High-level table widget

Hello,

Is there a widget as high-level as GTree but
for tables instead of lists and trees.
I use GTree for displaying lists of thumbnails,
performing multiple selections, and contextual menus, and
I'd like to display them in a table so as to show
more of them in a given area. If the number of columns
could be automatically adapted to the width of the container,
that would be even better.
In fact, I want something similar to what is found in
file explorers.

It's for my software Camelis (www.irisa.fr/LIS/ferre/camelis/).

Best,
Sébastien Ferré