private Tuple<Changes, ListBoxItem> GetChanges(SelectionChangedEventArgs selch)
{
Changes ch = new Changes(ListBoxOwner);
selch.AddedItems.Cast<object>().Apply(o => ch.AddSelected(o));
selch.RemovedItems.Cast<object>().Apply(o => ch.AddRemoved(o));
ListBoxItem lbi = ch.AddedSelectedListBoxItem
.Union(ch.RemovedSelectedListBoxItem)
.Union(ListBoxOwner.SelectedItems.Cast<object>().Select(ch.Convert))
.Where(lbic => ((lbic != null) && (lbic.IsMouseOver)))
.FirstOrDefault();
return new Tuple<Changes, ListBoxItem>(ch, lbi);
}
internal void ApplyChanges(ListBoxItem lbi, Changes ichanges)
{
StopCurrentAnimation();
SynchronizeApplyChanges(lbi, ichanges);
}
private void SynchronizeApplyChanges(ListBoxItem lbi, Changes ichanges)
{
UpdateDisplay(lbi, ichanges);
if (ichanges.AddedSelectedListBoxItem.Contains(lbi))
{
OnSelect(lbi);
}
else if (ichanges.RemovedSelectedListBoxItem.Contains(lbi))
{
OnUnSelect(lbi);
}
}
internal void UpdateDisplay(ListBoxItem lbi, Changes ichanges)
{
ListBox lb = this.ListBoxOwner;
if (lb == null)
{
RefreshDisplay();
return;
}
var Fact = lb.ItemContainerGenerator;
int UnchangedObjectIndex = Fact.IndexFromContainer(lbi);
HashSet<object> Currentselected = lb.SelectedItems.Cast<object>().ToHashSet();
HashSet<object> OldSelected = Currentselected.Where(o => !ichanges.AddeddSelected.Contains(o)).Union(ichanges.RemovedSelected).ToHashSet();
int OldIndex = IntIndexDeb(UnchangedObjectIndex, o => OldSelected.Contains(o));
int NewIndex = IntIndexDeb(UnchangedObjectIndex, o => Currentselected.Contains(o));
if (NewIndex != OldIndex)
{
if (!TrySetHorizontalOffset(HorizontalOffset + NewIndex - OldIndex))
RefreshDisplay();
}
else
{
RefreshDisplay();
}
}