mobile-app/lib/presentation/screens/profile/sc_change_password.dart

import 'package:farm_tpf/custom_model/password.dart';
import 'package:farm_tpf/data/repository/user_repository.dart';
import 'package:farm_tpf/presentation/custom_widgets/widget_loading.dart';
import 'package:farm_tpf/presentation/custom_widgets/widget_toast.dart';
import 'package:farm_tpf/utils/const_color.dart';
import 'package:farm_tpf/utils/validators.dart';
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:keyboard_dismisser/keyboard_dismisser.dart';

class ChangePasswordScreen extends StatefulWidget {
  @override
  _ChangePasswordScreenState createState() => _ChangePasswordScreenState();
}

class _ChangePasswordScreenState extends State<ChangePasswordScreen> {
  final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();
  final _repository = UserRepository();
  GlobalKey<FormState> _formKey = GlobalKey();
  bool _autoValidate = false;
  FlutterToast flutterToast;

  Password _password = Password();
  TextEditingController _currentPasswordController = TextEditingController();
  TextEditingController _newPasswordController = TextEditingController();
  TextEditingController _confirmPasswordController = TextEditingController();

  @override
  void initState() {
    super.initState();
    flutterToast = FlutterToast(context);
  }

  _validateInputs() async {
    if (_formKey.currentState.validate()) {
      _formKey.currentState.save();
      LoadingDialog.showLoadingDialog(context);
      _repository.changePassword(_password).then((value) {
        LoadingDialog.hideLoadingDialog(context);
        flutterToast.showToast(
            child: WidgetToast(message: "Cập nhật thành công"));
        Navigator.pop(context);
      }).catchError((onError) {
        _scaffoldKey.currentState.showSnackBar(SnackBar(
          content: Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: <Widget>[
              Text('Cập nhật không thành công.'),
              Icon(Icons.error),
            ],
          ),
          backgroundColor: Colors.red,
          duration: Duration(seconds: 3),
        ));
        LoadingDialog.hideLoadingDialog(context);
      });
    } else {
      _autoValidate = true;
    }
  }

  Widget _currentPasswordField() {
    return TextFormField(
      keyboardType: TextInputType.text,
      obscureText: true,
      decoration: InputDecoration(labelText: "Mật khẩu hiện tại"),
      controller: _currentPasswordController,
      validator: (String value) {
        return Validators.validateNotNullOrEmpty(value, "Mật khẩu hiện tại");
      },
      onSaved: (newValue) {
        _password.currentPassword = newValue;
      },
    );
  }

  Widget _newPasswordField() {
    return TextFormField(
      keyboardType: TextInputType.text,
      obscureText: true,
      decoration: InputDecoration(labelText: "Mật khẩu mới"),
      controller: _newPasswordController,
      validator: validators.validateNewPassword,
      onSaved: (newValue) {
        _password.newPassword = newValue;
      },
    );
  }

  Widget _confirmPasswordField() {
    return TextFormField(
      keyboardType: TextInputType.text,
      obscureText: true,
      decoration: InputDecoration(labelText: "Nhập lại mật khẩu mới"),
      controller: _confirmPasswordController,
      validator: (String value) {
        return validators.validateConfirmPassword(
            _newPasswordController.text, value);
      },
      onSaved: (newValue) {},
    );
  }

  Widget _btnSubmit() {
    return SizedBox(
      width: double.infinity,
      height: 55,
      child: FlatButton(
        onPressed: () {
          FocusScopeNode currentFocus = FocusScope.of(context);
          if (!currentFocus.hasPrimaryFocus) {
            currentFocus.unfocus();
          }
          _validateInputs();
        },
        color: COLOR_CONST.DEFAULT,
        shape: RoundedRectangleBorder(
          borderRadius: new BorderRadius.circular(7.0),
        ),
        child: Text(
          'Cập nhật'.toUpperCase(),
          style:
              TextStyle(fontWeight: FontWeight.bold, color: COLOR_CONST.WHITE),
        ),
      ),
    );
  }

  @override
  Widget build(BuildContext context) => KeyboardDismisser(
      child: Scaffold(
          key: _scaffoldKey,
          appBar: AppBar(centerTitle: true, title: Text("Cập nhật mật khẩu")),
          body: KeyboardDismisser(
              child: Form(
                  key: _formKey,
                  autovalidate: _autoValidate,
                  child: SingleChildScrollView(
                    padding: EdgeInsets.all(8.0),
                    child: Column(
                      children: <Widget>[
                        _currentPasswordField(),
                        SizedBox(
                          height: 8.0,
                        ),
                        _newPasswordField(),
                        SizedBox(
                          height: 8.0,
                        ),
                        _confirmPasswordField(),
                        SizedBox(
                          height: 8.0,
                        ),
                        _btnSubmit()
                      ],
                    ),
                  )))));
}