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   1  <?php
   2  /**
   3   * Functions and filters related to the menus.
   4   *
   5   * Makes the default WordPress navigation use an HTML structure similar
   6   * to the Navigation block.
   7   *
   8   * @link https://make.wordpress.org/themes/2020/07/06/printing-navigation-block-html-from-a-legacy-menu-in-themes/
   9   *
  10   * @package WordPress
  11   * @subpackage Twenty_Twenty_One
  12   * @since Twenty Twenty-One 1.0
  13   */
  14  
  15  /**
  16   * Add a button to top-level menu items that has sub-menus.
  17   * An icon is added using CSS depending on the value of aria-expanded.
  18   *
  19   * @since Twenty Twenty-One 1.0
  20   *
  21   * @param string $output Nav menu item start element.
  22   * @param object $item   Nav menu item.
  23   * @param int    $depth  Depth.
  24   * @param object $args   Nav menu args.
  25   * @return string Nav menu item start element.
  26   */
  27  function twenty_twenty_one_add_sub_menu_toggle( $output, $item, $depth, $args ) {
  28      if ( 0 === $depth && in_array( 'menu-item-has-children', $item->classes, true ) ) {
  29  
  30          // Add toggle button.
  31          $output .= '<button class="sub-menu-toggle" aria-expanded="false" onClick="twentytwentyoneExpandSubMenu(this)">';
  32          $output .= '<span class="icon-plus">' . twenty_twenty_one_get_icon_svg( 'ui', 'plus', 18 ) . '</span>';
  33          $output .= '<span class="icon-minus">' . twenty_twenty_one_get_icon_svg( 'ui', 'minus', 18 ) . '</span>';
  34          $output .= '<span class="screen-reader-text">' . esc_html__( 'Open menu', 'twentytwentyone' ) . '</span>';
  35          $output .= '</button>';
  36      }
  37      return $output;
  38  }
  39  add_filter( 'walker_nav_menu_start_el', 'twenty_twenty_one_add_sub_menu_toggle', 10, 4 );
  40  
  41  /**
  42   * Detects the social network from a URL and returns the SVG code for its icon.
  43   *
  44   * @since Twenty Twenty-One 1.0
  45   *
  46   * @param string $uri  Social link.
  47   * @param int    $size The icon size in pixels.
  48   * @return string
  49   */
  50  function twenty_twenty_one_get_social_link_svg( $uri, $size = 24 ) {
  51      return Twenty_Twenty_One_SVG_Icons::get_social_link_svg( $uri, $size );
  52  }
  53  
  54  /**
  55   * Displays SVG icons in the footer navigation.
  56   *
  57   * @since Twenty Twenty-One 1.0
  58   *
  59   * @param string   $item_output The menu item's starting HTML output.
  60   * @param WP_Post  $item        Menu item data object.
  61   * @param int      $depth       Depth of the menu. Used for padding.
  62   * @param stdClass $args        An object of wp_nav_menu() arguments.
  63   * @return string The menu item output with social icon.
  64   */
  65  function twenty_twenty_one_nav_menu_social_icons( $item_output, $item, $depth, $args ) {
  66      // Change SVG icon inside social links menu if there is supported URL.
  67      if ( 'footer' === $args->theme_location ) {
  68          $svg = twenty_twenty_one_get_social_link_svg( $item->url, 24 );
  69          if ( ! empty( $svg ) ) {
  70              $item_output = str_replace( $args->link_before, $svg, $item_output );
  71          }
  72      }
  73  
  74      return $item_output;
  75  }
  76  
  77  add_filter( 'walker_nav_menu_start_el', 'twenty_twenty_one_nav_menu_social_icons', 10, 4 );
  78  
  79  /**
  80   * Filters the arguments for a single nav menu item.
  81   *
  82   * @since Twenty Twenty-One 1.0
  83   *
  84   * @param stdClass $args  An object of wp_nav_menu() arguments.
  85   * @param WP_Post  $item  Menu item data object.
  86   * @param int      $depth Depth of menu item. Used for padding.
  87   * @return stdClass
  88   */
  89  function twenty_twenty_one_add_menu_description_args( $args, $item, $depth ) {
  90      if ( '</span>' !== $args->link_after ) {
  91          $args->link_after = '';
  92      }
  93  
  94      if ( 0 === $depth && isset( $item->description ) && $item->description ) {
  95          // The extra <span> element is here for styling purposes: Allows the description to not be underlined on hover.
  96          $args->link_after = '<p class="menu-item-description"><span>' . $item->description . '</span></p>';
  97      }
  98  
  99      return $args;
 100  }
 101  add_filter( 'nav_menu_item_args', 'twenty_twenty_one_add_menu_description_args', 10, 3 );