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

        public void Shuffle ()
        {
            if (!Populate) {
                if (current_track == null)
                    return;

                int enabled_count = EnabledCount;
                int first_view_order = (int)CurrentTrackViewOrder;
                int last_view_order = first_view_order + enabled_count;

                // If the current track is playing, don't shuffle it
                if (ServiceManager.PlayerEngine.IsPlaying (current_track))
                    first_view_order++;

                // Nothing to do if less than 2 tracks
                if (last_view_order - first_view_order < 2)
                    return;

                // Save the current_track index, so we can update the current track
                // to be whatever one is at that position after we shuffle them -- assuming
                // the current_track isn't already playing.
                int current_index = TrackModel.IndexOf (current_track);

                // Setup a function that will return a random ViewOrder in the range we want
                var rand = new Random ();
                var func_id = "play-queue-shuffle-order-" + rand.NextDouble ().ToString ();
                var view_orders = Enumerable.Range (first_view_order, last_view_order)
                                            .OrderBy (a => rand.NextDouble ())
                                            .ToList ();
                int i = 0;
                BinaryFunction.Add (func_id, (f, b) => view_orders[i++]);

                ServiceManager.DbConnection.Execute (
                    "UPDATE CorePlaylistEntries SET ViewOrder = HYENA_BINARY_FUNCTION (?, NULL, NULL) WHERE PlaylistID = ? AND ViewOrder >= ?",
                    func_id, DbId, first_view_order
                );

                BinaryFunction.Remove (func_id);
                Reload ();

                // Update the current track unless it was playing (and therefore wasn't moved)
                if (!ServiceManager.PlayerEngine.IsPlaying (current_track)) {
                    SetCurrentTrack (TrackModel[current_index] as DatabaseTrackInfo);
                }
            }
        }

 private void OnShufflePlayQueue(object o, EventArgs args)
 {
     playqueue.Shuffle();
 }