/// <summary>
///
/// </summary>
/// <param name="source"></param>
/// <param name="interpolation">相对于当前播放项的距离</param>
/// <returns></returns>
public async Task <PlaybackItem> PushToRelative(MusicUi source, int interpolation)
{
if (source.IsPlaying)
{
return(null);
}
if (!DbContext.PlaybackList.Any())
{
await PushGroup(new[] { source });
return(null);
}
MediaPlaybackItem playItem;
try
{
playItem = await source.GetPlaybackItem();
}
catch (Exception)
{
await _manageService.RemoveMusicData(new[] { source });
return(null);
}
var dbPlayList = DbContext.PlaybackList.OrderBy(pi => pi.TrackId).ToList();
int trackId = (int)_playbackList.CurrentItemIndex;
var dbPlayItem = await DbContext.PlaybackList.FirstOrDefaultAsync(pi => pi.MusicFileId == source.Id);
if (dbPlayItem != null)
{
_playbackList.Items.Remove(_playbackList.Items[dbPlayItem.TrackId]);
dbPlayList.Remove(dbPlayItem);
}
int targetId = trackId + interpolation;
if (targetId < 0)
{
targetId = 0;
}
else if (targetId > dbPlayList.Count)
{
targetId = dbPlayList.Count;
}
var newItem = dbPlayItem == null ? new PlaybackItem(source.Id) : dbPlayItem;
dbPlayList.Insert(targetId, newItem);
SetUpTrackId(dbPlayList, targetId);
DbContext.PlaybackList.UpdateRange(dbPlayList);
await DbContext.SaveChangesAsync();
_playbackList.Items.Insert(targetId, playItem);
return(newItem);
}
public async Task PushImmediately(MusicUi source)
{
if (source.IsPlaying)
{
return;
}
var item = await PushToRelative(source, -1);
if (item != null)
{
_playbackList.MoveTo((uint)item.TrackId);
}
}
public async Task PushGroup(IEnumerable <MusicUi> source, MusicUi needPlayItem = null)
{
var sourceList = source.ToList();
bool isEqual = sourceList.Count == DbContext.PlaybackList.Count();
if (isEqual)
{
var dbDataList = DbContext.PlaybackList.OrderBy(pi => pi.TrackId).ToList();
for (int i = 0; i < sourceList.Count; i++)
{
if (sourceList[i].Id != dbDataList[i].MusicFileId)
{
isEqual = false;
break;
}
if (i > 10)
{
break;
}
}
}
if (!isEqual)
{
var dbPlayList = new List <PlaybackItem>();
var playList = new List <MediaPlaybackItem>();
var removeList = new List <MusicUi>();
await LoadFilesAsync(async() =>
{
for (int i = 0; i < sourceList.Count; i++)
{
var item = sourceList[i];
try
{
playList.Add(await item.GetPlaybackItem());
dbPlayList.Add(new PlaybackItem(item.Id, i));
}
catch (Exception)
{
removeList.Add(item);
continue;
}
}
});
var pi = dbPlayList.FirstOrDefault();
if (pi != null)
{
pi.IsPlaying = true;
}
removeList.ForEach(item => sourceList.Remove(item));
await _manageService.RemoveMusicData(removeList);
CleanDbAndList();
DbContext.PlaybackList.AddRange(dbPlayList);
await DbContext.SaveChangesAsync();
playList.ForEach(_playbackList.Items.Add);
}
if (!DbContext.PlaybackList.Any())
{
return;
}
var npi = needPlayItem ?? sourceList.First();
var p = DbContext.PlaybackList.FirstOrDefault(pi => pi.MusicFileId == npi.Id);
if (p != null && p.TrackId != 0)
{
_playbackList.MoveTo((uint)p.TrackId);
}
else
{
NotifyPlayItemChange(DbContext.PlaybackList.First(pi => pi.TrackId == 0));
}
}
