private async Task LoadChatMessages(DateTime datetime, bool isNewChatQuery)
{
if (isNewChatQuery)
{
EndTime = DateTime.Now;
}
else
{
IsScrollingTop = true;
}
List <ChatMessage> listChat = await _networkService.QueryChatAsync(App.User.api_token, EventId, Constants.ChatType.InternalChat, isNewChatQuery, datetime);
var hasNewChat = false;
if (listChat != null && listChat.Count > 0)
{
if (isNewChatQuery)
{
listChat.Reverse();
}
foreach (var chat in listChat)
{
chat.IsFromMe = chat.UserID == App.User.ID;
if (chat.CreateTime != DateTime.MinValue && BeginTime > chat.CreateTime)
{
BeginTime = chat.CreateTime.Value;
}
if (isNewChatQuery)
{
var existed = ChatMessages.Any(c => c.ChatID == chat.ChatID);
if (!existed)
{
hasNewChat = true;
ChatMessages.Add(chat);
}
}
else
{
hasNewChat = true;
ChatMessages.Insert(0, chat);
}
}
}
if (hasNewChat)
{
await RaisePropertyChanged(nameof(ChatMessages));
}
if (hasNewChat && isNewChatQuery && !IsScrollingTop)
{
await RaisePropertyChanged(nameof(RequestScroll));
}
}
private async void UpdateMessages()
{
var convo = await _store.GetConversationAsync(_conversationid);
if (convo == null)
{
DropEvents();
return;
}
var reader = convo.GetMessageReader();
var messages = await reader.ReadBatchAsync();
var currindex = ChatMessages.Count();
foreach (var message in messages)
{
if (ChatMessages.Any(x => x.messageId == message.Id))
{
break;
}
if (currindex > ChatMessages.Count())
{
currindex = ChatMessages.Count();
}
await CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
() =>
{
try
{
ChatMessages.Insert(currindex, new ChatMessageViewControl(message.Id));
}
catch
{
}
});
}
}