private void DirectoryChanged(object source, FileSystemEventArgs e)
{
/** New user entered chat */
if (e.ChangeType == WatcherChangeTypes.Created)
{
users.Add(e.Name);
// Need to call ToList since we modify each element in-place
foreach (var chatUi in chatUiList.ToList())
{
chatUi.AddUserToList(e.Name);
}
}
/** User left chat */
else if (e.ChangeType == WatcherChangeTypes.Deleted)
{
IChatUi disposedUserListManager = null;
// Need to call ToList since we modify each element in-place
foreach (var userListManager in chatUiList.ToList())
{
users.Remove(e.Name);
if (userListManager.Username != e.Name)
{
userListManager.RemoveUserFromList(e.Name);
}
else
{
disposedUserListManager = userListManager;
}
}
chatUiList.Remove(disposedUserListManager);
}
}
/// <summary>
/// Given a username, get its user interface
/// </summary>
/// <param name="username"></param>
/// <returns></returns>
private IChatUi getChatClient(string username)
{
if (chatClients.TryGetValue(username, out ChatInstance chatUiAndChannel))
{
IChatUi chatUi = chatUiAndChannel.Item1;
Debug.Assert(username == chatUi.Username);
return(chatUi);
}
throw new InvalidOperationException($"Username {username} not previously registered");
}
public void SendMessage(IChatUi chatClient, string recipient, string messageText)
{
try
{
var message = new Message(chatClient.Username, recipient, messageText);
Configuration.AppendToFile(recipient, message.ToString());
chatClient.AddChatLine(message);
}
catch (ArgumentException ae)
{
chatClient.AddChatErrorLine($"Message could not be sent :: {ae.Message}");
}
}
public void AddChatErrorLine(string username, string errorMessage)
{
IChatUi chatClient = getChatClient(username);
chatClient.AddChatErrorLine(errorMessage);
}
public void AppendParsedMessageToChat(string username, Message message)
{
IChatUi chatClient = getChatClient(username);
chatClient.AddChatLine(message);
}
public void RemoveChatUi(IChatUi chatInterface)
{
chatUiList.Remove(chatInterface);
}
public void AddChatUi(IChatUi chatInterface)
{
chatUiList.Add(chatInterface);
}
