Постоянная wheelEvent
Реализация
static const EventStreamProvider<WheelEvent> wheelEvent =
const EventStreamProvider<WheelEvent>('wheel');
© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-svg/SvgElement/wheelEvent-constant.html
