(define-gboxed-variant-cstruct event "GdkEvent"
  (type event-type)
  (window (g:object window))
  (send-event (:boolean :int8))
  (:variant type
            ...
            ;; GdkEventTouchpadPinch
            ((:touchpad-pinch) event-touchpad-pinch
             (phase :int8)
             (n-fingers :int8)
             (time :uint32)
             (x :double)
             (y :double)
             (dx :double)
             (dy :double)
             (angle-delta :double)
             (scale :double)
             (x-root :double)
             (y-root :double)
             (state modifier-type))
  ... ))  

type

The gdk:event-type of the event, the :touchpad-pinch value.

window

The gdk:window object which received the event.

send-event

True if the event was sent explicitly.

phase

The current phase of the gesture.

n-fingers

The number of fingers triggering the swipe.

time

The unsigned integer with the time of the event in milliseconds.

x

The double float x coordinate of the pointer.

y

The double float y coordinate of the pointer.

dx

The double float movement delta in the x axis of the swipe focal point.

dy

The double float movement delta in the y axis of the swipe focal point.

angle-delta

The double float with the angle change in radians, negative angles denote counter-clockwise movements.

scale

The double float with the current scale, relative to that at the time of the corresponding :begin value of the gdk:touchpad-gesture-phase enumeration.

x-root

The double float x coordinate of the pointer, relative to the root of the screen.

y-root

The double float y coordinate of the pointer, relative to the root of the screen.

state

The gdk:modifier-type bit-mask representing the state of the modifier keys, for example, the Control, Shift and Alt keys, and the pointer buttons.