mirrored_repositories/multiselect_dropdown
import 'package:flutter/material.dart';
import 'package:flutter_multiselect/flutter_multiselect.dart';
import 'MultiSelectFile.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primaryColor: Colors.black,
        scaffoldBackgroundColor: Colors.blueGrey,
      ).copyWith(),
      home: HomePage(),
    );
  }
}

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  final GlobalKey<FormState> _formKey = new GlobalKey<FormState>();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.yellow,
        centerTitle: true,
        title: Text('Flutter Demo - MultiSelect',
            style: TextStyle(color: Colors.black)),
      ),
      body: Center(
        child: new Form(
          key: _formKey,
          // autovalidate: true,
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Padding(
                padding: EdgeInsets.all(10.0),
                child: RaisedButton(
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(20.0),
                  ),
                  elevation: 5.0,
                  child: Text('Click to Select Values in other way',
                      style: TextStyle(fontSize: 18.0, color: Colors.black)),
                  onPressed: () {
                    Navigator.of(context).push(
                      MaterialPageRoute(
                        builder: (context) => MultiSelectPage(),
                      ),
                    );
                  },
                ),
              ),
              SizedBox(height: 20.0),
              Padding(
                padding: const EdgeInsets.all(10.0),
                child: new MultiSelect(
                  textField: 'name',
                  valueField: 'code',
                  filterable: true,
                  required: true,
                  onSaved: (value) {
                    print('The value is $value');
                  },
                  enabledBorderColor: Colors.yellow,
                  selectIcon: Icons.arrow_drop_down_circle,
                  checkBoxColor: Colors.white,
                  saveButtonColor: Colors.amberAccent,
                  saveButtonTextColor: Colors.black,
                  clearButtonColor: Colors.amberAccent,
                  clearButtonIcon: Icons.clear_all,
                  clearButtonTextColor: Colors.black,
                  cancelButtonColor: Colors.amberAccent,
                  cancelButtonTextColor: Colors.black,
                  buttonBarColor: Colors.black,
                  selectedOptionsBoxColor: Colors.white60,
                  autovalidate: true,
                  initialValue: ['IN', 'US'],
                  titleText: 'Country',
                  maxLength: 7, // optional
                  validator: (dynamic value) {
                    if (value == null) {
                      return 'Please select one or more option(s)';
                    }
                    return null;
                  },
                  errorText: 'Please select one or more option(s)',
                  dataSource: [
                    {"name": "Afghanistan", "code": "AF"},
                    {"name": "Åland Islands", "code": "AX"},
                    {"name": "Albania", "code": "AL"},
                    {"name": "Algeria", "code": "DZ"},
                    {"name": "American Samoa", "code": "AS"},
                    {"name": "AndorrA", "code": "AD"},
                    {"name": "Angola", "code": "AO"},
                    {"name": "Anguilla", "code": "AI"},
                    {"name": "Antarctica", "code": "AQ"},
                    {"name": "Antigua and Barbuda", "code": "AG"},
                    {"name": "Argentina", "code": "AR"},
                    {"name": "Armenia", "code": "AM"},
                    {"name": "Aruba", "code": "AW"},
                    {"name": "Australia", "code": "AU"},
                    {"name": "Austria", "code": "AT"},
                    {"name": "Azerbaijan", "code": "AZ"},
                    {"name": "Bahamas", "code": "BS"},
                    {"name": "Bahrain", "code": "BH"},
                    {"name": "Bangladesh", "code": "BD"},
                    {"name": "Barbados", "code": "BB"},
                    {"name": "Belarus", "code": "BY"},
                    {"name": "Belgium", "code": "BE"},
                    {"name": "Belize", "code": "BZ"},
                    {"name": "Benin", "code": "BJ"},
                    {"name": "Bermuda", "code": "BM"},
                    {"name": "Bhutan", "code": "BT"},
                    {"name": "Bolivia", "code": "BO"},
                    {"name": "Bosnia and Herzegovina", "code": "BA"},
