[PyQt] Populate Model data in a separate thread

[Detlev Offenbach]

On Dienstag, 28. April 2009, Darryl Wallace wrote:
> Hello Detlev,
>
> Where abouts in eric4 do you do perform this "lazy" population?  

UI/BrowserModel.py and Project/ProjectBrowserModel.py

> This 
> interests me as I suffer from a similar table population slowdown.
>
> Thanks,
> Darryl
>
> Detlev Offenbach wrote:
> > Another solution would be to do lazy population of the model. That is, if
> > child items are to be shown, fetch them at that time. This avoids
> > populating the model in advance and is more responsive. See eric4 as an
> > example.
> >
> > Detlev
> >
> > On Montag, 27. April 2009, Demetrius Cassidy wrote:
> >> How many items do you need to populate in your model class? Unless you
> >> are populating a view with thousands of items, I do not suggest threads
> >> at all since they can be dangerous if you do not know how to use them.
> >>
> >> If you absolutely needed to do this, my approach would be to have some
> >> sort of method I could call on my dialog to fetch items in a separate
> >> thread in the model, and once I have my data I could populate myself and
> >> call the appropriate begin/end methods on my QAbstractItemModel class.
> >>
> >> If I knew what you were trying to accomplish, then maybe I could give
> >> you some better guidance.
> >>
> >> Edwin Marshall-2 wrote:
> >>> I've been reading on qtcentre that it is possible to populate a model
> >>> from a separate qthread in order to prevent a program from freezing
> >>> before it loads, however the example code I have seen is a bit too much
> >>> involved (and in c++) for me to comprehend. I was wondering if anyone
> >>> knew of a pyqt program that did, or could point me toward some code
> >>> snippets doing this. The only thing that I can gather is that I need to
> >>> create the qthread in the __init__ method of my model and call it's run
> >>> command. However, I can't figure out what exactly need to go in the run
> >>> method, or what signals to emit/catch. Thansk in advance for any help
> >>>
> >>>
> >>>
> >>>
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-- 
Detlev Offenbach
detlev at die-offenbachs.de