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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;
- /**
- * Provides a form element for term reference tree.
- *
- * @FormElement("checkbox_tree")
- */
- class CheckboxTree extends FormElement {
- use CompositeFormElementTrait;
- /**
- * {@inheritdoc}
- */
- 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',
- ];
- }
- /**
- * Processes a checkboxes form element.
- */
- 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']);
- $element['checkbox_tree'] = _term_reference_tree_build_level($element, $tree, $form_state, $value, $element['#max_choices'], [], 1);
- // track list
- if ($element['#track_list']) {
- if($form_state->getTriggeringElement()){
- // we are on ajax
- // $value is not updated on ajax callback
- // we need an other way to get wich options are checked
- // and give an accurate track list
- $parent = $element['#parents'][0]; // get the element's parent field
- $input = $form_state->getUserInput(); // get all inputs from form state
- $checkbox_tree_input = $input[$parent]['checkbox_tree']; // get the chekbox_tree input
- $selected = _term_reference_tree_get_flatten_selected_values($checkbox_tree_input); // get selected flattenized
- $track_list_input = $input[$parent]['track_list']; // get the current track_list input with correct order
- $old_list = array_keys($track_list_input); // flattenize
- // remove all chebox_tree input unselected from the list
- $list = [];
- foreach ($old_list as $id) {
- if(in_array($id, $selected)){
- $list[] = $id;
- }
- }
- // append newly selected
- $diff = array_diff($selected, $list);
- foreach ($diff as $id) {
- $list[] = $id;
- }
- }else{
- // if not ajax just get the default value
- $list = $value;
- }
- // build the track_list form element
- $element['track_list'] = _term_reference_tree_build_track_list_order($list, $element['#options']);
- }
- return $element;
- }
- /**
- * {@inheritdoc}
- */
- public static function valueCallback(&$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;
- }
- }
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