private void Users_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Remove)
{
foreach (TrackedUser item in e.OldItems)
{
var instance = vm.Users.FirstOrDefault(vm => vm.UserId == item.UserId);
if (instance != null)
{
vm.Users.Remove(instance);
}
}
}
else if (e.Action == NotifyCollectionChangedAction.Add)
{
foreach (TrackedUser item in e.NewItems)
{
var instance = vm.Users.FirstOrDefault(vm => vm.UserId == item.UserId);
if (instance != null)
{
return;
}
var newInstance = new TrackedUserViewModel();
ViewModelMapper.TrackedUser(item, newInstance);
vm.Users.Add(newInstance);
}
}
if (e.Action == NotifyCollectionChangedAction.Replace)
{
foreach (TrackedUser item in e.NewItems)
{
var instance = vm.Users.FirstOrDefault(vm => vm.UserId == item.UserId);
if (instance == null)
{
instance = new TrackedUserViewModel();
vm.Users.Add(instance);
}
ViewModelMapper.TrackedUser(item, instance);
}
}
if (e.Action == NotifyCollectionChangedAction.Move)
{
foreach (TrackedUser item in e.NewItems)
{
var instance = vm.Users.FirstOrDefault(vm => vm.UserId == item.UserId);
if (instance == null)
{
instance = new TrackedUserViewModel();
vm.Users.Add(instance);
}
ViewModelMapper.TrackedUser(item, instance);
//force sort
_ = vm.Users;
}
}
vm.LastUpdate = DateTime.Now;
}