Created a TransformFeature control and added a documentDrag option to the DragFeature control. r=elemoine (closes #2433)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@9999 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/DragFeature.js

@@ -64,6 +64,13 @@ OpenLayers.Control.DragFeature = OpenLayers.Class(OpenLayers.Control, {
      */
     onComplete: function(feature, pixel) {},
 
+    /**
+     * APIProperty: documentDrag
+     * {Boolean} If set to true, mouse dragging will continue even if the
+     *     mouse cursor leaves the map viewport. Default is false.
+     */
+    documentDrag: false,
+    
     /**
      * Property: layer
      * {<OpenLayers.Layer.Vector>}
@@ -115,7 +122,9 @@ OpenLayers.Control.DragFeature = OpenLayers.Class(OpenLayers.Control, {
                     up: this.upFeature,
                     out: this.cancel,
                     done: this.doneDragging
-                }, this.dragCallbacks)
+                }, this.dragCallbacks), {
+                    documentDrag: this.documentDrag
+                }
             ),
             feature: new OpenLayers.Handler.Feature(
                 this, this.layer, OpenLayers.Util.extend({