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<?php
namespace Drupal\Core\Render\Element;
use Drupal\Core\Render\Element;
/**
* Provides a form element for a single radio button.
*
* This is an internal element that is primarily used to render the radios form
* element. Refer to \Drupal\Core\Render\Element\Radios for more documentation.
*
* @see \Drupal\Core\Render\Element\Radios
* @see \Drupal\Core\Render\Element\Checkbox
*
* @FormElement("radio")
*/
class Radio extends FormElement {
/**
* {@inheritdoc}
*/
public function getInfo() {
$class = get_class($this);
return [
'#input' => TRUE,
'#default_value' => NULL,
'#process' => [
[$class, 'processAjaxForm'],
],
'#pre_render' => [
[$class, 'preRenderRadio'],
],
'#theme' => 'input__radio',
'#theme_wrappers' => ['form_element'],
'#title_display' => 'after',
];
}
/**
* Prepares a #type 'radio' render element for input.html.twig.
*
* @param array $element
* An associative array containing the properties of the element.
* Properties used: #required, #return_value, #value, #attributes, #title,
* #description. The #name property will be sanitized before output. This is
* currently done by initializing Drupal\Core\Template\Attribute with all
* the attributes.
*
* @return array
* The $element with prepared variables ready for input.html.twig.
*/
public static function preRenderRadio($element) {
$element['#attributes']['type'] = 'radio';
Element::setAttributes($element, ['id', 'name', '#return_value' => 'value']);
if (isset($element['#return_value']) && $element['#value'] !== FALSE && $element['#value'] == $element['#return_value']) {
$element['#attributes']['checked'] = 'checked';
}
static::setAttributes($element, ['form-radio']);
return $element;
}
}