MaterialStateProperty<T> constructor Null safety

1. Flutter
2. material
3. MaterialStateProperty<T>
4. MaterialStateProperty constructor

MaterialStateProperty class

1. Constructors
2. MaterialStateProperty
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. resolve
9. toString
10. Operators
11. operator ==
12. Static methods
13. all
14. lerp
15. resolveAs
16. resolveWith