improvements-2.x-dev/modules/improvements_paragraphs/src/Plugin/paragraphs/Behavior/StyleSelectorParagraphBehavior.php

<?php

namespace Drupal\improvements_paragraphs\Plugin\paragraphs\Behavior;

use Drupal\Component\Serialization\Yaml;
use Drupal\Core\Entity\Display\EntityViewDisplayInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Render\Element\Checkboxes;
use Drupal\Core\Template\AttributeHelper;
use Drupal\druhels\ArrayHelper;
use Drupal\paragraphs\Entity\Paragraph;
use Drupal\paragraphs\ParagraphInterface;
use Drupal\paragraphs\ParagraphsBehaviorBase;

/**
 * @ParagraphsBehavior(
 *   id = "style_selector",
 *   label = @Translation("Style selector"),
 *   description = @Translation("Allows to select paragraph style from predefined list."),
 *   weight = 103,
 * )
 */
class StyleSelectorParagraphBehavior extends ParagraphsBehaviorBase {

  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration(): array {
    return [
      'styles' => [],
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function buildConfigurationForm(array $form, FormStateInterface $form_state): array {
    $form['styles'] = [
      '#type' => 'textarea',
      '#title' => $this->t('Styles'),
      '#description' => $this->t('Styles in YAML format. Example:') . '
        <br />
        <code>
          <pre>' .
            <<<CODE
            dark:
              name: Dark paragraph
              attributes:
                class: dark-paragraph
              custom_setting_name: custom_setting_value
            CODE .
          '</pre>
        </code>
      ',
      '#default_value' => $this->configuration['styles'] ? Yaml::encode($this->configuration['styles']) : '',
      '#rows' => 10,
    ];

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function validateConfigurationForm(array &$form, FormStateInterface $form_state): void {
    try {
      Yaml::decode($form_state->getValue('styles'));
    }
    catch (\Exception $exception) {
      $form_state->setErrorByName('styles', $exception->getMessage());
    }
  }

  /**
   * {@inheritdoc}
   */
  public function submitConfigurationForm(array &$form, FormStateInterface $form_state): void {
    $this->configuration['styles'] = Yaml::decode($form_state->getValue('styles'));
  }

  /**
   * {@inheritdoc}
   */
  public function buildBehaviorForm(ParagraphInterface $paragraph, array &$form, FormStateInterface $form_state): array {
    $styles_options = [];
    foreach ($this->configuration['styles'] as $style_id => $style) {
      $styles_options[$style_id] = $style['name'];
    }

    $form['styles'] = [
      '#type' => 'checkboxes',
      '#title' => $this->t('Style'),
      '#options' => $styles_options,
      '#default_value' => $paragraph->getBehaviorSetting($this->pluginId, 'styles', []),
    ];

    $form['#weight'] = $this->pluginDefinition['weight'];

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function submitBehaviorForm(ParagraphInterface $paragraph, array &$form, FormStateInterface $form_state): void {
    $filtered_values = $this->filterBehaviorFormSubmitValues($paragraph, $form, $form_state);
    $styles = !empty($filtered_values['styles']) ? Checkboxes::getCheckedCheckboxes($filtered_values['styles']) : [];
    $paragraph->setBehaviorSettings($this->pluginId, ['styles' => $styles]);
  }

  /**
   * {@inheritDoc}
   */
  public function view(array &$build, Paragraph $paragraph, EntityViewDisplayInterface $display, $view_mode): void {
    $all_behavior_settings = $paragraph->getAllBehaviorSettings(); // Not used getBehaviorSetting() for increase performance
    $selected_styles = $all_behavior_settings[$this->pluginId]['styles'] ?? [];

    $build['#paragraph_styles'] = ArrayHelper::removeExtraElements($this->configuration['styles'], $selected_styles);

    $build['#attributes'] = $build['#attributes'] ?? [];
    foreach ($selected_styles as $style_id) {
      if ($style_attributes = $this->configuration['styles'][$style_id]['attributes'] ?? NULL) {
        $build['#attributes'] = AttributeHelper::mergeCollections(
          $build['#attributes'],
          ArrayHelper::formatArrayAsAttributes($style_attributes)
        );
      }
    }
  }

}