YUI ScrollView w/ Mousewheel support

gistfile1.diff

diff --git a/src/scrollview/js/scrollview-base.js b/src/scrollview/js/scrollview-base.js
index 394a75d..e967c97 100644
--- a/src/scrollview/js/scrollview-base.js
+++ b/src/scrollview/js/scrollview-base.js
@@ -15,6 +15,7 @@ var getClassName = Y.ClassNameManager.getClassName,
 
     FLICK = EV_SCROLL_FLICK,
     DRAG = "drag",
+    MOUSEWHEEL = "mousewheel",
 
     UI = 'ui',
     
@@ -120,6 +121,7 @@ Y.ScrollView = Y.extend(ScrollView, Y.Widget, {
 
         sv._bindDrag(sv.get(DRAG));
         sv._bindFlick(sv.get(FLICK));
+        sv._bindMousewheel(sv.get(MOUSEWHEEL));
         sv._bindAttrs();
 
         // IE SELECT HACK. See if we can do this non-natively and in the gesture for a future release.
@@ -193,6 +195,15 @@ Y.ScrollView = Y.extend(ScrollView, Y.Widget, {
             cb.detach('flick|*');
         }
     },
+    
+    _bindMousewheel : function(mousewheel) {
+        var cb = this._cb;
+        if (mousewheel) {
+            cb.on("mousewheel", Y.bind(this._mousewheel, this), mousewheel);
+        } else {
+            cb.detach('mousewheel|*');
+        }
+    },
 
     /**
      * syncUI implementation.
@@ -217,7 +228,16 @@ Y.ScrollView = Y.extend(ScrollView, Y.Widget, {
      * @param easing {String} An easing equation if duration is set
      */
     scrollTo: function(x, y, duration, easing) {
-
+        
+        if (easing === undefined) {
+            if ( y < this._minScrollY) {
+                y = this._minScrollY;
+            }
+            else if ( y > this._maxScrollY) {
+                y = this._maxScrollY;
+            }
+        }
+        
         if (!this._cDisabled) {
             var cb = this._cb,
                 xSet = (x !== null),
@@ -815,6 +835,28 @@ Y.ScrollView = Y.extend(ScrollView, Y.Widget, {
         }
     },
 
+    _mousewheel: function(e) {
+        var scrollY = this.get('scrollY'),
+            contentBox = this._cb,
+            lineHeight = contentBox.one("ul li").getComputedStyle('height'),
+            lineHeightInt = parseInt(lineHeight, 10),
+            scrollToY = scrollY - (e.wheelDelta * lineHeightInt);
+
+        this.scrollTo(0, scrollToY);
+        
+        // if we have scrollbars plugin, update & set the flash timer on the scrollbar
+        if (this.scrollbars) {
+            this.scrollbars._hostDimensionsChange();
+            // or
+            //this.scrollbars._update();
+            // & 
+            //this.scrollbars.flash();
+        }
+
+        // prevent browser default behavior on mouse scroll
+        e.preventDefault();
+    },
+
     /**
      * Execute a single frame in the flick animation
      *
@@ -1077,6 +1119,18 @@ Y.ScrollView = Y.extend(ScrollView, Y.Widget, {
          */
         drag: {
             value: true
+        },
+
+        /**
+         * Enable/Disable mousewheel support
+         * @attribute mousewheel
+         * @type boolean
+         */
+        mousewheel: {
+            valueFn: function(){
+                var somethingToTestForAMouse = true;
+                return somethingToTestForAMouse;
+            }
         }
     },