319 lines
12 KiB
PHP
319 lines
12 KiB
PHP
<?php
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declare(strict_types=1);
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/**
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* Handle the lazyload required assets: inline CSS and JS
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*
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* @package WP_Rocket\Dependencies\RocketLazyload
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*/
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namespace WP_Rocket\Dependencies\RocketLazyload;
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/**
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* Class containing the methods to return or print the assets needed for lazyloading
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*/
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class Assets {
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/**
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* Inserts the lazyload script in the HTML
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*
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* @param array $args Array of arguments to populate the lazyload script tag.
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* @return void
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*/
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public function insertLazyloadScript( $args = [] ) {
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echo $this->getLazyloadScript( $args ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
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}
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/**
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* Gets the inline lazyload script configuration
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*
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* @param array $args Array of arguments to populate the lazyload script options.
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* @return string
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*/
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public function getInlineLazyloadScript( $args = [] ) {
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$defaults = [
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'elements' => [
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'iframe',
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],
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'threshold' => 300,
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'options' => [],
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];
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$allowed_options = [
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'container' => 1,
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'thresholds' => 1,
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'data_bg' => 1,
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'data_bg_hidpi' => 1,
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'data_bg_multi' => 1,
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'data_bg_multi_hidpi' => 1,
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'data_poster' => 1,
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'class_applied' => 1,
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'class_error' => 1,
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'class_entered' => 1,
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'class_exited' => 1,
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'cancel_on_exit' => 1,
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'unobserve_entered' => 1,
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'unobserve_completed' => 1,
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'callback_enter' => 1,
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'callback_exit' => 1,
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'callback_loading' => 1,
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'callback_cancel' => 1,
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'callback_loaded' => 1,
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'callback_error' => 1,
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'callback_applied' => 1,
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'callback_finish' => 1,
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'use_native' => 1,
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];
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$args = wp_parse_args( $args, $defaults );
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$script = '';
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$args['options'] = array_intersect_key( $args['options'], $allowed_options );
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$script .= 'window.lazyLoadOptions = ';
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if ( isset( $args['elements']['background_image'] ) ) {
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$script .= '[';
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}
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$script .= '{
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elements_selector: "' . esc_attr( implode( ',', $args['elements'] ) ) . '",
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data_src: "lazy-src",
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data_srcset: "lazy-srcset",
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data_sizes: "lazy-sizes",
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class_loading: "lazyloading",
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class_loaded: "lazyloaded",
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threshold: ' . esc_attr( $args['threshold'] ) . ',
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callback_loaded: function(element) {
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if ( element.tagName === "IFRAME" && element.dataset.rocketLazyload == "fitvidscompatible" ) {
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if (element.classList.contains("lazyloaded") ) {
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if (typeof window.jQuery != "undefined") {
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if (jQuery.fn.fitVids) {
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jQuery(element).parent().fitVids();
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}
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}
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}
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}
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}';
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if ( ! empty( $args['options'] ) ) {
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$script .= ',' . PHP_EOL;
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foreach ( $args['options'] as $option => $value ) {
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$script .= $option . ': ' . $value . ',';
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}
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$script = rtrim( $script, ',' );
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}
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if ( isset( $args['elements']['background_image'] ) ) {
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$script .= '},{
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elements_selector: "' . esc_attr( $args['elements']['background_image'] ) . '",
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data_src: "lazy-src",
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data_srcset: "lazy-srcset",
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data_sizes: "lazy-sizes",
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class_loading: "lazyloading",
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class_loaded: "lazyloaded",
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threshold: ' . esc_attr( $args['threshold'] ) . ',
