[Interest] QTreeWidget Auto Scroll

[Tony Rietwyk]

> Sent: Thursday, 15 August 2013 5:00 PM
> 
> Hello all,
> 
> I have three QTreeWidgets in a dialog. They all have an equal number of
> items.
> 
> When the user scrolls one of the QTreeWidgets, I wonder how I can scroll
the
> other 2?
> 
> I have looked through the docs and cannot see any auto scroll feature.
> 
> Thanks,
> Josh.

Hi Josh, 

Basically, you can connect the valueChange signal of one scroll bar to the
setValue of the other two.  But this is usually not enough - people want
changes to any of the 3 scroll bars to be reflected in the other two.  The
hard part is preventing signals from continually firing (signal ping-pong).
This is best done by using an intermediate QObject based controller
connected to all 3 scroll bars.   The tree widgets will also need to be
exactly the same size (as well as number of items) - otherwise you need to
take the different range values into consideration.  

Regards, 

Tony