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<?php |
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/** |
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* FooGallery_CSS_Load_Optimizer class which enqueues CSS in the head |
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*/ |
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if (!class_exists('class-css-load-optimizer.php')) { |
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class FooGallery_CSS_Load_Optimizer { |
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function __construct() { |
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add_action( 'wp_enqueue_scripts', array( $this, 'include_gallery_css' ) ); |
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add_action( 'foogallery_enqueue_style', array( $this, 'persist_enqueued_style' ), 10, 5 ); |
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} |
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/** |
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* Get the current post ids for the view that is being shown |
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*/ |
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function get_post_ids_from_query() { |
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global $wp_query; |
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if ( is_singular() ) { |
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return array( $wp_query->post->ID ); |
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} else if ( is_array( $wp_query->posts ) ) { |
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return wp_list_pluck( $wp_query->posts, 'ID' ); |
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} else { |
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return array(); |
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} |
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} |
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/** |
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* Checks the post meta for any FooGallery CSS that needs to be added to the head |
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* |
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*/ |
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function include_gallery_css() { |
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global $enqueued_foogallery_styles; |
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$enqueued_foogallery_styles = array(); |
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foreach( $this->get_post_ids_from_query() as $post_id ) { |
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$this->include_gallery_stylesheets_for_post( $post_id ); |
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} |
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} |
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/** |
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* includes any CSS that needs to be added for a post |
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* |
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* @param $post_id int ID of the post |
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*/ |
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function include_gallery_stylesheets_for_post( $post_id ) { |
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global $enqueued_foogallery_styles; |
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if ( $post_id ) { |
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//get any foogallery stylesheets that the post might need to include |
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$css = get_post_meta($post_id, FOOGALLERY_META_POST_USAGE_CSS); |
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foreach ($css as $css_item) { |
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if (!$css_item) continue; |
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foreach ($css_item as $handle => $style) { |
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//only enqueue the stylesheet once |
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if ( !array_key_exists( $handle, $enqueued_foogallery_styles ) ) { |
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$cache_buster_key = $handle; |
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if ( is_array( $style ) ) { |
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$cache_buster_key = $this->create_cache_buster_key( $handle, $style['ver'], array_key_exists( 'site', $style ) ? $style['site'] : '' ); |
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wp_enqueue_style( $handle, $style['src'], $style['deps'], $style['ver'], $style['media'] ); |
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} else { |
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wp_enqueue_style( $handle, $style ); |
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} |
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$enqueued_foogallery_styles[$handle] = $cache_buster_key; |
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} |
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} |
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} |
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} |
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} |
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/** |
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* Check to make sure we have added the stylesheets to our custom post meta field, |
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* so that on next render the stylesheet will be added to the page header |
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* |
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* @param $style_handle string The stylesheet handle |
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* @param $src string The location for the stylesheet |
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* @param array $deps |
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* @param bool $ver |
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* @param string $media |
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*/ |
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function persist_enqueued_style($style_handle, $src, $deps = array(), $ver = false, $media = 'all') { |
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global $wp_query, $enqueued_foogallery_styles; |
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//we only want to do this if we are looking at a single post |
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if ( ! is_singular() ) { |
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return; |
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} |
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$post_id = $wp_query->post->ID; |
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if ( $post_id ) { |
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//check if the saved stylesheet needs to be cache busted |
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if ( is_array( $enqueued_foogallery_styles ) && array_key_exists( $style_handle, $enqueued_foogallery_styles ) ) { |
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$registered_cache_buster_key = $enqueued_foogallery_styles[$style_handle]; |
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//generate the key we want |
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$cache_buster_key = $this->create_cache_buster_key( $style_handle, $ver, home_url() ); |
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if ( $registered_cache_buster_key !== $cache_buster_key ) { |
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//we need to bust this cached stylesheet! |
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$style = $this->get_old_style_post_meta_value( $post_id, $style_handle ); |
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if ( false !== $style ) { |
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delete_post_meta( $post_id, FOOGALLERY_META_POST_USAGE_CSS, array( $style_handle => $style ) ); |
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//unset the handle from, to force the save of the post meta |
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unset( $enqueued_foogallery_styles[$style_handle] ); |
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} |
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} |
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} |
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//first check that the template has not been enqueued before |
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if ( is_array( $enqueued_foogallery_styles ) && ! array_key_exists( $style_handle, $enqueued_foogallery_styles ) ) { |
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$style = array( |
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'src' => $src, |
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'deps' => $deps, |
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'ver' => $ver, |
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'media' => $media, |
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'site' => home_url() |
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); |
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add_post_meta( $post_id, FOOGALLERY_META_POST_USAGE_CSS, array( $style_handle => $style ), false ); |
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} |
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} |
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} |
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function create_cache_buster_key( $name, $version, $site = '' ) { |
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return "{$site}::{$name}_{$version}"; |
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} |
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function get_old_style_post_meta_value( $post_id, $handle_to_find ) { |
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$css = get_post_meta($post_id, FOOGALLERY_META_POST_USAGE_CSS); |
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foreach ($css as $css_item) { |
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if ( ! $css_item ) { |
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continue; |
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} |
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foreach ( $css_item as $handle => $style ) { |
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//only enqueue the stylesheet once |
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if ( $handle_to_find === $handle ) { |
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return $style; |
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} |
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} |
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} |
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return false; |
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} |
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} |
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} |
fooplugins /
foogallery
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Adding explicit visibility (
private,protected, orpublic) is generally recommend to communicate to other developers how, and from where this method is intended to be used.