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}];';
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} else {
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$script .= '};';
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}
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$script .= '
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window.addEventListener(\'LazyLoad::Initialized\', function (e) {
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var lazyLoadInstance = e.detail.instance;
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if (window.MutationObserver) {
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var observer = new MutationObserver(function(mutations) {
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var image_count = 0;
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var iframe_count = 0;
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var rocketlazy_count = 0;
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mutations.forEach(function(mutation) {
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for (var i = 0; i < mutation.addedNodes.length; i++) {
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if (typeof mutation.addedNodes[i].getElementsByTagName !== \'function\') {
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continue;
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}
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if (typeof mutation.addedNodes[i].getElementsByClassName !== \'function\') {
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continue;
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}
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images = mutation.addedNodes[i].getElementsByTagName(\'img\');
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is_image = mutation.addedNodes[i].tagName == "IMG";
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iframes = mutation.addedNodes[i].getElementsByTagName(\'iframe\');
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is_iframe = mutation.addedNodes[i].tagName == "IFRAME";
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rocket_lazy = mutation.addedNodes[i].getElementsByClassName(\'rocket-lazyload\');
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image_count += images.length;
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iframe_count += iframes.length;
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rocketlazy_count += rocket_lazy.length;
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if(is_image){
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image_count += 1;
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}
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if(is_iframe){
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iframe_count += 1;
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}
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}
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} );
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if(image_count > 0 || iframe_count > 0 || rocketlazy_count > 0){
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lazyLoadInstance.update();
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}
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} );
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var b = document.getElementsByTagName("body")[0];
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var config = { childList: true, subtree: true };
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observer.observe(b, config);
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}
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}, false);';
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return $script;
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}
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/**
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* Returns the lazyload inline script
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*
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* @param array $args Array of arguments to populate the lazyload script options.
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* @return string
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*/
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public function getLazyloadScript( $args = [] ) {
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$defaults = [
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'base_url' => '',
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'version' => '',
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];
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$args = wp_parse_args( $args, $defaults );
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$min = ( defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ) ? '' : '.min';
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/**
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* Filters the script tag for the lazyload script
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*
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* @since 2.2.6
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*
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* @param $script_tag HTML tag for the lazyload script.
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*/
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return apply_filters( 'rocket_lazyload_script_tag', '<script data-no-minify="1" async src="' . $args['base_url'] . $args['version'] . '/lazyload' . $min . '.js"></script>' ); // phpcs:ignore WordPress.WP.EnqueuedResources.NonEnqueuedScript
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}
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/**
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* Inserts in the HTML the script to replace the Youtube thumbnail by the iframe.
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*
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* @param array $args Array of arguments to populate the script options.
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* @return void
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*/
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public function insertYoutubeThumbnailScript( $args = [] ) {
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echo $this->getYoutubeThumbnailScript( $args ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
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}
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/**
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* Returns the Youtube Thumbnail inline script
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*
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* @param array $args Array of arguments to populate the script options.
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* @return string
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*/
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public function getYoutubeThumbnailScript( $args = [] ) {
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$defaults = [
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'resolution' => 'hqdefault',
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'lazy_image' => false,
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'native' => true,
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];
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$allowed_resolutions = [
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'default' => [
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'width' => 120,
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'height' => 90,
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],
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'mqdefault' => [
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'width' => 320,
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'height' => 180,
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],
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'hqdefault' => [
