[Qt-interest] QAggregatingProxyModel ?

[Stephen Kelly]

Kishore wrote:

> On Wednesday 23 Jun 2010 9:00:02 pm Stephen Kelly wrote:
>> Kishore wrote:
>> > Once the dev days presentations mentions a QAggregatingProxyModel class
>> > that could be part of standard Qt (4.5 release as i recall). Surely, it
>> > was not included in the release. Sadly, the only reference to the class
>> > name returned by google is from that presentation
>> > (http://www.slideshare.net/mariusbu/practical-model-view-programming)
>> > 
>> > I am now in need of such a class. What are my options?
>> 
>> Option 1) Ask Qt to release it somewhere. They might put it on labs if
>> you reach the right people.
> 
> Who would be the right one? Hmmm i guess there might be the email id the
> presentation i linked. I'll check.
> 
>> Option 2) If LGPL works for you you can use the one that I designed but
>> haven't fully written yet in kdelibs.
> 
> That works fine for me! I'll look. Whats the file called?

I haven't checked it or written it yet. Need to do some other refactoring 
first so that it shares code with KAbstractProxyModel (also not checked in 
yet). It will probably be a few weeks before that happens.

> 
>> Option 3) Write your own. A potentially non-trivial amount of work and
>> learning if you haven't implemented a proxy model before. Don't subclass
>> QAbstractProxyModel by the way. Subclass QAbstractItemModel instead.
> 
> Thats the first thing that struck me when i looked through the API of
> QAbstractItemModel. API seems to assume that there is only one model that
> it proxies. API like setSourceModel() and sourceModel().

Indeed.

All the best,

Steve.