Cell rendering issue

[Thomas Bollmeier <TBollmeier web de>]

Hi GTK-experts,

currently I work on a small location finder application 
(http://www.bolles-werk.org/software-projects/quoloco.html). Basically 
the application shall allow users to search for arbitrary keywords. The 
results are displayed both in a map (a champlain view) and in a tree 
view (GtkTreeView).
For the latter one I have to solve a problem: The tree shall consist of 
"search nodes" on the top level and "location nodes" as their children. 
Both node types have different data associated to them. The search node 
has to display the keywords of the search whereas the location nodes 
shall display a checkbox (to toggle their visibility in the map) as well 
as latitude and longitude. So the tree view has  four columns ("key 
words", "visible", "latitude", "longitude") in total. For search nodes 
the last three columns shall be empty, for location nodes the first column.
Is it somehow possible to implement that? In the documentation I only 
find ways (using the cell data function) to have control over the 
properties of the column's renderers. However I actually would like to 
be able to set the renderer per cell (depending on the node type) 
instead of per column. Of course there would be the alternative to 
implement my own custom renderer - but at the moment I would like to 
avoid this effort. Any ideas?

Regards,
Thomas