                    {"name": "Botswana", "code": "BW"},
                    {"name": "Bouvet Island", "code": "BV"},
                    {"name": "Brazil", "code": "BR"},
                    {"name": "British Indian Ocean Territory", "code": "IO"},
                    {"name": "Brunei Darussalam", "code": "BN"},
                    {"name": "Bulgaria", "code": "BG"},
                    {"name": "Burkina Faso", "code": "BF"},
                    {"name": "Burundi", "code": "BI"},
                    {"name": "Cambodia", "code": "KH"},
                    {"name": "Cameroon", "code": "CM"},
                    {"name": "Canada", "code": "CA"},
                    {"name": "Cape Verde", "code": "CV"},
                    {"name": "Cayman Islands", "code": "KY"},
                    {"name": "Central African Republic", "code": "CF"},
                    {"name": "Chad", "code": "TD"},
                    {"name": "Chile", "code": "CL"},
                    {"name": "China", "code": "CN"},
                    {"name": "Christmas Island", "code": "CX"},
                    {"name": "Cocos (Keeling) Islands", "code": "CC"},
                    {"name": "Colombia", "code": "CO"},
                    {"name": "Comoros", "code": "KM"},
                    {"name": "Congo", "code": "CG"},
                    {
                      "name": "Congo, The Democratic Republic of the",
                      "code": "CD"
                    },
                    {"name": "Cook Islands", "code": "CK"},
                    {"name": "Costa Rica", "code": "CR"},
                    {"name": "Cote D\'Ivoire", "code": "CI"},
                    {"name": "Croatia", "code": "HR"},
                    {"name": "Cuba", "code": "CU"},
                    {"name": "Cyprus", "code": "CY"},
                    {"name": "Czech Republic", "code": "CZ"},
                    {"name": "Denmark", "code": "DK"},
                    {"name": "Djibouti", "code": "DJ"},
                    {"name": "Dominica", "code": "DM"},
                    {"name": "Dominican Republic", "code": "DO"},
                    {"name": "Ecuador", "code": "EC"},
                    {"name": "Egypt", "code": "EG"},
                    {"name": "El Salvador", "code": "SV"},
                    {"name": "Equatorial Guinea", "code": "GQ"},
                    {"name": "Eritrea", "code": "ER"},
                    {"name": "Estonia", "code": "EE"},
                    {"name": "Ethiopia", "code": "ET"},
                    {"name": "Falkland Islands (Malvinas)", "code": "FK"},
                    {"name": "Faroe Islands", "code": "FO"},
                    {"name": "Fiji", "code": "FJ"},
                    {"name": "Finland", "code": "FI"},
                    {"name": "France", "code": "FR"},
                    {"name": "French Guiana", "code": "GF"},
                    {"name": "French Polynesia", "code": "PF"},
                    {"name": "French Southern Territories", "code": "TF"},
                    {"name": "Gabon", "code": "GA"},
                    {"name": "Gambia", "code": "GM"},
                    {"name": "Georgia", "code": "GE"},
                    {"name": "Germany", "code": "DE"},
                    {"name": "Ghana", "code": "GH"},
                    {"name": "Gibraltar", "code": "GI"},
                    {"name": "Greece", "code": "GR"},
                    {"name": "Greenland", "code": "GL"},
                    {"name": "Grenada", "code": "GD"},
                    {"name": "Guadeloupe", "code": "GP"},
                    {"name": "Guam", "code": "GU"},
                    {"name": "Guatemala", "code": "GT"},
                    {"name": "Guernsey", "code": "GG"},
                    {"name": "Guinea", "code": "GN"},
                    {"name": "Guinea-Bissau", "code": "GW"},
                    {"name": "Guyana", "code": "GY"},
                    {"name": "Haiti", "code": "HT"},
                    {"name": "Heard Island and Mcdonald Islands", "code": "HM"},
                    {"name": "Holy See (Vatican City State)", "code": "VA"},
                    {"name": "Honduras", "code": "HN"},
                    {"name": "Hong Kong", "code": "HK"},
                    {"name": "Hungary", "code": "HU"},
                    {"name": "Iceland", "code": "IS"},
                    {"name": "India", "code": "IN"},
                    {"name": "Indonesia", "code": "ID"},
                    {"name": "Iran, Islamic Republic Of", "code": "IR"},
                    {"name": "Iraq", "code": "IQ"},
                    {"name": "Ireland", "code": "IE"},
