geolocation-8.x-3.x-dev/modules/geolocation_leaflet/src/Plugin/geolocation/MapFeature/LeafletControlScale.php

<?php

namespace Drupal\geolocation_leaflet\Plugin\geolocation\MapFeature;

use Drupal\geolocation\Attribute\MapFeature;
use Drupal\geolocation\MapProviderInterface;
use Drupal\geolocation\Plugin\geolocation\MapFeature\ControlElementBase;

/**
 * Provides Scale control element.
 */
#[MapFeature(
  id: 'leaflet_control_scale',
  name: new \Drupal\Core\StringTranslation\TranslatableMarkup('Map Control - Scale'),
  description: new \Drupal\Core\StringTranslation\TranslatableMarkup('A simple scale control that shows the scale of the current center of screen in metric (m/km) and imperial (mi/ft) systems.'),
  type: 'leaflet'
)]
class LeafletControlScale extends ControlElementBase {

  /**
   * {@inheritdoc}
   */
  public static function getDefaultSettings(): array {
    return array_replace_recursive(
      parent::getDefaultSettings(),
      [
        'metric' => TRUE,
        'imperial' => TRUE,
      ]
    );
  }

  /**
   * {@inheritdoc}
   */
  public function getSettingsForm(array $settings, array $parents = [], ?MapProviderInterface $mapProvider = NULL): array {
    $form = parent::getSettingsForm($settings, $parents, $mapProvider);

    $form['metric'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Metric'),
      '#description' => $this->t('Whether to show the metric scale line (m/km).'),
      '#default_value' => $settings['metric'],
    ];
    $form['imperial'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Imperial'),
      '#description' => $this->t('Whether to show the imperial scale line (mi/ft).'),
      '#default_value' => $settings['imperial'],
    ];

    return $form;
  }

}