leaflet_widget.module

<?php

/**
 * Implements hook_field_widget_info().
 */
function leaflet_widget_field_widget_info() {
  $widgets = array();

  $base_layers = leaflet_widget_base_layers();
  $urls = array_keys($base_layers);

  $widgets['leaflet_widget_widget'] = array(
    'label' => 'Leaflet.widget',
    'description' => 'Provides a map powered by Leaflet and Leaflet.widget.',
    'field types' => array('geofield'),
    'settings' => array(
      'map' => array(
        'base_url' => array_shift($urls),
        'center' => array(
          'lat' => 0.0,
          'lng' => 0.0
        ),
        'auto_center' => TRUE,
        'zoom' => 10,
      ),
      'toggle' => '',
      'geographic_areas' => FALSE,
      'draw' => array(
        'tools' => array(
          'polyline' => TRUE,
          'polygon' => TRUE,
          'rectangle' => TRUE,
          'circle' => TRUE,
          'marker' => TRUE,
        ),
      ),
    ),
    'behaviors' => array(
      'multiple values' => FIELD_BEHAVIOR_CUSTOM,
      'default value' => FIELD_BEHAVIOR_NONE,
    ),
  );

  return $widgets;
}

/**
 * Implements hook_field_widget_settings_form().
 */
function leaflet_widget_field_widget_settings_form($field, $instance) {
  $form = array();
  $settings = $instance['widget']['settings'];

  switch ($instance['widget']['type']) {
    case 'leaflet_widget_widget':
      $form['map'] = array(
        '#type' => 'fieldset',
        '#title' => t('Default map settings'),
      );
      $form['map']['base_url'] = array(
        '#type' => 'select',
        '#title' => t('Leaflet.draw widget settings'),
        '#default_value' => $settings['map']['base_url'],
        '#options' => leaflet_widget_base_layers(),
      );
      $form['map']['center'] = array('#type' => 'fieldset', '#collapsed' => TRUE, '#collapsible' => TRUE, '#title' => 'Default map center');
      $form['map']['center']['lat'] = array(
        '#type' => 'textfield', // 'hidden',
        '#title' => t('Latitude'),
        '#default_value' => $settings['map']['center']['lat'],
        '#required' => TRUE,
      );
      $form['map']['center']['lng'] = array(
        '#type' => 'textfield', // 'hidden',
        '#title' => t('Longtitude'),
        '#default_value' => $settings['map']['center']['lng'],
        '#required' => TRUE,
      );
      $form['map']['auto_center'] = array(
        '#type' => 'checkbox',
        '#title' => t('Automatically center map on existing features'),
        '#description' => t("This option overrides the widget's default center."),
        '#default_value' => $settings['map']['auto_center'],
      );
      $form['map']['zoom'] = array(
        '#type' => 'textfield', // 'hidden',
        '#title' => t('Default zoom level'),
        '#default_value' => $settings['map']['zoom'],
        '#required' => TRUE,
      );
      $form['toggle'] = array(
        '#type' => 'checkbox',
        '#title' => t('Allow users option to input values directly.'),
        '#description' => t('When checked this option allows users to add to input form directly instead of using the map (geojson or point).'),
        '#default_value' => $settings['toggle'],
      );
      $form['geographic_areas'] = array(
        '#type' => 'checkbox',
        '#title' => t('Allow users use a predefined geographic areas'),
        '#description' => t('Show a select list on the top with predefined areas'),
        '#default_value' => $settings['geographic_areas'],
      );
      $form['draw'] = array(
        '#type' => 'fieldset',
        '#title' => 'Default Leaflet.draw settings',
      );
      $options = array(
        'polyline' => t('Polyline'),
        'polygon' => t('Polygon'),
        'rectangle' => t('Rectangle'),
        'circle' => t('Circle'),
        'marker' => t('Marker'),
      );
      $form['draw']['tools'] = array(
        '#type' => 'checkboxes',
        '#title' => t('Tools to include on the map.'),
        '#description' => t('Decide which tools you want to add. Defaults to all.'),
        '#default_value' => $settings['draw']['tools'],
        '#options' => $options,
      );

      break;

