With Erik's approval on #341, I'm happy with this. This restores the

mousewheel functionality we had in earlier releases in a similar way, rewritten
for handlers. (The benefit of handlers in this case is that handlers are 
write-once, use many, so the next mousewheel thing we get will *also* be able 
to use this code.)


git-svn-id: http://svn.openlayers.org/trunk/openlayers@2877 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Handler/MouseWheel.js

@@ -13,6 +13,14 @@ OpenLayers.Handler.MouseWheel.prototype = OpenLayers.Class.inherit( OpenLayers.H
     /** @type function **/
     wheelListener: null,
 
+    /** @type OpenLayers.Pixel
+     *  @private
+     * 
+     *  mousePosition is necessary because evt.clientX/Y is buggy in Moz on
+     *  wheel events, so we cache and use the value from the last mousemove.
+     **/
+    mousePosition: null,
+
     /**
      * @constructor
      *
@@ -68,8 +76,7 @@ OpenLayers.Handler.MouseWheel.prototype = OpenLayers.Class.inherit( OpenLayers.H
                 // add the mouse position to the event because mozilla has a bug
                 // with clientX and clientY (see https://bugzilla.mozilla.org/show_bug.cgi?id=352179)
                 // getLonLatFromViewPortPx(e) returns wrong values
-                // TODO FIXME FIXME this might not be the right way to port the 2.3 behavior
-                e.xy = this.map.events.getMousePosition(e);
+                e.xy = this.mousePosition;
                 if (delta < 0) {
                    this.callback("down", [e, delta]);
                 } else {
@@ -82,6 +89,10 @@ OpenLayers.Handler.MouseWheel.prototype = OpenLayers.Class.inherit( OpenLayers.H
         }
     },
 
+    mousemove: function (evt) {
+        this.mousePosition = evt.xy;
+    },
+
     activate: function (evt) {
         OpenLayers.Handler.prototype.activate.apply(this, arguments);
         //register mousewheel events specifically on the window and document