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<?php
namespace Drupal\term_reference_tree\Element;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Render\Element\CompositeFormElementTrait;
use Drupal\Core\Render\Element\FormElement;
class CheckboxTree extends FormElement {
use CompositeFormElementTrait;
public function getInfo() {
$class = get_class($this);
return [
'#input' => TRUE,
'#tree' => TRUE,
'#process' => [
[
$class,
'processCheckboxTree',
],
],
'#pre_render' => [
[
$class,
'preRenderCompositeFormElement',
],
],
'#default_value' => [],
'#attached' => [
'library' => [
'term_reference_tree/term_reference_tree_js',
'term_reference_tree/term_reference_tree_css',
],
],
'#theme' => 'checkbox_tree',
];
}
public static function processCheckboxTree(&$element, FormStateInterface $form_state, &$complete_form) {
$value = is_array($element['#value']) ? $element['#value'] : [];
$allowed = [];
$filter = FALSE;
if (!empty($element['#max_choices']) && $element['#max_choices'] != '-1') {
$element['#attached']['drupalSettings'] = [
'term_reference_tree' => [
'trees' => [
$element['#id'] => [
'max_choices' => $element['#max_choices'],
],
],
],
];
}
if (!empty($element['#allowed'])) {
$allowed = $element['#allowed'];
$filter = TRUE;
}
if (empty($element['#options'])) {
$options_tree = [];
foreach ($element['#vocabularies'] as $vocabulary) {
$options = _term_reference_tree_get_term_hierarchy(0, $vocabulary
->id(), $allowed, $filter, '', $value);
$options_tree = array_merge($options_tree, $options);
}
$element['#options_tree'] = $options_tree;
$element['#options'] = _term_reference_tree_get_options($element['#options_tree'], $allowed, $filter);
}
$terms = !empty($element['#options_tree']) ? $element['#options_tree'] : [];
$tree = new \stdClass();
$tree->children = $terms;
unset($element['#needs_validation']);
$element[] = _term_reference_tree_build_level($element, $tree, $form_state, $value, $element['#max_choices'], [], 1);
return $element;
}
public static function valueCallback(&$element, $input, FormStateInterface $form_state) {
$value = [];
$element += [
'#default_value' => [],
];
foreach ($element['#default_value'] as $key) {
if (isset($key['target_id'])) {
$value[$key['target_id']] = $key['target_id'];
}
}
return $value;
}
}