THeader constructor
      const
      THeader({ 
    
- Key? key,
 - required double thPaddingLeft,
 - required double thPaddingTop,
 - required double thPaddingBottom,
 - required double thPaddingRight,
 - required List? headers,
 - required TextAlign? thAlignment,
 - required TextStyle? thStyle,
 - required FontWeight thWeight,
 - required double thSize,
 - required double? widthRatio,
 - required int index,
 
Builds elements for the table headers
Implementation
const THeader(
    {Key? key,
    required this.thPaddingLeft,
    required this.thPaddingTop,
    required this.thPaddingBottom,
    required this.thPaddingRight,
    required List? headers,
    required this.thAlignment,
    required this.thStyle,
    required FontWeight thWeight,
    required double thSize,
    required double? widthRatio,
    required int index})
    : _headers = headers,
      _thWeight = thWeight,
      _thSize = thSize,
      _index = index,
      _widthRatio = widthRatio,
      super(key: key);