LinkedList<EditableRun> CollectLeftRuns(EditableRun t)
{
if (t.IsLineBreak)
{
throw new NotSupportedException();
}
LinkedList<EditableRun> colllectRun = new LinkedList<EditableRun>();
foreach (EditableRun r in GetVisualElementForward(this.FirstRun, t))
{
colllectRun.AddLast(r);
}
return colllectRun;
}
LinkedList<EditableRun> CollectRightRuns(EditableRun t)