[Qt-interest] QSortFilterProxyModel disable sorting

[Andras Toth]

On Friday 15 October 2010 07:52:59 am Andre Somers wrote:
>   Op 14-10-2010 22:11, Andras Toth schreef:
> > Hello, is there any way to disable sorting in QSortFilterProxyModel? (in
> > order to use it just for filtering, but not sorting). According to the
> > documentation there is a setSortingEnabled method for the view classes,
> > but not for the models.
> 

Hello,

Thanks to everybody for the suggestions, the empty sort method is a right 
solution. However I must admit, I wrongly thought that sorting happens by 
default* on QSortFilterProxyModel (like filtering). Now, after some 
experimenting, I found out that it does not happen unless you explicitly call 
the sort() method.

Regards,

András

* Until now I did not really care about the values themselves, I was just 
doing some benchmarking (I had only implemented filtering) and I found that 
the update time of the filter was increasing exponentially in relation to the 
count of items. I thought this was due to the supposed automatic sorting, 
since filtering should increase only linearly, that's why I wanted to disable 
it.
I found, however, that the bottleneck was in the implementation of data() and 
setData() methods of my model, so sorting (which does not happen at all) is 
not culpable.