This should be called by the this’s owning layout widget when focus is to be passed to
this, or moved within this for a given direction
and row
data.
Implementing `GtkCellArea` classes should implement this method to receive and navigate focus in its own way particular to how it lays out cells.
this |
a `GtkCellArea` |
direction |
the `GtkDirectionType` |
true if focus remains inside this as a result of this call. |