Rework leaflet dca callbacks to a listener service.

src/Listener/Dca/LeafletDcaListener.php

@@ -0,0 +1,117 @@
+<?php
+
+/**
+ * Leaflet maps for Contao CMS.
+ *
+ * @package    contao-leaflet-maps
+ * @author     David Molineus <david.molineus@netzmacht.de>
+ * @copyright  2016-2017 netzmacht David Molineus. All rights reserved.
+ * @license    LGPL-3.0 https://github.com/netzmacht/contao-leaflet-maps/blob/master/LICENSE
+ * @filesource
+ */
+
+namespace Netzmacht\Contao\Leaflet\Listener\Dca;
+
+use Contao\DataContainer;
+use Netzmacht\Contao\Leaflet\Model\LayerModel;
+use Netzmacht\LeafletPHP\Value\LatLng;
+use Symfony\Component\Filesystem\Filesystem;
+
+/**
+ * Class Leaflet is the base helper providing different methods.
+ *
+ * @package Netzmacht\Contao\Leaflet\Dca
+ */
+class LeafletDcaListener
+{
+    /**
+     * File system.
+     *
+     * @var Filesystem
+     */
+    private $fileSystem;
+
+    /**
+     * Cache dir.
+     *
+     * @var string
+     */
+    private $cacheDir;
+
+    /**
+     * LeafletCallbacks constructor.
+     *
+     * @param Filesystem $fileSystem File system.
+     * @param string     $cacheDir   Cache dir.
+     */
+    public function __construct(Filesystem $fileSystem, string $cacheDir)
+    {
+        $this->fileSystem = $fileSystem;
+        $this->cacheDir   = $cacheDir;
+    }
+
+    /**
+     * Create the zoom range.
+     *
+     * @return array
+     */
+    public function getZoomLevels()
+    {
+        return range(1, 20);
+    }
+
+    /**
+     * Get the geocoder wizard.
+     *
+     * @param DataContainer $dataContainer The dataContainer driver.
+     *
+     * @return string
+     */
+    public function getGeocoder($dataContainer)
+    {
+        $template        = new \BackendTemplate('be_leaflet_geocode');
+        $template->field = 'ctrl_' . $dataContainer->field;
+
+        try {
+            $latLng           = LatLng::fromString($dataContainer->value);
+            $template->marker = json_encode($latLng);
+        } catch (\Exception $e) {
+            // LatLng throws an exception of value could not be created. Just let the value empty when.
+        }
+
+        return $template->parse();
+    }
+
+    /**
+     * Get all layers.
+     *
+     * @return array
+     */
+    public function getLayers()
+    {
+        $options    = array();
+        $collection = LayerModel::findBy('pid', '0', array('order' => 'title'));
+
+        if ($collection) {
+            foreach ($collection as $model) {
+                $options[$model->id] = $model->title;
+            }
+        }
+
+        return $options;
+    }
+
+    /**
+     * Clear the leaflet cache.
+     *
+     * @param mixed $value Value when used as save_callback.
+     *
+     * @return mixed
+     */
+    public function clearCache($value = null)
+    {
+        $this->fileSystem->remove($this->cacheDir);
+
+        return $value;
+    }
+}