Revert of Refactoring button field and its type

third_party/WebKit/Source/platform/PlatformMouseEvent.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2009 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 15 matching lines @@
 #ifndef PlatformMouseEvent_h
 #define PlatformMouseEvent_h
 
 #include "platform/PlatformEvent.h"
 #include "platform/geometry/IntPoint.h"
 #include "public/platform/WebPointerProperties.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
+// These button numbers match the ones used in the DOM API, 0 through 2, except for NoButton which is specified in PointerEvent
+// spec but not in MouseEvent spec.
+enum MouseButton { NoButton = -1, LeftButton, MiddleButton, RightButton };
+
 class PlatformMouseEvent : public PlatformEvent {
 public:
     enum SyntheticEventType {
         // Real mouse input events or synthetic events that behave just like real events
         RealOrIndistinguishable,
         // Synthetic mouse events derived from touch input
         FromTouch,
         // Synthetic mouse events generated without a position, for example those generated
         // from keyboard input.
         Positionless,
     };
 
     PlatformMouseEvent()
         : PlatformEvent(PlatformEvent::MouseMoved)
+        , m_button(NoButton)
         , m_clickCount(0)
         , m_synthesized(RealOrIndistinguishable)
     {
     }
 
-    PlatformMouseEvent(const IntPoint& position, const IntPoint& globalPosition, WebPointerProperties::Button button, EventType type, int clickCount, Modifiers modifiers, double timestamp)
+    PlatformMouseEvent(const IntPoint& position, const IntPoint& globalPosition, MouseButton button, EventType type, int clickCount, Modifiers modifiers, double timestamp)
         : PlatformEvent(type, modifiers, timestamp)
         , m_position(position)
         , m_globalPosition(globalPosition)
+        , m_button(button)
         , m_clickCount(clickCount)
         , m_synthesized(RealOrIndistinguishable)
     {
-        m_pointerProperties.button = button;
     }
 
-    PlatformMouseEvent(const IntPoint& position, const IntPoint& globalPosition, WebPointerProperties::Button button, EventType type, int clickCount, Modifiers modifiers, SyntheticEventType synthesized, double timestamp, WebPointerProperties::PointerType pointerType = WebPointerProperties::PointerType::Unknown)
+    PlatformMouseEvent(const IntPoint& position, const IntPoint& globalPosition, MouseButton button, EventType type, int clickCount, Modifiers modifiers, SyntheticEventType synthesized, double timestamp, WebPointerProperties::PointerType pointerType = WebPointerProperties::PointerType::Unknown)
         : PlatformEvent(type, modifiers, timestamp)
         , m_position(position)
         , m_globalPosition(globalPosition)
+        , m_button(button)
         , m_clickCount(clickCount)
         , m_synthesized(synthesized)
     {
         m_pointerProperties.pointerType = pointerType;
-        m_pointerProperties.button = button;
     }
 
     const WebPointerProperties& pointerProperties() const { return m_pointerProperties; }
     const IntPoint& position() const { return m_position; }
     const IntPoint& globalPosition() const { return m_globalPosition; }
     const IntPoint& movementDelta() const { return m_movementDelta; }
 
+    MouseButton button() const { return m_button; }
     int clickCount() const { return m_clickCount; }
     bool fromTouch() const { return m_synthesized == FromTouch; }
     SyntheticEventType getSyntheticEventType() const { return m_synthesized; }
 
     const String& region() const { return m_region; }
     void setRegion(const String& region) { m_region = region; }
 
 protected:
     WebPointerProperties m_pointerProperties;
 
     // In local root frame coordinates. (Except possibly if the Widget under
     // the mouse is a popup, see FIXME in PlatformMouseEventBuilder).
     IntPoint m_position;
 
     // In screen coordinates.
     IntPoint m_globalPosition;
 
     IntPoint m_movementDelta;
+    MouseButton m_button;
     int m_clickCount;
     SyntheticEventType m_synthesized;
 
     // For canvas hit region.
     // TODO(zino): This might make more sense to put in HitTestResults or
     // some other part of MouseEventWithHitTestResults, but for now it's
     // most convenient to stash it here. Please see: http://crbug.com/592947.
     String m_region;
 };
 
 } // namespace blink
 
 #endif // PlatformMouseEvent_h