                    {"name": "Isle of Man", "code": "IM"},
                    {"name": "Israel", "code": "IL"},
                    {"name": "Italy", "code": "IT"},
                    {"name": "Jamaica", "code": "JM"},
                    {"name": "Japan", "code": "JP"},
                    {"name": "Jersey", "code": "JE"},
                    {"name": "Jordan", "code": "JO"},
                    {"name": "Kazakhstan", "code": "KZ"},
                    {"name": "Kenya", "code": "KE"},
                    {"name": "Kiribati", "code": "KI"},
                    {
                      "name": "Korea, Democratic People\'s Republic of",
                      "code": "KP"
                    },
                    {"name": "Korea, Republic of", "code": "KR"},
                    {"name": "Kuwait", "code": "KW"},
                    {"name": "Kyrgyzstan", "code": "KG"},
                    {"name": "Lao People\'s Democratic Republic", "code": "LA"},
                    {"name": "Latvia", "code": "LV"},
                    {"name": "Lebanon", "code": "LB"},
                    {"name": "Lesotho", "code": "LS"},
                    {"name": "Liberia", "code": "LR"},
                    {"name": "Libyan Arab Jamahiriya", "code": "LY"},
                    {"name": "Liechtenstein", "code": "LI"},
                    {"name": "Lithuania", "code": "LT"},
                    {"name": "Luxembourg", "code": "LU"},
                    {"name": "Macao", "code": "MO"},
                    {
                      "name": "Macedonia, The Former Yugoslav Republic of",
                      "code": "MK"
                    },
                    {"name": "Madagascar", "code": "MG"},
                    {"name": "Malawi", "code": "MW"},
                    {"name": "Malaysia", "code": "MY"},
                    {"name": "Maldives", "code": "MV"},
                    {"name": "Mali", "code": "ML"},
                    {"name": "Malta", "code": "MT"},
                    {"name": "Marshall Islands", "code": "MH"},
                    {"name": "Martinique", "code": "MQ"},
                    {"name": "Mauritania", "code": "MR"},
                    {"name": "Mauritius", "code": "MU"},
                    {"name": "Mayotte", "code": "YT"},
                    {"name": "Mexico", "code": "MX"},
                    {"name": "Micronesia, Federated States of", "code": "FM"},
                    {"name": "Moldova, Republic of", "code": "MD"},
                    {"name": "Monaco", "code": "MC"},
                    {"name": "Mongolia", "code": "MN"},
                    {"name": "Montserrat", "code": "MS"},
                    {"name": "Morocco", "code": "MA"},
                    {"name": "Mozambique", "code": "MZ"},
                    {"name": "Myanmar", "code": "MM"},
                    {"name": "Namibia", "code": "NA"},
                    {"name": "Nauru", "code": "NR"},
                    {"name": "Nepal", "code": "NP"},
                    {"name": "Netherlands", "code": "NL"},
                    {"name": "Netherlands Antilles", "code": "AN"},
                    {"name": "New Caledonia", "code": "NC"},
                    {"name": "New Zealand", "code": "NZ"},
                    {"name": "Nicaragua", "code": "NI"},
                    {"name": "Niger", "code": "NE"},
                    {"name": "Nigeria", "code": "NG"},
                    {"name": "Niue", "code": "NU"},
                    {"name": "Norfolk Island", "code": "NF"},
                    {"name": "Northern Mariana Islands", "code": "MP"},
                    {"name": "Norway", "code": "NO"},
                    {"name": "Oman", "code": "OM"},
                    {"name": "Pakistan", "code": "PK"},
                    {"name": "Palau", "code": "PW"},
                    {"name": "Palestinian Territory, Occupied", "code": "PS"},
                    {"name": "Panama", "code": "PA"},
                    {"name": "Papua New Guinea", "code": "PG"},
                    {"name": "Paraguay", "code": "PY"},
                    {"name": "Peru", "code": "PE"},
                    {"name": "Philippines", "code": "PH"},
                    {"name": "Pitcairn", "code": "PN"},
                    {"name": "Poland", "code": "PL"},
                    {"name": "Portugal", "code": "PT"},
                    {"name": "Puerto Rico", "code": "PR"},
                    {"name": "Qatar", "code": "QA"},
                    {"name": "Reunion", "code": "RE"},
                    {"name": "Romania", "code": "RO"},
                    {"name": "Russian Federation", "code": "RU"},
                    {"name": "RWANDA", "code": "RW"},
