public PlaylistTrack(Playlist playlist, Track track, int trackNo, bool isStoring = true)
{
Key = StorageExtensions.NoKey;
Playlist = playlist;
Track = track;
TrackNo = trackNo;
Playlist.AddToPlaylistTracks(this);
Track.AddToPlaylistTracks(this);
onConstruct();
if (DC.Data.IsTransaction)
{
DC.Data.AddTransaction(new TransactionItem(3, TransactionActivityEnum.New, Key, this));
}
if (isStoring)
{
Store();
}
}
private PlaylistTrack(int key, CsvReader csvReader)
{
Key = key;
var playlistKey = csvReader.ReadInt();
Playlist = DC.Data._Playlists.GetItem(playlistKey) ?? Playlist.NoPlaylist;
var trackKey = csvReader.ReadInt();
Track = DC.Data._Tracks.GetItem(trackKey) ?? Track.NoTrack;
TrackNo = csvReader.ReadInt();
if (Playlist != Playlist.NoPlaylist)
{
Playlist.AddToPlaylistTracks(this);
}
if (Track != Track.NoTrack)
{
Track.AddToPlaylistTracks(this);
}
onCsvConstruct();
}
public void Update(Playlist playlist, Track track, int trackNo)
{
if (Key >= 0)
{
if (playlist.Key < 0)
{
throw new Exception($"PlaylistTrack.Update(): It is illegal to add stored PlaylistTrack '{this}'" + Environment.NewLine +
$"to Playlist '{playlist}', which is not stored.");
}
if (track.Key < 0)
{
throw new Exception($"PlaylistTrack.Update(): It is illegal to add stored PlaylistTrack '{this}'" + Environment.NewLine +
$"to Track '{track}', which is not stored.");
}
}
var clone = new PlaylistTrack(this);
var isCancelled = false;
onUpdating(playlist, track, trackNo, ref isCancelled);
if (isCancelled)
{
return;
}
//remove not yet updated item from parents which will be removed by update
var hasPlaylistChanged = Playlist != playlist;
if (hasPlaylistChanged)
{
Playlist.RemoveFromPlaylistTracks(this);
}
var hasTrackChanged = Track != track;
if (hasTrackChanged)
{
Track.RemoveFromPlaylistTracks(this);
}
//update properties and detect if any value has changed
var isChangeDetected = false;
if (Playlist != playlist)
{
Playlist = playlist;
isChangeDetected = true;
}
if (Track != track)
{
Track = track;
isChangeDetected = true;
}
if (TrackNo != trackNo)
{
TrackNo = trackNo;
isChangeDetected = true;
}
//add updated item to parents which have been newly added during update
if (hasPlaylistChanged)
{
Playlist.AddToPlaylistTracks(this);
}
if (hasTrackChanged)
{
Track.AddToPlaylistTracks(this);
}
if (isChangeDetected)
{
onUpdated(clone);
if (Key >= 0)
{
DC.Data._PlaylistTracks.ItemHasChanged(clone, this);
}
else if (DC.Data.IsTransaction)
{
DC.Data.AddTransaction(new TransactionItem(3, TransactionActivityEnum.Update, Key, this, oldItem: clone));
}
HasChanged?.Invoke(clone, this);
}
}