  }

  return $form;
}

/**
 * Implements hook_field_widget_form().
 */
function leaflet_widget_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {
  $settings = $instance['widget']['settings'];

  $widget = geofield_get_base_element($element, $items, $delta);
  $widget['#type'] = 'fieldset';
  // Geofield adds its own description even though #description is available.
  unset($widget['description']);

  switch ($instance['widget']['type']) {
    case 'leaflet_widget_widget':
      $id = 'leaflet-widget_' . str_replace('_', '-', $instance['field_name']);
      $class = 'leaflet-widget';
      $style = 'height: 300px;';

      $settings['map']['widget'] = array();
      $settings['map']['widget']['attach'] = "$id-input";
      $settings['map']['widget']['multiple'] = FALSE;
      $settings['map']['widget']['autoCenter'] = $settings['map']['auto_center'];
      if ($field['cardinality'] != 1) {
        $settings['map']['widget']['multiple'] = TRUE;
        // Leaflet.widget treats multiple == true && !cardinality as 'unlimited'.
        $settings['map']['widget']['cardinality'] = $field['cardinality'] > 0 ? $field['cardinality'] : 0;
      }

      // Provide container markup for map form element.
      $container = "<div id=\"$id\" class=\"$class\" style=\"$style\"></div>";
      $widget['leaflet_widget'] = array('#markup' => $container);

      // Overriding Geofield's validation handler.
      $widget['#element_validate'] = array('leaflet_widget_widget_validate');

      // Tell Geofield to expect GeoJSON instead of WKT.
      $widget['input_format']['#value'] = 'geojson';

      // Prepare existing field values to be rendered in widget.
      $collection = leaflet_widget_widget_prepare_items($items);

      // Set default value incase form is submitted without javascript enabled.
      $widget['wkt']['#default_value'] = drupal_json_encode($collection);
      $widget['wkt']['#attributes']['id'] = $settings['map']['widget']['attach'];

      // Include javascript.
      $widget['#attached']['library'][] = array('leaflet_widget', 'draw');
      $widget['#attached']['library'][] = array('system', 'ui.tabs');

      //Check if we need to add geographic areas
      if (isset($settings['geographic_areas']) && $settings['geographic_areas']) {
        //TODO: Add documentation about this hook.
        $areas = module_invoke_all('leaflet_widget_geographic_areas');
        $settings['areas'] = $areas;
      }

      // Settings and geo-data are passed to the widget keyed by field id.
      $widget['#attached']['js'][] = array(
        'type' => 'setting',
        'data' => array('leaflet_widget_widget' => array($id => $settings)),
      );

      // Add JSON utility js.
      $widget['#attached']['js'][] = array(
        'type' => 'file',
        'data' => drupal_get_path('module', 'leaflet_widget') . '/js/json2.min.js',
      );
      break;
  }

  return $widget;
}

function leaflet_widget_widget_prepare_items($items) {
  $features = array();
  foreach ($items as $item) {
    if (isset($item['wkt'])) {
      $features[] = leaflet_widget_geojson_feature($item['wkt']);
    }
  }
  return leaflet_widget_geojson_feature_collection($features);
}

function leaflet_widget_widget_validate($element, &$form_state) {
  $geophp = geophp_load();
  if (!$geophp) return FALSE;

  //Validate json type is valid.
  $geojson = json_decode($element['wkt']['#value']);
  $types = array('FeatureCollection', 'GeometryCollection', 'Feature', 'Point', 'MultiPoint', 'LineString', 'MultiLineString', 'Polygon', 'MultiPolygon');