                    {"name": "Saint Helena", "code": "SH"},
                    {"name": "Saint Kitts and Nevis", "code": "KN"},
                    {"name": "Saint Lucia", "code": "LC"},
                    {"name": "Saint Pierre and Miquelon", "code": "PM"},
                    {"name": "Saint Vincent and the Grenadines", "code": "VC"},
                    {"name": "Samoa", "code": "WS"},
                    {"name": "San Marino", "code": "SM"},
                    {"name": "Sao Tome and Principe", "code": "ST"},
                    {"name": "Saudi Arabia", "code": "SA"},
                    {"name": "Senegal", "code": "SN"},
                    {"name": "Serbia and Montenegro", "code": "CS"},
                    {"name": "Seychelles", "code": "SC"},
                    {"name": "Sierra Leone", "code": "SL"},
                    {"name": "Singapore", "code": "SG"},
                    {"name": "Slovakia", "code": "SK"},
                    {"name": "Slovenia", "code": "SI"},
                    {"name": "Solomon Islands", "code": "SB"},
                    {"name": "Somalia", "code": "SO"},
                    {"name": "South Africa", "code": "ZA"},
                    {
                      "name": "South Georgia and the South Sandwich Islands",
                      "code": "GS"
                    },
                    {"name": "Spain", "code": "ES"},
                    {"name": "Sri Lanka", "code": "LK"},
                    {"name": "Sudan", "code": "SD"},
                    {"name": "Suriname", "code": "SR"},
                    {"name": "Svalbard and Jan Mayen", "code": "SJ"},
                    {"name": "Swaziland", "code": "SZ"},
                    {"name": "Sweden", "code": "SE"},
                    {"name": "Switzerland", "code": "CH"},
                    {"name": "Syrian Arab Republic", "code": "SY"},
                    {"name": "Taiwan, Province of China", "code": "TW"},
                    {"name": "Tajikistan", "code": "TJ"},
                    {"name": "Tanzania, United Republic of", "code": "TZ"},
                    {"name": "Thailand", "code": "TH"},
                    {"name": "Timor-Leste", "code": "TL"},
                    {"name": "Togo", "code": "TG"},
                    {"name": "Tokelau", "code": "TK"},
                    {"name": "Tonga", "code": "TO"},
                    {"name": "Trinidad and Tobago", "code": "TT"},
                    {"name": "Tunisia", "code": "TN"},
                    {"name": "Turkey", "code": "TR"},
                    {"name": "Turkmenistan", "code": "TM"},
                    {"name": "Turks and Caicos Islands", "code": "TC"},
                    {"name": "Tuvalu", "code": "TV"},
                    {"name": "Uganda", "code": "UG"},
                    {"name": "Ukraine", "code": "UA"},
                    {"name": "United Arab Emirates", "code": "AE"},
                    {"name": "United Kingdom", "code": "GB"},
                    {"name": "United States", "code": "US"},
                    {
                      "name": "United States Minor Outlying Islands",
                      "code": "UM"
                    },
                    {"name": "Uruguay", "code": "UY"},
                    {"name": "Uzbekistan", "code": "UZ"},
                    {"name": "Vanuatu", "code": "VU"},
                    {"name": "Venezuela", "code": "VE"},
                    {"name": "Viet Nam", "code": "VN"},
                    {"name": "Virgin Islands, British", "code": "VG"},
                    {"name": "Virgin Islands, U.S.", "code": "VI"},
                    {"name": "Wallis and Futuna", "code": "WF"},
                    {"name": "Western Sahara", "code": "EH"},
                    {"name": "Yemen", "code": "YE"},
                    {"name": "Zambia", "code": "ZM"},
                    {"name": "Zimbabwe", "code": "ZW"}
                  ],
                ),
              ),
              SizedBox(height: 20.0),
              RaisedButton(
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(20.0),
                ),
                elevation: 5.0,
                child: Text('Save', style: TextStyle(fontSize: 18.0)),
                textColor: Colors.black,
                // color: Theme.of(context).primaryColor,
                color: Colors.yellow,
                onPressed: () {
                  _onFormSaved();
                },
              )
            ],
          ),
        ),
      ),
      // This trailing comma makes auto-formatting nicer for build methods.
    );
  }

  void _onFormSaved() {
    final FormState form = _formKey.currentState;
    form.save();
  }
}
