<?php
/**
* Functions and filters related to the menus.
*
* Makes the default WordPress navigation use an HTML structure similar
* to the Navigation block.
*
* @link https://make.wordpress.org/themes/2020/07/06/printing-navigation-block-html-from-a-legacy-menu-in-themes/
*
* @package WordPress
* @subpackage Twenty_Twenty_One
* @since Twenty Twenty-One 1.0
*/
/**
* Add a button to top-level menu items that has sub-menus.
* An icon is added using CSS depending on the value of aria-expanded.
*
* @since Twenty Twenty-One 1.0
*
* @param string $output Nav menu item start element.
* @param object $item Nav menu item.
* @param int $depth Depth.
* @param object $args Nav menu args.
*
* @return string Nav menu item start element.
*/
function twenty_twenty_one_add_sub_menu_toggle( $output, $item, $depth, $args ) {
if ( 0 === $depth && in_array( 'menu-item-has-children', $item->classes, true ) ) {
// Add toggle button.
$output .= '<button class="sub-menu-toggle" aria-expanded="false" onClick="twentytwentyoneExpandSubMenu(this)">';
$output .= '<span class="icon-plus">' . twenty_twenty_one_get_icon_svg( 'ui', 'plus', 18 ) . '</span>';
$output .= '<span class="icon-minus">' . twenty_twenty_one_get_icon_svg( 'ui', 'minus', 18 ) . '</span>';
$output .= '<span class="screen-reader-text">' . esc_html__( 'Open menu', 'twentytwentyone' ) . '</span>';
$output .= '</button>';
}
return $output;
}
add_filter( 'walker_nav_menu_start_el', 'twenty_twenty_one_add_sub_menu_toggle', 10, 4 );
/**
* Detects the social network from a URL and returns the SVG code for its icon.
*
* @since Twenty Twenty-One 1.0
*
* @param string $uri Social link.
* @param int $size The icon size in pixels.
*
* @return string
*/
function twenty_twenty_one_get_social_link_svg( $uri, $size = 24 ) {
return Twenty_Twenty_One_SVG_Icons::get_social_link_svg( $uri, $size );
}
/**
* Displays SVG icons in the footer navigation.
*
* @param string $item_output The menu item's starting HTML output.
* @param WP_Post $item Menu item data object.
* @param int $depth Depth of the menu. Used for padding.
* @param stdClass $args An object of wp_nav_menu() arguments.
* @return string The menu item output with social icon.
*/
function twenty_twenty_one_nav_menu_social_icons( $item_output, $item, $depth, $args ) {
// Change SVG icon inside social links menu if there is supported URL.
if ( 'footer' === $args->theme_location ) {
$svg = twenty_twenty_one_get_social_link_svg( $item->url, 24 );
if ( ! empty( $svg ) ) {
$item_output = str_replace( $args->link_before, $svg, $item_output );
}
}
return $item_output;
}
add_filter( 'walker_nav_menu_start_el', 'twenty_twenty_one_nav_menu_social_icons', 10, 4 );
/**
* Filters the arguments for a single nav menu item.
*
* @since Twenty Twenty-One 1.0
*
* @param stdClass $args An object of wp_nav_menu() arguments.
* @param WP_Post $item Menu item data object.
* @param int $depth Depth of menu item. Used for padding.
*
* @return stdClass
*/
function twenty_twenty_one_add_menu_description_args( $args, $item, $depth ) {
$args->link_after = '';
if ( 0 === $depth && isset( $item->description ) && $item->description ) {
// The extra <span> element is here for styling purposes: Allows the description to not be underlined on hover.
$args->link_after = '<p class="menu-item-description"><span>' . $item->description . '</span></p>';
}
return $args;
}
add_filter( 'nav_menu_item_args', 'twenty_twenty_one_add_menu_description_args', 10, 3 );