Get conversation message

lib/lists/conversation_messages_list.dart

@@ -0,0 +1,35 @@
+import 'dart:collection';
+
+import 'package:comunic/models/conversation_message.dart';
+
+/// Conversations messages list
+///
+/// @author Pierre HUBERT
+
+class ConversationMessagesList extends ListBase<ConversationMessage> {
+  final List<ConversationMessage> _list = List();
+
+  set length(int v) => _list.length = v;
+
+  int get length => _list.length;
+
+  @override
+  ConversationMessage operator [](int index) {
+    return _list[index];
+  }
+
+  @override
+  void operator []=(int index, ConversationMessage value) {
+    _list[index] = value;
+  }
+
+  /// Get the list of the users ID who own a message in this list
+  List<int> getUsersID() {
+    final List<int> users = List();
+
+    for (ConversationMessage message in this)
+      if (!users.contains(message.userID)) users.add(message.userID);
+
+    return users;
+  }
+}

lib/lists/users_list.dart

@@ -7,10 +7,10 @@ import 'package:comunic/models/user.dart';
 /// @author Pierre HUBERT
 
 class UsersList extends ListBase<User> {
-
   List<User> _list = List();
 
   int get length => _list.length;
+
   set length(l) => _list.length = l;
 
   @override
@@ -24,11 +24,13 @@ class UsersList extends ListBase<User> {
   }
 
   /// Find a user with a specific ID
-  User getUser(int userID){
-    for(int i = 0; i < this.length; i++)
-      if(this[i].id == userID)
-        return this[i];
+  User getUser(int userID) {
+    for (int i = 0; i < this.length; i++)
+      if (this[i].id == userID) return this[i];
 
-      throw "User not found in the list!";
+    throw "User not found in the list!";
   }
-}
+
+  /// Get the list of users ID present in this list
+  List<int> get usersID => List.generate(length, (i) => this[i].id);
+}