/// <summary>
/// track every item in the host's list (these are data items)
/// Generate an appropriate depth for them
/// </summary>
/// <param name="host"></param>
private void UpdateItemsTracker(TwitterPanel host)
{
trackedItems = (from trackers in trackedItems
where host.Items.Contains(trackers.Item)
select trackers).ToList();
var newtrackers = from item in host.Items
where trackedItems.Any(t => t.Item.Equals(item)) == false
select MakeTracker(item, null);
trackedItems.AddRange(newtrackers);
// order trackedItems to be the right order according to the host
trackedItems = (from item in host.Items
select trackedItems.First(t => t.Item.Equals(item))).ToList();
// Adjust the depths for all the trackers, to account for new items
int depth = -300;
foreach (var track in trackedItems)
{
track.Z = depth;
depth -= 1000;
}
// join every item in the hosts data list with all our known tracked items
// this is a left join so we preserve existing tracker items
//var newlist = (from child in host.Items
// join known in trackedItems on child equals known.Item into joined
// from item in joined.DefaultIfEmpty()
// select MakeTracker(child, item)).ToList();
//int cnt = host.Items.Count;
//var x = (from child in host.Items
// join known in trackedItems on child equals known.Item into joined
// from item in joined.DefaultIfEmpty()
// where item == null
// select child).ToList();
//// Adjust the depths for all the trackers, to account for new items
//int depth = -300;
//foreach (var track in newlist)
//{
// track.Z = depth;
// depth -= 1000;
//}
//trackedItems = newlist;
}
void New3DPanel_Loaded(object sender, RoutedEventArgs e)
{
Host = ItemsControl.GetItemsOwner(this) as TwitterPanel;
Host.SelectionChanged += new SelectionChangedEventHandler(Host_SelectionChanged);
}