currentState property
The State for the widget in the tree that currently has this global key.
The current state is null if (1) there is no widget in the tree that
matches this global key, (2) that widget is not a StatefulWidget, or the
associated State object is not a subtype of T
.
Implementation
T? get currentState => switch (_currentElement) {
StatefulElement(:final T state) => state,
_ => null,
};