public override TextCaretPosition MoveDown(TextCaretPosition currentPosition)
{
var lyric = Lyrics.GetNextMatch(currentPosition.Lyric, lyricMovable);
if (lyric == null)
return null;
var index = Math.Clamp(currentPosition.Index, GetMinIndex(lyric.Text), GetMaxIndex(lyric.Text));
return new TextCaretPosition(lyric, index);
}
public override TimeTagIndexCaretPosition MoveDown(TimeTagIndexCaretPosition currentPosition)
{
var lyric = Lyrics.GetNextMatch(currentPosition.Lyric, l => !string.IsNullOrEmpty(l.Text));
if (lyric == null)
{
return(null);
}
var lyricTextLength = lyric.Text?.Length ?? 0;
var index = Math.Clamp(currentPosition.Index.Index, 0, lyricTextLength - 1);
var state = currentPosition.Index.State;
return(new TimeTagIndexCaretPosition(lyric, new TextIndex(index, state)));
}
public override TimeTagCaretPosition MoveDown(TimeTagCaretPosition currentPosition)
{
var currentTimeTag = currentPosition.TimeTag;
// need to check is lyric in time-tag is valid.
var currentLyric = timeTagInLyric(currentTimeTag);
if (currentLyric != currentPosition.Lyric)
{
throw new ArgumentException(nameof(currentPosition.Lyric));
}
var downTimeTag = Lyrics.GetNextMatch(currentLyric, l => l.TimeTags?.Any() ?? false)
?.TimeTags?.FirstOrDefault(x => x.Index >= currentTimeTag.Index && timeTagMovable(x));
return(timeTagToPosition(downTimeTag));
}
private Lyric getNextLyricWithTextTag(Lyric current, ITextTag textTag) => Lyrics.GetNextMatch(current, x => getRelatedTypeTextTag(x, textTag)?.Any() ?? false);
