[PyQt] Segfault when activating items in a view, more info

Andreas Pakulat apaku at gmx.de
Mon Aug 9 13:57:29 BST 2010

On 09.08.10 13:31:15, Hans-Peter Jansen wrote:
> On Monday 09 August 2010, 12:20:36 Andreas Pakulat wrote:
> > If you use this model on a treeview you'll probably end up in an infinite
> > tree size. The reason is that you're returning a child-count of 2 for
> > each and every index (and the treeview is going to ask for the row-count
> > of each toplevel entry). Try to add a check for index.isValid() and only
> > return 2 if its not a valid index.
> Yes, that did the trick. As Peter said, this is rather counterintuitive as 
> an table API, but anyway. For any descendants:

See my answer to peter, there's no such thing as a 'table API' in Qt's
itemviews. There's only a generic model API and thats what all views from
Qt itself rely upon.

> BTW, this model reveals another issue: the focus can be set to all table 
> items by clicking with the mouse, but only to the left column items by 
> keyboard. Is that to be expected? Given, above is enough to implement a 
> read only table, shouldn't it handle keyboard navigation properly, too? 

Do you mean the focus rectangle (on linux this is a small dotted line
around the current item) or the normal selection? Both things are not
dependent upon the actual model, only the view.


You had some happiness once, but your parents moved away, and you had to
leave it behind.

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