TdFormCascader<T> constructor

TdFormCascader<T>({ Key? key, FormFieldSetter<T>? onSaved, FormFieldValidator<T>? validator, T? initialValue, required List<TdCascaderItem<T>> options, AutovalidateMode? autovalidateMode, ValueChanged<T?>? onChanged, Widget? label, double? labelWidth, TextAlign? labelAlign, Widget? help, String? hintText, })

Implementation

TdFormCascader({
  super.key,
  super.onSaved,
  super.validator,
  super.initialValue,
  required List<TdCascaderItem<T>> options,
  super.autovalidateMode,
  ValueChanged<T?>? onChanged,
  Widget? label,
  double? labelWidth,
  TextAlign? labelAlign,
  Widget? help,
  String? hintText,
}) : super(
        builder: (field) {
          void handleChanged(T? value) {
            field.didChange(value);

            onChanged?.call(value);
          }

          Widget? errorTextWidget;
          if (field.errorText != null) {
            errorTextWidget = Text(field.errorText!);
          }

          Widget? hintTextWidget;
          if (field.value != null) {
            final List<String> list = [];

            if (_queryStack(options, field.value, list)) {
              hintTextWidget = Text(list.join(' / '));
            }
          } else if (hintText != null) {
            hintTextWidget = Text(hintText);
          }

          final contentWidget = TdFormPickerView(
            onTap: () async {
              final result = await TdCascaderPlugin.open(
                field.value,
                title: label,
                options: options,
              );

              handleChanged(result);
            },
            content: hintTextWidget,
          );

          return TdFormItem(
            label: label,
            labelWidth: labelWidth,
            labelAlign: labelAlign,
            help: help,
            errorMessage: errorTextWidget,
            contentAlign: TdFormItemAlign.end,
            child: contentWidget,
          );
        },
      );