Add support for new scroll valuators coming from CMT

ui/base/x/events_x.cc

 // Copyright (c) 2011 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.
 
 #include "ui/base/events.h"
 
 #include <X11/Xlib.h>
 #include <X11/extensions/XInput2.h>
 #include <string.h>
 
 #include "base/logging.h"
 #include "ui/base/keycodes/keyboard_code_conversion_x.h"
 #include "ui/base/touch/touch_factory.h"
+#include "ui/base/x/scroll_factory.h"
 #include "ui/base/x/x11_util.h"
 #include "ui/gfx/point.h"
 
 #if !defined(TOOLKIT_USES_GTK)
 #include "base/message_pump_x.h"
 #endif
 
 namespace {
 
 // Scroll amount for each wheelscroll event. 53 is also the value used for GTK+.
@@ skipping 161 matching lines @@
       return ET_MOUSE_MOVED;
     case EnterNotify:
       return ET_MOUSE_ENTERED;
     case LeaveNotify:
       return ET_MOUSE_EXITED;
     case GenericEvent: {
       XIDeviceEvent* xievent =
           static_cast<XIDeviceEvent*>(native_event->xcookie.data);
       if (TouchFactory::GetInstance()->IsTouchDevice(xievent->sourceid))
         return GetTouchEventType(native_event);
-      int button = EventButtonFromNative(native_event);
       switch (xievent->evtype) {
         case XI_ButtonPress:
-          if (button >= kMinWheelButton &&
-              button <= kMaxWheelButton)
+        case XI_ButtonRelease: {
+          int button = EventButtonFromNative(native_event);
+          if (button >= kMinWheelButton && button <= kMaxWheelButton)
             return ET_MOUSEWHEEL;
-          return ET_MOUSE_PRESSED;
-        case XI_ButtonRelease:
-          if (button >= kMinWheelButton &&
-              button <= kMaxWheelButton)
-            return ET_MOUSEWHEEL;
-          return ET_MOUSE_RELEASED;
+          return xievent->evtype == XI_ButtonPress ?
+              ET_MOUSE_PRESSED : ET_MOUSE_RELEASED;
+        }
         case XI_Motion:
-          return GetButtonMaskForX2Event(xievent) ?
-              ET_MOUSE_DRAGGED : ET_MOUSE_MOVED;
+          if (GetScrollOffsets(native_event, NULL, NULL))
+            return ET_SCROLL;
+          else if (GetButtonMaskForX2Event(xievent))
+            return ET_MOUSE_DRAGGED;
+          else
+            return ET_MOUSE_MOVED;
       }
     }
     default:
       break;
   }
   return ET_UNKNOWN;
 }
 
 int EventFlagsFromNative(const base::NativeEvent& native_event) {
   switch (native_event->type) {
@@ skipping 178 matching lines @@
                                   0.0);
   unsigned int deviceid =
       static_cast<XIDeviceEvent*>(native_event->xcookie.data)->sourceid;
   // Force is normalized to fall into [0, 1]
   if (!ui::TouchFactory::GetInstance()->NormalizeTouchParam(
       deviceid, ui::TouchFactory::TP_PRESSURE, &force))
     force = 0.0;
   return force;
 }
 
+bool GetScrollOffsets(const base::NativeEvent& native_event,
+                      float* x_offset,
+                      float* y_offset) {
+  return ui::ScrollFactory::GetInstance()->GetScrollOffsets(
+      *native_event, x_offset, y_offset);
+}
+
 base::NativeEvent CreateNoopEvent() {
   static XEvent* noop = NULL;
   if (!noop) {
     noop = new XEvent();
     memset(noop, 0, sizeof(XEvent));
     noop->xclient.type = ClientMessage;
     noop->xclient.window = None;
     noop->xclient.format = 8;
     DCHECK(!noop->xclient.display);
   }
   // TODO(oshima): Remove ifdef once gtk is removed from views.
 #if defined(TOOLKIT_USES_GTK)
   NOTREACHED();
 #else
   // Make sure we use atom from current xdisplay, which may
   // change during the test.
   noop->xclient.message_type = XInternAtom(
       base::MessagePumpX::GetDefaultXDisplay(),
       "noop", False);
 #endif
   return noop;
 }
 
 }  // namespace ui