header property Null safety
final
The table card's optional header.
This is typically a Text widget, but can also be a Row of TextButtons. To show icon buttons at the top end side of the table with a header, set the actions property.
If items in the table are selectable, then, when the selection is not empty, the header is replaced by a count of the selected items. The actions are still visible when items are selected.
Implementation
final Widget? header;