Refactoring button field and its type

content/browser/renderer_host/input/web_input_event_builders_mac.mm

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006-2009 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ skipping 318 matching lines @@
 
 blink::WebMouseEvent WebMouseEventBuilder::Build(NSEvent* event, NSView* view) {
   blink::WebMouseEvent result;
 
   result.clickCount = 0;
 
   NSEventType type = [event type];
   switch (type) {
     case NSMouseExited:
       result.type = blink::WebInputEvent::MouseLeave;
-      result.button = blink::WebMouseEvent::ButtonNone;
+      result.button = blink::WebMouseEvent::Button::NoButton;
       break;
     case NSLeftMouseDown:
       result.type = blink::WebInputEvent::MouseDown;
       result.clickCount = [event clickCount];
-      result.button = blink::WebMouseEvent::ButtonLeft;
+      result.button = blink::WebMouseEvent::Button::Left;
       break;
     case NSOtherMouseDown:
       result.type = blink::WebInputEvent::MouseDown;
       result.clickCount = [event clickCount];
-      result.button = blink::WebMouseEvent::ButtonMiddle;
+      result.button = blink::WebMouseEvent::Button::Middle;
       break;
     case NSRightMouseDown:
       result.type = blink::WebInputEvent::MouseDown;
       result.clickCount = [event clickCount];
-      result.button = blink::WebMouseEvent::ButtonRight;
+      result.button = blink::WebMouseEvent::Button::Right;
       break;
     case NSLeftMouseUp:
       result.type = blink::WebInputEvent::MouseUp;
       result.clickCount = [event clickCount];
-      result.button = blink::WebMouseEvent::ButtonLeft;
+      result.button = blink::WebMouseEvent::Button::Left;
       break;
     case NSOtherMouseUp:
       result.type = blink::WebInputEvent::MouseUp;
       result.clickCount = [event clickCount];
-      result.button = blink::WebMouseEvent::ButtonMiddle;
+      result.button = blink::WebMouseEvent::Button::Middle;
       break;
     case NSRightMouseUp:
       result.type = blink::WebInputEvent::MouseUp;
       result.clickCount = [event clickCount];
-      result.button = blink::WebMouseEvent::ButtonRight;
+      result.button = blink::WebMouseEvent::Button::Right;
       break;
     case NSMouseMoved:
     case NSMouseEntered:
       result.type = blink::WebInputEvent::MouseMove;
       break;
     case NSLeftMouseDragged:
       result.type = blink::WebInputEvent::MouseMove;
-      result.button = blink::WebMouseEvent::ButtonLeft;
+      result.button = blink::WebMouseEvent::Button::Left;
       break;
     case NSOtherMouseDragged:
       result.type = blink::WebInputEvent::MouseMove;
-      result.button = blink::WebMouseEvent::ButtonMiddle;
+      result.button = blink::WebMouseEvent::Button::Middle;
       break;
     case NSRightMouseDragged:
       result.type = blink::WebInputEvent::MouseMove;
-      result.button = blink::WebMouseEvent::ButtonRight;
+      result.button = blink::WebMouseEvent::Button::Right;
       break;
     default:
       NOTIMPLEMENTED();
   }
 
   SetWebEventLocationFromEventInView(&result, event, view);
 
   result.modifiers = ModifiersFromEvent(event);
 
   result.timeStampSeconds = [event timestamp];
@@ skipping 21 matching lines @@
 }
 
 // WebMouseWheelEvent ---------------------------------------------------------
 
 blink::WebMouseWheelEvent WebMouseWheelEventBuilder::Build(
     NSEvent* event,
     NSView* view) {
   blink::WebMouseWheelEvent result;
 
   result.type = blink::WebInputEvent::MouseWheel;
-  result.button = blink::WebMouseEvent::ButtonNone;
+  result.button = blink::WebMouseEvent::Button::NoButton;
 
   result.modifiers = ModifiersFromEvent(event);
 
   SetWebEventLocationFromEventInView(&result, event, view);
 
   // Of Mice and Men
   // ---------------
   //
   // There are three types of scroll data available on a scroll wheel CGEvent.
   // Apple's documentation ([1]) is rather vague in their differences, and not
@@ skipping 169 matching lines @@
       break;
     default:
       NOTIMPLEMENTED();
       result.type = blink::WebInputEvent::Undefined;
   }
 
   return result;
 }
 
 }  // namespace content