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<?php
namespace Drupal\Core\Render\Element;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Render\Element;
/**
* Provides a slider for input of a number within a specific range.
*
* Provides an HTML5 input element with type of "range".
*
* Properties:
* - #min: Minimum value (defaults to 0).
* - #max: Maximum value (defaults to 100).
* Refer to \Drupal\Core\Render\Element\Number for additional properties.
*
* Usage example:
* @code
* $form['quantity'] = array(
* '#type' => 'range',
* '#title' => $this->t('Quantity'),
* );
* @endcode
*
* @see \Drupal\Core\Render\Element\Number
*
* @FormElement("range")
*/
class Range extends Number {
/**
* {@inheritdoc}
*/
public function getInfo() {
$info = parent::getInfo();
$class = get_class($this);
return [
'#min' => 0,
'#max' => 100,
'#pre_render' => [
[$class, 'preRenderRange'],
],
'#theme' => 'input__range',
] + $info;
}
/**
* Prepares a #type 'range' render element for input.html.twig.
*
* @param array $element
* An associative array containing the properties of the element.
* Properties used: #title, #value, #description, #min, #max, #attributes,
* #step.
*
* @return array
* The $element with prepared variables ready for input.html.twig.
*/
public static function preRenderRange($element) {
$element['#attributes']['type'] = 'range';
Element::setAttributes($element, ['id', 'name', 'value', 'step', 'min', 'max']);
static::setAttributes($element, ['form-range']);
return $element;
}
/**
* {@inheritdoc}
*/
public static function valueCallback(&$element, $input, FormStateInterface $form_state) {
if ($input === '') {
$offset = ($element['#max'] - $element['#min']) / 2;
// Round to the step.
if (strtolower($element['#step']) != 'any') {
$steps = round($offset / $element['#step']);
$offset = $element['#step'] * $steps;
}
return $element['#min'] + $offset;
}
}
}