private function setup_actions() {

		// Messages
		add_filter( 'post_updated_messages', array( $this, 'updated_messages' ) );

		// Topic bulk actions, added in WordPress 4.7, see #WP16031.
		if ( bbp_get_major_wp_version() >= 4.7 ) {
			add_filter( 'bulk_actions-edit-topic',        array( $this, 'bulk_actions' ) );
			add_filter( 'handle_bulk_actions-edit-topic', array( $this, 'handle_bulk_actions' ), 10, 3 );
			add_filter( 'bulk_post_updated_messages',     array( $this, 'bulk_post_updated_messages' ), 10, 2 );
		}

		// Topic column headers.
		add_filter( 'manage_' . $this->post_type . '_posts_columns',        array( $this, 'column_headers' ) );

		// Topic columns (in post row)
		add_action( 'manage_' . $this->post_type . '_posts_custom_column',  array( $this, 'column_data' ), 10, 2 );
		add_filter( 'post_row_actions',                                     array( $this, 'row_actions' ), 10, 2 );

		// Topic meta-box actions
		add_action( 'add_meta_boxes', array( $this, 'attributes_metabox'    ) );
		add_action( 'add_meta_boxes', array( $this, 'author_metabox'        ) );
		add_action( 'add_meta_boxes', array( $this, 'replies_metabox'       ) );
		add_action( 'add_meta_boxes', array( $this, 'engagements_metabox'   ) );
		add_action( 'add_meta_boxes', array( $this, 'favorites_metabox'     ) );
		add_action( 'add_meta_boxes', array( $this, 'subscriptions_metabox' ) );
		add_action( 'add_meta_boxes', array( $this, 'comments_metabox'      ) );
		add_action( 'save_post',      array( $this, 'save_meta_boxes'       ) );

		// Check if there are any bbp_toggle_topic_* requests on admin_init, also have a message displayed
		add_action( 'load-edit.php',  array( $this, 'toggle_topic'        ) );
		add_action( 'load-edit.php',  array( $this, 'toggle_topic_notice' ) );

		// Add ability to filter topics and replies per forum
		add_filter( 'restrict_manage_posts', array( $this, 'filter_dropdown'  ) );
		add_filter( 'bbp_request',           array( $this, 'filter_post_rows' ) );

		// Empty spam
		add_filter( 'manage_posts_extra_tablenav', array( $this, 'filter_empty_spam' ) );

		// Contextual Help
		add_action( 'load-edit.php',     array( $this, 'edit_help' ) );
		add_action( 'load-post.php',     array( $this, 'new_help'  ) );
		add_action( 'load-post-new.php', array( $this, 'new_help'  ) );
	}