customContainer property

(Container Function(bool showError, Widget childWidget)?) customContainer
final

For example,

RangeInput(
  ...
  id="range-input",
  customContainer: (showError, childWidget) {
    return Container(
      padding: const EdgeInsets.all(8.0),
      height: 50,
      decoration: BoxDecoration(
        border: Border.all(
          color: showError ? Colors.red : Colors.grey,
          width: 1.5,
        ),
        borderRadius: BorderRadius.circular(3),
      ),
      child: childWidget,
     );
    },

Implementation

final Container Function(bool showError, Widget childWidget)? customContainer;