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226 lines
13 KiB
226 lines
13 KiB
13 years ago
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>TQListViewItemIterator Class</title>
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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>TQListViewItemIterator Class Reference</h1>
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<p>The TQListViewItemIterator class provides an iterator for collections of TQListViewItems.
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<a href="#details">More...</a>
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4 months ago
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<p><tt>#include <<a href="tqlistview-h.html">tqlistview.h</a>></tt>
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<p><a href="tqlistviewitemiterator-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="#TQListViewItemIterator"><b>TQListViewItemIterator</b></a> ()</li>
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<li class=fn><a href="#TQListViewItemIterator-2"><b>TQListViewItemIterator</b></a> ( TQListViewItem * item )</li>
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<li class=fn><a href="#TQListViewItemIterator-3"><b>TQListViewItemIterator</b></a> ( TQListViewItem * item, int iteratorFlags )</li>
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<li class=fn><a href="#TQListViewItemIterator-4"><b>TQListViewItemIterator</b></a> ( const TQListViewItemIterator & it )</li>
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<li class=fn><a href="#TQListViewItemIterator-5"><b>TQListViewItemIterator</b></a> ( TQListView * lv )</li>
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<li class=fn><a href="#TQListViewItemIterator-6"><b>TQListViewItemIterator</b></a> ( TQListView * lv, int iteratorFlags )</li>
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<li class=fn>TQListViewItemIterator & <a href="#operator-eq"><b>operator=</b></a> ( const TQListViewItemIterator & it )</li>
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<li class=fn><a href="#~TQListViewItemIterator"><b>~TQListViewItemIterator</b></a> ()</li>
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<li class=fn>TQListViewItemIterator & <a href="#operator++"><b>operator++</b></a> ()</li>
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<li class=fn>const TQListViewItemIterator <a href="#operator++-2"><b>operator++</b></a> ( int )</li>
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<li class=fn>TQListViewItemIterator & <a href="#operator+-eq"><b>operator+=</b></a> ( int j )</li>
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<li class=fn>TQListViewItemIterator & <a href="#operator--"><b>operator--</b></a> ()</li>
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<li class=fn>const TQListViewItemIterator <a href="#operator---2"><b>operator--</b></a> ( int )</li>
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<li class=fn>TQListViewItemIterator & <a href="#operator--eq"><b>operator-=</b></a> ( int j )</li>
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<li class=fn>TQListViewItem * <a href="#operator*"><b>operator*</b></a> ()</li>
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<li class=fn>TQListViewItem * <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 TQListViewItemIterator class provides an iterator for collections of TQListViewItems.
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<p>
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<p> Construct an instance of a TQListViewItemIterator, with either a
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<a href="tqlistview.html">TQListView</a>* or a <a href="tqlistviewitem.html">TQListViewItem</a>* as argument, to operate on the tree
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of TQListViewItems, starting from the argument.
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<p> A TQListViewItemIterator 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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TQPtrList:
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<pre>
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<a href="tqptrlist.html">TQPtrList</a><TQListViewItem> lst;
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TQListViewItemIterator 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="tqptrlist.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="tqptrlist.html">TQPtrList</a><TQListViewItem> lst;
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TQListViewItemIterator it( myListView, TQListViewItemIterator::<a href="#IteratorFlag-enum">Selected</a> );
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while ( it.<a href="#current">current</a>() ) {
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lst.<a href="tqptrlist.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 TQListViewItemIterator provides a convenient and easy way to
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traverse a hierarchical <a href="tqlistview.html">TQListView</a>.
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<p> Multiple TQListViewItemIterators can operate on the tree of
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TQListViewItems. A TQListView knows about all iterators operating on
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its TQListViewItems. So when a <a href="tqlistviewitem.html">TQListViewItem</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="tqlistview.html">TQListView</a>, <a href="tqlistviewitem.html">TQListViewItem</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>TQListViewItemIterator::IteratorFlag</h3>
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<p> These flags can be passed to a TQListViewItemIterator 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>TQListViewItemIterator::Visible</tt>
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<li><tt>TQListViewItemIterator::Invisible</tt>
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<li><tt>TQListViewItemIterator::Selected</tt>
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<li><tt>TQListViewItemIterator::Unselected</tt>
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<li><tt>TQListViewItemIterator::Selectable</tt>
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<li><tt>TQListViewItemIterator::NotSelectable</tt>
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<li><tt>TQListViewItemIterator::DragEnabled</tt>
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<li><tt>TQListViewItemIterator::DragDisabled</tt>
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<li><tt>TQListViewItemIterator::DropEnabled</tt>
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<li><tt>TQListViewItemIterator::DropDisabled</tt>
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<li><tt>TQListViewItemIterator::Expandable</tt>
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<li><tt>TQListViewItemIterator::NotExpandable</tt>
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<li><tt>TQListViewItemIterator::Checked</tt>
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<li><tt>TQListViewItemIterator::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="TQListViewItemIterator"></a>TQListViewItemIterator::TQListViewItemIterator ()
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</h3>
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Constructs an empty iterator.
