Implement marker cluster.

assets/maps/contao-leaflet.js

@@ -1 +1 @@
-L.Contao=L.Class.extend({includes:L.Mixin.Events,attribution:' | <a href="http://contao-leaflet.netzmacht.de/" title="Leaflet extension for Contao CMS">netzmacht <em>creative</em></a>',maps:{},icons:{},initialize:function(){L.Icon.Default.imagePath="assets/leaflet/libs/leaflet/images",this.setGeoJsonListeners(L.GeoJSON)},addMap:function(t,e){return e.map.attributionControl.setPrefix(e.map.attributionControl.options.prefix+this.attribution),this.maps[t]=e,this.fire("map:added",{id:t,map:e}),this},getMap:function(t){return"undefined"==typeof this.maps[t]?null:this.maps[t]},addIcon:function(t,e){return this.icons[t]=e,this.fire("icon:added",{id:t,icon:e}),this},loadIcons:function(t){for(var e=0;e<t.length;e++){var n=L[t[e].type](t[e].options);this.addIcon(t[e].id,n)}},getIcon:function(t){return"undefined"==typeof this.icons[t]?null:this.icons[t]},load:function(t,e,n,o,i){var s=this.createRequestUrl(t),r=omnivore[e](s,n,o);return i&&(L.stamp(r),i.fire("dataloading",{layer:r}),r.on("ready",function(){i.calculateFeatureBounds(r),i.fire("dataload",{layer:r})}),r.on("error",function(){i.fire("dataload",{layer:r})})),r},pointToLayer:function(t,e){var n="marker",o=null;if(t.properties&&(t.properties.bounds=!0,t.properties.type&&(n=t.properties.type),t.properties.arguments&&(o=L[n].apply(L[n],t.properties.arguments),L.Util.setOptions(o,t.properties.options))),null===o&&(o=L[n](e,t.properties.options)),t.properties){if(t.properties.radius&&o.setRadius(t.properties.radius),t.properties.icon){var i=this.getIcon(t.properties.icon);i&&o.setIcon(i)}this.bindPopupFromFeature(o,t)}return this.fire("point:added",{marker:o,feature:t,latlng:e,type:n}),o},onEachFeature:function(t,e){t.properties&&(L.Util.setOptions(e,t.properties.options),this.bindPopupFromFeature(e,t),this.fire("feature:added",{feature:t,layer:e}))},bindPopupFromFeature:function(t,e){e.properties&&(e.properties.popup?t.bindPopup(e.properties.popup):e.properties.popupContent&&t.bindPopup(e.properties.popupContent))},setGeoJsonListeners:function(t){t&&t.prototype&&(t.prototype.options={pointToLayer:this.pointToLayer.bind(this),onEachFeature:this.onEachFeature.bind(this)})},createRequestUrl:function(t){t=encodeURIComponent(t);var e="leaflet",n=document.location.search.substr(1).split("&");if(""==n)return document.location.pathname+"?"+[e,t].join("=");for(var o,i=n.length;i--;)if(o=n[i].split("="),o[0]==e){o[1]=t,n[i]=o.join("=");break}return 0>i&&(n[n.length]=[e,t].join("=")),document.location.pathname+n.join("&")}}),L.contao=new L.Contao,L.Map.include({_dynamicBounds:null,calculateFeatureBounds:function(t,e){if(t){if(!this.options.adjustBounds&&!e)return;this._scanForBounds(t)}else this.eachLayer(this._scanForBounds,this);this._dynamicBounds&&this.fitBounds(this._dynamicBounds)},_scanForBounds:function(t){var e;t.feature&&t.feature.properties&&t.feature.properties.affectBounds?t.getBounds?(e=t.getBounds(),e.isValid()&&(this._dynamicBounds?this._dynamicBounds.extend(e):this._dynamicBounds=L.latLngBounds(e.getSouthWest(),e.getNorthEast()))):t.getLatLng&&(e=t.getLatLng(),this._dynamicBounds?this._dynamicBounds.extend(e):this._dynamicBounds=L.latLngBounds(e,e)):t.eachLayer&&t.eachLayer(this._scanForBounds,this)}});
