public void remove(IPuzzleLayer layer)
{
var i = layer.GetLayerIndex();
layers.RemoveAt(i);
layer.SetLayerIndex(Tool.NullIndex);
refreshLayerDepth();
}
public void add(IPuzzleLayer layer)
{
if (layers.Count == 0)
{
layer.SetLayerIndex(0);
layers.Add(layer);
}
else
{
upToDownInsert(layer);
}
refreshLayerDepth();
}