Make mouse wheel events work in CPWebView in Firefox 3+

AppKit/CPWebView.j

@@ -171,7 +171,32 @@ CPWebViewScrollNative                           = 2;
     [self _resizeWebFrame];
 }
 
-- (BOOL)_resizeWebFrame
+- (void)_attachScrollEventIfNecessary
+{
+    if (_scrollMode !== CPWebViewScrollAppKit)
+        return;
+
+    var win = null;
+    try { win = [self DOMWindow]; } catch (e) {}
+
+    if (win && win.addEventListener)
+    {
+        var scrollEventHandler = function(anEvent)
+        {
+            var frameBounds = [self bounds],
+                frameCenter = CGPointMake(CGRectGetMidX(frameBounds), CGRectGetMidY(frameBounds)),
+                windowOrigin = [self convertPoint:frameCenter toView:nil],
+                globalOrigin = [[self window] convertBaseToBridge:windowOrigin];
+
+            anEvent._overrideLocation = globalOrigin;
+            [[[self window] platformWindow] scrollEvent:anEvent];
+        };
+
+        win.addEventListener("DOMMouseScroll", scrollEventHandler, false);
+    }
+}
+
+- (void)_resizeWebFrame
 {
     if (_scrollMode === CPWebViewScrollAppKit)
     {
@@ -320,7 +345,8 @@ CPWebViewScrollNative                           = 2;
 - (void)_finishedLoading
 {
     [self _resizeWebFrame];
-    
+    [self _attachScrollEventIfNecessary];
+
     [[CPNotificationCenter defaultCenter] postNotificationName:CPWebViewProgressFinishedNotification object:self];
 
     if ([_frameLoadDelegate respondsToSelector:@selector(webView:didFinishLoadForFrame:)])

AppKit/Platform/DOM/CPPlatformWindow+DOM.j

@@ -851,12 +851,13 @@ var supportsNativeDragAndDrop = [CPPlatform supportsDragAndDrop];
     if(!aDOMEvent)
         aDOMEvent = window.event;
 
+    var location = nil;
     if (CPFeatureIsCompatible(CPJavaScriptMouseWheelValues_8_15))
     {
-        var x = 0.0,
-            y = 0.0,
+        var x = aDOMEvent._offsetX || 0.0,
+            y = aDOMEvent._offsetY || 0.0,
             element = aDOMEvent.target;
-        
+
         while (element.nodeType !== 1)
             element = element.parentNode;
 
@@ -870,11 +871,13 @@ var supportsNativeDragAndDrop = [CPPlatform supportsDragAndDrop];
             } while (element = element.offsetParent);
         }
     
-        var location = _CGPointMake((x + ((aDOMEvent.clientX - 8) / 15)), (y + ((aDOMEvent.clientY - 8) / 15)));
+        location = _CGPointMake((x + ((aDOMEvent.clientX - 8) / 15)), (y + ((aDOMEvent.clientY - 8) / 15)));
     }
+    else if (aDOMEvent._overrideLocation)
+        location = aDOMEvent._overrideLocation;
     else
-        var location = _CGPointMake(aDOMEvent.clientX, aDOMEvent.clientY);
-        
+        location = _CGPointMake(aDOMEvent.clientX, aDOMEvent.clientY);
+
     var deltaX = 0.0,
         deltaY = 0.0,
         windowNumber = 0,
@@ -883,7 +886,7 @@ var supportsNativeDragAndDrop = [CPPlatform supportsDragAndDrop];
                         (aDOMEvent.ctrlKey ? CPControlKeyMask : 0) | 
                         (aDOMEvent.altKey ? CPAlternateKeyMask : 0) | 
                         (aDOMEvent.metaKey ? CPCommandKeyMask : 0);
-          
+
     StopDOMEventPropagation = YES;
 
     var theWindow = [self hitTest:location];