Re: Using a TreeStore with a ComboBox

[Jef Driesen <jefdriesen hotmail com>]

Milosz Derezynski wrote:
> On 6/23/07, Jonathon Jongsma <jonathon jongsma gmail com> wrote:
> > So you want to display all nodes, but only allow the user to select
> > some of them?  I'm not sure how to accomplish this with a combobox.
> > Andrew's original suggestion would have worked with a TreeView, but I
> > don't know of anything similar for a combobox...
>
> Well there isn't, except for what we originally proposed just on the
> combobox model: use a  TreeModelFilter, which filters out all rows not meant
> to be selected... guess that's the best it can get..

I'll try to explain again what I'm trying to do. I made a screenshot [1] 
to illustrate the problem this time.

As you can see in the screenshot, there is a toplevel node "Noordzee" 
(Northsea) which contains some child nodes. The child nodes are real 
places (names of wrecks in this case) and the toplevel nodes are used to 
group related places together. But those toplevel nodes are not 
necessary real places. This is very similar to the concept of files and 
folders, where you can organize files into an arbitrary hierarchy of 
folders, but a folder is not a file.

In the dropdown menu of the combobox, each submenu contains not only the 
list of child nodes, but also the parent node (along with a separator). 
But since they are there only for grouping, it doesn't make sense to be 
able to select them. So I would like to remove them from the submenu 
only (along with the separator). If I remove them from the model, also 
the child nodes are gone and that's not what I want.

[1] http://users.telenet.be/sacn/tmp/combobox.png