private void RedoOperation(EraseOperation operation)
{
var stroke = (from item in Container.InkStrokes
where item.Id == operation.StrokeId
select item).FirstOrDefault();
if (stroke == null)
{
return;
}
if (operation.Index == 0)
{
// trim off the beginning
// stroke.Points.RemoveAt(0);
}
else
{
// var newPoints = stroke.Points.Take(operation.Index);
// stroke.Points = new List<Point>(newPoints);
if (operation.NewStroke != null)
{
Container.Add(new[] { operation.NewStroke });
}
}
}
private void UndoOperation(EraseOperation operation)
{
var stroke = (from item in Container.InkStrokes
where item.Id == operation.StrokeId
select item).FirstOrDefault();
if (stroke == null)
{
return;
}
//stroke.Points.Add(operation.Point);
if (operation.NewStroke != null)
{
//stroke.Points.AddRange(operation.NewStroke.Points);
Container.Remove(operation.NewStroke);
}
}