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   1  <?php
   2  /**
   3   * Custom page walker for this theme.
   4   *
   5   * @package WordPress
   6   * @subpackage Twenty_Twenty
   7   * @since 1.0.0
   8   */
   9  
  10  if ( ! class_exists( 'TwentyTwenty_Walker_Page' ) ) {
  11      /**
  12       * CUSTOM PAGE WALKER
  13       * A custom walker for pages.
  14       */
  15      class TwentyTwenty_Walker_Page extends Walker_Page {
  16  
  17          /**
  18           * Outputs the beginning of the current element in the tree.
  19           *
  20           * @see Walker::start_el()
  21           * @since 2.1.0
  22           *
  23           * @param string  $output       Used to append additional content. Passed by reference.
  24           * @param WP_Post $page         Page data object.
  25           * @param int     $depth        Optional. Depth of page. Used for padding. Default 0.
  26           * @param array   $args         Optional. Array of arguments. Default empty array.
  27           * @param int     $current_page Optional. Page ID. Default 0.
  28           */
  29  		public function start_el( &$output, $page, $depth = 0, $args = array(), $current_page = 0 ) {
  30  
  31              if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) {
  32                  $t = "\t";
  33                  $n = "\n";
  34              } else {
  35                  $t = '';
  36                  $n = '';
  37              }
  38              if ( $depth ) {
  39                  $indent = str_repeat( $t, $depth );
  40              } else {
  41                  $indent = '';
  42              }
  43  
  44              $css_class = array( 'page_item', 'page-item-' . $page->ID );
  45  
  46              if ( isset( $args['pages_with_children'][ $page->ID ] ) ) {
  47                  $css_class[] = 'page_item_has_children';
  48              }
  49  
  50              if ( ! empty( $current_page ) ) {
  51                  $_current_page = get_post( $current_page );
  52                  if ( $_current_page && in_array( $page->ID, $_current_page->ancestors, true ) ) {
  53                      $css_class[] = 'current_page_ancestor';
  54                  }
  55                  if ( $page->ID === $current_page ) {
  56                      $css_class[] = 'current_page_item';
  57                  } elseif ( $_current_page && $page->ID === $_current_page->post_parent ) {
  58                      $css_class[] = 'current_page_parent';
  59                  }
  60              } elseif ( get_option( 'page_for_posts' ) === $page->ID ) {
  61                  $css_class[] = 'current_page_parent';
  62              }
  63  
  64              /**
  65               * Filters the list of CSS classes to include with each page item in the list.
  66               *
  67               * @since 2.8.0
  68               *
  69               * @see wp_list_pages()
  70               *
  71               * @param string[] $css_class    An array of CSS classes to be applied to each list item.
  72               * @param WP_Post  $page         Page data object.
  73               * @param int      $depth        Depth of page, used for padding.
  74               * @param array    $args         An array of arguments.
  75               * @param int      $current_page ID of the current page.
  76               */
  77              $css_classes = implode( ' ', apply_filters( 'page_css_class', $css_class, $page, $depth, $args, $current_page ) );
  78              $css_classes = $css_classes ? ' class="' . esc_attr( $css_classes ) . '"' : '';
  79  
  80              if ( '' === $page->post_title ) {
  81                  /* translators: %d: ID of a post */
  82                  $page->post_title = sprintf( __( '#%d (no title)', 'twentytwenty' ), $page->ID );
  83              }
  84  
  85              $args['link_before'] = empty( $args['link_before'] ) ? '' : $args['link_before'];
  86              $args['link_after']  = empty( $args['link_after'] ) ? '' : $args['link_after'];
  87  
  88              $atts                 = array();
  89              $atts['href']         = get_permalink( $page->ID );
  90              $atts['aria-current'] = ( $page->ID === $current_page ) ? 'page' : '';
  91  
  92              /**
  93               * Filters the HTML attributes applied to a page menu item's anchor element.
  94               *
  95               * @since 4.8.0
  96               *
  97               * @param array $atts {
  98               *     The HTML attributes applied to the menu item's `<a>` element, empty strings are ignored.
  99               *
 100               *     @type string $href         The href attribute.
 101               *     @type string $aria_current The aria-current attribute.
 102               * }
 103               * @param WP_Post $page         Page data object.
 104               * @param int     $depth        Depth of page, used for padding.
 105               * @param array   $args         An array of arguments.
 106               * @param int     $current_page ID of the current page.
 107               */
 108              $atts = apply_filters( 'page_menu_link_attributes', $atts, $page, $depth, $args, $current_page );
 109  
 110              $attributes = '';
 111              foreach ( $atts as $attr => $value ) {
 112                  if ( ! empty( $value ) ) {
 113                      $value       = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
 114                      $attributes .= ' ' . $attr . '="' . $value . '"';
 115                  }
 116              }
 117  
 118              $args['list_item_before'] = '';
 119              $args['list_item_after']  = '';
 120  
 121              // Wrap the link in a div and append a sub menu toggle.
 122              if ( isset( $args['show_toggles'] ) && true === $args['show_toggles'] ) {
 123                  // Wrap the menu item link contents in a div, used for positioning.
 124                  $args['list_item_before'] = '<div class="ancestor-wrapper">';
 125                  $args['list_item_after']  = '';
 126  
 127                  // Add a toggle to items with children.
 128                  if ( isset( $args['pages_with_children'][ $page->ID ] ) ) {
 129  
 130                      $toggle_target_string = '.menu-modal .page-item-' . $page->ID . ' > ul';
 131                      $toggle_duration      = twentytwenty_toggle_duration();
 132  
 133                      // Add the sub menu toggle.
 134                      $args['list_item_after'] .= '<button class="toggle sub-menu-toggle fill-children-current-color" data-toggle-target="' . $toggle_target_string . '" data-toggle-type="slidetoggle" data-toggle-duration="' . absint( $toggle_duration ) . '" aria-expanded="false"><span class="screen-reader-text">' . __( 'Show sub menu', 'twentytwenty' ) . '</span>' . twentytwenty_get_theme_svg( 'chevron-down' ) . '</button>';
 135  
 136                  }
 137  
 138                  // Close the wrapper.
 139                  $args['list_item_after'] .= '</div><!-- .ancestor-wrapper -->';
 140              }
 141  
 142              // Add icons to menu items with children.
 143              if ( isset( $args['show_sub_menu_icons'] ) && true === $args['show_sub_menu_icons'] ) {
 144                  if ( isset( $args['pages_with_children'][ $page->ID ] ) ) {
 145                      $args['list_item_after'] = '<span class="icon"></span>';
 146                  }
 147              }
 148  
 149              $output .= $indent . sprintf(
 150                  '<li%s>%s<a%s>%s%s%s</a>%s',
 151                  $css_classes,
 152                  $args['list_item_before'],
 153                  $attributes,
 154                  $args['link_before'],
 155                  /** This filter is documented in wp-includes/post-template.php */
 156                  apply_filters( 'the_title', $page->post_title, $page->ID ),
 157                  $args['link_after'],
 158                  $args['list_item_after']
 159              );
 160  
 161              if ( ! empty( $args['show_date'] ) ) {
 162                  if ( 'modified' === $args['show_date'] ) {
 163                      $time = $page->post_modified;
 164                  } else {
 165                      $time = $page->post_date;
 166                  }
 167  
 168                  $date_format = empty( $args['date_format'] ) ? '' : $args['date_format'];
 169                  $output     .= ' ' . mysql2date( $date_format, $time );
 170              }
 171          }
 172      }
 173  }