/// <summary>
/// Act when the source collection has been changed.
/// </summary>
/// <param name="sender">The sender of the event</param>
/// <param name="e">The kind of modification</param>
private void Source_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
switch (e.Action)
{
case System.Collections.Specialized.NotifyCollectionChangedAction.Add:
foreach (var item in e.NewItems)
{
Elements.Add(new FieldExposer <T_Item>(DataAccessor, (T_Item)item));
}
break;
case System.Collections.Specialized.NotifyCollectionChangedAction.Remove:
if (e.OldItems.Count == 1)
{
T_Item item = (T_Item)e.OldItems[0];
var found = Elements.Where(element => element.InnerItem.Equals(item)).FirstOrDefault();
if (found == null)
{
throw new InvalidOperationException("Unexpected behavior: element not in list!");
}
Elements.Remove(found);
var selected = SelectedElements.Where(element => element.Equals(item)).FirstOrDefault();
if (selected != null)
{
SelectedElements.Remove(selected);
}
}
else
{
throw new InvalidOperationException("Cannot remove more than one item at once!");
}
break;
default:
Elements = new ObservableCollection <FieldExposer <T_Item> >();
foreach (var item in (ObservableCollection <T_Item>)sender)
{
Elements.Add(new FieldExposer <T_Item>(DataAccessor, (T_Item)item));
}
RaisePropertyChanged("Elements");
break;
}
}