public override DataTemplate SelectTemplate(object item, DependencyObject container)
{
FrameworkElement element = container as FrameworkElement;
if (element != null && item != null && item is DialogItemViewModel)
{
DialogItemViewModel dialog = item as DialogItemViewModel;
if (dialog.GroupPhoto100 != null)
{
return(element.FindResource("Group") as DataTemplate);
}
if (dialog.ChatActive == null || dialog.UserCount == null)
{
return(element.FindResource("One") as DataTemplate);
}
if (dialog.ChatActive.Count == 2)
{
return(element.FindResource("Two") as DataTemplate);
}
if (dialog.ChatActive.Count == 3)
{
return(element.FindResource("Three") as DataTemplate);
}
if (dialog.ChatActive.Count >= 4)
{
return(element.FindResource("Four") as DataTemplate);
}
}
return(null);
}
/// <summary>
/// возвращает список диалогов
/// </summary>
/// <returns></returns>
public async Task <ObservableCollection <DialogItemViewModel> > GetDialog()
{
_dialogModel = await _vkApi.Messages.GetDialogsAsync(_count, _index);
ObservableCollection <DialogItemViewModel> itemsDialog = new ObservableCollection <DialogItemViewModel>();
foreach (var item in _dialogModel.response.items)
{
DialogItemViewModel itemDialog = new DialogItemViewModel()
{
Title = item.message.title,
UserId = item.message.user_id,
Body = item.message.body,
GroupPhoto100 = item.message.photo_100,
GroupPhoto200 = item.message.photo_200,
GroupPhoto50 = item.message.photo_50,
UserCount = item.message.users_count,
ChatActive = item.message.chat_active,
ReadState = item.message.read_state,
Date = item.message.date,
Out = item.message.@out,
ChatId = item.message.chat_id,
Attachment = item.message.attachments,
Unread = item.unread
};
itemsDialog.Add(itemDialog);
}
CountDialog = _dialogModel.response.count;
if (users == null || thisUser == null)
{
//если несколько пользователей то берем их из ChatActive если 1 то userId
//собираем все их id
HashSet <int> userIdList = new HashSet <int>();
foreach (var item in itemsDialog)
{
if (item.UserCount == 1 || item.UserCount == null)
{
if (!userIdList.Contains(item.UserId))
{
userIdList.Add(item.UserId);
}
}
if (item.UserCount > 1)
{
foreach (var id in item.ChatActive)
{
if (!userIdList.Contains(id))
{
userIdList.Add(id);
}
}
}
}
string userIds = String.Join(",", userIdList);
//получаем всю необходимую информацию о пользовалелях кто в диалогах
users = await _vkApi.Users.GetPhotoAsync(userIds);
thisUser = await _vkApi.Users.GetAsync();
}
//здесь в зависимости от количества собеседников подгружаем фотки
foreach (var item in itemsDialog)
{
//проверка что в сообщении есть вложения
//определяем тип вложения и пишем его в сообщение
if (item.Attachment != null) // если ли вложения?
{
switch (item.Attachment[0].type)
{
case "photo":
item.Body = "Фотография";
break;
case "audio":
item.Body = "Аудиозапись";
break;
case "gift":
item.Body = "Подарок";
break;
case "wall":
item.Body = "Запись на стены";
break;
case "video":
item.Body = "Видеозапись";
break;
case "sticker":
item.Body = "Стикер";
break;
case "doc":
item.Body = "Документ";
break;
case "link":
item.Body = "Ссылка";
break;
default:
item.Body = item.Attachment[0].type;
break;
}
}
if (item.ChatActive == null || item.UserCount == null)
{
try
{
var userTemp = users.response.Find(i => i.id == item.UserId);
item.UserOnePhoto = userTemp.photo_100;
item.Title = userTemp.first_name + " " + userTemp.last_name;
if (item.Out == 1)
{
item.UserIdPhoto = thisUser.response[0].photo_100;
}
}
catch { }
continue;
}
var user = users.response.Find(i => i.id == item.UserId);
if (user != null)
{
item.UserIdPhoto = user.photo_100;
item.LastMessageUserName = user.first_name + " " + user.last_name;
}
if (item.ChatActive.Count == 2)
{
item.UserOnePhoto = users.response.Find(i => i.id == item.ChatActive[0]).photo_100;
item.UserTwoPhoto = users.response.Find(i => i.id == item.ChatActive[1]).photo_100;
continue;
}
if (item.ChatActive.Count == 3)
{
item.UserOnePhoto = users.response.Find(i => i.id == item.ChatActive[0]).photo_100;
item.UserTwoPhoto = users.response.Find(i => i.id == item.ChatActive[1]).photo_100;
item.UserThreePhoto = users.response.Find(i => i.id == item.ChatActive[2]).photo_100;
continue;
}
if (item.ChatActive.Count >= 4)
{
item.UserOnePhoto = users.response.Find(i => i.id == item.ChatActive[0]).photo_100;
item.UserTwoPhoto = users.response.Find(i => i.id == item.ChatActive[1]).photo_100;
item.UserThreePhoto = users.response.Find(i => i.id == item.ChatActive[2]).photo_100;
item.UserFourPhoto = users.response.Find(i => i.id == item.ChatActive[3]).photo_100;
}
}
if (_dialogsViewModel == null)
{
_dialogsViewModel = itemsDialog;
}
else
{
itemsDialog.ToList().ForEach(_dialogsViewModel.Add);
}
_index += _count;
users = null;
thisUser = null;
return(_dialogsViewModel);
}
