private IEnumerable <RectTransform> FindInvisibles(RangeInt viewRange)
{
var hides = visibles.Keys.Except(viewRange.GetEnumerable()).ToArray();
foreach (var i in hides)
{
visibles.Remove(i);
}
return(rectChildren.Except(visibles.Values).ToArray());
}
private void UpdateChildIndex(RangeInt viewRange)
{
var invisibles = FindInvisibles(viewRange).GetEnumerator();
var newlyVisibles = viewRange.GetEnumerable().Except(visibles.Keys);
foreach (var index in newlyVisibles)
{
if (invisibles.MoveNext() == false)
{
break;
}
var invisible = invisibles.Current;
visibles.Add(index, invisible);
}
}