Add wheel support to sky-scrollable

sky/engine/public/platform/WebInputEvent.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 103 matching lines @@
         GestureTapDown,
         GestureTapCancel,
         GestureDoubleTap,
         GestureTwoFingerTap,
         GestureLongPress,
         GestureLongTap,
         GesturePinchBegin,
         GesturePinchEnd,
         GesturePinchUpdate,
         GestureTypeLast = GesturePinchUpdate,
+
+        WheelEvent,
     };
 
     enum Modifiers {
         // modifiers for all events:
         ShiftKey         = 1 << 0,
         ControlKey       = 1 << 1,
         AltKey           = 1 << 2,
         MetaKey          = 1 << 3,
 
         // modifiers for keyboard events:
@@ skipping 29 matching lines @@
     double timeStampMS; // Milliseconds since epoch.
     unsigned size; // The size of this structure, for serialization.
     Type type;
     int modifiers;
 
     static bool isPointerEventType(int type)
     {
         return PointerTypeFirst <= type && type <= PointerTypeLast;
     }
 
-    // Returns true if the WebInputEvent |type| is a keyboard event.
     static bool isKeyboardEventType(int type)
     {
         return KeyboardTypeFirst <= type && type <= KeyboardTypeLast;
     }
 
-    // Returns true if the WebInputEvent is a gesture event.
     static bool isGestureEventType(int type)
     {
         return GestureTypeFirst <= type && type <= GestureTypeLast;
     }
 
+    static bool isWheelEventType(int type)
+    {
+        return type == WheelEvent;
+    }
+
 protected:
     explicit WebInputEvent(unsigned sizeParam)
     {
         memset(this, 0, sizeParam);
         timeStampMS = 0.0;
         size = sizeParam;
         type = Undefined;
         modifiers = 0;
     }
 };
@@ skipping 36 matching lines @@
 class WebKeyboardEvent : public WebInputEvent {
 public:
     // |key| is the Windows key code associated with this key
     // event.  Sometimes it's direct from the event (i.e. on Windows),
     // sometimes it's via a mapping function.  If you want a list, see
     // WebCore/platform/chromium/KeyboardCodes* . Note that this should
     // ALWAYS store the non-locational version of a keycode as this is
     // what is returned by the Windows API. For example, it should
     // store VK_SHIFT instead of VK_RSHIFT. The location information
     // should be stored in |modifiers|.
-    int key;
+    int key = 0;
 
     // |charCode| is the text generated by this keystroke.  |unmodifiedCharCode|
     // is |charCode|, but unmodified by an concurrently-held modifiers (except
     // shift).  This is useful for working out shortcut keys.
-    WebUChar charCode;
-    WebUChar unmodifiedCharCode;
+    WebUChar charCode = 0;
+    WebUChar unmodifiedCharCode = 0;
 
-    WebKeyboardEvent()
-        : WebInputEvent(sizeof(WebKeyboardEvent))
-        , key(0)
-        , charCode(0)
-        , unmodifiedCharCode(0)
-    {
-    }
+    WebKeyboardEvent() : WebInputEvent(sizeof(WebKeyboardEvent)) {}
 };
 
-// WebGestureEvent --------------------------------------------------------------
+// WebWheelEvent --------------------------------------------------------------
+
+class WebWheelEvent : public WebInputEvent {
+public:
+    float x = 0;
+    float y = 0;
+    float offsetX = 0;
+    float offsetY = 0;
+
+    WebWheelEvent() : WebInputEvent(sizeof(WebWheelEvent)) {}
+};
+
+// WebGestureEvent ------------------------------------------------------------
 
 class WebGestureEvent : public WebInputEvent {
 public:
-    int x;
-    int y;
-    int globalX;
-    int globalY;
-    WebGestureDevice sourceDevice;
+    float x = 0;
+    float y = 0;
 
     union {
         // Tap information must be set for GestureTap, GestureTapUnconfirmed,
         // and GestureDoubleTap events.
         struct {
             int tapCount;
             float width;
             float height;
         } tap;
 
@@ skipping 36 matching lines @@
             float velocityY;
         } flingStart;
 
         struct {
             float scale;
         } pinchUpdate;
     } data;
 
     WebGestureEvent()
         : WebInputEvent(sizeof(WebGestureEvent))
-        , x(0)
-        , y(0)
-        , globalX(0)
-        , globalY(0)
     {
         memset(&data, 0, sizeof(data));
     }
 };
 
 #pragma pack(pop)
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_PUBLIC_PLATFORM_WEBINPUTEVENT_H_