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class-walker-page-dropdown.php (2299B)

      1 <?php
      2 /**
      3  * Post API: Walker_PageDropdown class
      4  *
      5  * @package WordPress
      6  * @subpackage Post
      7  * @since 4.4.0
      8  */
      9 
     10 /**
     11  * Core class used to create an HTML drop-down list of pages.
     12  *
     13  * @since 2.1.0
     14  *
     15  * @see Walker
     16  */
     17 class Walker_PageDropdown extends Walker {
     18 
     19 	/**
     20 	 * What the class handles.
     21 	 *
     22 	 * @since 2.1.0
     23 	 * @var string
     24 	 *
     25 	 * @see Walker::$tree_type
     26 	 */
     27 	public $tree_type = 'page';
     28 
     29 	/**
     30 	 * Database fields to use.
     31 	 *
     32 	 * @since 2.1.0
     33 	 * @var array
     34 	 *
     35 	 * @see Walker::$db_fields
     36 	 * @todo Decouple this
     37 	 */
     38 	public $db_fields = array(
     39 		'parent' => 'post_parent',
     40 		'id'     => 'ID',
     41 	);
     42 
     43 	/**
     44 	 * Starts the element output.
     45 	 *
     46 	 * @since 2.1.0
     47 	 *
     48 	 * @see Walker::start_el()
     49 	 *
     50 	 * @param string  $output Used to append additional content. Passed by reference.
     51 	 * @param WP_Post $page   Page data object.
     52 	 * @param int     $depth  Optional. Depth of page in reference to parent pages. Used for padding.
     53 	 *                        Default 0.
     54 	 * @param array   $args   Optional. Uses 'selected' argument for selected page to set selected HTML
     55 	 *                        attribute for option element. Uses 'value_field' argument to fill "value"
     56 	 *                        attribute. See wp_dropdown_pages(). Default empty array.
     57 	 * @param int     $id     Optional. ID of the current page. Default 0 (unused).
     58 	 */
     59 	public function start_el( &$output, $page, $depth = 0, $args = array(), $id = 0 ) {
     60 		$pad = str_repeat( '&nbsp;', $depth * 3 );
     61 
     62 		if ( ! isset( $args['value_field'] ) || ! isset( $page->{$args['value_field']} ) ) {
     63 			$args['value_field'] = 'ID';
     64 		}
     65 
     66 		$output .= "\t<option class=\"level-$depth\" value=\"" . esc_attr( $page->{$args['value_field']} ) . '"';
     67 		if ( $page->ID == $args['selected'] ) {
     68 			$output .= ' selected="selected"';
     69 		}
     70 		$output .= '>';
     71 
     72 		$title = $page->post_title;
     73 		if ( '' === $title ) {
     74 			/* translators: %d: ID of a post. */
     75 			$title = sprintf( __( '#%d (no title)' ), $page->ID );
     76 		}
     77 
     78 		/**
     79 		 * Filters the page title when creating an HTML drop-down list of pages.
     80 		 *
     81 		 * @since 3.1.0
     82 		 *
     83 		 * @param string  $title Page title.
     84 		 * @param WP_Post $page  Page data object.
     85 		 */
     86 		$title = apply_filters( 'list_pages', $title, $page );
     87 
     88 		$output .= $pad . esc_html( $title );
     89 		$output .= "</option>\n";
     90 	}
     91 }