final _loginFormKey = GlobalKey<FormState>();
  final _emailKey = GlobalKey<FormFieldState>();
  final _passwordKey = GlobalKey<FormFieldState>();

.
.
.
  void _validateEmail() {
    if (_emailKey.currentState.validate()) {
      print('valid');
    } else {
      print('invalid');
    }
  }

  void _validatePassword() {
    _passwordKey.currentState.validate();
  }

.
.
.
Widget loginWidget() {
    return Column(
      children: [
        Form(
          key: _loginFormKey,
          child:
          Column(
            children: [
            Padding(
              padding: EdgeInsets.only(bottom: 7),
              child: EltaFormField(
                key: _emailKey,
                placeholderText: 'Ваш email',
                keyboardType: TextInputType.emailAddress,
                type: EltaFormFieldType.normal,
                validator: this.widget.emailValidator.validate,
                onSaved: (String value) {
                  _email = value;
                  },
                onEditingComplete: () {
                  _validateEmail();
                 },
                onTap: () {
                  _pushToTextField();
                  },
                ),
              ),
            EltaFormField(
              key: _passwordKey,
              placeholderText: 'Ваш пароль',
              type: EltaFormFieldType.obscure,
              validator: this.widget.passwordValidator.validate,
              onSaved: (String value) {
                _password = value;
              },
              onEditingComplete: () {
                _validatePassword();
              },
              onTap: () {
                _pushToTextField();
              },
            )
            ],
          ),
        )
      ],
    );
  }