Fix unread conversations drop down

lib/lists/unread_conversations_list.dart

@@ -8,7 +8,7 @@ import 'package:comunic/models/unread_conversation.dart';
 class UnreadConversationsList extends AbstractList<UnreadConversation> {
   /// Get the ID of the users included in this list
   Set<int> get usersID {
-    final set = Set();
+    final set = Set<int>();
     forEach((element) => set.addAll(element.message.usersID));
     return set;
   }

lib/models/conversation_message.dart

@@ -224,7 +224,8 @@ class ConversationMessage extends SerializableElement<ConversationMessage> {
   Set<int> get usersID {
     if (userID != null) return Set()..add(userID);
 
-    return serverMessage.usersID;
+    if (serverMessage != null) return serverMessage.usersID;
+    return Set();
   }
 
   @override

lib/ui/screens/unread_conversations_screen.dart

@@ -3,8 +3,11 @@ import 'package:comunic/helpers/events_helper.dart';
 import 'package:comunic/helpers/users_helper.dart';
 import 'package:comunic/lists/unread_conversations_list.dart';
 import 'package:comunic/lists/users_list.dart';
+import 'package:comunic/ui/routes/main_route/main_route.dart';
 import 'package:comunic/ui/widgets/async_screen_widget.dart';
+import 'package:comunic/ui/widgets/conversation_image_widget.dart';
 import 'package:comunic/ui/widgets/safe_state.dart';
+import 'package:comunic/utils/date_utils.dart';
 import 'package:comunic/utils/intl_utils.dart';
 import 'package:flutter/material.dart';
 
@@ -67,25 +70,41 @@ class _UnreadConversationsScreenState
   }
 
   Widget _tileBuilder(BuildContext context, int index) {
-    /*final conv = _list[index];
-    final user = _users.getUser(conv.userID);
+    final conv = _list[index];
+
+    final message = _list[index].message;
+
+    final singleUserConv = conv.conv.members.length < 3;
+
+    String messageStr;
+    if (message.hasFile)
+      messageStr = tr("New file");
+    else if (message.hasMessage)
+      messageStr = singleUserConv
+          ? message.message.content
+          : tr("%1% : %2%", args: {
+              "1": _users.getUser(message.userID).fullName,
+              "2": message.message.content,
+            });
+    else
+      message.serverMessage.getText(_users);
+
     return ListTile(
-      leading: AccountImageWidget(user: user),
-      title: Text(user.displayName),
+      leading: ConversationImageWidget(
+        conversation: conv.conv,
+        users: _users,
+      ),
+      title: Text(ConversationsHelper.getConversationName(conv.conv, _users)),
       subtitle: RichText(
         text: TextSpan(style: Theme.of(context).textTheme.bodyText2, children: [
-          TextSpan(text: conv.convName.isNotEmpty ? conv.convName + "\n" : ""),
           TextSpan(
-            text: conv.message,
+            text: messageStr,
             style: TextStyle(fontStyle: FontStyle.italic),
           ),
         ]),
-      )
-      trailing: Text(diffTimeFromNowToStr(conv.lastActive)),
-      onTap: () => MainController.of(context).openConversation(conv.id),
-    );*/
-
-    // TODO : reimplement
-    throw new Exception("unimplemented");
+      ),
+      trailing: Text(diffTimeFromNowToStr(conv.message.timeSent)),
+      onTap: () => MainController.of(context).openConversation(conv.conv.id),
+    );
   }
 }