RestorableListenable<T extends Listenable> constructor Null safety

1. Flutter
2. widgets
3. RestorableListenable<T extends Listenable>
4. RestorableListenable constructor

RestorableListenable class

1. Constructors
2. RestorableListenable
3. Properties
4. enabled
5. hashCode
6. hasListeners
7. isRegistered
8. runtimeType
9. state
10. value
11. Methods
12. addListener
13. createDefaultValue
14. dispose
15. fromPrimitives
16. initWithValue
17. noSuchMethod
18. notifyListeners
19. removeListener
20. toPrimitives
21. toString
22. Operators
23. operator ==