Disallows dragging from the bookmark bar when the bookmark bar is...

chrome/views/view_win.cc

 // Copyright (c) 2009 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 "chrome/views/view.h"
 
 #include "base/scoped_handle.h"
 #include "base/string_util.h"
+#include "chrome/common/drag_drop_types.h"
 #include "chrome/common/gfx/chrome_canvas.h"
 #include "chrome/common/gfx/path.h"
 #include "chrome/common/os_exchange_data.h"
 #include "chrome/views/accessibility/accessible_wrapper.h"
 #include "chrome/views/border.h"
 #include "chrome/views/root_view.h"
 #include "chrome/views/widget.h"
 
 namespace views {
 
 FocusManager* View::GetFocusManager() {
   Widget* widget = GetWidget();
   if (!widget)
     return NULL;
 
   HWND hwnd = widget->GetNativeView();
   if (!hwnd)
     return NULL;
 
   return FocusManager::GetFocusManager(hwnd);
 }
 
 void View::DoDrag(const MouseEvent& e, int press_x, int press_y) {
+  int drag_operations = GetDragOperations(press_x, press_y);
+  if (drag_operations == DragDropTypes::DRAG_NONE)
+    return;
+
   scoped_refptr<OSExchangeData> data = new OSExchangeData;
   WriteDragData(press_x, press_y, data.get());
 
   // Message the RootView to do the drag and drop. That way if we're removed
   // the RootView can detect it and avoid calling us back.
   RootView* root_view = GetRootView();
-  root_view->StartDragForViewFromMouseEvent(
-      this, data, GetDragOperations(press_x, press_y));
+  root_view->StartDragForViewFromMouseEvent(this, data, drag_operations);
 }
 
 AccessibleWrapper* View::GetAccessibleWrapper() {
   if (accessibility_.get() == NULL) {
     accessibility_.reset(new AccessibleWrapper(this));
   }
   return accessibility_.get();
 }
 
 bool View::HitTest(const gfx::Point& l) const {
@@ skipping 32 matching lines @@
 }
 
 int View::GetVerticalDragThreshold() {
   static int threshold = -1;
   if (threshold == -1)
     threshold = GetSystemMetrics(SM_CYDRAG) / 2;
   return threshold;
 }
 
 }  // namespace views