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<?php
namespace Drupal\Core\Form;
use Drupal\Component\Utility\NestedArray;
/**
* Provides methods to manage form state values.
*
* @see \Drupal\Core\Form\FormStateInterface
*
* @ingroup form_api
*/
trait FormStateValuesTrait {
/**
* Implements \Drupal\Core\Form\FormStateInterface::getValues()
*/
abstract public function &getValues();
/**
* Implements \Drupal\Core\Form\FormStateInterface::getValue()
*/
public function &getValue($key, $default = NULL) {
$exists = NULL;
$value = &NestedArray::getValue($this->getValues(), (array) $key, $exists);
if (!$exists) {
$value = $default;
}
return $value;
}
/**
* Implements \Drupal\Core\Form\FormStateInterface::setValues()
*/
public function setValues(array $values) {
$existing_values = &$this->getValues();
$existing_values = $values;
return $this;
}
/**
* Implements \Drupal\Core\Form\FormStateInterface::setValue()
*/
public function setValue($key, $value) {
NestedArray::setValue($this->getValues(), (array) $key, $value, TRUE);
return $this;
}
/**
* Implements \Drupal\Core\Form\FormStateInterface::unsetValue()
*/
public function unsetValue($key) {
NestedArray::unsetValue($this->getValues(), (array) $key);
return $this;
}
/**
* Implements \Drupal\Core\Form\FormStateInterface::hasValue()
*/
public function hasValue($key) {
$exists = NULL;
$value = NestedArray::getValue($this->getValues(), (array) $key, $exists);
return $exists && isset($value);
}
/**
* Implements \Drupal\Core\Form\FormStateInterface::isValueEmpty()
*/
public function isValueEmpty($key) {
$exists = NULL;
$value = NestedArray::getValue($this->getValues(), (array) $key, $exists);
return !$exists || empty($value);
}
/**
* Implements \Drupal\Core\Form\FormStateInterface::setValueForElement()
*/
public function setValueForElement(array $element, $value) {
return $this->setValue($element['#parents'], $value);
}
}