From c2355d207cf587628e10d99b80532d7f51454839 Mon Sep 17 00:00:00 2001
From: euzuro <euzuro@metacarta.com>
Date: Wed, 16 Aug 2006 17:24:55 +0000
Subject: [PATCH] make sure scroll only scrolls if it was done over the map,
 and also stop event propagation so that the window doesnt scroll too

git-svn-id: http://svn.openlayers.org/trunk/openlayers@1246 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
---
 lib/OpenLayers/Control/MouseDefaults.js | 48 +++++++++++++++++--------
 1 file changed, 33 insertions(+), 15 deletions(-)

diff --git a/lib/OpenLayers/Control/MouseDefaults.js b/lib/OpenLayers/Control/MouseDefaults.js
index 9a7b8900d8..d51d566e5a 100644
--- a/lib/OpenLayers/Control/MouseDefaults.js
+++ b/lib/OpenLayers/Control/MouseDefaults.js
@@ -183,24 +183,42 @@ OpenLayers.Control.MouseDefaults.prototype =
      * @param {Event} e
      */
     onWheelEvent: function(e){
-        var delta = 0;
-        if (!e) {
-            e = window.event;
-        }
-        if (e.wheelDelta) {
-            delta = e.wheelDelta/120; 
-            if (window.opera) {
-                delta = -delta;
+    
+        // first determine whether or not the wheeling was inside the map
+        var inMap = false;
+        var elem = Event.element(e);
+        while(elem != null) {
+            if (elem == this.map.div) {
+                inMap = true;
+                break;
             }
-        } else if (e.detail) {
-            delta = -e.detail / 3;
+            elem = elem.parentNode;
         }
-        if (delta) {
-            if (delta < 0) {
-               this.defaultWheelDown();
-            } else {
-               this.defaultWheelUp();
+        
+        if (inMap) {
+            
+            var delta = 0;
+            if (!e) {
+                e = window.event;
             }
+            if (e.wheelDelta) {
+                delta = e.wheelDelta/120; 
+                if (window.opera) {
+                    delta = -delta;
+                }
+            } else if (e.detail) {
+                delta = -e.detail / 3;
+            }
+            if (delta) {
+                if (delta < 0) {
+                   this.defaultWheelDown();
+                } else {
+                   this.defaultWheelUp();
+                }
+            }
+            
+            //only wheel the map, not the window
+            Event.stop(e);
         }
     },