onSemanticsUpdate property
final
The onSemanticsUpdate callback is expected to dispatch SemanticsUpdates to the FlutterView that is associated with this PipelineOwner and/or SemanticsOwner.
A SemanticsOwner calls onSemanticsUpdate during sendSemanticsUpdate after the SemanticsUpdate has been build, but before the SemanticsOwner's listeners have been notified.
Implementation
final SemanticsUpdateCallback onSemanticsUpdate;