/// <summary>
/// NavigationToNext
/// </summary>
/// <param name="karaokeField"></param>
public static void NavigationToNext(this IAmKaraokeField karaokeField)
{
var nowObjectIndex = karaokeField.FindObjectIndexByCurrentTime();
var list = karaokeField.GetListHitObjects();
if (nowObjectIndex < list.Count - 2)
{
karaokeField.NavigateToTime(list[nowObjectIndex + 2].StartTime - PrepareTime);
}
}
/// <summary>
/// NavigationToPrevious
/// </summary>
/// <param name="karaokeField"></param>
public static void NavigationToPrevious(this IAmKaraokeField karaokeField)
{
var nowObjectIndex = karaokeField.FindObjectIndexByCurrentTime();
if (nowObjectIndex > 1)
{
var list = karaokeField.GetListHitObjects();
karaokeField.NavigateToTime(list[nowObjectIndex - 1].StartTime - PrepareTime);
}
}
/// <summary>
/// FindObjectByCurrentTime
/// </summary>
/// <param name="karaokeField"></param>
/// <returns></returns>
public static HitObject FindObjectByCurrentTime(this IAmKaraokeField karaokeField)
{
var currentTime = karaokeField.GetCurrentTime();
var listObjects = karaokeField.GetListHitObjects();
for (var i = 0; i < listObjects.Count; i++)
{
if (listObjects[i].StartTime >= currentTime + PrepareTime)
{
if (i == 0)
{
return(null);
}
return(listObjects[i - 1]);
}
}
return(null);
}
/// <summary>
/// FindObjectIndexByCurrentTime
/// </summary>
/// <param name="karaokeField"></param>
/// <returns></returns>
public static int FindObjectIndexByCurrentTime(this IAmKaraokeField karaokeField)
{
var hitObject = karaokeField.FindObjectByCurrentTime();
if (hitObject == null)
{
return(-1);
}
var listObjects = karaokeField.GetListHitObjects();
for (var i = 0; i < listObjects.Count; i++)
{
if (listObjects[i] == hitObject)
{
return(i);
}
}
//404
return(-1);
}
/// <summary>
/// Last object's time
/// </summary>
/// <param name="karaokeField"></param>
/// <returns></returns>
public static double LastObjectTime(this IAmKaraokeField karaokeField)
{
var hitObjects = karaokeField.GetListHitObjects();
return(((hitObjects.Last() as IHasEndTime)?.EndTime ?? hitObjects.Last().StartTime) + 1);
}
