public ITextPosition Down()
{
ITextPosition nextline = NextLine()?.NextLine()?.Prev();
if (nextline == null)
{
return(item.Core.GetLastPosition());
}
if (nextline.Column > this.Column)
{
nextline = nextline.Move(this.Column - nextline.Column);
}
return(nextline ?? item.Core.GetLastPosition());
}
public ITextPosition Up()
{
ITextPosition prevline = PrevLine();
if (prevline == null)
{
return(item.Core.GetFirstPosition());
}
if (prevline.Column > this.Column)
{
prevline = prevline.Move(this.Column - prevline.Column);
}
return(prevline ?? item.Core.GetFirstPosition());
}
