Version 1

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

diff --git a/web/core/lib/Drupal/Core/Render/Element/Button.php b/web/core/lib/Drupal/Core/Render/Element/Button.php
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+++ b/web/core/lib/Drupal/Core/Render/Element/Button.php
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+<?php
+
+namespace Drupal\Core\Render\Element;
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Render\Element;
+
+/**
+ * Provides an action button form element.
+ *
+ * When the button is pressed, the form will be submitted to Drupal, where it is
+ * validated and rebuilt. The submit handler is not invoked.
+ *
+ * Properties:
+ * - #limit_validation_errors: An array of form element keys that will block
+ *   form submission when validation for these elements or any child elements
+ *   fails. Specify an empty array to suppress all form validation errors.
+ * - #value: The text to be shown on the button.
+ *
+ *
+ * Usage Example:
+ * @code
+ * $form['actions']['preview'] = array(
+ *   '#type' => 'button',
+ *   '#value' => $this->t('Preview'),
+ * );
+ * @endcode
+ *
+ * @see \Drupal\Core\Render\Element\Submit
+ *
+ * @FormElement("button")
+ */
+class Button extends FormElement {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getInfo() {
+    $class = get_class($this);
+    return [
+      '#input' => TRUE,
+      '#name' => 'op',
+      '#is_button' => TRUE,
+      '#executes_submit_callback' => FALSE,
+      '#limit_validation_errors' => FALSE,
+      '#process' => [
+        [$class, 'processButton'],
+        [$class, 'processAjaxForm'],
+      ],
+      '#pre_render' => [
+        [$class, 'preRenderButton'],
+      ],
+      '#theme_wrappers' => ['input__submit'],
+    ];
+  }
+
+  /**
+   * Processes a form button element.
+   */
+  public static function processButton(&$element, FormStateInterface $form_state, &$complete_form) {
+    // If this is a button intentionally allowing incomplete form submission
+    // (e.g., a "Previous" or "Add another item" button), then also skip
+    // client-side validation.
+    if (isset($element['#limit_validation_errors']) && $element['#limit_validation_errors'] !== FALSE) {
+      $element['#attributes']['formnovalidate'] = 'formnovalidate';
+    }
+    return $element;
+  }
+
+  /**
+   * Prepares a #type 'button' render element for input.html.twig.
+   *
+   * @param array $element
+   *   An associative array containing the properties of the element.
+   *   Properties used: #attributes, #button_type, #name, #value. The
+   *   #button_type property accepts any value, though core themes have CSS that
+   *   styles the following button_types appropriately: 'primary', 'danger'.
+   *
+   * @return array
+   *   The $element with prepared variables ready for input.html.twig.
+   */
+  public static function preRenderButton($element) {
+    $element['#attributes']['type'] = 'submit';
+    Element::setAttributes($element, ['id', 'name', 'value']);
+
+    $element['#attributes']['class'][] = 'button';
+    if (!empty($element['#button_type'])) {
+      $element['#attributes']['class'][] = 'button--' . $element['#button_type'];
+    }
+    $element['#attributes']['class'][] = 'js-form-submit';
+    $element['#attributes']['class'][] = 'form-submit';
+
+    if (!empty($element['#attributes']['disabled'])) {
+      $element['#attributes']['class'][] = 'is-disabled';
+    }
+
+    return $element;
+  }
+
+}