Sets the #GtkTreeCellDataFunc to use for the column. This
function is used instead of the standard attributes mapping for
setting the column value, and should set the value of @tree_column's
cell renderer as appropriate. @func may be %NULL to remove an
older one.
Sets the #GtkTreeCellDataFunc to use for the column. This function is used instead of the standard attributes mapping for setting the column value, and should set the value of @tree_column's cell renderer as appropriate. @func may be %NULL to remove an older one.