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

None

The gtk:gesture-zoom class is a gtk:gesture implementation for 2-finger 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      

gesture

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

scale

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

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