/// <summary>
/// Call this method ONLY and ONLY if you have got Long Poll History already.
/// </summary>
/// <param name="id"></param>
/// <param name="isConference"></param>
public void LoadMoreMessages(int id, bool isConference)
{
if (_currentChatViewModel == null)
return;
IsLoadingMessagesHistory = true;
var currentMessages = _messagesCache.GetItems(id);
// Only and only if any messages already presents, we may load more elder data (since we think, that this data is latest and greatest).
// Otherwise we can get unsynchronized data with VK.
int number = _currentChatViewModel.Messages.Count;
if (number < currentMessages.Count)
{
try
{
// Where from to start take.
int start = currentMessages.Count - number;
// how much take.
int finish = start - MESSAGES_COUNT;
if (finish < 0)
finish = 0;
for (int i = start - 1; i >= finish; i--)
{
_currentChatViewModel.AddOldMessage(currentMessages[i]);
}
_currentChatViewModel.UpdateStatusInfo();
IsLoadingMessagesHistory = false;
}
catch (Exception ex)
{
Debug.WriteLine("_UpdateCurrentMessagesList failed: " + ex.Message);
}
}
else //currentMessages.Any())
{
if (isConference)
{
// load chat messages
MessagesGet getMessages = new MessagesGet(-1, id, currentMessages.Count, MESSAGES_COUNT, _UpdateCurrentMessagesList);
getMessages.Execute();
}
else
{
// load messages of user
MessagesGet getMessages = new MessagesGet(id, -1, currentMessages.Count, MESSAGES_COUNT, _UpdateCurrentMessagesList);
getMessages.Execute();
}
}
}
/// <summary>
///
/// </summary>
/// <param name="id"></param>
/// <param name="isConference"></param>
/// <returns></returns>
public ChatViewModel GetChatViewModel(int id, bool isConference)
{
_currentChatId = id;
_isCurrentConference = isConference;
try
{
var currentMessages = _messagesCache.GetItems(id);
string title = EntitiesHelpers.GetChatTitle(id, isConference);
// Load only 30 first from cache.
int finish = currentMessages.Count - MESSAGES_COUNT;
if (finish < 0)
finish = 0;
int count = MESSAGES_COUNT;
if (currentMessages.Count < count)
count = currentMessages.Count;
var filtered = new Message[count];// new List<Message>(MESSAGES_COUNT);
for (int i = currentMessages.Count - 1, j = count - 1; i >= finish; i--, j--)
filtered[j] = currentMessages[i];
_currentChatViewModel = new ChatViewModel(id, title, isConference, filtered, _imageCache);
if (!currentMessages.Any()) // Get messages only first time for this chat.
{
MessagesGet getMessages = null;
if (isConference)
getMessages = new MessagesGet(-1, id, 0, MESSAGES_COUNT, _UpdateCurrentMessagesList);
else
getMessages = new MessagesGet(id, -1, 0, MESSAGES_COUNT, _UpdateCurrentMessagesList);
getMessages.Execute();
}
else
_UpdateReadStatusOfMessages(currentMessages); // This method will be called in _UpdateCurrentMessagesList
_currentChatViewModel.UpdateStatusInfo();
}
catch (Exception ex)
{
Debug.WriteLine("GetChatViewModel failed: " + ex.Message);
}
return _currentChatViewModel;
}