wp/wp-includes/class-walker-page-dropdown.php
changeset 7 cf61fcea0001
child 9 177826044cd9
equal deleted inserted replaced
6:490d5cc509ed 7:cf61fcea0001
       
     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( 'parent' => 'post_parent', 'id' => 'ID' );
       
    39 
       
    40 	/**
       
    41 	 * Starts the element output.
       
    42 	 *
       
    43 	 * @since 2.1.0
       
    44 	 *
       
    45 	 * @see Walker::start_el()
       
    46 	 *
       
    47 	 * @param string  $output Used to append additional content. Passed by reference.
       
    48 	 * @param WP_Post $page   Page data object.
       
    49 	 * @param int     $depth  Optional. Depth of page in reference to parent pages. Used for padding.
       
    50 	 *                        Default 0.
       
    51 	 * @param array   $args   Optional. Uses 'selected' argument for selected page to set selected HTML
       
    52 	 *                        attribute for option element. Uses 'value_field' argument to fill "value"
       
    53 	 *                        attribute. See wp_dropdown_pages(). Default empty array.
       
    54 	 * @param int     $id     Optional. ID of the current page. Default 0 (unused).
       
    55 	 */
       
    56 	public function start_el( &$output, $page, $depth = 0, $args = array(), $id = 0 ) {
       
    57 		$pad = str_repeat('&nbsp;', $depth * 3);
       
    58 
       
    59 		if ( ! isset( $args['value_field'] ) || ! isset( $page->{$args['value_field']} ) ) {
       
    60 			$args['value_field'] = 'ID';
       
    61 		}
       
    62 
       
    63 		$output .= "\t<option class=\"level-$depth\" value=\"" . esc_attr( $page->{$args['value_field']} ) . "\"";
       
    64 		if ( $page->ID == $args['selected'] )
       
    65 			$output .= ' selected="selected"';
       
    66 		$output .= '>';
       
    67 
       
    68 		$title = $page->post_title;
       
    69 		if ( '' === $title ) {
       
    70 			/* translators: %d: ID of a post */
       
    71 			$title = sprintf( __( '#%d (no title)' ), $page->ID );
       
    72 		}
       
    73 
       
    74 		/**
       
    75 		 * Filters the page title when creating an HTML drop-down list of pages.
       
    76 		 *
       
    77 		 * @since 3.1.0
       
    78 		 *
       
    79 		 * @param string $title Page title.
       
    80 		 * @param object $page  Page data object.
       
    81 		 */
       
    82 		$title = apply_filters( 'list_pages', $title, $page );
       
    83 
       
    84 		$output .= $pad . esc_html( $title );
       
    85 		$output .= "</option>\n";
       
    86 	}
       
    87 }