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
  Set<int> getUsersID() {
    final Set<int> users = Set();

    for (ConversationMessage message in this) users.addAll(message.usersID);

    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;
  }

  /// Replace a message by another one (if any)
  void replace(ConversationMessage msg) {
    final index = this.indexWhere((t) => t.id == msg.id);
    if (index >= 0) this[index] = msg;
  }

  /// Remove a message from this list
  void removeMsg(int id) => removeWhere((f) => f.id == id);
}