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