gtk-gesture, gtk-event-controller, g-object, common-lisp:standard-object, common-lisp:t

None

gtk-gesture-zoom is a gtk-gesture implementation able to recognize pinch/zoom gestures, whenever the distance between both tracked sequences changes, the "scale-changed" signal is emitted to report the scale factor.

The "scale-changed" signal

  lambda (gesture scale)    :run-first    

The signal is emitted whenever the distance between both tracked sequences changes.

gesture

The gtk-gesture-zoom object on which the signal is emitted.

scale

A double float with the scale delta, taking the initial state as 1:1.