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<?php |
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/** |
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* Class used to handle lazy loading for gallery templates |
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* Date: 20/03/2017 |
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*/ |
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if ( ! class_exists( 'FooGallery_LazyLoad' ) ) { |
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class FooGallery_LazyLoad { |
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function __construct() { |
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if ( is_admin() ) { |
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//add extra fields to the templates that support lazy loading |
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add_filter( 'foogallery_override_gallery_template_fields', array( $this, 'add_lazyload_fields' ), 10, 2 ); |
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} |
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//adds the lazyload property to a FooGallery |
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add_action( 'foogallery_foogallery_instance_after_load', array( $this, 'determine_lazyload' ), 10, 2 ); |
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//change the image src attribute to data attributes if lazy loading is enabled |
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add_filter( 'foogallery_attachment_html_image_attributes', array($this, 'change_src_attributes'), 99, 3); |
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//add the lazy load attributes to the gallery container |
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add_filter( 'foogallery_build_container_attributes', array( $this, 'add_lazyload_attributes' ), 10, 2 ); |
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//add the appropriate lazy load class |
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add_filter( 'foogallery_build_class_attribute', array( $this, 'add_lazyload_class' ), 10, 2 ); |
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} |
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/** |
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* Add lazy load fields to the gallery template |
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* |
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* @uses "foogallery_override_gallery_template_fields" |
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* @param $fields |
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* @param $template |
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* |
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* @return array |
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*/ |
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function add_lazyload_fields( $fields, $template ) { |
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if ( $template && array_key_exists( 'lazyload_support', $template ) && true === $template['lazyload_support'] ) { |
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$fields[] = array( |
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'id' => 'lazyload', |
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'title' => __( 'Lazy Loading', 'foogallery' ), |
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'desc' => __( 'Lazy loading means images in your gallery are only loaded when they are visible in browser. This significantly improves page loading times.', 'foogallery' ), |
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'section' => __( 'Gallery Settings', 'foogallery' ), |
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'type' => 'radio', |
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'choices' => array( |
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'yes' => __( 'Enable Lazy Loading', 'foogallery' ), |
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'no' => __( 'Disabled', 'foogallery' ) |
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), |
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'spacer' => '<span class="spacer"></span>' |
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); |
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} |
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return $fields; |
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} |
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/** |
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* Determine if the gallery has lazy loading enabled |
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* |
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* @param $foogallery |
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* @param $post |
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*/ |
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function determine_lazyload( $foogallery, $post ) { |
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$gallery_template = $foogallery->gallery_template; |
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$setting_key = "{$gallery_template}_lazyload"; |
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if ( 'yes' === $foogallery->get_meta( $setting_key, 'yes' ) ) { |
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$foogallery->lazyload = true; |
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} |
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} |
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/** |
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* @param array $attr |
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* @param array $args |
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* @param FooGalleryAttachment $attachment |
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* @return mixed |
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*/ |
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function change_src_attributes($attr, $args, $attachment) { |
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global $current_foogallery; |
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if ( isset( $current_foogallery->lazyload) && true === $current_foogallery->lazyload) { |
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if ( isset( $attr['src'] ) ) { |
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//rename src => data-src |
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$src = $attr['src']; |
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unset( $attr['src'] ); |
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$attr['data-src'] = $src; |
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} |
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if ( isset( $attr['srcset'] ) ) { |
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//rename srcset => data-srcset |
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$src = $attr['srcset']; |
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unset( $attr['srcset'] ); |
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$attr['data-srcset'] = $src; |
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} |
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} |
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return $attr; |
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} |
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/** |
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* Add the required lazy load attributes onto the gallery container div |
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* |
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* @param $attributes array |
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* @param $gallery FooGallery |
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* |
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* @return array |
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*/ |
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function add_lazyload_attributes($attributes, $gallery) { |
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if ( isset( $gallery->lazyload) && true === $gallery->lazyload) { |
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$attributes['data-loader-options'] = '{\'lazy\':true}'; |
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} |
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return $attributes; |
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} |
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/** |
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* Add the required lazy load class to the gallery |
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* |
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* @param $classes array |
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* @param $gallery FooGallery |
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* |
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* @return array |
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*/ |
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function add_lazyload_class($classes, $gallery) { |
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if ( isset( $gallery->lazyload) && true === $gallery->lazyload) { |
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$classes[] = apply_filters( 'foogallery_lazyload_class', 'loaded-fade-in' ); |
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} |
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return $classes; |
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} |
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} |
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} |
fooplugins /
foogallery
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