Ignore (fake) mouse events that are created during a touch (iff we will handle the touch elsewhere.)

content/browser/renderer_host/render_widget_host_view_win.cc

 // Copyright (c) 2012 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 "content/browser/renderer_host/render_widget_host_view_win.h"
 
 #include <algorithm>
 #include <peninputpanel_i.c>
 
 #include "base/bind.h"
@@ skipping 46 matching lines @@
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/gdi_util.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/screen.h"
 #include "webkit/glue/webaccessibility.h"
 #include "webkit/glue/webcursor.h"
 #include "webkit/plugins/npapi/plugin_constants_win.h"
 #include "webkit/plugins/npapi/webplugin.h"
 #include "webkit/plugins/npapi/webplugin_delegate_impl.h"
 
+// From MSDN.
+#define MOUSEEVENTF_FROMTOUCH 0xFF515700
+
 using base::TimeDelta;
 using base::TimeTicks;
 using content::BrowserThread;
 using content::NativeWebKeyboardEvent;
 using content::RenderWidgetHost;
 using content::RenderWidgetHostImpl;
 using content::RenderWidgetHostView;
 using ui::ViewProp;
 using WebKit::WebInputEvent;
 using WebKit::WebInputEventFactory;
@@ skipping 1712 matching lines @@
     default:
       handled = FALSE;
       return 0;
   }
 }
 
 LRESULT RenderWidgetHostViewWin::OnMouseEvent(UINT message, WPARAM wparam,
                                               LPARAM lparam, BOOL& handled) {
   handled = TRUE;
 
+  // Windows sends (fake) mouse messages for touch events.  Ignore these since
+  // we're processing WM_TOUCH elsewhere.
+  if (touch_events_enabled_ &&
+      (message == WM_LBUTTONDOWN || message == WM_LBUTTONUP ||
+      message == WM_RBUTTONDOWN || message == WM_RBUTTONUP) &&

[sky, 2012/05/31 00:44:14]

nit: indent this line one more space.

+      (GetMessageExtraInfo() & MOUSEEVENTF_FROMTOUCH) ==
+      MOUSEEVENTF_FROMTOUCH)
+    return 0;
+
   if (message == WM_MOUSELEAVE)
     ignore_mouse_movement_ = true;
 
   if (mouse_locked_) {
     HandleLockedMouseEvent(message, wparam, lparam);
     MoveCursorToCenterIfNecessary();
     return 0;
   }
 
   if (::IsWindow(tooltip_hwnd_)) {
@@ skipping 1201 matching lines @@
 void RenderWidgetHostViewWin::ResetPointerDownContext() {
   // If the default focus on the page is on an edit field and we did not
   // receive a focus change in the context of a pointer down message, it means
   // that the pointer down message occurred on the edit field and we should
   // display the on screen keyboard
   if (!received_focus_change_after_pointer_down_ && virtual_keyboard_)
     DisplayOnScreenKeyboardIfNeeded();
   received_focus_change_after_pointer_down_ = false;
   pointer_down_context_ = false;
 }