leaflet_geojson.module in Leaflet GeoJSON 8

API Extension for using Leaflet with GeoJSON.

It currently just allows to add a bbox strategy.

File

leaflet_geojson.module

<?php

/**
 * @file
 * API Extension for using Leaflet with GeoJSON.
 *
 * It currently just allows to add a bbox strategy.
 */
use Drupal\views\Views;
use Drupal\Core\Url;
use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_theme().
 */
function leaflet_geojson_theme() {
  return [
    'leafletgeojson_map' => [
      'variables' => [
        'map_id' => NULL,
        'height' => '400px',
      ],
    ],
  ];
}

/**
 * Retrieves the leaflet layer configuration.
 */
function leaflet_geojson_source_get_info($source = NULL, $skip_cache = FALSE) {
  $language = \Drupal::languageManager()
    ->getCurrentLanguage();
  $lang = $language
    ->getId();
  if (!$skip_cache) {
    static $drupal_static_fast;
    if (!isset($drupal_static_fast)) {
      $drupal_static_fast['leaflet_geojson_source_info'] =& drupal_static(__FUNCTION__);
    }
    $source_info =& $drupal_static_fast['leaflet_geojson_source_info'];
    if (!isset($source_info[$lang])) {
      if ($cache = \Drupal::cache()
        ->get("leaflet_geojson_source_info")) {
        $source_info = $cache->data;
      }
    }
  }
  if (empty($source_info[$lang])) {
    $options = array(
      'language' => $language,
    );
    $source_info_lang = Drupal::moduleHandler()
      ->invokeAll('leaflet_geojson_source_info', $options);

    // Let other modules alter the source info.
    Drupal::moduleHandler()
      ->alter('leaflet_geojson_source_info', $source_info_lang);
    $source_info[$lang] = $source_info_lang;
    \Drupal::cache()
      ->set("leaflet_geojson_source_info", $source_info);
  }
  if (empty($source)) {
    return $source_info[$lang];
  }
  elseif (isset($source_info[$lang][$source])) {
    return $source_info[$lang][$source];
  }
}

/**
 * Implements hook_leaflet_geojson_source_info().
 */
function leaflet_geojson_leaflet_geojson_source_info($language) {
  $sources = [];
  $views = Views::getEnabledViews();
  foreach ($views as $view) {
    foreach ($view
      ->get('display') as $display_name => $display) {

      // Make GeoJSON sources from the views_geojson module.
      if ($display['display_plugin'] == 'geojson_export') {
        $display_title = '(' . $display_name . ')';
        if (!empty($display['display_title'])) {
          $display_title = $display['display_title'] . ' ' . $display_title;
        }
        $title = $view
          ->label() . ' - ' . $display_title;
        $source = [
          'id' => $view
            ->get('id') . '_' . $display_name,
          'title' => $title,
          'type' => 'views_geojson',
          'url' => Url::fromRoute('view.' . $view
            ->id() . '.' . $display_name, array(), array(
            'language' => $language,
          ))
            ->toString(),
        ];

        // Determine if we should use a BBox strategy.
        $arguments = isset($display['display_options']['arguments']) ? $display['display_options']['arguments'] : NULL;

        // If null, it means we are using the default view's arguments.
        if (is_null($arguments)) {
          $defaultDisplay = $view
            ->getDisplay('default');
          $arguments = $defaultDisplay['display_options']['arguments'];
        }
        if (isset($arguments['bbox_argument']) && $arguments['bbox_argument']['default_argument_type'] == 'bboxquery') {
          $source['bbox'] = TRUE;
          if (isset($arguments['bbox_argument']['default_argument_options'])) {
            $source['bbox_arg_id'] = $arguments['bbox_argument']['default_argument_options']['arg_id'];
          }
        }

        // Custom views_geojson attributes.
        $source['view'] = $view
          ->get('id');
        $source['view_display'] = $display;
        $sources[$source['id']] = $source;
      }
    }
  }
  return $sources;
}

/**
 * Helper function to add another views_geojson layer to the map data.
 */
function leaflet_geojson_map_pane_add_layer($form, &$form_state) {

  // Increment the count and force a rebuild.
  $form_state
    ->set('layer_count', $form_state
    ->get('layer_count') + 1);
  $form_state
    ->setRebuild();
}

/**
 * Helper function to remove the last views_geojson layer from the map.
 */
function leaflet_geojson_map_pane_remove_last_layer($form, &$form_state) {

  // Decrement the count and force a rebuild.
  $form_state
    ->set('layer_count', $form_state
    ->get('layer_count') - 1);
  $form_state
    ->setRebuild();
}

/**
 * Implements hook_help().
 */
function leaflet_geojson_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.leaflet_geojson':
      $text = file_get_contents(__DIR__ . '/README.txt');
      return $text;
  }
  return NULL;
}

Functions

Name	Description
leaflet_geojson_help	Implements hook_help().
leaflet_geojson_leaflet_geojson_source_info	Implements hook_leaflet_geojson_source_info().
leaflet_geojson_map_pane_add_layer	Helper function to add another views_geojson layer to the map data.
leaflet_geojson_map_pane_remove_last_layer	Helper function to remove the last views_geojson layer from the map.
leaflet_geojson_source_get_info	Retrieves the leaflet layer configuration.
leaflet_geojson_theme	Implements hook_theme().