  $results = array();
  if ($geojson) {
    //Validate type
    if (!in_array($geojson->type, $types)) {
      form_set_error($element['wkt']['#name'], 'Please enter valid GeoJSON');
      return FALSE;
    }

    //validate structure
    try {
      $geometry = geoPHP::load($element['wkt']['#value'], 'json');
      $geometry->out('wkt');
    }
    catch (Exception $e) {
      form_set_error($element['wkt']['#name'], 'Please enter valid GeoJSON');
      return FALSE;
    }

    if ($geojson->type === 'FeatureCollection') {
      foreach ($geojson->features as $feature) {
        $results[] = array_merge($results, leaflet_widget_process_geojson($feature));
      }
    }
    else {
      $results = array(leaflet_widget_process_geojson($geojson));
    }
  }
  else {
    $results = array();
  }

  form_set_value($element, $results, $form_state);
}

function leaflet_widget_process_geojson($geojson) {
  $geom = geoPHP::load($geojson, 'json');
  $type = $geom->geometryType();
  $result = array('wkt' => $geom->out('wkt'));
  geofield_compute_values($result, 'wkt');
  return $result;
}

/**
 * Implements hook_library().
 */
function leaflet_widget_library() {
  $path = drupal_get_path('module', 'leaflet_widget');
  $leaflet_draw = libraries_get_path('leaflet_draw');
  $leaflet = libraries_get_path('leaflet');

  $libraries = array();

  $libraries['draw'] = array(
    'title' => 'Widget behavior',
    'version' => '1.x',
    'js' => array(
      "$path/js/draw.js" => array(),
    ),
    'dependencies' => array(
      array('leaflet_widget', 'leaflet_draw'),
    ),
  );

  $libraries['leaflet_draw'] = array(
    'title' => 'Leaflet.draw',
    'version' => '0.4.7',
    'css' => array(
      "$leaflet_draw/dist/leaflet.draw.css" => array(),
    ),
    'js' => array(
      "$leaflet_draw/dist/leaflet.draw.js" => array(),
    ),
    'dependencies' => array(
      array('leaflet_widget', 'leaflet'),
    ),
  );

  $leaflet_image_path = $leaflet . '/dist/images/';
  $libraries['leaflet'] = array(
    'title' => 'Leaflet (Leaflet Widget)',
    'version' => '1.0.2',
    'css' => array(
      "$leaflet/dist/leaflet.css" => array(),
    ),
    'js' => array(
      "$leaflet/dist/leaflet.js" => array(),
      'if (!L.Icon.Default.imagePath) L.Icon.Default.imagePath = "/' . $leaflet_image_path . '"' => array('type' => 'inline'),
    ),
  );

  return $libraries;
}

function leaflet_widget_geojson_feature_collection($features, $properties = array()) {
  if (!is_array($features)) {
    $features = array($features);
  }

  return array(
    'type' => 'FeatureCollection',
    'features' => $features,
  );
}

function leaflet_widget_geojson_feature($wkt, $properties = array()) {
  $geophp = geophp_load();
  if (!$geophp) return FALSE;

  $geometry = geoPHP::load($wkt, 'wkt');
  return array(
    'type' => 'Feature',
    'geometry' => json_decode($geometry->out('json')),
    'properties' => $properties,
  );
}

/**
 * Implements hook_leaflet_widget_base_layers().
 */
function leaflet_widget_leaflet_widget_base_layers() {
  return array(
    '//{s}.tile.openstreetmap.org/{z}/{x}/{y}.png' => 'OSM Mapnik',
  );
}

function leaflet_widget_base_layers() {
  $options = array();

  if (module_exists('leaflet')) {
    foreach (leaflet_map_get_info() as $id => $map) {
      foreach ($map['layers'] as $layer_id => $layer) {
        $options[$layer['urlTemplate']] = "$id - $layer_id";
      }
    }
  }

  return array_merge($options, module_invoke_all('leaflet_widget_base_layers'));
}