comunicmobile/lib/lists/conversation_messages_list.dart

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;
  }

  /// Get the ID of the last message present in this list
  int get lastMessageID {
    int lastMessageID = 0;
    for (ConversationMessage message in this)
      if (message.id > lastMessageID) lastMessageID = message.id;
    return lastMessageID;
  }

  /// Get the ID of the first message present in this list
  int get firstMessageID {
    int firstMessageID = this[0].id;
    for (ConversationMessage message in this)
      if (message.id < firstMessageID) firstMessageID = message.id;
    return firstMessageID;
  }
}