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<?php
namespace Drupal\Core\Render\Element;
use Drupal\Core\Form\FormStateInterface;
/**
* Provides a form element for input of a weight.
*
* Weights are integers used to indicate ordering, with larger numbers later in
* the order.
*
* Properties:
* - #delta: The range of possible weight values used. A delta of 10 would
* indicate possible weight values between -10 and 10.
*
* Usage example:
* @code
* $form['weight'] = array(
* '#type' => 'weight',
* '#title' => $this->t('Weight'),
* '#default_value' => $edit['weight'],
* '#delta' => 10,
* );
* @endcode
*
* @FormElement("weight")
*/
class Weight extends FormElement {
/**
* {@inheritdoc}
*/
public function getInfo() {
$class = get_class($this);
return [
'#input' => TRUE,
'#delta' => 10,
'#default_value' => 0,
'#process' => [
[$class, 'processWeight'],
[$class, 'processAjaxForm'],
],
];
}
/**
* Expands a weight element into a select element.
*/
public static function processWeight(&$element, FormStateInterface $form_state, &$complete_form) {
$element['#is_weight'] = TRUE;
$element_info_manager = \Drupal::service('element_info');
// If the number of options is small enough, use a select field.
$max_elements = \Drupal::config('system.site')->get('weight_select_max');
if ($element['#delta'] <= $max_elements) {
$element['#type'] = 'select';
$weights = [];
for ($n = (-1 * $element['#delta']); $n <= $element['#delta']; $n++) {
$weights[$n] = $n;
}
$element['#options'] = $weights;
$element += $element_info_manager->getInfo('select');
}
// Otherwise, use a text field.
else {
$element['#type'] = 'number';
// Use a field big enough to fit most weights.
$element['#size'] = 10;
$element += $element_info_manager->getInfo('number');
}
return $element;
}
}