onDismiss property Null safety
The handler for SemanticsAction.dismiss.
This is a request to dismiss the currently focused node.
TalkBack users on Android can trigger this action in the local context menu, and VoiceOver users on iOS can trigger this action with a standard gesture or menu option.
Implementation
VoidCallback? get onDismiss => _onDismiss;
Implementation
set onDismiss(VoidCallback? handler) {
if (_onDismiss == handler)
return;
final bool hadValue = _onDismiss != null;
_onDismiss = handler;
if ((handler != null) != hadValue)
markNeedsSemanticsUpdate();
}