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<?php
/**
* Slideshow shortcode usage: [gallery type="slideshow"] or the older [slideshow]
*/
class Jetpack_Slideshow_Shortcode {
public $instance_count = 0;
function __construct() {
global $shortcode_tags;
// Only if the slideshow shortcode has not already been defined.
if ( ! array_key_exists( 'slideshow', $shortcode_tags ) ) {
add_shortcode( 'slideshow', array( $this, 'shortcode_callback' ) );
}
// Only if the gallery shortcode has not been redefined.
if ( isset( $shortcode_tags['gallery'] ) && 'gallery_shortcode' === $shortcode_tags['gallery'] ) {
add_filter( 'post_gallery', array( $this, 'post_gallery' ), 1002, 2 );
add_filter( 'jetpack_gallery_types', array( $this, 'add_gallery_type' ), 10 );
}
/**
* For the moment, comment out the setting for v2.8.
* The remainder should work as it always has.
* See: https://github.com/Automattic/jetpack/pull/85/files
*/
// add_action( 'admin_init', array( $this, 'register_settings' ), 5 );
}
/**
* Responds to the [gallery] shortcode, but not an actual shortcode callback.
*
* @param $value string An empty string if nothing has modified the gallery output, the output html otherwise
* @param $attr array The shortcode attributes array
*
* @return string The (un)modified $value
*/
function post_gallery( $value, $attr ) {
// Bail if somebody else has done something
if ( ! empty( $value ) ) {
return $value;
}
// If [gallery type="slideshow"] have it behave just like [slideshow]
if ( ! empty( $attr['type'] ) && 'slideshow' == $attr['type'] ) {
return $this->shortcode_callback( $attr );
}
return $value;
}
/**
* Add the Slideshow type to gallery settings
*
* @see Jetpack_Tiled_Gallery::media_ui_print_templates
*
* @param $types array An array of types where the key is the value, and the value is the caption.
*
* @return array
*/
function add_gallery_type( $types = array() ) {
$types['slideshow'] = esc_html__( 'Slideshow', 'jetpack' );
return $types;
}
function register_settings() {
add_settings_section( 'slideshow_section', __( 'Image Gallery Slideshow', 'jetpack' ), '__return_empty_string', 'media' );
add_settings_field( 'jetpack_slideshow_background_color', __( 'Background color', 'jetpack' ), array( $this, 'slideshow_background_color_callback' ), 'media', 'slideshow_section' );
register_setting( 'media', 'jetpack_slideshow_background_color', array( $this, 'slideshow_background_color_sanitize' ) );
}
function slideshow_background_color_callback() {
$options = array(
'black' => __( 'Black', 'jetpack' ),
'white' => __( 'White', 'jetpack' ),
);
$this->settings_select( 'jetpack_slideshow_background_color', $options );
}
function settings_select( $name, $values, $extra_text = '' ) {
if ( empty( $name ) || empty( $values ) || ! is_array( $values ) ) {
return;
}
$option = get_option( $name );
?>
<fieldset>
<select name="<?php echo esc_attr( $name ); ?>" id="<?php echo esc_attr( $name ); ?>">
<?php foreach ( $values as $key => $value ) : ?>
<option value="<?php echo esc_attr( $key ); ?>" <?php selected( $key, $option ); ?>>
<?php echo esc_html( $value ); ?>
</option>
<?php endforeach; ?>
</select>
<?php if ( ! empty( $extra_text ) ) : ?>
<p class="description"><?php echo esc_html( $extra_text ); ?></p>
<?php endif; ?>
</fieldset>
<?php
}
function slideshow_background_color_sanitize( $value ) {
return ( 'white' == $value ) ? 'white' : 'black';
}
function shortcode_callback( $attr ) {
$post_id = get_the_ID();
$attr = shortcode_atts(
array(
'trans' => 'fade',
'order' => 'ASC',
'orderby' => 'menu_order ID',
'id' => $post_id,
'include' => '',
'exclude' => '',
'autostart' => true,
'size' => '',
), $attr, 'slideshow'
);
if ( 'rand' == strtolower( $attr['order'] ) ) {
$attr['orderby'] = 'none';
}
$attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );
if ( ! $attr['orderby'] ) {
$attr['orderby'] = 'menu_order ID';
}
if ( ! $attr['size'] ) {
$attr['size'] = 'full';
}
// Don't restrict to the current post if include
$post_parent = ( empty( $attr['include'] ) ) ? intval( $attr['id'] ) : null;
$attachments = get_posts(
array(
'post_status' => 'inherit',
'post_type' => 'attachment',
'post_mime_type' => 'image',
'posts_per_page' => - 1,
'post_parent' => $post_parent,
'order' => $attr['order'],
'orderby' => $attr['orderby'],
'include' => $attr['include'],
'exclude' => $attr['exclude'],
)
);
if ( count( $attachments ) < 1 ) {
return false;
}
$gallery_instance = sprintf( 'gallery-%d-%d', $attr['id'], ++$this->instance_count );
$gallery = array();
foreach ( $attachments as $attachment ) {
$attachment_image_src = wp_get_attachment_image_src( $attachment->ID, $attr['size'] );
$attachment_image_src = $attachment_image_src[0]; // [url, width, height]
$attachment_image_title = get_the_title( $attachment->ID );
$attachment_image_alt = get_post_meta( $attachment->ID, '_wp_attachment_image_alt', true );
/**
* Filters the Slideshow slide caption.