+L.Contao=L.Class.extend({includes:L.Mixin.Events,attribution:' | <a href="http://contao-leaflet.netzmacht.de/" title="Leaflet extension for Contao CMS">netzmacht <em>creative</em></a>',maps:{},icons:{},initialize:function(){L.Icon.Default.imagePath="assets/leaflet/libs/leaflet/images",this.setGeoJsonListeners(L.GeoJSON)},addMap:function(t,e){return e.map.attributionControl.setPrefix(e.map.attributionControl.options.prefix+this.attribution),this.maps[t]=e,this.fire("map:added",{id:t,map:e}),this},getMap:function(t){return"undefined"==typeof this.maps[t]?null:this.maps[t]},addIcon:function(t,e){return this.icons[t]=e,this.fire("icon:added",{id:t,icon:e}),this},loadIcons:function(t){for(var e=0;e<t.length;e++){var n=L[t[e].type](t[e].options);this.addIcon(t[e].id,n)}},getIcon:function(t){return"undefined"==typeof this.icons[t]?null:this.icons[t]},load:function(t,e,n,o,i){var s=this.createRequestUrl(t),r=omnivore[e](s,n,o);return i&&(L.stamp(r),i.fire("dataloading",{layer:r}),r.on("ready",function(){i.calculateFeatureBounds(r),i.fire("dataload",{layer:r})}),r.on("error",function(){i.fire("dataload",{layer:r})})),r},pointToLayer:function(t,e){var n="marker",o=null;if(t.properties&&(t.properties.bounds=!0,t.properties.type&&(n=t.properties.type),t.properties.arguments&&(o=L[n].apply(L[n],t.properties.arguments),L.Util.setOptions(o,t.properties.options))),null===o&&(o=L[n](e,t.properties.options)),t.properties){if(t.properties.radius&&o.setRadius(t.properties.radius),t.properties.icon){var i=this.getIcon(t.properties.icon);i&&o.setIcon(i)}this.bindPopupFromFeature(o,t)}return this.fire("point:added",{marker:o,feature:t,latlng:e,type:n}),o},onEachFeature:function(t,e){t.properties&&(L.Util.setOptions(e,t.properties.options),this.bindPopupFromFeature(e,t),this.fire("feature:added",{feature:t,layer:e}))},bindPopupFromFeature:function(t,e){e.properties&&t.bindPopup&&(e.properties.popup?t.bindPopup(e.properties.popup):e.properties.popupContent&&t.bindPopup(e.properties.popupContent))},setGeoJsonListeners:function(t){t&&t.prototype&&(t.prototype.options={pointToLayer:this.pointToLayer.bind(this),onEachFeature:this.onEachFeature.bind(this)})},createRequestUrl:function(t){t=encodeURIComponent(t);var e="leaflet",n=document.location.search.substr(1).split("&");if(""==n)return document.location.pathname+"?"+[e,t].join("=");for(var o,i=n.length;i--;)if(o=n[i].split("="),o[0]==e){o[1]=t,n[i]=o.join("=");break}return 0>i&&(n[n.length]=[e,t].join("=")),document.location.pathname+n.join("&")}}),L.contao=new L.Contao,L.Map.include({_dynamicBounds:null,calculateFeatureBounds:function(t,e){if(t){if(!this.options.adjustBounds&&!e)return;this._scanForBounds(t)}else this.eachLayer(this._scanForBounds,this);this._dynamicBounds&&this.fitBounds(this._dynamicBounds)},_scanForBounds:function(t){var e;t.feature&&t.feature.properties&&t.feature.properties.affectBounds?t.getBounds?(e=t.getBounds(),e.isValid()&&(this._dynamicBounds?this._dynamicBounds.extend(e):this._dynamicBounds=L.latLngBounds(e.getSouthWest(),e.getNorthEast()))):t.getLatLng&&(e=t.getLatLng(),this._dynamicBounds?this._dynamicBounds.extend(e):this._dynamicBounds=L.latLngBounds(e,e)):t.eachLayer&&t.eachLayer(this._scanForBounds,this)}});

