way to detect when the cursor is at the first/last position in an entry ?

[Nicolas Jäger <jagernicolas legtux org>]

Hi,
I have several entries arranged one beside the other. I would like to
move the cursor between them. For example when I reach the first
position in the n-th entry I want to move the cursor to (n-1)-th entry
at his last position.

I'm looking for a signal wich can be emitted when I move the cursor.
I didn't found anything like this so far. The only signal wich may
helps for doing that is `Gtk::Widget::signal_key_press_event()`

there is any signal like the one I'm looking for ? or should I go with
`Gtk::Widget::signal_key_press_event()` ?

regards,
Nicolas J.