Re: Explanation of ListView in virtual mode

From memory, if it helps, I built a virtual listview about ten years ago
with MFC.  It was for a bank to show a view of hundreds of thousands of
rows.

The virtual listview was the only option.  The real issue was the timely
and correct retrieval/caching of the underlying data and keeping that
coordinated with the virtual view. Also giving the user some useful
navigational abilities.

The description you gave of behaviour sounds about right to me, as you are
literally servicing the paint of the item and subitems, icons etc.  The
listview is relying on you to hold the data and will frequently need to
access it.

The amount of activity after your source rowcount exceeds the view rowcount
should not change in the UI element of the overall task.