TestBoldTextBehavior.php

<?php

namespace Drupal\paragraphs_test\Plugin\paragraphs\Behavior;

use Drupal\Core\Entity\Display\EntityViewDisplayInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\paragraphs\Entity\Paragraph;
use Drupal\paragraphs\Entity\ParagraphsType;
use Drupal\paragraphs\ParagraphInterface;
use Drupal\paragraphs\ParagraphsBehaviorBase;

/**
 * Provides a test feature plugin.
 *
 * @ParagraphsBehavior(
 *   id = "test_bold_text",
 *   label = @Translation("Test bold text plugin"),
 *   description = @Translation("Test bold text plugin"),
 *   weight = 2
 * )
 */
class TestBoldTextBehavior extends ParagraphsBehaviorBase {

  /**
   * {@inheritdoc}
   */
  public function buildBehaviorForm(ParagraphInterface $paragraph, array &$form, FormStateInterface $form_state) {
    $form['bold_text'] = [
      '#type' => 'checkbox',
      '#title' => $this
        ->t('Bold Text'),
      '#default_value' => $paragraph
        ->getBehaviorSetting($this
        ->getPluginId(), 'bold_text', FALSE),
      '#description' => $this
        ->t("Bold text for the paragraph."),
    ];
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function view(array &$build, Paragraph $paragraphs_entity, EntityViewDisplayInterface $display, $view_mode) {
    if ($paragraphs_entity
      ->getBehaviorSetting($this
      ->getPluginId(), 'bold_text')) {
      $build['#attributes']['class'][] = 'bold_plugin_text';
      $build['#attached']['library'][] = 'paragraphs_test/drupal.paragraphs_test.bold_text';
    }
  }

  /**
   * {@inheritdoc}
   */
  public static function isApplicable(ParagraphsType $paragraphs_type) {

    // If the name of the field is not text_paragraph_test then allow using this
    // plugin.
    if ($paragraphs_type
      ->id() != 'text_paragraph_test') {
      return TRUE;
    }
    return FALSE;
  }

  /**
   * {@inheritdoc}
   */
  public function settingsSummary(Paragraph $paragraph) {
    $bold_setting = $paragraph
      ->getBehaviorSetting($this
      ->getPluginId(), 'bold_text');
    return [
      [
        'label' => $this
          ->t('Bold'),
        'value' => $bold_setting ? $this
          ->t('Yes') : $this
          ->t('No'),
      ],
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function settingsIcon(Paragraph $paragraph) {
    $bold_setting = $paragraph
      ->getBehaviorSetting($this
      ->getPluginId(), 'bold_text');
    if ($bold_setting) {
      return [
        'bold' => [
          '#theme' => 'paragraphs_info_icon',
          '#message' => $this
            ->t('Bold: Yes.'),
          '#icon' => 'bold',
        ],
      ];
    }
    return [];
  }

}