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   1  <?php
   2  /**
   3   * SVG icons related functions
   4   *
   5   * @package WordPress
   6   * @subpackage Twenty_Nineteen
   7   * @since Twenty Nineteen 1.0
   8   */
   9  
  10  /**
  11   * Gets the SVG code for a given icon.
  12   */
  13  function twentynineteen_get_icon_svg( $icon, $size = 24 ) {
  14      return TwentyNineteen_SVG_Icons::get_svg( 'ui', $icon, $size );
  15  }
  16  
  17  /**
  18   * Gets the SVG code for a given social icon.
  19   */
  20  function twentynineteen_get_social_icon_svg( $icon, $size = 24 ) {
  21      return TwentyNineteen_SVG_Icons::get_svg( 'social', $icon, $size );
  22  }
  23  
  24  /**
  25   * Detects the social network from a URL and returns the SVG code for its icon.
  26   */
  27  function twentynineteen_get_social_link_svg( $uri, $size = 24 ) {
  28      return TwentyNineteen_SVG_Icons::get_social_link_svg( $uri, $size );
  29  }
  30  
  31  /**
  32   * Display SVG icons in social links menu.
  33   *
  34   * @param string   $item_output The menu item's starting HTML output.
  35   * @param WP_Post  $item        Menu item data object.
  36   * @param int      $depth       Depth of the menu. Used for padding.
  37   * @param stdClass $args        An object of wp_nav_menu() arguments.
  38   * @return string The menu item output with social icon.
  39   */
  40  function twentynineteen_nav_menu_social_icons( $item_output, $item, $depth, $args ) {
  41      // Change SVG icon inside social links menu if there is supported URL.
  42      if ( 'social' === $args->theme_location ) {
  43          $svg = twentynineteen_get_social_link_svg( $item->url, 32 );
  44          if ( empty( $svg ) ) {
  45              $svg = twentynineteen_get_icon_svg( 'link' );
  46          }
  47          $item_output = str_replace( $args->link_after, '</span>' . $svg, $item_output );
  48      }
  49  
  50      return $item_output;
  51  }
  52  add_filter( 'walker_nav_menu_start_el', 'twentynineteen_nav_menu_social_icons', 10, 4 );
  53  
  54  /**
  55   * Add a dropdown icon to top-level menu items.
  56   *
  57   * @param string   $item_output The menu item's starting HTML output.
  58   * @param WP_Post  $item        Menu item data object.
  59   * @param int      $depth       Depth of the menu. Used for padding.
  60   * @param stdClass $args        An object of wp_nav_menu() arguments.
  61   * @return string Nav menu item start element.
  62   */
  63  function twentynineteen_add_dropdown_icons( $item_output, $item, $depth, $args ) {
  64  
  65      // Only add class to 'top level' items on the 'primary' menu.
  66      if ( ! isset( $args->theme_location ) || 'menu-1' !== $args->theme_location ) {
  67          return $item_output;
  68      }
  69  
  70      if ( in_array( 'mobile-parent-nav-menu-item', $item->classes, true ) && isset( $item->original_id ) ) {
  71          // Inject the keyboard_arrow_left SVG inside the parent nav menu item, and let the item link to the parent item.
  72          // @todo Only do this for nested submenus? If on a first-level submenu, then really the link could be "#" since the desire is to remove the target entirely.
  73          $link = sprintf(
  74              '<button class="menu-item-link-return" tabindex="-1">%s',
  75              twentynineteen_get_icon_svg( 'chevron_left', 24 )
  76          );
  77  
  78          // Replace opening <a> with <button>.
  79          $item_output = preg_replace(
  80              '/<a\s.*?>/',
  81              $link,
  82              $item_output,
  83              1 // Limit.
  84          );
  85  
  86          // Replace closing </a> with </button>.
  87          $item_output = preg_replace(
  88              '#</a>#i',
  89              '</button>',
  90              $item_output,
  91              1 // Limit.
  92          );
  93  
  94      } elseif ( in_array( 'menu-item-has-children', $item->classes, true ) ) {
  95  
  96          // Add SVG icon to parent items.
  97          $icon = twentynineteen_get_icon_svg( 'keyboard_arrow_down', 24 );
  98  
  99          $item_output .= sprintf(
 100              '<button class="submenu-expand" tabindex="-1">%s</button>',
 101              $icon
 102          );
 103      }
 104  
 105      return $item_output;
 106  }
 107  add_filter( 'walker_nav_menu_start_el', 'twentynineteen_add_dropdown_icons', 10, 4 );