/// <summary>
/// Reattach the property to the property in the specified object.
/// </summary>
public void Connect(object list)
{
Argument.NotNull(() => list);
if (this.list != null)
{
Disconnect();
}
this.list = (IList)list;
this.previousCollectionContent = this.list.Cast <object>().ToArray();
this.bindings = bindingsFactory.CreateListBindings(this.list).ToList();
var notifyCollectionChanged = this.list as INotifyCollectionChanged;
if (notifyCollectionChanged != null)
{
listSubscription = notifyCollectionChanged
.OnAnyCollectionChanges()
.Subscribe(e =>
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
{
bindings
.Where(b => b.ItemIndex >= e.NewStartingIndex + e.NewItems.Count - 1)
.Each(b => b.ItemIndex = b.ItemIndex + e.NewItems.Count);
e.NewItems.Cast <object>()
.Select((i, index) =>
{
return(bindingsFactory.CreateListBinding(i, e.NewStartingIndex + index, this.list));
})
.Each(b => bindings.Add(b));
}
break;
case NotifyCollectionChangedAction.Remove:
{
var bindingsToRemove = bindings
.Where(b =>
b.ItemIndex >= e.OldStartingIndex &&
b.ItemIndex < e.OldStartingIndex + e.OldItems.Count);
bindingsToRemove.Each(b => b.Disconnect());
bindings.RemoveAll(b => bindingsToRemove.Any(btr => btr == b));
bindings
.Where(b => b.ItemIndex >= e.OldStartingIndex + e.OldItems.Count)
.Each(b => b.ItemIndex = b.ItemIndex - e.OldItems.Count);
}
break;
case NotifyCollectionChangedAction.Reset:
{
bindings.Each(b => b.Disconnect());
bindings.Clear();
}
break;
default:
{
throw new ApplicationException("Unsupported operation for a bound list: " +
Enum.GetName(typeof(NotifyCollectionChangedAction), e.Action));
}
}
// This does not account for multiple items added or removed.
var binding = bindings.Where(b => b.ItemIndex == e.NewStartingIndex).FirstOrDefault();
if (e.Action != NotifyCollectionChangedAction.Add || binding != null)
{
listCollectionChangedEvents.OnNext(new BoundCollectionChangedEventArgs(null, e, binding, previousCollectionContent));
}
// Update previous collection content each time the list changes.
previousCollectionContent = this.list.Cast <object>().ToArray();
BindEventStreams();
});
}
BindEventStreams();
}
