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- <?php
- namespace Drupal\Core\Render\Element;
- use Drupal\Core\Form\FormStateInterface;
- /**
- * Provides an interface for form element plugins.
- *
- * Form element plugins are a subset of render elements, specifically
- * representing HTML elements that take input as part of a form. Form element
- * plugins are discovered via the same mechanism as regular render element
- * plugins. See \Drupal\Core\Render\Element\ElementInterface for general
- * information about render element plugins.
- *
- * @see \Drupal\Core\Render\ElementInfoManager
- * @see \Drupal\Core\Render\Element\FormElement
- * @see \Drupal\Core\Render\Annotation\FormElement
- * @see plugin_api
- *
- * @ingroup theme_render
- */
- interface FormElementInterface extends ElementInterface {
- /**
- * Determines how user input is mapped to an element's #value property.
- *
- * @param array $element
- * An associative array containing the properties of the element.
- * @param mixed $input
- * The incoming input to populate the form element. If this is FALSE,
- * the element's default value should be returned.
- * @param \Drupal\Core\Form\FormStateInterface $form_state
- * The current state of the form.
- *
- * @return mixed
- * The value to assign to the element.
- */
- public static function valueCallback(&$element, $input, FormStateInterface $form_state);
- }
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