Keyboard-related classes get destroy(). Fixes #598. Ba-ding.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@2936 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/KeyboardDefaults.js

@@ -23,6 +23,18 @@ OpenLayers.Control.KeyboardDefaults.prototype =
         OpenLayers.Control.prototype.initialize.apply(this, arguments);
     },
     
+    /**
+     * 
+     */
+    destroy: function() {
+        if (this.handler) {
+            this.handler.destroy();
+        }        
+        this.handler = null;
+        
+        OpenLayers.Control.prototype.destroy.apply(this, arguments);
+    },
+    
     /**
      * 
      */

lib/OpenLayers/Handler/Keyboard.js

@@ -32,6 +32,15 @@ OpenLayers.Handler.Keyboard.prototype = OpenLayers.Class.inherit( OpenLayers.Han
         this.eventListener = this.handleKeyEvent.bindAsEventListener(this);
     },
     
+    /**
+     * 
+     */
+    destroy: function() {
+        this.deactivate();
+        this.eventListener = null;
+        OpenLayers.Control.prototype.destroy.apply(this, arguments);
+    },
+
     activate: function() {
         OpenLayers.Handler.prototype.activate.apply(this, arguments);
         for (var i = 0; i < this.KEY_EVENTS.length; i++) {