Fixing up WheelEvent to follow W3C standards and work on all platforms.

samples/ui_lib/touch/Scroller.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Implementation of a custom scrolling behavior.
  * This behavior overrides native scrolling for an area. This area can be a
  * single defined part of a page, the entire page, or several different parts
  * of a page.
  *
@@ skipping 143 matching lines @@
     _touchHandler = new TouchHandler(this, scrollableElem.parent);
     _momentum = new Momentum(this, defaultDecelerationFactor);
 
     Element parentElem = scrollableElem.parent;
     assert(parentElem != null);
     _setOffsetFunction = _getOffsetFunction(_scrollTechnique);
     _touchHandler.setDraggable(this);
     _touchHandler.enable(capture);
 
     _frame.on.mouseWheel.add((e) {
-      if (e.wheelDeltaY != 0 && verticalEnabled ||
-          e.wheelDeltaX != 0 && horizontalEnabled) {
-        num x = horizontalEnabled ? e.wheelDeltaX : 0;
-        num y = verticalEnabled ? e.wheelDeltaY : 0;
+      if (e.deltaY != 0 && verticalEnabled ||
+          e.deltaX != 0 && horizontalEnabled) {
+        num x = horizontalEnabled ? e.deltaX : 0;
+        num y = verticalEnabled ? e.deltaY : 0;
         throwDelta(x, y, FAST_SNAP_DECELERATION_FACTOR);
         e.preventDefault();
       }
     });
 
     _frame.on.keyDown.add((KeyboardEvent e) {
         bool handled = false;
         // We ignore key events where further scrolling in that direction
         // would have no impact which matches default browser behavior with
         // nested scrollable areas.
@@ skipping 544 matching lines @@
     for (EventListener listener in _listeners) {
       listener(evt);
     }
   }
 }
 
 class ScrollerScrollTechnique {
   static const TRANSFORM_3D = 1;
   static const RELATIVE_POSITIONING = 2;
 }