Re: Hiding individual TreeRows

["Jonathon Jongsma" <jonathon jongsma gmail com>]

On 5/26/06, Matt Bragano <maestro485 comcast net> wrote:
> Hi all,
>
> I've been experimenting with different ways to hide individual TreeRows
> on the fly, but with limited success.  Basically if a row's name begins
> with a " . " then I'd like to hide it, but not necessarily erase it from
> the TreeView using erase() since I'd like to be able to reverse this
> action without recreating the entire view.  I was looking around the
> mailing list archives and I stumbled upon this post:
>
> http://marc.theaimsgroup.com/?l=gtkmm&m=109957757907166&w=2

using the cell_data_func, you'd be able to customize the data that
gets displayed in the particular cell, but I don't think you'd be able
to hide the row entirely.  GTK makes it easy to selectively hide or
display certain columns from your model, but I don't know of any easy
way to show or hide rows from the model.  The only way I can think of
to hide a row entirely would be by creating a custom TreeModel
(something I've been experimenting with lately), but there's not a lot
of documentation about doing that, and it's a bit advanced for
somebody just learning gtkmm.

If you're up for a challenge, you might try looking through the
nautilus source code to see how they do it, since nautilus has an
option for whether to display 'hidden' files.  It's written in GTK+,
but the basic concepts should be the same for gtkmm.  For all I know,
they might just rescan the directory each time the option is changed
(which would be more-or-less equivalent to what you're doing by
erasing the items from the model), but they might have a more clever
way as well.

Perhaps somebody else has a better idea, though...

Jonner