ScrollActivityDelegate constructor Null safety

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

ScrollActivityDelegate class

1. Constructors
2. ScrollActivityDelegate
3. Properties
4. axisDirection
5. hashCode
6. runtimeType
7. Methods
8. applyUserOffset
9. goBallistic
10. goIdle
11. noSuchMethod
12. setPixels
13. toString
14. Operators
15. operator ==