+<span id='Ext-EventObject-method-correctWheelDelta'> /**
+</span> * Correctly scales a given wheel delta.
+ * @param {Number} delta The delta value.
+ */
+ correctWheelDelta : function (delta) {
+ var scale = this.WHEEL_SCALE,
+ ret = Math.round(delta / scale + 0.5);
+
+ if (!ret && delta) {
+ ret = (delta < 0) ? -1 : 1; // don't allow non-zero deltas to go to zero!
+ }
+
+ return ret;
+ },
+
+<span id='Ext-EventObject-method-getWheelDeltas'> /**
+</span> * Returns the mouse wheel deltas for this event.
+ * @return {Object} An object with "x" and "y" properties holding the mouse wheel deltas.
+ */
+ getWheelDeltas : function () {
+ var me = this,
+ event = me.browserEvent,
+ dx = 0, dy = 0; // the deltas
+
+ if (Ext.isDefined(event.wheelDeltaX)) { // WebKit has both dimensions
+ dx = event.wheelDeltaX;
+ dy = event.wheelDeltaY;
+ } else if (event.wheelDelta) { // old WebKit and IE
+ dy = event.wheelDelta;
+ } else if (event.detail) { // Gecko
+ dy = -event.detail; // gecko is backwards
+
+ // Gecko sometimes returns really big values if the user changes settings to
+ // scroll a whole page per scroll
+ if (dy > 100) {
+ dy = 3;
+ } else if (dy < -100) {
+ dy = -3;
+ }
+
+ // Firefox 3.1 adds an axis field to the event to indicate direction of
+ // scroll. See https://developer.mozilla.org/en/Gecko-Specific_DOM_Events
+ if (Ext.isDefined(event.axis) && event.axis === event.HORIZONTAL_AXIS) {
+ dx = dy;
+ dy = 0;
+ }
+ }
+
+ return {
+ x: me.correctWheelDelta(dx),
+ y: me.correctWheelDelta(dy)
+ };
+ },
+