dropdownIcon property

(Widget Function(bool showError)?) dropdownIcon
final

For example,

RangeInput(
  ...
  id="range-input",
  closeIcon: (showError) {
    return Icon(
      Icons.arrow_drop_down,
      color: showError ? Colors.red : Colors.black,
    );
   },

Implementation

final Widget Function(bool showError)? dropdownIcon;