Add addInteraction and removeInteraction methods to the map

This is in line with how we add/remove controls and overlays.

src/ol/map.js

@@ -350,6 +350,14 @@ ol.Map = function(options) {
         control.setMap(this);
       }, this);
 
+  this.interactions_.forEach(
+      /**
+       * @param {ol.interaction.Interaction} interaction Interaction.
+       */
+      function(interaction) {
+        interaction.setMap(this);
+      }, this);
+
   this.overlays_.forEach(
       /**
        * @param {ol.Overlay} overlay Overlay.
@@ -375,6 +383,18 @@ ol.Map.prototype.addControl = function(control) {
 };
 
 
+/**
+ * Add the given interaction to the map.
+ * @param {ol.interaction.Interaction} interaction Interaction to add.
+ */
+ol.Map.prototype.addInteraction = function(interaction) {
+  var interactions = this.getInteractions();
+  goog.asserts.assert(goog.isDef(interactions));
+  interactions.push(interaction);
+  interaction.setMap(this);
+};
+
+
 /**
  * Adds the given layer to the top of this map.
  * @param {ol.layer.Base} layer Layer.
@@ -953,6 +973,24 @@ ol.Map.prototype.removeControl = function(control) {
 };
 
 
+/**
+ * Remove the given interaction from the map.
+ * @param {ol.interaction.Interaction} interaction Interaction to remove.
+ * @return {ol.interaction.Interaction|undefined} The removed interaction (or
+ *     undefined if the interaction was not found).
+ */
+ol.Map.prototype.removeInteraction = function(interaction) {
+  var removed;
+  var interactions = this.getInteractions();
+  goog.asserts.assert(goog.isDef(interactions));
+  if (goog.isDef(interactions.remove(interaction))) {
+    interaction.setMap(null);
+    removed = interaction;
+  }
+  return removed;
+};
+
+
 /**
  * Removes the given layer from the map.
  * @param {ol.layer.Base} layer Layer.

test/spec/ol/map.test.js

@@ -51,6 +51,52 @@ describe('ol.RendererHints', function() {
 
 describe('ol.Map', function() {
 
+  describe('contstructor', function() {
+    it('creates a new map', function() {
+      var map = new ol.Map({});
+      expect(map).to.be.a(ol.Map);
+    });
+
+    it('creates a set of default interactions', function() {
+      var map = new ol.Map({});
+      var interactions = map.getInteractions();
+      var length = interactions.getLength();
+      expect(length).to.be.greaterThan(0);
+
+      for (var i = 0; i < length; ++i) {
+        expect(interactions.getAt(i).getMap()).to.be(map);
+      }
+    });
+  });
+
+  describe('#addInteraction()', function() {
+    it('adds an interaction to the map', function() {
+      var map = new ol.Map({});
+      var interaction = new ol.interaction.Interaction();
+
+      var before = map.getInteractions().getLength();
+      map.addInteraction(interaction);
+      var after = map.getInteractions().getLength();
+      expect(after).to.be(before + 1);
+      expect(interaction.getMap()).to.be(map);
+    });
+  });
+
+  describe('#removeInteraction()', function() {
+    it('removes an interaction from the map', function() {
+      var map = new ol.Map({});
+      var interaction = new ol.interaction.Interaction();
+
+      var before = map.getInteractions().getLength();
+      map.addInteraction(interaction);
+
+      map.removeInteraction(interaction);
+      expect(map.getInteractions().getLength()).to.be(before);
+
+      expect(interaction.getMap()).to.be(null);
+    });
+  });
+
   describe('dispose', function() {
     var map;
 
@@ -128,5 +174,6 @@ goog.require('ol.Map');
 goog.require('ol.RendererHint');
 goog.require('ol.RendererHints');
 goog.require('ol.interaction');
+goog.require('ol.interaction.Interaction');
 goog.require('ol.interaction.DoubleClickZoom');
 goog.require('ol.interaction.MouseWheelZoom');