login_view.dart

import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:timecoder/data/data_access/services/Values.dart';
import 'package:timecoder/i18n/I18n.dart';
import 'package:timecoder/ui/general/TCButton.dart';
import 'package:timecoder/ui/general/TCErrorDialog.dart';
import 'package:timecoder/ui/general/TCProgressIndicator.dart';
import 'package:timecoder/ui/page/login_register/login/LoginPagePresenter.dart';
import 'package:timecoder/ui/page/login_register/login/text_field/LoginTextField.dart';

class LoginPageView extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => new _LoginPageState();
}

class _LoginPageState extends State<LoginPageView>
    implements LoginPageContract {
  LoginPagePresenter _presenter;

  TextEditingController _emailController;
  TextEditingController _passwordController;

  bool _buttonEnabled = false;

  _LoginPageState() {
    _presenter = new LoginPagePresenter(this);
  }

  @override
  void initState() {
    super.initState();

    //Create a change Event for the TextFields
    _emailController = new TextEditingController();
    _emailController.addListener(_onTextChanged);

    _passwordController = new TextEditingController();
    _passwordController.addListener(_onTextChanged);

  }

  @override
  Widget build(BuildContext context) {
    return new ListView(
        children: <Widget>[
      new Padding(padding: const EdgeInsets.all(16.0)),
      new LoginTextField(
        controller: _emailController,
        fieldType: LoginTextFieldType.EMAIL,
        hintText: I18n
            .of(context)
            .email,
      ),
      new LoginTextField(
        controller: _passwordController,
        fieldType: LoginTextFieldType.PASSWORD,
        hintText: I18n
            .of(context)
            .password,
      ),

      new Container(
        padding: const EdgeInsets.all(16.0),
        child: new Center(
          child: new TCButton(
              text: I18n
                  .of(context)
                  .login,
              onTab: () =>
                  _presenter.login(
                      _emailController.text.trim(), _passwordController.text),
              enabled: _buttonEnabled),
        ),
      )
    ]);
  }

  _onTextChanged() {
    _presenter.updateValidation(
        _emailController.text.trim(), _passwordController.text);
  }


  @override
  void dispose() {
    super.dispose();
    _emailController.dispose();
    _passwordController.dispose();
  }

  @override
  void onLoginFailure(errorCode) {
    showDialog(
        context: context,
        child: new ErrorDialog(message: _generateErrorMessage(errorCode)));
  }

  @override
  void onLoginSuccess() {
    Navigator.pushReplacementNamed(context, '/somePage');
  }

  @override
  void onValidationChanged(bool isValid) {
    setState(() {
      _buttonEnabled = isValid;
    });
  }

  @override
  void onStopRequestLoading() {
    Navigator.pop(context);
  }

  @override
  void onStartRequestLoading() {
    showDialog(
        context: context,
        child: new ProgressIndicator());
  }

  String _generateErrorMessage(errorCode) {
    return "shit..";
  }
}