onSemanticsEnabledChanged property

VoidCallback onSemanticsEnabledChanged

A callback that is invoked when the value of semanticsEnabled changes.

The framework invokes this callback in the same zone in which the callback was set.

Implementation 

VoidCallback get onSemanticsEnabledChanged => _onSemanticsEnabledChanged;
void onSemanticsEnabledChanged= (VoidCallback callback)

Implementation 

set onSemanticsEnabledChanged(VoidCallback callback) {
  _onSemanticsEnabledChanged = callback;
  _onSemanticsEnabledChangedZone = Zone.current;
}