openlayers madness

public/lib/OpenLayers/Control/KeyboardDefaults.js

@@ -0,0 +1,65 @@
+/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
+ * See http://svn.openlayers.org/trunk/openlayers/license.txt for the full
+ * text of the license. */
+// @require: OpenLayers/Control.js
+
+/**
+ * @class
+ */
+OpenLayers.Control.KeyboardDefaults = Class.create();
+OpenLayers.Control.KeyboardDefaults.prototype = 
+  Object.extend( new OpenLayers.Control(), {
+
+    /** @type int */
+    slideFactor: 50,
+
+    /**
+     * @constructor
+     */
+    initialize: function() {
+        OpenLayers.Control.prototype.initialize.apply(this, arguments);
+    },
+    
+    /**
+     * 
+     */
+    draw: function() {
+        Event.observe(document, 
+                      'keypress', 
+                      this.defaultKeyDown.bind(this));
+    },
+    
+    /**
+    * @param {Event} evt
+    */
+    defaultKeyDown: function (evt) {
+
+        var slide = this.map.getResolution() * this.slideFactor;
+        var center = this.map.getCenter();
+    
+        var newCenter = center.copyOf();
+
+        switch(evt.keyCode) {
+            case Event.KEY_LEFT:
+                newCenter = newCenter.add( -slide, 0);
+                break;
+            case Event.KEY_RIGHT: 
+                newCenter = newCenter.add( slide, 0);
+                break;
+            case Event.KEY_UP:
+                newCenter = newCenter.add( 0, slide);
+                break;
+            case Event.KEY_DOWN:
+                newCenter = newCenter.add( 0, -slide);
+                break;
+        }
+        
+        if (!newCenter.equals(center)) {
+            this.map.setCenter(newCenter);
+            Event.stop(evt);
+        }
+    },
+    
+    /** @final @type String */
+    CLASS_NAME: "OpenLayers.Control.KeyboardDefaults"
+});