[Qt-interest] How to know when scrollbar appears?

[Jiang, Chunyan (GE Healthcare)]

Hi Qt-users,
 
I use QTreeWidget to show something. When there are more items added to
QTreeWidget, the vertical scrollbar will show up. Here I want to do
something when scrollbar appears. How to know when scrollbar shows up?
Is there some event or signals from QScrollbar or QWidget that I can
use?
 
Thanks in advance!
 
Chunyan
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