Add renderOrder option to ol.layer.Vector

src/ol/layer/vectorlayer.js

@@ -6,8 +6,17 @@ goog.require('ol.feature');
 goog.require('ol.layer.Layer');
 
 
+/**
+ * @enum {string}
+ */
+ol.layer.VectorProperty = {
+  RENDER_ORDER: 'renderOrder'
+};
+
+
 
 /**
+ *
  * @constructor
  * @extends {ol.layer.Layer}
  * @fires {@link ol.render.Event} ol.render.Event
@@ -46,6 +55,16 @@ ol.layer.Vector = function(opt_options) {
 goog.inherits(ol.layer.Vector, ol.layer.Layer);
 
 
+/**
+ * @return {function(ol.Feature, ol.Feature): number|null|undefined} Render
+ *     order.
+ */
+ol.layer.Vector.prototype.getRenderOrder = function() {
+  return /** @type {function(ol.Feature, ol.Feature):number|null|undefined} */ (
+      this.get(ol.layer.VectorProperty.RENDER_ORDER));
+};
+
+
 /**
  * Get the style for features.  This returns whatever was passed to the `style`
  * option at construction or to the `setStyle` method.
@@ -67,6 +86,15 @@ ol.layer.Vector.prototype.getStyleFunction = function() {
 };
 
 
+/**
+ * @param {function(ol.Feature, ol.Feature):number|null|undefined} renderOrder
+ *     Render order.
+ */
+ol.layer.Vector.prototype.setRenderOrder = function(renderOrder) {
+  this.set(ol.layer.VectorProperty.RENDER_ORDER, renderOrder);
+};
+
+
 /**
  * Set the style for features.  This can be a single style object, an array
  * of styles, or a function that takes a feature and resolution and returns