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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_data_options', array( $this, 'add_lazyload_options' ), 10, 3 ); |
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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 become visible in the browser. This significantly improves page loading times.', 'foogallery' ), |
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'section' => __( 'Thumbnails', 'foogallery' ), |
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'spacer' => '<span class="spacer"></span>', |
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'type' => 'radio', |
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'choices' => array( |
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'yes' => __( 'Enabled', 'foogallery' ), |
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'no' => __( 'Disabled', 'foogallery' ) |
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) |
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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, $post ) { |
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//always enable lazyload by default |
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$lazy_load = true; |
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if ( true === foogallery_get_setting( 'disable_lazy_load', false ) ) { |
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$lazy_load = false; |
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} |
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$foogallery->lazyload = apply_filters( 'foogallery_lazy_load', $lazy_load, $foogallery ); |
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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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global $current_foogallery_template; |
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$lazyload_support = isset($current_foogallery_template['lazyload_support']) && |
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true === $current_foogallery_template['lazyload_support']; |
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if ( $lazyload_support && |
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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 options if needed |
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* |
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* @param $attributes array |
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* @param $gallery FooGallery |
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* |
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* @return array |
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*/ |
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function add_lazyload_options($options, $gallery, $attributes) { |
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if ( isset( $gallery->lazyload) && true === $gallery->lazyload) { |
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$options['lazy'] = true; |
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} |
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return $options; |
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} |
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} |
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} |
fooplugins /
foogallery
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