Константа dragStartEvent
Реализация
static const EventStreamProvider<MouseEvent> dragStartEvent =
const EventStreamProvider<MouseEvent>('dragstart');
© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.19.6/dart-svg/SvgElement/dragStartEvent-constant.html
