public Caption PreviousCaption(Caption caption)
{
var idx = Captions.IndexOf(caption);
if (idx == 0)
{
return(null);
}
return(Captions[idx - 1]);
}
public Caption NextCaption(Caption caption)
{
var idx = Captions.IndexOf(caption);
if (idx >= Captions.Count - 1)
{
return(null);
}
return(Captions[idx + 1]);
}
