gboolean gdk_events_get_distance ( GdkEvent* event1, GdkEvent* event2, gdouble* distance )
If both events have X/Y information, the distance between both coordinates
(as in a straight line going from
event2) will be returned.
Available since: 3.0
The data is owned by the caller of the method.
Return location for the distance.
The argument will be set by the function.