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'width' => 480,
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'height' => 360,
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],
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'sddefault' => [
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'width' => 640,
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'height' => 480,
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],
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'maxresdefault' => [
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'width' => 1280,
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'height' => 720,
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],
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];
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$args['resolution'] = ( isset( $args['resolution'] ) && isset( $allowed_resolutions[ $args['resolution'] ] ) ) ? $args['resolution'] : 'hqdefault';
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$args = wp_parse_args( $args, $defaults );
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$image = '<img src="https://i.ytimg.com/vi/ID/' . $args['resolution'] . '.jpg" alt="" width="' . $allowed_resolutions[ $args['resolution'] ]['width'] . '" height="' . $allowed_resolutions[ $args['resolution'] ]['height'] . '">';
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if ( isset( $args['lazy_image'] ) && $args['lazy_image'] ) {
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$attributes = 'alt="" width="' . $allowed_resolutions[ $args['resolution'] ]['width'] . '" height="' . $allowed_resolutions[ $args['resolution'] ]['height'] . '"';
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$image_url = 'https://i.ytimg.com/vi/ID/' . $args['resolution'] . '.jpg';
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$image = '<img data-lazy-src="' . $image_url . '" ' . $attributes . '><noscript><img src="' . $image_url . '" ' . $attributes . '></noscript>';
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if ( $args['native'] ) {
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$image = '<img loading="lazy" src="' . $image_url . '" ' . $attributes . '>';
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}
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}
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return "<script>function lazyLoadThumb(e){var t='{$image}',a='<button class=\"play\" aria-label=\"play Youtube video\"></button>';return t.replace(\"ID\",e)+a}function lazyLoadYoutubeIframe(){var e=document.createElement(\"iframe\"),t=\"ID?autoplay=1\";t+=0===this.parentNode.dataset.query.length?'':'&'+this.parentNode.dataset.query;e.setAttribute(\"src\",t.replace(\"ID\",this.parentNode.dataset.src)),e.setAttribute(\"frameborder\",\"0\"),e.setAttribute(\"allowfullscreen\",\"1\"),e.setAttribute(\"allow\", \"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\"),this.parentNode.parentNode.replaceChild(e,this.parentNode)}document.addEventListener(\"DOMContentLoaded\",function(){var e,t,p,a=document.getElementsByClassName(\"rll-youtube-player\");for(t=0;t<a.length;t++)e=document.createElement(\"div\"),e.setAttribute(\"data-id\",a[t].dataset.id),e.setAttribute(\"data-query\", a[t].dataset.query),e.setAttribute(\"data-src\", a[t].dataset.src),e.innerHTML=lazyLoadThumb(a[t].dataset.id),a[t].appendChild(e),p=e.querySelector('.play'),p.onclick=lazyLoadYoutubeIframe});</script>";
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}
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/**
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* Inserts the CSS to style the Youtube thumbnail container
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*
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* @param array $args Array of arguments to populate the CSS.
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* @return void
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*/
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public function insertYoutubeThumbnailCSS( $args = [] ) {
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wp_register_style( 'rocket-lazyload', false ); // phpcs:ignore WordPress.WP.EnqueuedResourceParameters.MissingVersion
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wp_enqueue_style( 'rocket-lazyload' );
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wp_add_inline_style( 'rocket-lazyload', $this->getYoutubeThumbnailCSS( $args ) );
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}
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/**
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* Returns the CSS for the Youtube Thumbnail
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*
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* @param array $args Array of arguments to populate the CSS.
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* @return string
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*/
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public function getYoutubeThumbnailCSS( $args = [] ) {
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$defaults = [
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'base_url' => '',
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'responsive_embeds' => true,
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];
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$args = wp_parse_args( $args, $defaults );
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$css = '.rll-youtube-player{position:relative;padding-bottom:56.23%;height:0;overflow:hidden;max-width:100%;}.rll-youtube-player:focus-within{outline: 2px solid currentColor;outline-offset: 5px;}.rll-youtube-player iframe{position:absolute;top:0;left:0;width:100%;height:100%;z-index:100;background:0 0}.rll-youtube-player img{bottom:0;display:block;left:0;margin:auto;max-width:100%;width:100%;position:absolute;right:0;top:0;border:none;height:auto;-webkit-transition:.4s all;-moz-transition:.4s all;transition:.4s all}.rll-youtube-player img:hover{-webkit-filter:brightness(75%)}.rll-youtube-player .play{height:100%;width:100%;left:0;top:0;position:absolute;background:url(' . $args['base_url'] . 'img/youtube.png) no-repeat center;background-color: transparent !important;cursor:pointer;border:none;}';
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if ( $args['responsive_embeds'] ) {
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$css .= '.wp-embed-responsive .wp-has-aspect-ratio .rll-youtube-player{position:absolute;padding-bottom:0;width:100%;height:100%;top:0;bottom:0;left:0;right:0}';
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}
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return $css;
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}
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/**
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* Inserts the CSS needed when Javascript is not enabled to keep the display correct
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*/
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public function insertNoJSCSS() {
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echo $this->getNoJSCSS(); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
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}
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/**
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* Returns the CSS to correctly display images when JavaScript is disabled
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*
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* @return string
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*/
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public function getNoJSCSS() {
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return '<noscript><style id="rocket-lazyload-nojs-css">.rll-youtube-player, [data-lazy-src]{display:none !important;}</style></noscript>';
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}
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}
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