label_build.dart

@override
Widget build(BuildContext context) {
 return Container(
   height: _labelHeight,
   decoration: BoxDecoration(
       border: Border.all(
           color: this.strokeColor ?? Colors.transparent,
           width: strokeWidth),
       borderRadius: BorderRadius.circular(_cornerSize),
       color: this.backgroundColor ?? Colors.transparent),
   padding: EdgeInsets.symmetric(horizontal: 8),
   child: Center(
     child: Text(this.labelText,
         style: Theme.of(context)
             .textTheme
             .caption
             ?.copyWith(color: this.textColor ?? Colors.black)),
   ),
 );
}