public static IList <CachedVisualTextLine> ConvertToCachedLines(this VisualCollection collection, int count, int omit = 0)
{
var fragment = collection.ToEnumerableOf <VisualTextLine>().Skip(omit).Take(count);
return(fragment.Select(line => {
var collapsedLine = line as CollapsedVisualTextLine;
var singleLine = line as SingleVisualTextLine;
if (collapsedLine != null)
{
return collapsedLine.ToCachedLine();
}
if (singleLine == null)
{
throw new ArgumentException(nameof(line));
}
return singleLine.ToCachedLine();
}).ToList());
}
