Swiper.php

<?php
/**
 * Created by PhpStorm.
 * User: Lex
 * Date: 20.02.2018
 * Time: 15:32
 */

namespace Drupal\ifmo\Plugin\views\style;

use Drupal\core\form\FormStateInterface;
use Drupal\views\Plugin\views\style\DefaultStyle;
use Drupal\views\Plugin\views\style\StylePluginBase;

/**
 * Style plugin to render a list of years and months
 * in reverse chronological order linked to content.
 *
 * @ingroup views_style_plugins
 *
 * @ViewsStyle(
 *   id = "ifmo_swiper",
 *   title = @Translation("Swiper"),
 *   help = @Translation("Render a swiper slider."),
 *   theme = "views_view_swiper",
 *   display_types = { "normal" }
 * )
 */
class Swiper extends DefaultStyle {

  /**
   * @inheritDoc
   */
  protected function defineOptions() {
    $options = parent::defineOptions();
    $options['swiper_name'] = ['default' => 'swiper-default'];
    $options['library'] = ['default'=> 'ifmo/swiper-views'];
    $options['swiper'] = ['default' => [
      'overflow' => FALSE,
      'pagination' => FALSE,
      'scrollbar' => FALSE,
      'navigation' => FALSE,
      'slides_per_view' => 1,
    ]];

    return $options;
  }

  /**
   * @inheritDoc
   */
  public function buildOptionsForm(&$form, FormStateInterface $form_state) {
    parent::buildOptionsForm($form, $form_state);

    // Extra CSS classes.
    $form['swiper_name'] = [
      '#type' => 'textfield',
      '#title' => t('CSS classes'),
      '#default_value' => (isset($this->options['swiper_name'])) ? $this->options['swiper_name'] : 'view-swip',
      '#description' => t('CSS classes for customization slider.'),
    ];
    $form['library'] = [
      '#type' => 'textfield',
      '#title' => t('Library'),
      '#default_value' => (isset($this->options['library'])) ? $this->options['library'] : 'ifmo/swiper-views',
      '#description' => t('Attach library.'),
    ];

    $form['swiper'] = [
      '#type' => 'fieldset',
      '#tree' => TRUE,
      '#title' => $this->t('Swiper settings')
    ];

    $form['swiper']['overflow'] = [
      '#type' => 'checkbox',
      '#title' => 'Overflow',
      '#default_value' => (isset($this->options['swiper']['overflow'])) ? $this->options['swiper']['overflow'] : FALSE,
    ];
    $form['swiper']['pagination'] = [
      '#type' => 'checkbox',
      '#title' => 'Pagination',
      '#default_value' => (isset($this->options['swiper']['pagination'])) ? $this->options['swiper']['pagination'] : FALSE,
    ];
    $form['swiper']['scrollbar'] = [
      '#type' => 'checkbox',
      '#title' => 'Scrollbar',
      '#default_value' => (isset($this->options['swiper']['scrollbar'])) ? $this->options['swiper']['scrollbar'] : FALSE,
    ];
    $form['swiper']['navigation'] = [
      '#type' => 'checkbox',
      '#title' => 'Navigation',
      '#default_value' => (isset($this->options['swiper']['navigation'])) ? $this->options['swiper']['navigation'] : FALSE,
    ];

    $form['swiper']['slides_per_view'] = [
      '#type' => 'number',
      '#title' => $this->t('Slides per view'),
      '#min' => 1,
      '#step' => 1,
      '#default_value' => (isset($this->options['swiper']['slides_per_view'])) ? $this->options['swiper']['slides_per_view'] : 1,
    ];
  }


}