[PyKDE] QAbstractItemView Question

[Andreas Pakulat]

On 20.11.06 10:51:05, Matt Chambers wrote:
> Andreas Pakulat wrotee
> >>I can detect if one of these elements is not in the new ElementTree, but, how 
> >>do I get the info needed
> >>to call beginRemoveRows( QModelIndex parent, int row, int col).  I can get 
> >>the row,col no problem,
> >>but how can I get the deleted items parent QModelIndex?
> >>    
> >
> >Well, you have to have some mapping from Element back to a proper index,
> >i.e. you need a way to get the index for an Element in the tree. Then
> >you can call parent() on that index.
> 
> I remember reading something about how the indexes are temporary.  I was under 
> the impression
> that they would go away and be re-created as needed?

Yes and no. Yes the indexes are not meant to be "stored away", but they
are cached by Qt's view classes.

What I meant to say, if you implement a function that removes elements
from your tree and doesn't take a QModelIndex to the parent of these
indexes (like the removeRows() function does) then you need a way to
calculate the index for this parent element. I guess the
element-to-be-removed has a function to retrieve the parent, so you can
calculate the row+col for that element too, if you can do it for the
to-be-removed-element. Then to get the parent index of the parent
element do the same. 

Andreas

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