public function get_files( $type = null, $depth = 0, $search_parent = false ) {
		// get and cache all theme files to start with.
		$label = sanitize_key( 'files_' . $this->cache_hash . '-' . $this->get( 'Version' ) );
		$transient_key = substr( $label, 0, 29 ) . md5( $label );

		$all_files = get_transient( $transient_key );
		if ( false === $all_files ) {
			$all_files = (array) self::scandir( $this->get_stylesheet_directory(), null, -1 );

			if ( $search_parent && $this->parent() ) {
				$all_files += (array) self::scandir( $this->get_template_directory(), null, -1 );
			}

			set_transient( $transient_key, $all_files, HOUR_IN_SECONDS );
		}

		// Filter $all_files by $type & $depth.
		$files = array();
		if ( $type ) {
			$type = (array) $type;
			$_extensions = implode( '|', $type );
		}
		foreach ( $all_files as $key => $file ) {
			if ( $depth >= 0 && substr_count( $key, '/' ) > $depth ) {
				continue; // Filter by depth.
			}
			if ( ! $type || preg_match( '~\.(' . $_extensions . ')$~', $file ) ) { // Filter by type.
				$files[ $key ] = $file;
			}
		}

		return $files;
	}