public function define_trigger() {



		$all_post_types = Automator()->helpers->recipe->wp->options->all_post_types(
			null,
			'WPPOSTTYPES',
			array(
				'token'        => false,
				'is_ajax'      => true,
				'target_field' => 'WPTAXONOMIES',
				'endpoint'     => 'select_post_type_taxonomies',
			)
		);

		// now get regular post types.
		$args = array(
			'public'   => true,
			'_builtin' => true,
		);

		$options      = array();
		$options['0'] = __( 'Any post type', 'uncanny-automator' );
		$post_types   = get_post_types( $args, 'object' );
		if ( ! empty( $post_types ) ) {
			foreach ( $post_types as $post_type ) {
				$options[ $post_type->name ] = esc_html( $post_type->labels->singular_name );
			}
		}
		$options                   = array_merge( $options, $all_post_types['options'] );
		$all_post_types['options'] = $options;

		$relevant_tokens = array(
			'POSTTITLE'   => __( 'Post title', 'uncanny-automator' ),
			'POSTID'      => __( 'Post ID', 'uncanny-automator' ),
			'POSTURL'     => __( 'Post URL', 'uncanny-automator' ),
			'POSTCONTENT' => __( 'Post content', 'uncanny-automator' ),
		);

		$trigger = array(
			'author'              => Automator()->get_author_name( $this->trigger_code ),
			'support_link'        => Automator()->get_author_support_link( $this->trigger_code, 'integration/wordpress-core/' ),
			'integration'         => self::$integration,
			'code'                => $this->trigger_code,
			'sentence'            => sprintf(
				/* translators: Logged-in trigger - WordPress */
				__( 'A user publishes a {{type of:%1$s}} post with {{a taxonomy term:%2$s}} in {{a taxonomy:%3$s}}', 'uncanny-automator' ),
				$this->trigger_meta,
				'WPTAXONOMYTERM' . ':' . $this->trigger_meta,
				'WPTAXONOMIES' . ':' . $this->trigger_meta
			),
			/* translators: Logged-in trigger - WordPress */
			'select_option_name'  => esc_attr__( 'A user publishes a {{type of}} post with {{a taxonomy term}} in {{a taxonomy}}', 'uncanny-automator' ),
			'action'              => 'transition_post_status',
			'priority'            => 90,
			'accepted_args'       => 3,
			'validation_function' => array( $this, 'post_published' ),
			'options'             => array(),
			'options_group'       => array(
				$this->trigger_meta => array(
					$all_post_types,
					/* translators: Noun */
					Automator()->helpers->recipe->field->select_field_ajax(
						'WPTAXONOMIES',
						esc_attr__( 'Taxonomy', 'uncanny-automator' ),
						array(),
						'',
						'',
						false,
						true,
						array(
							'target_field' => 'WPTAXONOMYTERM',
							'endpoint'     => 'select_terms_for_selected_taxonomy',
						),
						$relevant_tokens
					),
					Automator()->helpers->recipe->field->select_field( 'WPTAXONOMYTERM', esc_attr__( 'Taxonomy term', 'uncanny-automator' ) ),
				),
			),
		);

		Automator()->register->trigger( $trigger );

		return;
	}