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<?php | |
/** | |
* @file | |
* Contains \Drupal\Core\Render\Element\VerticalTabs. | |
*/ | |
namespace Drupal\Core\Render\Element; | |
use Drupal\Core\Form\FormStateInterface; | |
use Drupal\Core\Render\Element; | |
/** | |
* Provides a render element for vertical tabs in a form. | |
* | |
* Formats all child and non-child details elements whose #group is assigned | |
* this element's name as vertical tabs. | |
* | |
* Properties: | |
* - #default_tab: The HTML ID of the rendered details element to be used as | |
* the default tab. View the source of the rendered page to determine the ID. | |
* | |
* Usage example: | |
* @code | |
* $form['information'] = array( | |
* '#type' => 'vertical_tabs', | |
* '#default_tab' => 'edit-publication', | |
* ); | |
* | |
* $form['author'] = array( | |
* '#type' => 'details', | |
* '#title' => 'Author', | |
* '#group' => 'information', | |
* ); | |
* | |
* $form['author']['name'] = array( | |
* '#type' => 'textfield', | |
* '#title' => t('Name'), | |
* ); | |
* | |
* $form['publication'] = array( | |
* '#type' => 'details', | |
* '#title' => t('Publication'), | |
* '#group' => 'information', | |
* ); | |
* | |
* $form['publication']['publisher'] = array( | |
* '#type' => 'textfield', | |
* '#title' => t('Publisher'), | |
* ); | |
* @endcode | |
* | |
* @FormElement("vertical_tabs") | |
*/ | |
class VerticalTabs extends RenderElement { | |
/** | |
* {@inheritdoc} | |
*/ | |
public function getInfo() { | |
$class = get_class($this); | |
return array( | |
'#default_tab' => '', | |
'#process' => array( | |
array($class, 'processVerticalTabs'), | |
), | |
'#pre_render' => array( | |
array($class, 'preRenderVerticalTabs'), | |
), | |
'#theme_wrappers' => array('vertical_tabs', 'form_element'), | |
); | |
} | |
/** | |
* Prepares a vertical_tabs element for rendering. | |
* | |
* @param array $element | |
* An associative array containing the properties and children of the | |
* vertical tabs element. | |
* | |
* @return array | |
* The modified element. | |
*/ | |
public static function preRenderVerticalTabs($element) { | |
// Do not render the vertical tabs element if it is empty. | |
$group = implode('][', $element['#parents']); | |
if (!Element::getVisibleChildren($element['group']['#groups'][$group])) { | |
$element['#printed'] = TRUE; | |
} | |
return $element; | |
} | |
/** | |
* Creates a group formatted as vertical tabs. | |
* | |
* @param array $element | |
* An associative array containing the properties and children of the | |
* details element. | |
* @param \Drupal\Core\Form\FormStateInterface $form_state | |
* The current state of the form. | |
* @param array $complete_form | |
* The complete form structure. | |
* | |
* @return array | |
* The processed element. | |
*/ | |
public static function processVerticalTabs(&$element, FormStateInterface $form_state, &$complete_form) { | |
if (isset($element['#access']) && !$element['#access']) { | |
return $element; | |
} | |
// Inject a new details as child, so that form_process_details() processes | |
// this details element like any other details. | |
$element['group'] = array( | |
'#type' => 'details', | |
'#theme_wrappers' => array(), | |
'#parents' => $element['#parents'], | |
); | |
// Add an invisible label for accessibility. | |
if (!isset($element['#title'])) { | |
$element['#title'] = t('Vertical Tabs'); | |
$element['#title_display'] = 'invisible'; | |
} | |
$element['#attached']['library'][] = 'core/drupal.vertical-tabs'; | |
// The JavaScript stores the currently selected tab in this hidden | |
// field so that the active tab can be restored the next time the | |
// form is rendered, e.g. on preview pages or when form validation | |
// fails. | |
$name = implode('__', $element['#parents']); | |
if ($form_state->hasValue($name . '__active_tab')){ | |
$element['#default_tab'] = $form_state->getValue($name . '__active_tab'); | |
} | |
$element[$name . '__active_tab'] = array( | |
'#type' => 'hidden', | |
'#default_value' => $element['#default_tab'], | |
'#attributes' => array('class' => array('vertical-tabs-active-tab')), | |
); | |
// Clean up the active tab value so it's not accidentally stored in | |
// settings forms. | |
$form_state->addCleanValueKey($name . '__active_tab'); | |
return $element; | |
} | |
} |