onTapCancel property Null safety

1. flutter_json_widgets
2. widget
3. InkWell
4. onTapCancel property

InkWell class

1. Constructors
2. InkWell
3. fromJson
4. Properties
5. autofocus
6. borderRadius
7. canRequestFocus
8. child
9. copyWith
10. customBorder
11. enableFeedback
12. excludeFromSemantics
13. focusColor
14. hashCode
15. highlightColor
16. hoverColor
17. key
18. mouseCursor
19. onDoubleTap
20. onFocusChange
21. onHighlightChanged
22. onHover
23. onLongPress
24. onTap
25. onTapCancel
26. overlayColor
27. radius
28. runtimeType
29. splashColor
30. Methods
31. map
32. mapOrNull
33. maybeMap
34. maybeWhen
35. noSuchMethod
36. toJson
37. toString
38. when
39. whenOrNull
40. Operators
41. operator ==