flutter package drop-down menu

Directly on the code, a simple drop-down menu package

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_app/utils/CXColors.dart';

class DropDownSelect extends StatelessWidget {
  final String label;
  String value;
  final List<DropdownMenuItem> items;
  final ValueChanged onChanged;
  bool isText;

  DropDownSelect({Key key, this.label, this.value, this.items, this.onChanged, this.isText = false});

  @override
  Widget build(BuildContext context) {
    return new Container(
      height: 50.0,
      padding: EdgeInsets.fromLTRB(20.0, 0, 20.0, 0),
      decoration: new BoxDecoration(
        border: Border(
          bottom: BorderSide(color: CXColors.titleColor_cc, width: 0.5),
        ),
      ),
      child: Row(
        children: <Widget>[
          new Expanded(
            flex: 3,
            child: new Container(
              child: new Text(
                this.label,
                style: TextStyle(fontSize: 16.0, color: Colors.black87),
              ),
            ),
          ),
          new Expanded(
            flex: 8,
            child: Container(
              padding: EdgeInsets.only(top: 4.0),
              child: this.isText ? Text(this.value) : DropdownButton(
                icon: Icon(
                  Icons.arrow_downward,
                  color: Colors.black26,
                ),
                style: TextStyle(fontSize: 15.0, color: Colors.black54),
                iconSize: 22.0,
                isExpanded: true,
                underline: new Container(),
                hint: Text('请选择',
                  style: TextStyle(
                      color: Colors.black26
                  ),
                ),
                items: this.items,
                onChanged: onChanged,
                value: this.value,
              ),
            ),
          ),
        ],
      ),
    );
  }
}

Use:

// declare items 
List <DropdownMenuItem> _items = [
     new new DropdownMenuItem (Child: the Text ( ' yes ' ), value: ' a ' ),
     new new DropdownMenuItem (Child: the Text ( ' NO ' ), value: ' No ' ), 
] ; 
// declared value, the default value is 
String _value = ' No ' ;
 // use Widget 
DropDownSelect ( 
  label: ' drop-down menu ' , 
  items: _items, 
  value: _value, 
  isText:false ,　　// display non-editable text, drop-down menus is false, primarily for displaying and editing is to true 
  the onChanged: (T) { 
    the setState (() { 
      the _value = T; 
    }); 
  }, 
),