Banshee.Gui.TrackActions.UpdateActions C# (CSharp) Method

        public void UpdateActions ()
        {
            Source source = ServiceManager.SourceManager.ActiveSource;
            if (source == null) {
                Sensitive = Visible = false;
                return;
            }

            bool in_database = source is DatabaseSource;
            PrimarySource primary_source = (source as PrimarySource) ?? (source.Parent as PrimarySource);

            var track_source = source as ITrackModelSource;
            if (track_source != null) {
                if (FilterFocused) {
                    if (Selection == filter_selection) {
                        filter_selection.MaxIndex = track_source.TrackModel.Selection.MaxIndex;
                        filter_selection.Clear (false);
                        filter_selection.SelectAll ();
                    } else {
                        Log.Error ("Filter focused, but selection is not filter selection!");
                        Console.WriteLine (System.Environment.StackTrace);
                    }
                }

                var selection = Selection;
                int count = selection.Count;
                Sensitive = Visible = true;
                bool has_selection = count > 0;
                bool has_single_selection = count == 1;

                foreach (string action in require_selection_actions) {
                    this[action].Sensitive = has_selection;
                }

                UpdateActions (source.CanSearch && !FilterFocused, has_single_selection,
                   "SearchMenuAction", "SearchForSameArtistAction", "SearchForSameAlbumAction"
                );

                this["SelectAllAction"].Sensitive = track_source.Count > 0 && !selection.AllSelected;
                UpdateAction ("RemoveTracksAction", track_source.CanRemoveTracks, has_selection, source);
                UpdateAction ("DeleteTracksFromDriveAction", track_source.CanDeleteTracks, has_selection, source);

                //if it can delete tracks, most likely it can open their folder
                UpdateAction ("OpenContainingFolderAction", track_source.CanDeleteTracks, has_single_selection, source);

                UpdateAction ("RemoveTracksFromLibraryAction", source.Parent is LibrarySource, has_selection, null);

                UpdateAction ("TrackPropertiesAction", source.HasViewableTrackProperties, has_selection, source);
                UpdateAction ("TrackEditorAction", source.HasEditableTrackProperties, has_selection, source);
                UpdateAction ("RateTracksAction", source.HasEditableTrackProperties, has_selection, null);
                UpdateAction ("AddToPlaylistAction", in_database && primary_source != null &&
                        primary_source.SupportsPlaylists && !primary_source.PlaylistsReadOnly, has_selection, null);

                if (primary_source != null &&
                    !(primary_source is LibrarySource) &&
                    primary_source.StorageName != null) {
                    this["DeleteTracksFromDriveAction"].Label = String.Format (
                        Catalog.GetString ("_Delete From \"{0}\""), primary_source.StorageName);
                }

                if (FilterFocused) {
                    UpdateActions (false, false, disable_for_filter_actions);
                }
            } else {
                Sensitive = Visible = false;
            }
        }