219 lines
6.9 KiB
PHP
219 lines
6.9 KiB
PHP
<?php
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/**
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* SVG icons related functions and filters
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*
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* @package WordPress
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* @subpackage Twenty_Seventeen
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* @since 1.0
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*/
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/**
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* Add SVG definitions to the footer.
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*/
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function twentyseventeen_include_svg_icons() {
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// Define SVG sprite file.
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$svg_icons = get_parent_theme_file_path( '/assets/images/svg-icons.svg' );
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// If it exists, include it.
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if ( file_exists( $svg_icons ) ) {
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require_once( $svg_icons );
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}
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}
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add_action( 'wp_footer', 'twentyseventeen_include_svg_icons', 9999 );
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/**
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* Return SVG markup.
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*
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* @param array $args {
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* Parameters needed to display an SVG.
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*
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* @type string $icon Required SVG icon filename.
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* @type string $title Optional SVG title.
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* @type string $desc Optional SVG description.
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* }
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* @return string SVG markup.
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*/
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function twentyseventeen_get_svg( $args = array() ) {
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// Make sure $args are an array.
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if ( empty( $args ) ) {
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return __( 'Please define default parameters in the form of an array.', 'twentyseventeen' );
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}
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// Define an icon.
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if ( false === array_key_exists( 'icon', $args ) ) {
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return __( 'Please define an SVG icon filename.', 'twentyseventeen' );
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}
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// Set defaults.
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$defaults = array(
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'icon' => '',
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'title' => '',
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'desc' => '',
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'fallback' => false,
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);
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// Parse args.
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$args = wp_parse_args( $args, $defaults );
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// Set aria hidden.
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$aria_hidden = ' aria-hidden="true"';
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// Set ARIA.
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$aria_labelledby = '';
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/*
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* Twenty Seventeen doesn't use the SVG title or description attributes; non-decorative icons are described with .screen-reader-text.
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*
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* However, child themes can use the title and description to add information to non-decorative SVG icons to improve accessibility.
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*
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* Example 1 with title: <?php echo twentyseventeen_get_svg( array( 'icon' => 'arrow-right', 'title' => __( 'This is the title', 'textdomain' ) ) ); ?>
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*
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* Example 2 with title and description: <?php echo twentyseventeen_get_svg( array( 'icon' => 'arrow-right', 'title' => __( 'This is the title', 'textdomain' ), 'desc' => __( 'This is the description', 'textdomain' ) ) ); ?>
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*
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* See https://www.paciellogroup.com/blog/2013/12/using-aria-enhance-svg-accessibility/.
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*/
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if ( $args['title'] ) {
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$aria_hidden = '';
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$unique_id = uniqid();
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$aria_labelledby = ' aria-labelledby="title-' . $unique_id . '"';
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if ( $args['desc'] ) {
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$aria_labelledby = ' aria-labelledby="title-' . $unique_id . ' desc-' . $unique_id . '"';
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}
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}
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// Begin SVG markup.
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$svg = '<svg class="icon icon-' . esc_attr( $args['icon'] ) . '"' . $aria_hidden . $aria_labelledby . ' role="img">';
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// Display the title.
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if ( $args['title'] ) {
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$svg .= '<title id="title-' . $unique_id . '">' . esc_html( $args['title'] ) . '</title>';
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// Display the desc only if the title is already set.
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if ( $args['desc'] ) {
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$svg .= '<desc id="desc-' . $unique_id . '">' . esc_html( $args['desc'] ) . '</desc>';
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}
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}
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/*
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* Display the icon.
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*
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* The whitespace around `<use>` is intentional - it is a work around to a keyboard navigation bug in Safari 10.
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*
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* See https://core.trac.wordpress.org/ticket/38387.
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*/
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$svg .= ' <use href="#icon-' . esc_html( $args['icon'] ) . '" xlink:href="#icon-' . esc_html( $args['icon'] ) . '"></use> ';
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// Add some markup to use as a fallback for browsers that do not support SVGs.
