graph_element-1.0.4/src/Plugin/Field/FieldWidget/GraphElementWidget.php

<?php

namespace Drupal\graph_element\Plugin\Field\FieldWidget;

use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Field\WidgetBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\graph_element\Utility;

/**
 * Plugin implementation of the 'graph_element_widget' widget.
 *
 * @FieldWidget(
 *   id = "graph_element_widget",
 *   module = "graph_element",
 *   label = @Translation("Chart Widget"),
 *   field_types = {
 *     "graph_element_item"
 *   }
 * )
 */
class GraphElementWidget extends WidgetBase {

  /**
   * {@inheritdoc}
   */
  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {

    $utility = new Utility();

    $graphResourceOptions = $utility->getGraphResources(TRUE);

    $graphTypesOptions = $utility->getGraphTypes();

    $element += [
      '#type' => 'fieldset',
      '#attributes' => [
        'class' => ['row'],
      ],
      'graph_title' => [
        '#type' => 'textfield',
        '#title' => $this->t('Chart Title'),
        '#default_value' => $items[$delta]->graph_title ?? NULL,
        '#size' => 60,
        '#maxlength' => 128,
        '#required' => FALSE,
      ],
      'graph_source' => [
        '#type' => 'select',
        '#title' => $this->t('Chart Source'),
        '#options' => $graphResourceOptions,
        '#default_value' => $items[$delta]->graph_source ?? NULL,
        '#required' => TRUE,
      ],
      'graph_type' => [
        '#type' => 'select',
        '#title' => $this->t('Chart Type'),
        '#options' => $graphTypesOptions,
        '#default_value' => $items[$delta]->graph_type ?? NULL,
        '#required' => TRUE,
      ],
      'graph_description' => [
        '#type' => 'textfield',
        '#title' => $this->t('Chart Description'),
        '#default_value' => $items[$delta]->graph_description ?? NULL,
        '#size' => 60,
        '#maxlength' => 128,
        '#required' => FALSE,
      ],
    ];

    return $element;
  }

  /**
   * Validate the video script field.
   */
  public function validate($element, FormStateInterface $form_state) {
    $graph_type = $element['#graph_type'];
    $graph_type = trim($graph_type);
    if (empty($graph_type)) {
      $form_state->setError($element, $this->t('Please select a Chart type.'));
      return;
    }
    $graph_source = $element['#graph_source'];
    $graph_source = trim($graph_source);
    if (empty($graph_source)) {
      $form_state->setError($element, $this->t('Please select a Chart source.'));
      return;
    }
    $graph_title = $element['#graph_title'];
    $graph_description = $element['#graph_description'];

    $form_state->setValueForElement($element, $graph_type);
    $form_state->setValueForElement($element, $graph_source);
    $form_state->setValueForElement($element, $graph_title);
    $form_state->setValueForElement($element, $graph_description);
  }

}