assets/maps/src/Contao.js

@@ -119,8 +119,8 @@ L.Contao = L.Class.extend({
      * @param map         Pass a map object so that the data loading events are passed to the map.
      */
     load: function (hash, type, options, customLayer, map) {
-        var url = this.createRequestUrl(hash);
-        var layer = omnivore[type](url, options, customLayer);
+        var url   = this.createRequestUrl(hash),
+            layer = omnivore[type](url, options, customLayer);
 
         if (map) {
             // Required because Control.Loading tries to get _leafet_id which is created here.

module/config/config.php

@@ -92,6 +92,7 @@ $GLOBALS['LEAFLET_MAPPERS'][] = 'Netzmacht\Contao\Leaflet\Mapper\Layer\MarkersLa
 $GLOBALS['LEAFLET_MAPPERS'][] = 'Netzmacht\Contao\Leaflet\Mapper\Layer\GroupLayerMapper';
 $GLOBALS['LEAFLET_MAPPERS'][] = 'Netzmacht\Contao\Leaflet\Mapper\Layer\VectorsLayerMapper';
 $GLOBALS['LEAFLET_MAPPERS'][] = 'Netzmacht\Contao\Leaflet\Mapper\Layer\ReferenceLayerMapper';
+$GLOBALS['LEAFLET_MAPPERS'][] = 'Netzmacht\Contao\Leaflet\Mapper\Layer\MarkerClusterLayerMapper';
 
 // Control mappers.
 $GLOBALS['LEAFLET_MAPPERS'][] = 'Netzmacht\Contao\Leaflet\Mapper\Control\ZoomControlMapper';
@@ -209,6 +210,11 @@ $GLOBALS['LEAFLET_LAYERS'] = array
 
             return $label;
         }
+    ),
+    'markercluster' => array
+    (
+        'children' => true,
+        'icon'     => 'system/modules/leaflet/assets/img/cluster.png',
     )
 );
 

module/dca/tl_leaflet_layer.php

@@ -144,7 +144,6 @@ $GLOBALS['TL_DCA']['tl_leaflet_layer'] = array
             'active'   => array('active'),
         ),
         'markers extends default' => array(
-            '+title'  => array('markerCluster'),
             '+expert' => array('pointToLayer'),
             '+active' => array('deferred')
         ),
@@ -157,7 +156,24 @@ $GLOBALS['TL_DCA']['tl_leaflet_layer'] = array
         ),
         'reference extends default' => array(
             '+title' => array('reference', 'standalone')
-        )
+        ),
+        'markercluster extends default' => array(
+            'config' => array(
+                'showCoverageOnHover',
+                'zoomToBoundsOnClick',
+                'removeOutsideVisibleBounds',
+                'animateAddingMarkers',
+                'spiderfyOnMaxZoom',
+                'disableClusteringAtZoom',
+                'maxClusterRadius',
+                'singleMarkerMode',
+            ),
+            '+expert' => array(
+                'polygonOptions',
+                'iconCreateFunction',
+                'disableDefaultStyle'
+            ),
+        ),
     ),
 
