Implement new thread creation

lib/create_thread_screen.dart

@@ -0,0 +1,112 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'package:wind/thread_list_model.dart';
+import 'package:wind/thread_model.dart';
+
+class CreateThreadScreen extends StatefulWidget {
+  @override
+  State<StatefulWidget> createState() => _CreateThreadScreenState();
+}
+
+class _CreateThreadScreenState extends State<CreateThreadScreen> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+        appBar: AppBar(title: Text("Создать новый тред")),
+        body: Center(
+            child: Container(
+          width: 640,
+          child: Consumer<ThreadModel>(
+            builder: (context, value, child) => CreateThreadForm(model: value),
+          ),
+        )));
+  }
+}
+
+class CreateThreadForm extends StatefulWidget {
+  CreateThreadForm({Key? key, required this.model}) : super(key: key);
+
+  ThreadModel model;
+
+  @override
+  CreateThreadFormState createState() {
+    return CreateThreadFormState(model);
+  }
+}
+
+// Define a corresponding State class.
+// This class holds data related to the form.
+class CreateThreadFormState extends State<CreateThreadForm> {
+  CreateThreadFormState(this.model);
+
+  ThreadModel model;
+  final _formKey = GlobalKey<FormState>();
+
+  String _subject = "";
+  String _text = "";
+
+  @override
+  Widget build(BuildContext context) {
+    return Form(
+      key: _formKey,
+      child: Column(
+        children: <Widget>[
+          Padding(
+            padding: const EdgeInsets.symmetric(vertical: 16),
+            child: TextFormField(
+                onSaved: ((newValue) {
+                  _subject = newValue!;
+                }),
+                decoration: InputDecoration(
+                    border: OutlineInputBorder(), labelText: "Название поста"),
+                validator: (value) {
+                  if (value == null || value.isEmpty) {
+                    return 'Пожалуйста, введите название';
+                  }
+                  return null;
+                }),
+          ),
+          Padding(
+              padding: const EdgeInsets.only(bottom: 16),
+              child: TextFormField(
+                onSaved: (newValue) {
+                  _text = newValue!;
+                },
+                minLines: 5,
+                keyboardType: TextInputType.multiline,
+                maxLines: 35,
+                decoration: InputDecoration(
+                    border: OutlineInputBorder(), labelText: "Текст поста"),
+                validator: (value) {
+                  if (value == null || value.isEmpty) {
+                    return 'Пожалуйста, введите текст';
+                  }
+                  return null;
+                },
+              )),
+          ElevatedButton(
+              onPressed: () {
+                if (_formKey.currentState!.validate()) {
+                  _formKey.currentState!.save();
+                  model.createThread(_subject, _text).then((value) {
+                    ScaffoldMessenger.of(context).showSnackBar(
+                      const SnackBar(content: Text('Тред создан!')),
+                    );
+                    Provider.of<ThreadListModel>(context, listen: false)
+                        .update();
+                    Navigator.pop(context);
+                  }, onError: (error) {
+                    ScaffoldMessenger.of(context).showSnackBar(
+                      SnackBar(
+                          content: Text(
+                              'При создании треда произошла ошибка: ${error.toString()}')),
+                    );
+                  });
+                }
+              },
+              child: Text("Создать"))
+        ],
+      ),
+    );
+  }
+}

lib/main.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
+import 'package:wind/create_thread_screen.dart';
 import 'package:wind/newsgroup_list_view.dart';
 import 'package:wind/nntp_client.dart';
 import 'package:wind/thread_list_view.dart';
@@ -47,6 +48,9 @@ class MyApp extends StatelessWidget {
                   threadNumber:
                       int.parse(uriData.queryParametersAll['num']!.first));
               break;
+            case '/thread/create':
+              pageView = CreateThreadScreen();
+              break;
             default:
               pageView = MyHomePage(title: 'Wind');
               break;
@@ -82,31 +86,35 @@ class _MyHomePageState extends State<MyHomePage> {
 
