Re: Cell rendering issue

[Colomban Wendling <lists ban herbesfolles org>]

Hi,

Le 20/06/2011 19:45, Thomas Bollmeier a écrit :
> 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?

The simpler solution I can think of is to set the visibility of the cell
renderer in the cell_data_func(), depending on whether the row should
display it or not.

So, for your toplevel rows keyword would be set to be visible and all
three other to be hidden, and the inverse for children rows.

That's the only other solution I know of apart writing your own "proxy"
cell renderer (note that for example gconf-editor does so, so if your
application has a compatible license you could borrow its code as a
basis). Of course perhaps there's other ways I don't know of, I'm not a
GTK god ^^

Regards,
Colomban