[gtkmm] iterating over visible treerows

[klaus triendl <triendl kj aon at>]

hi all,

is there a possibility to iterate just over the visible treerows?
i have to display the time passed in seconds since the beginning of an
event, so i need to update this column every second.
or how expensive is it to update all rows in the treemodel every second?

--
klaus triendl