Re: Using a TreeStore with a ComboBox

[Jef Driesen <jefdriesen hotmail com>]

Jef Driesen wrote:
> 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

In the meantime, I have found an answer for my own question. The 
solution was to pack a Gtk::CellRendererText into the Gtk:ComboBox 
manually and use set_cell_data_func to set the "sensitive" property of 
the renderer to false for nodes with children.