Initial port of Control.js and Navigation.js.

This also adds an Events instance to the map, so the Navigation control can register events on the map.

Tests still missing.

src/ol/control/Navigation.js

@@ -0,0 +1,49 @@
+goog.provide('ol.control.Navigation');
+
+goog.require('ol.control.Control');
+
+
+/**
+ * @constructor
+ * @extends ol.control.Control
+ * @param {boolean|undefined} opt_autoActivate
+ */
+ol.control.Navigation = function(opt_autoActivate) {
+
+    goog.base(this, opt_autoActivate);
+
+    /**
+     * Activate this control when it is added to a map.  Default is true.
+     *
+     * @type {boolean} autoActivate
+     */
+    this.autoActivate_ =
+        goog.isDef(opt_autoActivate) ? opt_autoActivate : true;
+
+};
+goog.inherits(ol.control.Navigation, ol.control.Control);
+
+/** @inheritDoc */
+ol.control.Navigation.prototype.activate = function() {
+    var active = goog.base(this, 'activate');
+    if (active) {
+        this.getMap().getEvents().register("drag", this.moveMap, this);
+    }
+    return active;
+};
+
+/** @inheritDoc */
+ol.control.Navigation.prototype.deactivate = function() {
+    var inactive = goog.base(this, 'deactivate');
+    if (inactive) {
+        this.getMap().getEvents().unregister("drag", this.moveMap, this);
+    }
+    return inactive;
+};
+
+/**
+ * @param {Event} evt
+ */
+ol.control.Navigation.prototype.moveMap = function(evt) {
+    this.getMap().moveByPx(evt.dx, evt.xy);
+};