
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Returns iterator's current item.
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<p>Examples: <a href="addressbook-example.html#x597">addressbook/centralwidget.cpp</a>, <a href="checklists-example.html#x432">checklists/checklists.cpp</a>, and <a href="dirview-example.html#x1694">dirview/dirview.cpp</a>.
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<h3 class=fn><a href="qlistviewitem.html">QListViewItem</a> * <a name="operator*"></a>QListViewItemIterator::operator* ()
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</h3>
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Dereference operator. Returns a reference to the current item. The
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same as <a href="#current">current</a>().
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<h3 class=fn><a href="qlistviewitemiterator.html">QListViewItemIterator</a> & <a name="operator++"></a>QListViewItemIterator::operator++ ()
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</h3>
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Prefix ++. Makes the next item the new current item and returns
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it. Returns 0 if the current item is the last item or the
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<a href="qlistview.html">QListView</a> is 0.
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<h3 class=fn>const <a href="qlistviewitemiterator.html">QListViewItemIterator</a> <a name="operator++-2"></a>QListViewItemIterator::operator++ ( int )
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Postfix ++. Makes the next item the new current item and returns
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the item that <em>was</em> the current item.
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<h3 class=fn><a href="qlistviewitemiterator.html">QListViewItemIterator</a> & <a name="operator+-eq"></a>QListViewItemIterator::operator+= ( int j )
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</h3>
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Sets the current item to the item <em>j</em> positions after the current
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item. If that item is beyond the last item, the current item is
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set to 0. Returns the current item.
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<h3 class=fn><a href="qlistviewitemiterator.html">QListViewItemIterator</a> & <a name="operator--"></a>QListViewItemIterator::operator-- ()
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</h3>
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Prefix --. Makes the previous item the new current item and
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returns it. Returns 0 if the current item is the first item or the
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<a href="qlistview.html">QListView</a> is 0.
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<h3 class=fn>const <a href="qlistviewitemiterator.html">QListViewItemIterator</a> <a name="operator---2"></a>QListViewItemIterator::operator-- ( int )
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Postfix --. Makes the previous item the new current item and
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returns the item that <em>was</em> the current item.
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<h3 class=fn><a href="qlistviewitemiterator.html">QListViewItemIterator</a> & <a name="operator--eq"></a>QListViewItemIterator::operator-= ( int j )
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</h3>
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Sets the current item to the item <em>j</em> positions before the
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current item. If that item is before the first item, the current
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item is set to 0. Returns the current item.
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<h3 class=fn><a href="qlistviewitemiterator.html">QListViewItemIterator</a> & <a name="operator-eq"></a>QListViewItemIterator::operator= ( const <a href="qlistviewitemiterator.html">QListViewItemIterator</a> & it )
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</h3>
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Assignment. Makes a copy of <em>it</em> and returns a reference to its
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iterator.
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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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