How to set font size of text label and hint ?

[vpaul9678]

`library dropdown_formfield;

import 'package:flutter/material.dart';

class DropDownFormField extends FormField {
final String titleText;
final String hintText;
final bool required;
final String errorText;
final dynamic value;
final List dataSource;
final String textField;
final String valueField;
final Function onChanged;
final bool filled;
final EdgeInsets contentPadding;

DropDownFormField(
{FormFieldSetter onSaved,
FormFieldValidator validator,
bool autovalidate = false,
this.titleText = 'Title',
this.hintText = 'Select one option',
this.required = false,
this.errorText = 'Please select one option',
this.value,
this.dataSource,
this.textField,
this.valueField,
this.onChanged,
this.filled = true,
this.contentPadding = const EdgeInsets.fromLTRB(12, 12, 8, 0)})
: super(
onSaved: onSaved,
validator: validator,
autovalidate: autovalidate,
initialValue: value == '' ? null : value,
builder: (FormFieldState state) {
return Container(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
InputDecorator(

                decoration: InputDecoration(
                  contentPadding: contentPadding,
                  labelText: titleText,
                  filled: filled,
                ),
                child: DropdownButtonHideUnderline(
                  child: DropdownButton<dynamic>(
                    isExpanded: true,
                    hint: Text(
                      hintText,
                      style: TextStyle(color: Colors.grey.shade500),
                    ),
                    value: value == '' ? null : value,
                    onChanged: (dynamic newValue) {
                      state.didChange(newValue);
                      onChanged(newValue);
                    },
                    items: dataSource.map((item) {
                      return DropdownMenuItem<dynamic>(
                        value: item[valueField],
                        child: Text(item[textField],
                            overflow: TextOverflow.ellipsis),
                      );
                    }).toList(),
                  ),
                ),
              ),
              SizedBox(height: state.hasError ? 5.0 : 0.0),
              Text(
                state.hasError ? state.errorText : '',
                style: TextStyle(
                    color: Colors.redAccent.shade700,
                    fontSize: state.hasError ? 12.0 : 0.0),
              ),
            ],
          ),
        );
      },
    );

}
`