signal callback delegate or function to connect
void callback(double dx, double dy, gtk.event_controller_scroll.EventControllerScroll eventControllerScroll)
dx X delta (optional)
dy Y delta (optional)
eventControllerScroll 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 Scroll signal.
Signals that the widget should scroll by the amount specified by dx and dy.