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<?php
namespace Drupal\Core\Render\Element;
/**
* Provides a render element for a set of links rendered as a drop-down button.
*
* By default, this element sets #theme so that the 'links' theme hook is used
* for rendering, with suffixes so that themes can override this specifically
* without overriding all links theming. If the #subtype property is provided in
* your render array with value 'foo', #theme is set to links__dropbutton__foo;
* if not, it's links__dropbutton; both of these can be overridden by setting
* the #theme property in your render array. See template_preprocess_links()
* for documentation on the other properties used in theming; for instance, use
* element property #links to provide $variables['links'] for theming.
*
* Properties:
* - #links: An array of links to actions. See template_preprocess_links() for
* documentation the properties of links in this array.
*
* Usage Example:
* @code
* $form['actions']['extra_actions'] = array(
* '#type' => 'dropbutton',
* '#links' => array(
* 'simple_form' => array(
* 'title' => $this->t('Simple Form'),
* 'url' => Url::fromRoute('fapi_example.simple_form'),
* ),
* 'demo' => array(
* 'title' => $this->t('Build Demo'),
* 'url' => Url::fromRoute('fapi_example.build_demo'),
* ),
* ),
* );
* @endcode
*
* @see \Drupal\Core\Render\Element\Operations
*
* @RenderElement("dropbutton")
*/
class Dropbutton extends RenderElement {
/**
* {@inheritdoc}
*/
public function getInfo() {
$class = get_class($this);
return [
'#pre_render' => [
[$class, 'preRenderDropbutton'],
],
'#theme' => 'links__dropbutton',
];
}
/**
* Pre-render callback: Attaches the dropbutton library and required markup.
*/
public static function preRenderDropbutton($element) {
$element['#attached']['library'][] = 'core/drupal.dropbutton';
$element['#attributes']['class'][] = 'dropbutton';
if (!isset($element['#theme_wrappers'])) {
$element['#theme_wrappers'] = [];
}
array_unshift($element['#theme_wrappers'], 'dropbutton_wrapper');
// Enable targeted theming of specific dropbuttons (e.g., 'operations' or
// 'operations__node').
if (isset($element['#subtype'])) {
$element['#theme'] .= '__' . $element['#subtype'];
}
return $element;
}
}