signal callback delegate or function to connect
void callback(double x, double y, gtk.gesture_stylus.GestureStylus gestureStylus)
x the X coordinate of the stylus event (optional)
y the Y coordinate of the stylus event (optional)
gestureStylus 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 Down signal.
Emitted when the stylus touches the device.