feat: Stage.mouseWheelScale

Author: xiaoguzhu

Assets/Scripts/Core/Stage.cs

@@ -192,6 +192,14 @@ public static float devicePixelRatio
             get; set;
         }
 
+        /// <summary>
+        /// The scale of the mouse scroll delta.
+        /// </summary>
+        public static float mouseWheelScale
+        {
+            get; set;
+        }
+
         /// <summary>
         /// 
         /// </summary>
@@ -231,6 +239,7 @@ public Stage() : base()
 
             // 在PC上，是否retina屏对输入法位置，鼠标滚轮速度都有影响，但现在没发现Unity有获得的方式。仅判断是否Mac可能不够（外接显示器的情况）。所以最好自行设置。
             devicePixelRatio = (isOSX && Screen.dpi > 96) ? 2 : 1;
+            mouseWheelScale = 1;
 
             _rollOutChain = new List<DisplayObject>();
             _rollOverChain = new List<DisplayObject>();
@@ -976,7 +985,7 @@ internal void HandleGUIEvents(Event evt)
                 if (_touchTarget != null)
                 {
                     TouchInfo touch = _touches[0];
-                    touch.mouseWheelDelta = evt.delta.y;
+                    touch.mouseWheelDelta = evt.delta.y * Stage.mouseWheelScale;
                     touch.UpdateEvent();
                     _touchTarget.BubbleEvent("onMouseWheel", touch.evt);
                     touch.mouseWheelDelta = 0;