[ABANDONED] Simplify ash shelf dimmer.

ui/views/widget/drop_helper.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 "ui/views/widget/drop_helper.h"
 
 #include "build/build_config.h"
 #include "ui/base/dragdrop/drag_drop_types.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 namespace views {
 
-DropHelper::DropHelper(View* root_view)
-    : root_view_(root_view),
-      target_view_(NULL),
-      deepest_view_(NULL) {
-}
+DropHelper::DropHelper(View* root_view) : root_view_(root_view) {}
 
-DropHelper::~DropHelper() {
-}
+DropHelper::~DropHelper() {}
 
 void DropHelper::ResetTargetViewIfEquals(View* view) {
   if (target_view_ == view)
     target_view_ = NULL;
   if (deepest_view_ == view)
     deepest_view_ = NULL;
 }
 
 int DropHelper::OnDragOver(const OSExchangeData& data,
                            const gfx::Point& root_view_location,
                            int drag_operation) {
+  LOG(ERROR) << "MSW DropHelper::OnDragOver";
+  if (!drag_over_widget_)
+    root_view_->GetWidget()->OnDragEnter();
+  drag_over_widget_ = true;
+
   View* view = CalculateTargetViewImpl(root_view_location, data, true,
                                        &deepest_view_);
 
   if (view != target_view_) {
     // Target changed notify old drag exited, then new drag entered.
     NotifyDragExit();
     target_view_ = view;
     NotifyDragEntered(data, root_view_location, drag_operation);
   }
 
   return NotifyDragOver(data, root_view_location, drag_operation);
 }
 
 void DropHelper::OnDragExit() {
+  root_view_->GetWidget()->OnDragExit();
+  drag_over_widget_ = false;
   NotifyDragExit();
   deepest_view_ = target_view_ = NULL;
 }
 
 int DropHelper::OnDrop(const OSExchangeData& data,
                        const gfx::Point& root_view_location,
                        int drag_operation) {
+  root_view_->GetWidget()->OnDragExit();
+  drag_over_widget_ = false;
+
   View* drop_view = target_view_;
   deepest_view_ = target_view_ = NULL;
   if (!drop_view)
     return ui::DragDropTypes::DRAG_NONE;
 
   if (drag_operation == ui::DragDropTypes::DRAG_NONE) {
     drop_view->OnDragExited();
     return ui::DragDropTypes::DRAG_NONE;
   }
 
@@ skipping 84 matching lines @@
                                   drag_operation);
   return target_view_->OnDragUpdated(enter_event);
 }
 
 void DropHelper::NotifyDragExit() {
   if (target_view_)
     target_view_->OnDragExited();
 }
 
 }  // namespace views