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if ( $args['fallback'] ) {
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$svg .= '<span class="svg-fallback icon-' . esc_attr( $args['icon'] ) . '"></span>';
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}
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$svg .= '</svg>';
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return $svg;
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}
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/**
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* Display SVG icons in social links menu.
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*
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* @param string $item_output The menu item output.
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* @param WP_Post $item Menu item object.
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* @param int $depth Depth of the menu.
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* @param array $args wp_nav_menu() arguments.
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* @return string $item_output The menu item output with social icon.
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*/
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function twentyseventeen_nav_menu_social_icons( $item_output, $item, $depth, $args ) {
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// Get supported social icons.
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$social_icons = twentyseventeen_social_links_icons();
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// Change SVG icon inside social links menu if there is supported URL.
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if ( 'social' === $args->theme_location ) {
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foreach ( $social_icons as $attr => $value ) {
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if ( false !== strpos( $item_output, $attr ) ) {
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$item_output = str_replace( $args->link_after, '</span>' . twentyseventeen_get_svg( array( 'icon' => esc_attr( $value ) ) ), $item_output );
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}
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}
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}
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return $item_output;
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}
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add_filter( 'walker_nav_menu_start_el', 'twentyseventeen_nav_menu_social_icons', 10, 4 );
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/**
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* Add dropdown icon if menu item has children.
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*
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* @param string $title The menu item's title.
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* @param object $item The current menu item.
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* @param array $args An array of wp_nav_menu() arguments.
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* @param int $depth Depth of menu item. Used for padding.
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* @return string $title The menu item's title with dropdown icon.
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*/
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function twentyseventeen_dropdown_icon_to_menu_link( $title, $item, $args, $depth ) {
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if ( 'top' === $args->theme_location ) {
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foreach ( $item->classes as $value ) {
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if ( 'menu-item-has-children' === $value || 'page_item_has_children' === $value ) {
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$title = $title . twentyseventeen_get_svg( array( 'icon' => 'angle-down' ) );
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}
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}
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}
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return $title;
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}
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add_filter( 'nav_menu_item_title', 'twentyseventeen_dropdown_icon_to_menu_link', 10, 4 );
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/**
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* Returns an array of supported social links (URL and icon name).
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*
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* @return array $social_links_icons
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*/
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function twentyseventeen_social_links_icons() {
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// Supported social links icons.
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$social_links_icons = array(
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'behance.net' => 'behance',
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'codepen.io' => 'codepen',
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'deviantart.com' => 'deviantart',
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'digg.com' => 'digg',
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'dribbble.com' => 'dribbble',
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'dropbox.com' => 'dropbox',
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'facebook.com' => 'facebook',
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'flickr.com' => 'flickr',
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'foursquare.com' => 'foursquare',
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'plus.google.com' => 'google-plus',
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'github.com' => 'github',
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'instagram.com' => 'instagram',
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'linkedin.com' => 'linkedin',
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'mailto:' => 'envelope-o',
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'medium.com' => 'medium',
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'pinterest.com' => 'pinterest-p',
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'getpocket.com' => 'get-pocket',
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'reddit.com' => 'reddit-alien',
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'skype.com' => 'skype',
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'skype:' => 'skype',
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'slideshare.net' => 'slideshare',
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'snapchat.com' => 'snapchat-ghost',
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'soundcloud.com' => 'soundcloud',
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'spotify.com' => 'spotify',
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'stumbleupon.com' => 'stumbleupon',
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'tumblr.com' => 'tumblr',
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'twitch.tv' => 'twitch',
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'twitter.com' => 'twitter',
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'vimeo.com' => 'vimeo',
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'vine.co' => 'vine',
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'vk.com' => 'vk',
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'wordpress.org' => 'wordpress',
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'wordpress.com' => 'wordpress',
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'yelp.com' => 'yelp',
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'youtube.com' => 'youtube',
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);
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/**
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* Filter Twenty Seventeen social links icons.
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*
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* @since Twenty Seventeen 1.0
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*
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* @param array $social_links_icons Array of social links icons.
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*/
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return apply_filters( 'twentyseventeen_social_links_icons', $social_links_icons );
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}
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