Display basic login form

lib/main.dart

@@ -14,6 +14,7 @@ class ComunicApplication extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
+      debugShowCheckedModeBanner: false,
       // We need to know whether the user is signed in or not to continue
       home: FutureBuilder(
         future: AccountCredentialsHelper().signedIn(),

lib/ui/login_route.dart

@@ -1,3 +1,5 @@
+import 'package:comunic/utils/input_utils.dart';
+import 'package:comunic/utils/intl_utils.dart';
 import 'package:flutter/material.dart';
 
 /// Login route
@@ -10,8 +12,81 @@ class LoginRoute extends StatefulWidget {
 }
 
 class _LoginRouteState extends State<LoginRoute> {
+  String _currEmail;
+  String _currPassword;
+
+  @override
+  void initState() {
+    super.initState();
+    _currEmail = "";
+    _currPassword = "";
+  }
+
+  void _emailChanged(String newEmail) {
+    setState(() {
+      _currEmail = newEmail;
+    });
+  }
+
+  void _passwordChanged(String newValue) {
+    setState(() {
+      _currPassword = newValue;
+    });
+  }
+
+  /// Call this whenever the user request to perform login
+  void _submitForm() {
+
+  }
+
+  /// Build login form
+  Widget _buildLoginForm(){
+    return SingleChildScrollView(
+      child: Padding(
+        padding: const EdgeInsets.all(8.0),
+        child: Column(
+          children: <Widget>[
+            Text(tr("Please sign into your Comunic account: ")),
+            //Email address
+            TextField(
+              keyboardType: TextInputType.emailAddress,
+              decoration: InputDecoration(
+                  labelText: tr("Email address"),
+                  alignLabelWithHint: true,
+                  errorText:
+                  _currEmail.length > 0 && !validateEmail(_currEmail)
+                      ? tr("Invalid email address!")
+                      : null),
+              onChanged: _emailChanged,
+            ),
+
+            //Password
+            TextField(
+              obscureText: true,
+              decoration: InputDecoration(
+                labelText: tr("Password"),
+                alignLabelWithHint: true,
+              ),
+              onChanged: _passwordChanged,
+            ),
+
+            RaisedButton(
+              child: Text(tr("Sign in")),
+              onPressed: !validateEmail(_currEmail) || _currPassword.length < 3 ? null : _submitForm,
+            )
+          ],
+        ),
+      ),
+    );
+  }
+
   @override
   Widget build(BuildContext context) {
-    return Text("Hello world");
+    return Scaffold(
+      appBar: AppBar(
+        title: Text("Comunic"),
+      ),
+      body: _buildLoginForm()
+    );
   }
-}
+}

lib/utils/input_utils.dart

@@ -0,0 +1,13 @@
+/// Input utilities
+///
+/// @author Pierre HUBERT
+
+/// Check out whether a given email address is valid or not
+///
+/// Taken from https://medium.com/@nitishk72/form-validation-in-flutter-d762fbc9212c
+bool validateEmail(String value) {
+  Pattern pattern =
+      r'^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$';
+  RegExp regex = new RegExp(pattern);
+  return regex.hasMatch(value);
+}

lib/utils/intl_utils.dart

@@ -0,0 +1,11 @@
+/// Internationalization utilities
+///
+/// @author Pierre HUBERT
+
+/// Translate a string
+///
+/// Translate a given [string] into the current language, if available
+String tr(String string) {
+  //TODO : create translation system
+  return string;
+}