added term_reference_tree contrib module

web/modules/dev/term_reference_tree/src/Element/CheckboxTree.php

@@ -0,0 +1,99 @@
+<?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']);
+    $element[] = _term_reference_tree_build_level($element, $tree, $form_state, $value, $element['#max_choices'], [], 1);
+    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;
+  }
+
+}

web/modules/dev/term_reference_tree/src/Element/CheckboxTreeItem.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Drupal\term_reference_tree\Element;
+
+use Drupal\Core\Render\Element\FormElement;
+
+/**
+ * Provides a form element for term reference tree.
+ *
+ * @FormElement("checkbox_tree_item")
+ */
+class CheckboxTreeItem extends FormElement {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getInfo() {
+    return array(
+      '#input' => FALSE,
+      '#theme' => 'checkbox_tree_item',
+    );
+  }
+
+}

web/modules/dev/term_reference_tree/src/Element/CheckboxTreeLabel.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Drupal\term_reference_tree\Element;
+
+use Drupal\Core\Render\Element\FormElement;
+
+/**
+ * Provides a form element for term reference tree.
+ *
+ * @FormElement("checkbox_tree_label")
+ */
+class CheckboxTreeLabel extends FormElement {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getInfo() {
+    return array(
+      '#input' => FALSE,
+      '#theme' => 'checkbox_tree_label',
+    );
+  }
+
+}

web/modules/dev/term_reference_tree/src/Element/CheckboxTreeLevel.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Drupal\term_reference_tree\Element;
+
+use Drupal\Core\Render\Element\FormElement;
+
+/**
+ * Provides a form element for term reference tree.
+ *
+ * @FormElement("checkbox_tree_level")
+ */
+class CheckboxTreeLevel extends FormElement {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getInfo() {
+    return array(
+      '#input' => FALSE,
+      '#theme' => 'checkbox_tree_level',
+    );
+  }
+
+}