<?php /** * SVG icons related functions and filters * * @package Radcliffe 2 */ /** * Add SVG definitions to the footer. */ function radcliffe_2_include_svg_icons() { // Define SVG sprite file. $svg_icons = get_parent_theme_file_path( '/assets/images/icons.svg' ); // If it exists, include it. if ( file_exists( $svg_icons ) ) { require_once( $svg_icons ); } } add_action( 'wp_footer', 'radcliffe_2_include_svg_icons', 9999 ); /** * Return SVG markup. * * @param array $args { * Parameters needed to display an SVG. * * @type string $icon Required SVG icon filename. * @type string $title Optional SVG title. * @type string $desc Optional SVG description. * } * @return string SVG markup. */ function radcliffe_2_get_svg( $args = array() ) { $unique_id = null; // Make sure $args are an array. if ( empty( $args ) ) { return esc_html__( 'Please define default parameters in the form of an array.', 'radcliffe-2' ); } // Define an icon. if ( false === array_key_exists( 'icon', $args ) ) { return esc_html__( 'Please define an SVG icon filename.', 'radcliffe-2' ); } // Set defaults. $defaults = array( 'icon' => '', 'title' => '', 'desc' => '', ); // Parse args. $args = wp_parse_args( $args, $defaults ); // Set aria hidden. $aria_hidden = ' aria-hidden="true"'; // Set ARIA. $aria_labelledby = ''; /* * Radcliffe 2 doesn't use the SVG title or description attributes; non-decorative icons are described with .screen-reader-text. * * However, child themes can use the title and description to add information to non-decorative SVG icons to improve accessibility. * * Example 1 with title: <?php echo radcliffe_2_get_svg( array( 'icon' => 'arrow-right', 'title' => esc_html__( 'This is the title', 'textdomain' ) ) ); ?> * * Example 2 with title and description: <?php echo radcliffe_2_get_svg( array( 'icon' => 'arrow-right', 'title' => esc_html__( 'This is the title', 'textdomain' ), 'desc' => esc_html__( 'This is the description', 'textdomain' ) ) ); ?> * * See https://www.paciellogroup.com/blog/2013/12/using-aria-enhance-svg-accessibility/. */ if ( $args['title'] ) { $aria_hidden = ''; $unique_id = uniqid(); $aria_labelledby = ' aria-labelledby="title-' . $unique_id . '"'; if ( $args['desc'] ) { $aria_labelledby = ' aria-labelledby="title-' . $unique_id . ' desc-' . $unique_id . '"'; } } // Begin SVG markup. $svg = '<svg class="icon icon-' . esc_attr( $args['icon'] ) . '"' . $aria_hidden . $aria_labelledby . ' role="img">'; // Display the title. if ( $args['title'] ) { $svg .= '<title id="title-' . $unique_id . '">' . esc_html( $args['title'] ) . '</title>'; // Display the desc only if the title is already set. if ( $args['desc'] ) { $svg .= '<desc id="desc-' . $unique_id . '">' . esc_html( $args['desc'] ) . '</desc>'; } } /* * Display the icon. * * The whitespace around `<use>` is intentional - it is a work around to a keyboard navigation bug in Safari 10. * * See https://core.trac.wordpress.org/ticket/38387. */ $svg .= ' <use href="#icon-' . esc_html( $args['icon'] ) . '" xlink:href="#icon-' . esc_html( $args['icon'] ) . '"></use> '; $svg .= '</svg>'; return $svg; } /** * Add dropdown icon if menu item has children. * * @param string $title The menu item's title. * @param object $item The current menu item. * @param array $args An array of wp_nav_menu() arguments. * @param int $depth Depth of menu item. Used for padding. * @return string $title The menu item's title with dropdown icon. */ function radcliffe_2_dropdown_icon_to_menu_link( $title, $item, $args, $depth ) { if ( 'menu-1' === $args->theme_location ) { foreach ( $item->classes as $value ) { if ( 'menu-item-has-children' === $value || 'page_item_has_children' === $value ) { $title = $title . radcliffe_2_get_svg( array( 'icon' => 'expand' ) ); } } } return $title; } add_filter( 'nav_menu_item_title', 'radcliffe_2_dropdown_icon_to_menu_link', 10, 4 );