public interface IChildIndexProviderPublic Interface IChildIndexProvidertype IChildIndexProvider = interface end| GetChildIndex(ILogical) | Gets child's actual index in order of the original source. |
| TryGetTotalCount(Int32) | Total children count or null if source is infinite. Some Avalonia features might not work if TryGetTotalCount(Int32) returns false, for instance: nth-last-child selector. |
| ChildIndexChanged | Notifies subscriber when a child's index was changed. |