     'metasubselectpalettes' => array(
@@ -169,6 +185,11 @@ $GLOBALS['TL_DCA']['tl_leaflet_layer'] = array
             'HERE'   => array('tile_provider_key', 'tile_provider_code'),
         ),
     ),
+
+    'metasubpalettes' => array(
+        'spiderfyOnMaxZoom' => array('spiderfyDistanceMultiplier')
+    ),
+
     'fields' => array
     (
         'id'                    => array
@@ -278,22 +299,6 @@ $GLOBALS['TL_DCA']['tl_leaflet_layer'] = array
             'eval'      => array('mandatory' => true, 'maxlength' => 255, 'tl_class' => 'w50'),
             'sql'       => "varchar(255) NOT NULL default ''"
         ),
-        'markerCluster'         => array
-        (
-            'label'            => &$GLOBALS['TL_LANG']['tl_leaflet_layer']['markerCluster'],
-            'exclude'          => true,
-            'inputType'        => 'select',
-            'options_callback' => array('Netzmacht\Contao\Leaflet\Dca\Layer', 'getMarkerClusterLayers'),
-            'reference'        => &$GLOBALS['TL_LANG']['leaflet_layer'],
-            'eval' => array(
-                'mandatory'          => false,
-                'maxlength'          => 255,
-                'tl_class'           => 'w50',
-                'chosen'             => true,
-                'includeBlankOption' => true
-            ),
-            'sql'              => "varchar(255) NOT NULL default ''"
-        ),
         'deferred'  => array
         (
             'label'     => &$GLOBALS['TL_LANG']['tl_leaflet_layer']['deferred'],
@@ -370,5 +375,130 @@ $GLOBALS['TL_DCA']['tl_leaflet_layer'] = array
             ),
             'sql'       => "mediumtext NULL"
         ),
+        'showCoverageOnHover' => array
+        (
+            'label'     => &$GLOBALS['TL_LANG']['tl_leaflet_layer']['showCoverageOnHover'],
+            'exclude'   => true,
+            'inputType' => 'checkbox',
+            'default'   => true,
+            'eval'      => array('tl_class' => 'w50', 'submitOnChange' => false, 'isBoolean' => true),
+            'sql'       => "char(1) NOT NULL default '1'"
+        ),
+        'zoomToBoundsOnClick' => array
+        (
+            'label'     => &$GLOBALS['TL_LANG']['tl_leaflet_layer']['zoomToBoundsOnClick'],
+            'exclude'   => true,
+            'inputType' => 'checkbox',
+            'default'   => true,
+            'eval'      => array('tl_class' => 'w50', 'submitOnChange' => false, 'isBoolean' => true),
+            'sql'       => "char(1) NOT NULL default '1'"
+        ),
+        'spiderfyOnMaxZoom' => array
+        (
+            'label'     => &$GLOBALS['TL_LANG']['tl_leaflet_layer']['spiderfyOnMaxZoom'],
+            'exclude'   => true,
+            'inputType' => 'checkbox',
+            'default'   => true,
+            'eval'      => array('tl_class' => 'w50 m12', 'submitOnChange' => true, 'isBoolean' => true),
+            'sql'       => "char(1) NOT NULL default '1'"
+        ),
+        'removeOutsideVisibleBounds' => array
+        (
+            'label'     => &$GLOBALS['TL_LANG']['tl_leaflet_layer']['removeOutsideVisibleBounds'],
+            'exclude'   => true,
+            'inputType' => 'checkbox',
+            'default'   => true,
+            'eval'      => array('tl_class' => 'w50', 'submitOnChange' => false, 'isBoolean' => true),
+            'sql'       => "char(1) NOT NULL default '1'"
+        ),
+        'animateAddingMarkers' => array
+        (
+            'label'     => &$GLOBALS['TL_LANG']['tl_leaflet_layer']['animateAddingMarkers'],
+            'exclude'   => true,
+            'inputType' => 'checkbox',
+            'default'   => false,
+            'eval'      => array('tl_class' => 'w50', 'submitOnChange' => false, 'isBoolean' => true),
+            'sql'       => "char(1) NOT NULL default ''"
+        ),
+        'disableClusteringAtZoom' => array
+        (
+            'label'            => &$GLOBALS['TL_LANG']['tl_leaflet_layer']['disableClusteringAtZoom'],
+            'exclude'          => true,
+            'inputType'        => 'select',
+            'options_callback' => array('Netzmacht\Contao\Leaflet\Dca\Leaflet', 'getZoomLevels'),
+            'default'          => '',
+            'eval'             => array(
+                'maxlength'          => 4,
+                'rgxp'               => 'digit',
+                'tl_class'           => 'w50',
+                'includeBlankOption' => true,
+                'nullIfEmpty'        => true
+            ),
+            'sql'              => "int(4) NULL"
+        ),
+        'maxClusterRadius' => array
+        (
+            'label'     => &$GLOBALS['TL_LANG']['tl_leaflet_layer']['maxClusterRadius'],
+            'exclude'   => true,
+            'inputType' => 'text',
+            'default'   => null,
+            'eval'      => array('maxlength' => 5, 'rgxp' => 'digit', 'tl_class' => 'w50', 'nullIfEmpty' => true),
+            'sql'       => "int(5) NULL"
+        ),
+        'singleMarkerMode' => array
+        (
+            'label'     => &$GLOBALS['TL_LANG']['tl_leaflet_layer']['singleMarkerMode'],
+            'exclude'   => true,
+            'inputType' => 'checkbox',
+            'default'   => false,
+            'eval'      => array('tl_class' => 'w50 m12', 'submitOnChange' => false, 'isBoolean' => true),
+            'sql'       => "char(1) NOT NULL default ''"
+        ),
+        'polygonOptions'  => array
+        (
+            'label'     => &$GLOBALS['TL_LANG']['tl_leaflet_layer']['polygonOptions'],
+            'exclude'   => true,
+            'inputType' => 'textarea',
+            'eval'      => array(
+                'preserveTags'   => true,
+                'decodeEntities' => true,
+                'allowHtml'      => true,
+                'rte'            => 'ace|json',
+                'tl_class'       => 'clr'
+            ),
+            'sql'       => "mediumtext NULL"
+        ),
+        'spiderfyDistanceMultiplier' => array
+        (
+            'label'     => &$GLOBALS['TL_LANG']['tl_leaflet_layer']['spiderfyDistanceMultiplier'],
+            'exclude'   => true,
+            'inputType' => 'text',
+            'default'   => null,
+            'eval'      => array('maxlength' => 5, 'rgxp' => 'digit', 'tl_class' => 'w50', 'nullIfEmpty' => true),
+            'sql'       => "int(5) NULL"
+        ),
+        'iconCreateFunction'  => array
+        (
+            'label'     => &$GLOBALS['TL_LANG']['tl_leaflet_layer']['iconCreateFunction'],
+            'exclude'   => true,
+            'inputType' => 'textarea',
+            'eval'      => array(
+                'preserveTags'   => true,
+                'decodeEntities' => true,
+                'allowHtml'      => true,
+                'rte'            => 'ace|javascript',
+                'tl_class'       => 'clr'
+            ),
+            'sql'       => "mediumtext NULL"
+        ),
+        'disableDefaultStyle' => array
+        (
+            'label'     => &$GLOBALS['TL_LANG']['tl_leaflet_layer']['disableDefaultStyle'],
+            'exclude'   => true,
+            'inputType' => 'checkbox',
+            'default'   => false,
+            'eval'      => array('tl_class' => 'w50', 'submitOnChange' => false, 'isBoolean' => true),
+            'sql'       => "char(1) NOT NULL default ''"
+        ),
     )
 );

