build method

@override Widget build(BuildContext context)

Override this method to build widgets that depend on the state of the listenable (e.g., the current value of the animation).

Implementation

@override
Widget build(BuildContext context) {
  return <Widget>[
    Positioned(
      left: factor,
      top: factor,
      child: Container(
        width: firstSlideTween.value,
        height: (underlineHeight ?? s2) - factor,
        decoration: BoxDecoration(
          borderRadius: BorderRadius.circular(s10),
          color: firstSlideColor ?? kBlack,
        ),
      ),
    ),
    Positioned(
      top: 0,
      child: Container(
        width: secondSlideTween.value,
        height: underlineHeight ?? s3,
        decoration: BoxDecoration(
          borderRadius: BorderRadius.circular(s10),
          color: secondSlideColor ?? kWhite,
        ),
      ),
    )
  ].addStack().addSizedBox(
    width: targetWidth,
    height: underlineHeight ?? s2,
  );
}