Абстрактный метод createPeriodicTimer
Реализация
Timer createPeriodicTimer(Zone zone, Duration period, void f(Timer timer));
© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.19.6/dart-async/ZoneDelegate/createPeriodicTimer.html
