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<?php
/**
* Preview renderer for image fields.
*
* Tries to be clever about WP attachments and use thumbnails instead of full size images whenever possible.
*
* For displaying the full image on clicking on the preview, you need to enqueue the 'wpcf-js' script and
* the 'wptoolset-forms-admin' style
*
* @since 1.9.1
*/
final class WPCF_Field_Renderer_Preview_Image extends WPCF_Field_Renderer_Preview_Base {
/** Maximum width and height of an image. */
const DEFAULT_MAX_IMAGE_SIZE = '60px';
/**
* @param mixed $value Single field value in the intermediate format (see data mappers for details)
*
* @return string Rendered HTML
*/
protected function render_single( $value ) {
if( !is_string( $value ) || empty( $value ) ) {
return '';
}
$original_image_url = $value;
$image_url = $this->try_finding_attachment( $original_image_url );
$image_size = esc_attr( $this->get_maximum_image_size() );
$output = sprintf(
'<div class="js-wpt-file-preview wpt-file-preview">
<img src="%s" style="max-width: %s; max-height: %s; border: 1px grey solid;" data-full-src="%s" />
</div>',
esc_url( $image_url ),
$image_size,
$image_size,
esc_url( $original_image_url )
);
return $output;
}
/**
* For given URL, try to find an attachment with this file and if successful, try finding thumbnail URL.
*
* Returns original URL on failure.
*
* @param string $url Image URL
* @return string URl of the thumbnail or original image.
* @since 1.9.1
*/
protected function try_finding_attachment( $url ) {
$attachment_id = Types_Utils::get_attachment_id_by_url( $url );
if( 0 == $attachment_id ) {
return $url;
}
$attachment_src = wp_get_attachment_image_src( $attachment_id, 'thumbnail' );
if( false == $attachment_src ) {
return $url;
}
return ( is_string( $attachment_src[0] ) ? $attachment_src[0] : $url );
}
protected function get_value_separator() {
return ' ';
}
protected function get_maximum_image_size() {
return wpcf_getarr( $this->args, 'maximum_image_size', self::DEFAULT_MAX_IMAGE_SIZE );
}
/**
* @inheritdoc
* @return int
*/
protected function get_maximum_total_length() {
return 0;
}
}