SliverAnimatedListState constructor Null safety

1. Flutter
2. widgets
3. SliverAnimatedListState
4. SliverAnimatedListState constructor

SliverAnimatedListState class

1. Constructors
2. SliverAnimatedListState
3. Properties
4. context
5. hashCode
6. mounted
7. runtimeType
8. widget
9. Methods
10. activate
11. build
12. createTicker
13. deactivate
14. debugFillProperties
15. didChangeDependencies
16. didUpdateWidget
17. dispose
18. initState
19. insertItem
20. noSuchMethod
21. reassemble
22. removeItem
23. setState
24. toDiagnosticsNode
25. toString
26. toStringShort
27. Operators
28. operator ==