onSemanticsAction property Null safety
A callback that is invoked whenever the user requests an action to be performed.
Accessing this value returns the value contained in the
PlatformDispatcher singleton, so instead of getting it from here, you
should consider getting it from WidgetsBinding.instance.platformDispatcher instead
(or, when WidgetsBinding isn't available, from
PlatformDispatcher.instance). The reason this value forwards to the
PlatformDispatcher is to provide convenience for applications that only
use a single main window.
This callback is used when the user expresses the action they wish to perform based on the semantics supplied by updateSemantics.
The framework invokes this callback in the same zone in which the callback was set.
Implementation
SemanticsActionCallback? get onSemanticsAction => platformDispatcher.onSemanticsAction;Implementation
set onSemanticsAction(SemanticsActionCallback? callback) {
platformDispatcher.onSemanticsAction = callback;
}