*
* @module shortcodes
*
* @since 2.3.0
*
* @param string wptexturize( strip_tags( $attachment->post_excerpt ) ) Post excerpt.
* @param string $attachment ->ID Attachment ID.
*/
$caption = apply_filters( 'jetpack_slideshow_slide_caption', wptexturize( strip_tags( $attachment->post_excerpt ) ), $attachment->ID );
$gallery[] = (object) array(
'src' => (string) esc_url_raw( $attachment_image_src ),
'id' => (string) $attachment->ID,
'title' => (string) esc_attr( $attachment_image_title ),
'alt' => (string) esc_attr( $attachment_image_alt ),
'caption' => (string) $caption,
'itemprop' => 'image',
);
}
$color = Jetpack_Options::get_option( 'slideshow_background_color', 'black' );
$js_attr = array(
'gallery' => $gallery,
'selector' => $gallery_instance,
'trans' => $attr['trans'] ? $attr['trans'] : 'fade',
'autostart' => $attr['autostart'] ? $attr['autostart'] : 'true',
'color' => $color,
);
// Show a link to the gallery in feeds.
if ( is_feed() ) {
return sprintf(
'<a href="%s">%s</a>',
esc_url( get_permalink( $post_id ) . '#' . $gallery_instance . '-slideshow' ),
esc_html__( 'Click to view slideshow.', 'jetpack' )
);
}
return $this->slideshow_js( $js_attr );
}
/**
* Render the slideshow js
*
* Returns the necessary markup and js to fire a slideshow.
*
* @param $attr array Attributes for the slideshow.
*
* @uses $this->enqueue_scripts()
*
* @return string HTML output.
*/
function slideshow_js( $attr ) {
// Enqueue scripts
$this->enqueue_scripts();
$output = '';
if ( defined( 'JSON_HEX_AMP' ) ) {
// This is nice to have, but not strictly necessary since we use _wp_specialchars() below
$gallery = json_encode( $attr['gallery'], JSON_HEX_TAG | JSON_HEX_AMP | JSON_HEX_APOS | JSON_HEX_QUOT );
} else {
$gallery = json_encode( $attr['gallery'] );
}
$output .= '<p class="jetpack-slideshow-noscript robots-nocontent">' . esc_html__( 'This slideshow requires JavaScript.', 'jetpack' ) . '</p>';
$output .= sprintf(
'<div id="%s" class="slideshow-window jetpack-slideshow slideshow-%s" data-trans="%s" data-autostart="%s" data-gallery="%s" itemscope itemtype="https://schema.org/ImageGallery"></div>',
esc_attr( $attr['selector'] . '-slideshow' ),
esc_attr( $attr['color'] ),
esc_attr( $attr['trans'] ),
esc_attr( $attr['autostart'] ),
/*
* The input to json_encode() above can contain '"'.
*
* For calls to json_encode() lacking the JSON_HEX_AMP option,
* that '"' is left unaltered. Running '"' through esc_attr()
* also leaves it unaltered since esc_attr() does not double-encode.
*
* This means we end up with an attribute like
* `data-gallery="{"foo":"""}"`,
* which is interpreted by the browser as `{"foo":"""}`,
* which cannot be JSON decoded.
*
* The preferred workaround is to include the JSON_HEX_AMP (and friends)
* options, but these are not available until 5.3.0.
* Alternatively, we can use _wp_specialchars( , , , true ) instead of
* esc_attr(), which will double-encode.
*
* Since we can't rely on JSON_HEX_AMP, we do both.
*/
_wp_specialchars( wp_check_invalid_utf8( $gallery ), ENT_QUOTES, false, true )
);
return $output;
}
/**
* Actually enqueues the scripts and styles.
*/
function enqueue_scripts() {
wp_enqueue_script( 'jquery-cycle', plugins_url( '/js/jquery.cycle.min.js', __FILE__ ), array( 'jquery' ), '20161231', true );
wp_enqueue_script( 'jetpack-slideshow', plugins_url( '/js/slideshow-shortcode.js', __FILE__ ), array( 'jquery-cycle' ), '20160119.1', true );
wp_enqueue_style( 'jetpack-slideshow', plugins_url( '/css/slideshow-shortcode.css', __FILE__ ) );
wp_style_add_data( 'jetpack-slideshow', 'rtl', 'replace' );
wp_localize_script(
'jetpack-slideshow',
'jetpackSlideshowSettings',
/**
* Filters the slideshow JavaScript spinner.
*
* @module shortcodes
*
* @since 2.1.0
* @since 4.7.0 Added the `speed` option to the array of options.
*
* @param array $args
* - string - spinner - URL of the spinner image.
* - string - speed - Speed of the slideshow. Defaults to 4000.
*/
apply_filters( 'jetpack_js_slideshow_settings', array(
'spinner' => plugins_url( '/img/slideshow-loader.gif', __FILE__ ),
'speed' => '4000',
) )
);
}
public static function init() {
new Jetpack_Slideshow_Shortcode;
}
}
Jetpack_Slideshow_Shortcode::init();
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