MultiSelectableSelectionContainerDelegate constructor Null safety

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

MultiSelectableSelectionContainerDelegate class

1. Constructors
2. MultiSelectableSelectionContainerDelegate
3. Properties
4. compareOrder
5. containerSize
6. currentSelectionEndIndex
7. currentSelectionStartIndex
8. hashCode
9. hasListeners
10. runtimeType
11. selectables
12. value
13. Methods
14. add
15. addListener
16. didChangeSelectables
17. dispatchSelectionEvent
18. dispatchSelectionEventToChild
19. dispose
20. ensureChildUpdated
21. getSelectedContent
22. getSelectionGeometry
23. getTransformFrom
24. getTransformTo
25. handleClearSelection
26. handleSelectAll
27. handleSelectionEdgeUpdate
28. handleSelectWord
29. layoutDidChange
30. noSuchMethod
31. notifyListeners
32. pushHandleLayers
33. remove
34. removeListener
35. toString
36. Operators
37. operator ==