module/languages/en/tl_leaflet_layer.php

@@ -52,6 +52,30 @@ $GLOBALS['TL_LANG']['tl_leaflet_layer']['onEachFeature'][0]         = 'onEachFea
 $GLOBALS['TL_LANG']['tl_leaflet_layer']['onEachFeature'][1]              = 'Use a custom onEachFeature expression. Can be a anonymous function or method reference. If defined the extension does not handle popup adding for you.';
 $GLOBALS['TL_LANG']['tl_leaflet_layer']['pointToLayer'][0]               = 'pointToLayer expression';
 $GLOBALS['TL_LANG']['tl_leaflet_layer']['pointToLayer'][1]               = 'Use a custom pointToLayer expression. Can be a anonymous function or method reference. If defined the extension does not handle popup or icon adding for you.';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['showCoverageOnHover'][0]        = 'Show coverage on hover';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['showCoverageOnHover'][1]        = 'When you mouse over a cluster it shows the bounds of its markers.';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['zoomToBoundsOnClick'][0]        = 'Zoom to bounds on click';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['zoomToBoundsOnClick'][1]        = 'When you click a cluster we zoom to its bounds.';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['spiderfyOnMaxZoom'][0]          = 'Spiderfy on max zoom';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['spiderfyOnMaxZoom'][1]          = 'When you click a cluster at the bottom zoom level we spiderfy it so you can see all of its markers.';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['removeOutsideVisibleBounds'][0] = 'Remove when outside of visible bounds';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['removeOutsideVisibleBounds'][1] = 'Clusters and markers too far from the viewport are removed from the map for performance.';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['animateAddingMarkers'][0]       = 'Animate adding markers';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['animateAddingMarkers'][1]       = 'If set to true then adding individual markers to the MarkerClusterGroup after it has been added to the map will add the marker and animate it in to the cluster.';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['disableClusteringAtZoom'][0]    = 'Disable clustering at zoom level';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['disableClusteringAtZoom'][1]    = 'If set, at this zoom level and below markers will not be clustered. This defaults to disabled. ';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['maxClusterRadius'][0]           = 'Max cluster radius';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['maxClusterRadius'][1]           = 'The maximum radius that a cluster will cover from the central marker (in pixels).';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['polygonOptions'][0]             = 'Polygon options';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['polygonOptions'][1]             = 'Options to pass when creating the L.Polygon(points, options) to show the bounds of a cluster.';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['singleMarkerMode'][0]           = 'Show cluster instead of marker';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['singleMarkerMode'][1]           = 'If set to true, overrides the icon for all added markers to make them appear as a 1 size cluster.';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['spiderfyDistanceMultiplier'][0] = 'Spiderfy distance multiplier';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['spiderfyDistanceMultiplier'][1] = 'Increase from 1 to increase the distance away from the center that spiderfied markers are placed. Use if you are using big marker icons.';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['iconCreateFunction'][0]         = 'Create cluster icon function';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['iconCreateFunction'][1]         = 'Function used to create the cluster icon.';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['disableDefaultStyle'][0]        = 'Disable default style';
+$GLOBALS['TL_LANG']['tl_leaflet_layer']['disableDefaultStyle'][1]        = 'Do not load default marker cluster stylesheets.';
 
