Version 1

[yaffs-website] / web / core / lib / Drupal / Core / Render / Element / Weight.php

diff --git a/web/core/lib/Drupal/Core/Render/Element/Weight.php b/web/core/lib/Drupal/Core/Render/Element/Weight.php
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+++ b/web/core/lib/Drupal/Core/Render/Element/Weight.php
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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;
+  }
+
+}