public override void redo()
{
// remove the specified rulers from the list of the layer,
// but do not delete it, also memorise its last position
mRulerIndex.Clear();
foreach (Layer.LayerItem obj in mRulers)
{
mRulerIndex.Add(mRulerLayer.removeRulerItem(obj as LayerRuler.RulerItem));
}
}
public override void undo()
{
// remove the specified RulerItem from the list of the layer,
// but do not delete it, also memorise its last position
mRulerItemIndex = mRulerLayer.removeRulerItem(mRulerItem);
}
