[Qt-interest] QListView: Get indexes of visible items

[Malyushytsky, Alex]

This might be useful for you.

http://www.qtsoftware.com/developer/faqs/faq.2007-02-27.8405373153

Example there is written for TableWidget, but it should be no difference for any QAbstractItemView derived class as QListView is.

Hope this helps,
   Alex



-----Original Message-----
From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Ingomar Wesp
Sent: Monday, April 27, 2009 12:59 PM
To: qt-interest at trolltech.com
Subject: [Qt-interest] QListView: Get indexes of visible items

Hello,

In the process of porting a Java/Swing application to Qt, I stumbled over the
following problem (I'm completely new to Qt, so please be lenient if this is
an easy one):

I need to get the model indices for all items that are currently visible in a
QListView (essentially the inverse of QAbstractItemView::
visualRegionForSelection). I know there's an indexAt function, but I'm not
comfortable with using it with the top left and bottom right viewport
coordinates because of spacing between items.

Although, because this is going to be called quite a lot, it needs to be
reasonably fast and the QListView will have to many items,  iterating over all
of them is definitely not the way to go.

Anyone got any hints for me?

Best regards,
Ingomar Wesp
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