get user time and countdown

Author: Luis Correa

lib/components/connected_form.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:progress_dialog/progress_dialog.dart';
 
@@ -16,6 +18,10 @@ class ConnectedForm extends StatefulWidget {
 class _ConnectedFormState extends State<ConnectedForm> {
   NautaClient nautaClient;
   ProgressDialog pr;
+  get time => remaining.toString().split('.')[0];
+
+  Duration remaining;
+  Timer _timer;
 
   @override
   void initState() {
@@ -24,8 +30,50 @@ class _ConnectedFormState extends State<ConnectedForm> {
     setState(() {
       nautaClient = NautaClient(user: widget.username, password: '');
 
-      nautaClient.loadLastSession();
+      nautaClient.loadLastSession().then((value) => {
+            nautaClient.remainingTime().then((value) {
+              final rtime = value.split(':');
+              final hour = rtime[0];
+              final min = rtime[1];
+              final sec = rtime[2];
+              setState(() {
+                remaining = Duration(
+                    hours: int.parse(hour),
+                    minutes: int.parse(min),
+                    seconds: int.parse(sec));
+              });
+            })
+          });
     });
+
+    startTime();
+  }
+
+  void startTime() {
+    const oneSec = const Duration(seconds: 1);
+
+    _timer = new Timer.periodic(
+      oneSec,
+      (Timer timer) => setState(
+        () {
+          if (remaining.inSeconds < 1) {
+            timer.cancel();
+          } else {
+            final newtime = remaining.inSeconds - 1;
+            setState(() {
+              remaining = Duration(seconds: newtime);
+            });
+            print(remaining.toString());
+          }
+        },
+      ),
+    );
+  }
+
+  @override
+  void dispose() {
+    _timer.cancel();
+    super.dispose();
   }
 
   @override
@@ -48,7 +96,7 @@ class _ConnectedFormState extends State<ConnectedForm> {
       child: Column(
         children: <Widget>[
           Padding(
-            padding: EdgeInsets.all(5.0),
+            padding: EdgeInsets.all(4.0),
             child: Text(
               'Conectado',
               style: TextStyle(color: Colors.blue, fontSize: 20),
@@ -64,6 +112,13 @@ class _ConnectedFormState extends State<ConnectedForm> {
               ),
             ),
           ),
+          Padding(
+            padding: EdgeInsets.all(5.0),
+            child: Text(
+              remaining == null ? '00:00:00' : time,
+              style: TextStyle(color: Colors.red, fontSize: 20),
+            ),
+          ),
           Padding(
             padding: EdgeInsets.all(10.0),
             child: MaterialButton(
@@ -80,8 +135,16 @@ class _ConnectedFormState extends State<ConnectedForm> {
                 try {
                   await nautaClient.logout();
 
-                  Navigator.pushReplacement(context,
-                      MaterialPageRoute(builder: (context) => LoginPage()));
+                  this.dispose();
+
+                  Navigator.pushReplacement(
+                    context,
+                    MaterialPageRoute(
+                      builder: (context) => LoginPage(
+                        title: 'NAUTA',
+                      ),
+                    ),
+                  );
                 } on NautaLogoutException catch (e) {
                   await pr.hide();
                   Scaffold.of(context).showSnackBar(SnackBar(