public IEnumerable <int> MoveDown(IEnumerable <int> selection)
{
lock (this)
{
var newSelection = new int[selection.Count()];
int upperBound = Images.Count - 1;
int j = 0;
foreach (int i in selection.OrderByDescending(x => x))
{
if (i != upperBound--)
{
ScannedImage img = Images[i];
Images.RemoveAt(i);
Images.Insert(i + 1, img);
img.MovedTo(i + 1);
newSelection[j++] = i + 1;
}
else
{
newSelection[j++] = i;
}
}
return(newSelection);
}
}
public IEnumerable <int> MoveTo(IEnumerable <int> selection, int index)
{
var selList = selection.ToList();
var bottom = selList.Where(x => x < index).OrderByDescending(x => x).ToList();
var top = selList.Where(x => x >= index).OrderBy(x => x).ToList();
int offset = 1;
foreach (int i in bottom)
{
ScannedImage img = Images[i];
Images.RemoveAt(i);
Images.Insert(index - offset, img);
img.MovedTo(index - offset);
offset++;
}
offset = 0;
foreach (int i in top)
{
ScannedImage img = Images[i];
Images.RemoveAt(i);
Images.Insert(index + offset, img);
img.MovedTo(index + offset);
offset++;
}
return(Enumerable.Range(index - bottom.Count, selList.Count));
}
public IEnumerable <int> MoveUp(IEnumerable <int> selection)
{
lock (this)
{
var newSelection = new int[selection.Count()];
int lowerBound = 0;
int j = 0;
foreach (int i in selection.OrderBy(x => x))
{
if (i != lowerBound++)
{
ScannedImage img = Images[i];
Images.RemoveAt(i);
Images.Insert(i - 1, img);
img.MovedTo(i - 1);
newSelection[j++] = i - 1;
}
else
{
newSelection[j++] = i;
}
}
return(newSelection);
}
}