gboolean focus ( GtkCellArea* area, GtkDirectionType direction )
This should be called by the
area’s owning layout widget
when focus is to be passed to
area, or moved within
for a given
direction and row data.
GtkCellArea classes should implement this
method to receive and navigate focus in its own way particular
to how it lays out cells.
Deprecated since: 4.10
Please do not use it in newly written code.