findRootAncestorStateOfType<T extends State<StatefulWidget> > method
Null safety
override
Returns the State object of the furthest ancestor StatefulWidget widget
that is an instance of the given type T.
Functions the same way as findAncestorStateOfType but keeps visiting subsequent
ancestors until there are none of the type instance of T remaining.
Then returns the last one found.
This operation is O(N) as well though N is the entire widget tree rather than a subtree.
Implementation
@override
T? findRootAncestorStateOfType<T extends State<StatefulWidget>>() {
assert(_debugCheckStateIsActiveForAncestorLookup());
Element? ancestor = _parent;
StatefulElement? statefulAncestor;
while (ancestor != null) {
if (ancestor is StatefulElement && ancestor.state is T) {
statefulAncestor = ancestor;
}
ancestor = ancestor._parent;
}
return statefulAncestor?.state as T?;
}