signal callback delegate or function to connect
void callback(gtk.widget.Widget widget, gtk.window.Window window)
widget the newly focused widget (or null for no focus) (optional)
window the instance the signal is connected to (optional)
Yes.After to execute callback after default handler, No.After to execute before (default)
Signal ID
Connect to SetFocus signal.
This signal is emitted whenever the currently focused widget in this window changes.