[Qt-interest] QTreeView and custom QAbstractItemModel performance problem

[Sean Harmer]

On Friday 09 July 2010 10:41:08 Felix Brack wrote: 
> The thing with the row shift was my first guess too, but profiling
> without removing the first (oldest) row has shown that every thing
> behaves identically - poor performance and high CPU load.
> 
> If there is really no solution to this I will give the table view a
> chance. Doing this however would mean to surrender. Furthermore one
> could say that Qt's TreeView is not able to manage a simple (100 to 500
> rows) dynamically changing list with 12 columns; something I simply
> can't believe (I have implemented this with native windows code and it
> works without any problem even with thousands of rows); this is why I'm
> sure that I just don't really understand the mechanics of the Qt
> framework. I'd rather think this problem is of type 'how could I be so
> stupid not to ...' once the solution is found.

Quite. If my previous guess at hasChildren() being wrong is also wrong can you 
post a small compilable example the reproduces the problem and we can try it 
for ourselves?

Cheers,

Sean