   @override
   Widget build(BuildContext context) {
-    // This method is rerun every time setState is called, for instance as done
+    return Consumer<ThreadListModel>(
-    // by the _incrementCounter method above.
+      builder: (context, value, child) => Scaffold(
-    //
-    // The Flutter framework has been optimized to make rerunning build methods
-    // fast, so that you can just rebuild anything that needs updating rather
-    // than having to individually change instances of widgets.
-    return Scaffold(
           appBar: AppBar(
-          // Here we take the value from the MyHomePage object that was created by
-          // the App.build method, and use it to set our appbar title.
             title: Text(widget.title),
-          actions: [
+            actions: value.currentGroup != ""
+                ? [
+                    TextButton.icon(
+                      onPressed: () =>
+                          Navigator.pushNamed(context, "/thread/create"),
+                      icon: Icon(Icons.add),
+                      label: Text("Создать тред"),
+                      style: TextButton.styleFrom(
+                          primary: Theme.of(context).colorScheme.onPrimary),
+                    ),
                     TextButton.icon(
                         onPressed: () {
                           ScaffoldMessenger.of(context).showSnackBar(
                             const SnackBar(
                                 content: Text('Обновление списка тредов...')),
                           );
-                  Provider.of<ThreadListModel>(context, listen: false).update();
+                          Provider.of<ThreadListModel>(context, listen: false)
+                              .update();
                         },
                         label: const Text("Обновить"),
                         style: TextButton.styleFrom(
                             primary: Theme.of(context).colorScheme.onPrimary),
                         icon: Icon(Icons.sync))
-          ],
+                  ]
+                : [],
           ),
           body: Center(
             child: Container(
@@ -140,6 +148,7 @@ class _MyHomePageState extends State<MyHomePage> {
                 ],
               ),
             ),
-        ));
+          )),
+    );
   }
 }

lib/message_item_view.dart

@@ -18,7 +18,7 @@ class MessageItemView extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Container(
-        margin: this.isOpPost
+        padding: this.isOpPost
             ? EdgeInsets.only(bottom: 10, left: 10, right: 10, top: 16)
             : isLast
                 ? EdgeInsets.only(left: 10, right: 10, bottom: 16)

lib/thread_list_model.dart

@@ -40,7 +40,7 @@ class ThreadListModel extends ChangeNotifier {
         _curItems.add(ThreadItem(
             msg.getHeaderValue("Message-Id")!,
             number,
-            msg.getHeaderValue("Subject")!,
+            msg.decodeSubject()!,
             msg.getHeaderValue("From")!,
             msg.getHeaderValue("Date")!,
             msg.decodeTextPlainPart()!));

lib/thread_model.dart

@@ -13,7 +13,7 @@ class ThreadModel extends ChangeNotifier {
     var mi = MessageItem(
         msg.getHeaderValue("Message-Id")!,
         number,
-        msg.getHeaderValue("Subject")!,
+        msg.decodeSubject()!,
         msg.getHeaderValue("From")!,
         msg.getHeaderValue("Date")!,
         msg.decodeTextPlainPart()!);
@@ -37,7 +37,7 @@ class ThreadModel extends ChangeNotifier {
           null,
           message.getHeaderValue("From")!,
           message.getHeaderValue("Date")!,
-          message.decodeTextPlainPart()!));
+          message.decodeTextPlainPart()!.trim()));
     });
 
     return items;
@@ -45,7 +45,7 @@ class ThreadModel extends ChangeNotifier {
 
   Future<int> postMessage(MimeMessage opPost, String text) async {
     var msg = MessageBuilder.buildSimpleTextMessage(
-        MailAddress.empty(), [], text,
+        MailAddress.empty(), [], text.trim(),
         subject: "Re: " + opPost.decodeSubject()!);
     msg.setHeader("From", "anonymous");
     msg.addHeader("In-Reply-To", opPost.getHeaderValue("Message-Id"));
@@ -54,6 +54,15 @@ class ThreadModel extends ChangeNotifier {
     return await client!.postArticle(msg);
   }
 
+  Future<int> createThread(String subject, String text) async {
+    var msg = MessageBuilder.buildSimpleTextMessage(
+        MailAddress.empty(), [], text.trim(),
+        subject: subject);
+    msg.setHeader("From", "anonymous");
+    msg.addHeader("Newsgroups", client!.currentGroup!);
+    return await client!.postArticle(msg);
+  }
+
   void update() {
     notifyListeners();
   }