 $GLOBALS['TL_LANG']['tl_leaflet_layer']['groupTypes']['layer'][0]   = 'Layer group';
 $GLOBALS['TL_LANG']['tl_leaflet_layer']['groupTypes']['layer'][1]   = 'Basic layer group. <br> See <a href="http://leafletjs.com/reference.html#layergroup" target="_blank">http://leafletjs.com/reference.html#layergroup</a>';

src/Netzmacht/Contao/Leaflet/Mapper/Layer/MarkerClusterLayerMapper.php

@@ -0,0 +1,113 @@
+<?php
+
+/**
+ * @package    dev
+ * @author     David Molineus <david.molineus@netzmacht.de>
+ * @copyright  2015 netzmacht creative David Molineus
+ * @license    LGPL 3.0
+ * @filesource
+ *
+ */
+
+namespace Netzmacht\Contao\Leaflet\Mapper\Layer;
+
+use Netzmacht\Contao\Leaflet\Mapper\DefinitionMapper;
+use Netzmacht\Contao\Leaflet\Model\LayerModel;
+use Netzmacht\JavascriptBuilder\Type\AnonymousFunction;
+use Netzmacht\JavascriptBuilder\Type\Expression;
+use Netzmacht\LeafletPHP\Definition;
+use Netzmacht\LeafletPHP\Definition\HasEvents;
+use Netzmacht\LeafletPHP\Definition\Layer;
+use Netzmacht\LeafletPHP\Definition\Type\LatLngBounds;
+use Netzmacht\LeafletPHP\Plugins\MarkerCluster\MarkerClusterGroup;
+use Netzmacht\LeafletPHP\Plugins\Omnivore\OmnivoreLayer;
+
+/**
+ * Class MarkerClusterLayerMapper maps the layer database model to the marker cluster definition.
+ *
+ * @package Netzmacht\Contao\Leaflet\Mapper\Layer
+ */
+class MarkerClusterLayerMapper extends AbstractLayerMapper
+{
+    /**
+     * Class of the definition being created.
+     *
+     * @var string
+     */
+    protected static $definitionClass = 'Netzmacht\LeafletPHP\Plugins\MarkerCluster\MarkerClusterGroup';
+
+    /**
+     * Layer type.
+     *
+     * @var string
+     */
+    protected static $type = 'markercluster';
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function initialize()
+    {
+        parent::initialize();
+
+        $this
+            ->addOptions('showCoverageOnHover', 'zoomToBoundsOnClick', 'spiderfyOnMaxZoom')
+            ->addOption('removeOutsideVisibleBounds')
+            ->addConditionalOption('maxClusterRadius')
+            ->addConditionalOption('singleMarkerMode')
+            ->addConditionalOption('animateAddingMarkers')
+            ->addConditionalOption('disableClusteringAtZoom')
+            ->addConditionalOption('spiderfyDistanceMultiplier');
+    }
+
+    /**
+     * {@inheritdoc}
+     * @SuppressWarnings(PHPMD.Superglobals)
+     */
+    protected function build(
+        Definition $definition,
+        \Model $model,
+        DefinitionMapper $mapper,
+        LatLngBounds $bounds = null,
+        Definition $parent = null
+    ) {
+        parent::build($definition, $model, $mapper, $bounds, $parent);
+
+        /** @var MarkerClusterGroup $definition */
+
+        if ($model->iconCreateFunction) {
+            $definition->setIconCreateFunction(new Expression($model->iconCreateFunction));
+        }
+
+        if ($model->polygonOptions) {
+            $definition->setPolygonOptions((array) json_decode($model->polygonOptions, true));
+        }
+
+        if (!$model->disableDefaultStyle) {
+            $GLOBALS['TL_CSS'][] = 'assets/leaflet/libs/leaflet-markercluster/MarkerCluster.Default.css||static';
+        }
+
+        $collection = LayerModel::findBy(
+            array('pid=?', 'active=1'),
+            array($model->id),
+            array('order' => 'sorting')
+        );
+
+        if ($collection) {
+            foreach ($collection as $layerModel) {
+                $layer = $mapper->handle($layerModel);
+
+                if ($layer instanceof Layer) {
+                    $definition->addLayer($layer);
+
+                    if ($layer instanceof OmnivoreLayer) {
+                        $callback = new AnonymousFunction();
+                        $callback->addLine('layers.' . $definition->getId() . '.addLayers(this.getLayers())');
+
+                        $layer->on('ready', $callback);
+                    }
+                }
+            }
+        }
+    }
+}