Banshee.PlayQueue.PlayQueueSource.EnqueueId C# (CSharp) Method

        private void EnqueueId (int trackId, bool prepend, bool generated)
        {
            if (trackId <= 0) {
                return;
            }

            long view_order;
            if (prepend && current_track != null) {
                // We are going to prepend the track to the play queue, which means
                // adding it after the current_track.
                view_order = CurrentTrackViewOrder;
                if (ServiceManager.PlayerEngine.IsPlaying (current_track)) {
                    view_order++;
                }
            } else {
                if (generated) {
                    // view_order will point after the last track in the queue.
                    view_order = MaxViewOrder;
                }
                else {
                    // view_order will point after the last non-generated track in the queue.
                    view_order = ServiceManager.DbConnection.Query<long> (@"
                        SELECT MAX(ViewOrder) + 1
                        FROM CorePlaylistEntries
                        WHERE PlaylistID = ? AND Generated = 0",
                        DbId
                    );
                }
            }

            // Increment the order of all tracks after view_order
            ServiceManager.DbConnection.Execute (@"
                UPDATE CorePlaylistEntries
                SET ViewOrder = ViewOrder + 1
                WHERE PlaylistID = ? AND ViewOrder >= ?",
                DbId, view_order
            );

            // Add the track to the queue using the view order calculated above.
            ServiceManager.DbConnection.Execute (@"
                INSERT INTO CorePlaylistEntries
                (PlaylistID, TrackID, ViewOrder, Generated)
                VALUES (?, ?, ?, ?)",
                DbId, trackId, view_order, generated ? 1 : 0
            );

            if (!generated) {
                shuffler.RecordShuffleModification (trackId, ShuffleModificationType.Insertion);
            }

            OnTracksAdded ();
            NotifyUser ();
        }