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<h3 class=fn><a name="TQListViewItemIterator-2"></a>TQListViewItemIterator::TQListViewItemIterator ( <a href="tqlistviewitem.html">TQListViewItem</a> * item )
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</h3>
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Constructs an iterator for the <a href="tqlistview.html">TQListView</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="TQListViewItemIterator-3"></a>TQListViewItemIterator::TQListViewItemIterator ( <a href="tqlistviewitem.html">TQListViewItem</a> * item, int iteratorFlags )
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</h3>
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Constructs an iterator for the <a href="tqlistview.html">TQListView</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">TQListViewItemIterator::IteratorFlag</a>.
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<h3 class=fn><a name="TQListViewItemIterator-4"></a>TQListViewItemIterator::TQListViewItemIterator ( const <a href="tqlistviewitemiterator.html">TQListViewItemIterator</a> & it )
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</h3>
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Constructs an iterator for the same <a href="tqlistview.html">TQListView</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="TQListViewItemIterator-5"></a>TQListViewItemIterator::TQListViewItemIterator ( <a href="tqlistview.html">TQListView</a> * lv )
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</h3>
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Constructs an iterator for the <a href="tqlistview.html">TQListView</a> <em>lv</em>. The current
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iterator item is set to point on the first child (<a href="tqlistviewitem.html">TQListViewItem</a>)
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of <em>lv</em>.
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<h3 class=fn><a name="TQListViewItemIterator-6"></a>TQListViewItemIterator::TQListViewItemIterator ( <a href="tqlistview.html">TQListView</a> * lv, int iteratorFlags )
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</h3>
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Constructs an iterator for the <a href="tqlistview.html">TQListView</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="tqlistviewitem.html">TQListViewItem</a>) of <em>lv</em> that matches the flags.
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<p> <p>See also <a href="#IteratorFlag-enum">TQListViewItemIterator::IteratorFlag</a>.
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<h3 class=fn><a name="~TQListViewItemIterator"></a>TQListViewItemIterator::~TQListViewItemIterator ()
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</h3>
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Destroys the iterator.
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<h3 class=fn><a href="tqlistviewitem.html">TQListViewItem</a> * <a name="current"></a>TQListViewItemIterator::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="tqlistviewitem.html">TQListViewItem</a> * <a name="operator*"></a>TQListViewItemIterator::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="tqlistviewitemiterator.html">TQListViewItemIterator</a> & <a name="operator++"></a>TQListViewItemIterator::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="tqlistview.html">TQListView</a> is 0.
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<h3 class=fn>const <a href="tqlistviewitemiterator.html">TQListViewItemIterator</a> <a name="operator++-2"></a>TQListViewItemIterator::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="tqlistviewitemiterator.html">TQListViewItemIterator</a> & <a name="operator+-eq"></a>TQListViewItemIterator::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="tqlistviewitemiterator.html">TQListViewItemIterator</a> & <a name="operator--"></a>TQListViewItemIterator::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="tqlistview.html">TQListView</a> is 0.
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<h3 class=fn>const <a href="tqlistviewitemiterator.html">TQListViewItemIterator</a> <a name="operator---2"></a>TQListViewItemIterator::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="tqlistviewitemiterator.html">TQListViewItemIterator</a> & <a name="operator--eq"></a>TQListViewItemIterator::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="tqlistviewitemiterator.html">TQListViewItemIterator</a> & <a name="operator-eq"></a>TQListViewItemIterator::operator= ( const <a href="tqlistviewitemiterator.html">TQListViewItemIterator</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">TQt 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>TQt 3.3.8</div>
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</table></div></address></body>
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</html>
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