/// <summary>
/// Загрузить порцию элементов.
/// </summary>
/// <param name="count">Количество элементов для загрузки.</param>
public IAsyncOperation <LoadMoreItemsResult> LoadMoreItemsAsync(uint count)
{
return(Task.Run <LoadMoreItemsResult>(async() =>
{
State = ContentState.Loading;
uint resultCount = 0;
_canLoad = false;
if (count < 20)
{
count = 20;
}
else if (count > 60)
{
count = 60;
}
var request = new ExecuteGetDialogsRequest()
{
Count = count, Offset = (uint)Count, PreviewLength = 100
};
var result = await request.ExecuteAsync();
await CoreHelper.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
if (result.Error.ErrorType == VKErrors.None)
{
_totalCount = (ulong)result.Response.Dialogs.Count;
for (int i = 0; i < result.Response.Dialogs.Items.Count; i++)
{
var dialog = result.Response.Dialogs.Items[i];
if (dialog.IsChat)
{
this.Add(dialog);
continue;
}
var user = result.Response.Users.First(p => p.ID == dialog.Message.UserID);
dialog.Message.Title = user.FullName;
this.Add(dialog);
}
State = Count == 0 ? ContentState.NoData : ContentState.Normal;
UpdateCanLoad();
}
else
{
State = ContentState.Error;
_canLoad = false;
}
});
await ServiceHelper.MessagesCacheService.CacheDialogs(this.Take(30).ToList());
#if DEBUG
Debug.WriteLine("Total dialogs count: " + this.Count);
#endif
return new LoadMoreItemsResult {
Count = resultCount
};
}).AsAsyncOperation <LoadMoreItemsResult>());
}
/// <summary>
/// Возвращает коллекцию диалогов по указанным параметрам.
/// </summary>
/// <param name="offset">Смещение списка.</param>
/// <param name="count">Количество элементов.</param>
/// <param name="unread">Вернуть только непрочитанные.</param>
private async Task <List <VKDialog> > GetDialogsWithParameters(uint offset, uint count, bool unread = false)
{
var dialogsRequest = new ExecuteGetDialogsRequest
{
Offset = offset,
Count = count,
PreviewLength = 60,
Unread = unread ? VKBoolean.True : VKBoolean.False
};
var dialogsResponse = await dialogsRequest.ExecuteAsync();
if (dialogsResponse.Error.ErrorType != VKErrors.None)
{
return(null);
}
if (unread)
{
totalUnreadCount = dialogsResponse.Response.Dialogs.Count;
}
else
{
totalCount = dialogsResponse.Response.Dialogs.Count;
}
foreach (var user in dialogsResponse.Response.Users)
{
Service.CachedUsers[user.ID] = user;
}
List <VKDialog> result = new List <VKDialog>();
var unknownChats = new List <VKDialog>();
foreach (var dialog in dialogsResponse.Response.Dialogs.Items)
{
dialog.Message.Sender = dialogsResponse.Response.Users.FirstOrDefault(u => u.ID == dialog.Message.UserID);
if (dialog.IsChat)
{
unknownChats.Add(dialog);
}
else if (dialog.Message.Sender != null)
{
dialog.Message.Title = dialog.Message.Sender.FullName;
dialog.Photos = new ObservableCollection <string> {
dialog.Message.Sender.Photo50
};
}
result.Add(dialog);
}
if (result.Count == 0)
{
return(result);
}
var usersRequest = new GetChatsUsersRequest {
ChatIDs = unknownChats.Select(d => d.Message.ChatID).ToList()
};
var usersResponse = await usersRequest.ExecuteAsync();
if (usersResponse.Error.ErrorType != VKErrors.None)
{
return(null);
}
foreach (uint chatID in usersResponse.Response.Keys)
{
var users = usersResponse.Response[chatID];
var dialog = unknownChats.FirstOrDefault(d => d.Message.ChatID == chatID);
dialog.Photos = new ObservableCollection <string>();
if (!String.IsNullOrEmpty(dialog.Message.Photo50))
{
dialog.Photos.Add(dialog.Message.Photo50);
continue;
}
foreach (var user in users)
{
dialog.Photos.Add(user.Photo50);
Service.CachedUsers[user.ID] = user;
}
}
return(result);
}
