private static void Compute_CollectionChanged(ISelectionableControl lb, IList l, NotifyCollectionChangedEventArgs e)
{
if (l == null)
return;
if (e.Action == NotifyCollectionChangedAction.Reset)
{
lb.SelectedItems.Clear();
InitCollection(l, lb);
return;
}
if (e.NewItems != null)
{
e.NewItems.Cast<object>().Apply(o => lb.SelectedItems.Add(o));
}
if (e.OldItems != null)
{
e.OldItems.Cast<object>().Apply(o => lb.SelectedItems.Remove(o));
}
}
private static void RegisterIfPossible(IList ientry, ISelectionableControl icontainer)
{
INotifyCollectionChanged inc = ientry as INotifyCollectionChanged;
if (inc != null)
{
HashSet<ISelectionableControl> listeners = null;
if (!_Mapped.TryGetValue(inc, out listeners))
{
listeners = new HashSet<ISelectionableControl>();
_Mapped.Add(inc, listeners);
inc.CollectionChanged += inc_CollectionChanged;
}
listeners.Add(icontainer);
}
}
private static void UnregisterIfPossible(IList ientry, ISelectionableControl icontainer)
{
INotifyCollectionChanged inc = ientry as INotifyCollectionChanged;
if (inc != null)
{
HashSet<ISelectionableControl> listeners = _Mapped[inc];
listeners.Remove(icontainer);
if (listeners.Count==0)
{
_Mapped.Remove(inc);
inc.CollectionChanged -= inc_CollectionChanged;
}
}
}
private static void InitCollection(IList ilis, ISelectionableControl lb)
{
ilis.Cast<object>().Apply(o => lb.SelectedItems.Add(o));
}
