QListViewItemIterator Class Reference
The QListViewItemIterator class provides an iterator for collections of QListViewItems.
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#include <qlistview.h>
List of all member functions.
Public Members
QListViewItemIterator &
operator= ( const QListViewItemIterator & it )
Detailed Description
The QListViewItemIterator class provides an iterator for collections of QListViewItems.
Construct an instance of a QListViewItemIterator, with either a
QListView* or a QListViewItem* as argument, to operate on the tree
of QListViewItems.
A QListViewItemIterator iterates over all items of a list view. This
means that it always makes the first child of the current item the new
current item. If there is no child, the next sibling becomes the new
current item; and if there is no next sibling, the next sibling of
the parent becomes current.
The following example function gets a list of all the items that
have been selected by the user, storing pointers to the items in a
QPtrList:
QPtrList<QListViewItem> lst;
QListViewItemIterator it( lv );
while ( it.current() != 0 ) {
if ( it.current()->isSelected() )
lst.append( it.current() );
++it;
}
A QListViewItemIterator provides a convenient and easy way to
traverse a hierarchical QListView.
Multiple QListViewItemIterators can operate on the tree of
QListViewItems. A QListView knows about all iterators operating on
its QListViewItems. So when a QListViewItem gets removed all
iterators that point to this item are updated and point to the
following item if possible, otherwise to a valid item before the
current one or to 0.
See also QListView, QListViewItem and Advanced Widgets.
Member Function Documentation
QListViewItemIterator::QListViewItemIterator ()
Constructs an empty iterator.
QListViewItemIterator::QListViewItemIterator ( QListViewItem * item )
Constructs an iterator for the QListView of the item. The
current iterator item is set to point to the item.
QListViewItemIterator::QListViewItemIterator ( const QListViewItemIterator & it )
Constructs an iterator for the same QListView as it. The
current iterator item is set to point on the current item of it.
QListViewItemIterator::QListViewItemIterator ( QListView * lv )
Constructs an iterator for the QListView lv. The current
iterator item is set to point on the first child (QListViewItem)
of lv.
QListViewItemIterator::~QListViewItemIterator ()
Destroys the iterator.
QListViewItem * QListViewItemIterator::current () const
Returns a pointer to the current item of the iterator.
Examples: addressbook/centralwidget.cpp, checklists/checklists.cpp, dirview/dirview.cpp and network/ftpclient/ftpview.cpp.
Prefix ++ makes the next item in the QListViewItem tree of the
QListView of the iterator the current item and returns it. If the
current item was the last item in the QListView or null, null is
returned.
const QListViewItemIterator QListViewItemIterator::operator++ ( int )
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Postfix ++ makes the next item in the QListViewItem tree of the
QListView of the iterator the current item and returns the item
which was previously current.
QListViewItemIterator & QListViewItemIterator::operator+= ( int j )
Sets the current item to the item j positions after the current
item in the QListViewItem hierarchy. If this item is beyond the last
item, the current item is set to null.
The new current item (or null, if the new current item is null) is returned.
Prefix -- makes the previous item in the QListViewItem tree of the
QListView of the iterator the current item and returns it. If the
current item was the last first in the QListView or null, null is
returned.
const QListViewItemIterator QListViewItemIterator::operator-- ( int )
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Postfix -- makes the previous item in the QListViewItem tree of
the QListView of the iterator the current item and returns the item.
QListViewItemIterator & QListViewItemIterator::operator-= ( int j )
Sets the current item to the item j positions before the
current item in the QListViewItem hierarchy. If this item is before
the first item, the current item is set to null. The new current
item (or null, if the new current item is null) is returned.
Assignment. Makes a copy of it and returns a reference to its
iterator.
This file is part of the Qt toolkit.
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