root method

Implementation

@override
Widget root(
  BuildContext context,
  ToolbarViewController controller,
  Widget parent,
) {
  if (controller.isElevated) {
    return Column(
      children: [
        parent,
        Container(
          width: double.infinity,
          height: controller.elevation,
          color: controller.elevationColor,
        )
      ],
    );
  } else {
    return parent;
  }
}