public void MoveDown(FieldViewModel item)
{
if (item is null)
{
throw new ArgumentNullException(nameof(item));
}
var index = Fields.IndexOf(item);
if (index < 0)
{
return;
}
if (index == Fields.Count - 1)
{
return;
}
Fields.RemoveAt(index);
Fields.Insert(index + 1, item);
foreach (var field in Fields)
{
field.RefreshPosition();
}
}
public void Delete(FieldViewModel item)
{
if (item is null)
{
throw new ArgumentNullException(nameof(item));
}
Fields.Remove(item);
}
public void Add(FieldViewModel item)
{
if (item is null)
{
throw new ArgumentNullException(nameof(item));
}
Fields.Add(item);
}
bool IContainer <FieldViewModel> .CanMoveDown(FieldViewModel item)
{
if (item is null)
{
throw new ArgumentNullException(nameof(item));
}
var index = Fields.IndexOf(item);
if (index < 0)
{
return(false);
}
return(index < Fields.Count - 1);
}