internal void AddPreviousMessages(IEnumerable <ChatMessageViewModel> messages)
{
bool hasUpdates = false;
_messages.IsNotifying = false;
foreach (var chatMessage in messages.Reverse())
{
chatMessage.HasBeenSeen = true;
var firstMessageGroup = _messages.FirstOrDefault() as ChatMessageGroupViewModel;
if (firstMessageGroup == null || !firstMessageGroup.TryAddPreviousMessage(chatMessage))
{
var groupMessage = new ChatMessageGroupViewModel(chatMessage);
_messages.Insert(0, groupMessage);
hasUpdates = true;
}
}
_messages.IsNotifying = true;
if (hasUpdates)
{
_messages.Refresh();
}
IsRequestingPreviousMessages = false;
}
public static void Replace <T>(this IObservableCollection <T> collection, IEnumerable <T> items)
{
collection.IsNotifying = false;
collection.Clear();
collection.AddRange(items);
collection.IsNotifying = true;
collection.Refresh();
}