TableSpanBuilder typedef
Signature for a function that creates a TableSpan for a given index of row or column in a TableView.
Used by the TableCellDelegateMixin.buildColumn and TableCellDelegateMixin.buildRow to configure rows and columns in the TableView.
Returning null from this builder signifies the end of rows or columns being built if a row or column count has not been specified for the table.
Implementation
typedef TableSpanBuilder = TableSpan? Function(int index);