Can update a conversation

lib/ui/routes/conversation_route.dart

@@ -1,5 +1,6 @@
 import 'package:comunic/helpers/conversations_helper.dart';
 import 'package:comunic/models/conversation.dart';
+import 'package:comunic/ui/routes/update_conversation_route.dart';
 import 'package:comunic/ui/screens/conversation_screen.dart';
 import 'package:comunic/utils/intl_utils.dart';
 import 'package:comunic/utils/ui_utils.dart';
@@ -53,6 +54,14 @@ class _ConversationRouteState extends State<ConversationRoute> {
     });
   }
 
+  void _openSettings() {
+    Navigator.of(context).push(MaterialPageRoute(builder: (b) {
+      return UpdateConversationRoute(
+        conversationID: widget.conversationID,
+      );
+    }));
+  }
+
   Widget _buildRouteBody() {
     //Handle errors
     if (_error != null && _error)
@@ -86,6 +95,12 @@ class _ConversationRouteState extends State<ConversationRoute> {
         title: Text(
           _conversationName == null ? tr("Loading") : _conversationName,
         ),
+        actions: <Widget>[
+          IconButton(
+            icon: Icon(Icons.settings),
+            onPressed: _openSettings,
+          )
+        ],
       ),
       body: _buildRouteBody(),
     );

lib/ui/routes/update_conversation_route.dart

@@ -0,0 +1,91 @@
+import 'package:comunic/helpers/conversations_helper.dart';
+import 'package:comunic/helpers/users_helper.dart';
+import 'package:comunic/lists/users_list.dart';
+import 'package:comunic/models/conversation.dart';
+import 'package:comunic/ui/screens/update_conversation_screen.dart';
+import 'package:comunic/utils/intl_utils.dart';
+import 'package:comunic/utils/ui_utils.dart';
+import 'package:flutter/material.dart';
+
+/// Update a conversation route
+///
+/// @author Pierre HUBERT
+
+class UpdateConversationRoute extends StatefulWidget {
+  final int conversationID;
+
+  const UpdateConversationRoute({Key key, this.conversationID})
+      : assert(conversationID != null),
+        super(key: key);
+
+  @override
+  State<StatefulWidget> createState() => _UpdateConversationRoute();
+}
+
+class _UpdateConversationRoute extends State<UpdateConversationRoute> {
+  Conversation _conversation;
+  UsersList _membersInfo;
+  bool _error = false;
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    _loadConversation();
+  }
+
+  void setError(bool e) => setState(() {
+        _error = e;
+      });
+
+  /// Load information about the being updated conversation
+  Future<void> _loadConversation() async {
+    setError(false);
+
+    final conversation = await ConversationsHelper()
+        .getSingle(widget.conversationID, force: true);
+
+    if (conversation == null) return setError(true);
+
+    //Load information about the members of the conversation
+    _membersInfo = await UsersHelper().getUsersInfo(conversation.members);
+
+    if (_membersInfo == null) return setError(true);
+
+    setState(() {
+      _conversation = conversation;
+    });
+  }
+
+  /// Build the body of this widget
+  Widget _buildBody() {
+    if (_error)
+      return buildErrorCard(
+          tr("Could not load information about the conversation"),
+          actions: [
+            FlatButton(
+              onPressed: _loadConversation,
+              child: Text(
+                tr("Retry").toUpperCase(),
+                style: TextStyle(color: Colors.white),
+              ),
+            )
+          ]);
+
+    if (_conversation == null) return buildLoadingPage();
+
+    return UpdateConversationScreen(
+      initialUsers: _membersInfo,
+      initialSettings: _conversation,
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(tr("Update a conversation")),
+      ),
+      body: _buildBody(),
+    );
+  }
+}