Adding eventListeners property to layer, control, and map. Setting this property at construction registers the given listeners based on event type key. r=elemoine (closes #1404)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@6435 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control.js

@@ -104,6 +104,15 @@ OpenLayers.Control = OpenLayers.Class({
      */
     handler: null,
 
+    /**
+     * APIProperty: eventListeners
+     * {Object} If set as an option at construction, the eventListeners
+     *     object will be registered with <OpenLayers.Events.on>.  Object
+     *     structure must be a listeners object as shown in the example for
+     *     the events.on method.
+     */
+    eventListeners: null,
+
     /** 
      * Property: events
      * {<OpenLayers.Events>} Events instance for triggering control specific
@@ -155,6 +164,9 @@ OpenLayers.Control = OpenLayers.Class({
         OpenLayers.Util.extend(this, options);
         
         this.events = new OpenLayers.Events(this, null, this.EVENT_TYPES);
+        if(this.eventListeners instanceof Object) {
+            this.events.on(this.eventListeners);
+        }
         this.id = OpenLayers.Util.createUniqueID(this.CLASS_NAME + "_");
     },
 
@@ -230,7 +242,7 @@ OpenLayers.Control = OpenLayers.Class({
         if (px != null) {
             this.position = px.clone();
         }
-        this.moveTo(this.position);        
+        this.moveTo(this.position);
         return this.div;
     },