Add 'getLayer()' method to 'ol.interaction.Select'

src/ol/interaction/selectinteraction.js

@@ -8,6 +8,7 @@ goog.require('goog.asserts');
 goog.require('goog.events');
 goog.require('goog.events.Event');
 goog.require('goog.functions');
+goog.require('goog.object');
 goog.require('ol.CollectionEventType');
 goog.require('ol.Feature');
 goog.require('ol.array');
@@ -174,6 +175,14 @@ ol.interaction.Select = function(opt_options) {
    */
   this.layerFilter_ = layerFilter;
 
+  /**
+   * An association between selected feature (key)
+   * and layer (value)
+   * @private
+   * @type {Array.<ol.layer.Vector>}
+   */
+  this.featureLayerAssociation_ = [];
+
   /**
    * @private
    * @type {ol.layer.Vector}
@@ -200,6 +209,20 @@ ol.interaction.Select = function(opt_options) {
 goog.inherits(ol.interaction.Select, ol.interaction.Interaction);
 
 
+/**
+ * @param {ol.Feature} feature Feature.
+ * @param {ol.layer.Layer} layer Layer.
+ * @private
+ */
+ol.interaction.Select.prototype.addFeatureLayerAssociation_ =
+    function(feature, layer) {
+  var key = goog.getUid(feature);
+  var obj = {};
+  obj[key] = layer;
+  this.featureLayerAssociation_.push(obj);
+};
+
+
 /**
  * Get the selected features.
  * @return {ol.Collection.<ol.Feature>} Features collection.
@@ -210,6 +233,27 @@ ol.interaction.Select.prototype.getFeatures = function() {
 };
 
 
+/**
+ * Returns the associated {@link ol.layer.Vector vectorlayer} of
+ * the (last) selected feature.
+ * @param {ol.Feature} feature Feature
+ * @return {ol.layer.Vector} Layer.
+ * @api
+ */
+ol.interaction.Select.prototype.getLayer = function(feature) {
+  goog.asserts.assertInstanceof(feature, ol.Feature,
+      'feature should be an ol.Feature');
+  var key = goog.getUid(feature).toString();
+  var found = goog.array.find(this.featureLayerAssociation_, function(each) {
+    if (key == goog.object.getKeys(each)[0]) {
+      return true;
+    }
+    return false;
+  });
+  return /** @type {ol.layer.Vector} */ (goog.object.getValues(found)[0]);
+};
+
+
 /**
  * Handles the {@link ol.MapBrowserEvent map browser event} and may change the
  * selected state of features.
@@ -243,6 +287,7 @@ ol.interaction.Select.handleEvent = function(mapBrowserEvent) {
         function(feature, layer) {
           if (this.filter_(feature, layer)) {
             selected.push(feature);
+            this.addFeatureLayerAssociation_(feature, layer);
             return !this.multi_;
           }
         }, this, this.layerFilter_);
@@ -256,6 +301,16 @@ ol.interaction.Select.handleEvent = function(mapBrowserEvent) {
         features.clear();
       }
       features.extend(selected);
+      // Modify array featureLayerAssociation_
+      if (selected.length === 0) {
+        this.featureLayerAssociation_.length = 0;
+      } else {
+        if (deselected.length > 0) {
+          deselected.forEach(function(feature) {
+            this.removeFeatureLayerAssociation_(feature);
+          }, this);
+        }
+      }
     }
   } else {
     // Modify the currently selected feature(s).
@@ -269,11 +324,13 @@ ol.interaction.Select.handleEvent = function(mapBrowserEvent) {
             if (add || toggle) {
               if (this.filter_(feature, layer)) {
                 selected.push(feature);
+                this.addFeatureLayerAssociation_(feature, layer);
               }
             }
           } else {
             if (remove || toggle) {
               deselected.push(feature);
+              this.removeFeatureLayerAssociation_(feature);
             }
           }
         }, this, this.layerFilter_);
@@ -360,3 +417,21 @@ ol.interaction.Select.prototype.removeFeature_ = function(evt) {
     map.unskipFeature(feature);
   }
 };
+
+
+/**
+ * @param {ol.Feature} feature Feature.
+ * @private
+ */
+ol.interaction.Select.prototype.removeFeatureLayerAssociation_ =
+    function(feature) {
+  var key = goog.getUid(feature);
+  var index = goog.array.findIndex(this.featureLayerAssociation_,
+      function(each) {
+        if (key == goog.object.getKeys(each)[0]) {
+          return true;
+        }
+        return false;
+      });
+  this.featureLayerAssociation_.splice(index, 1);
+};