Revert "views: Move widget/ directory to ui/views." properly.

views/widget/drop_target_win.h

+// Copyright (c) 2010 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.
+
+#ifndef VIEWS_WIDGET_DROP_TARGET_WIN_H_
+#define VIEWS_WIDGET_DROP_TARGET_WIN_H_
+#pragma once
+
+#include "ui/base/dragdrop/drop_target.h"
+#include "views/widget/drop_helper.h"
+
+namespace views {
+
+class View;
+namespace internal {
+class RootView;
+}
+
+// DropTargetWin takes care of managing drag and drop for NativeWidgetWin. It
+// converts Windows OLE drop messages into Views drop messages.
+//
+// DropTargetWin uses DropHelper to manage the appropriate view to target
+// drop messages at.
+class DropTargetWin : public ui::DropTarget {
+ public:
+  explicit DropTargetWin(internal::RootView* root_view);
+  virtual ~DropTargetWin();
+
+  // If a drag and drop is underway and view is the current drop target, the
+  // drop target is set to null.
+  // This is invoked when a View is removed from the RootView to make sure
+  // we don't target a view that was removed during dnd.
+  void ResetTargetViewIfEquals(View* view);
+
+ protected:
+  virtual DWORD OnDragOver(IDataObject* data_object,
+                           DWORD key_state,
+                           POINT cursor_position,
+                           DWORD effect);
+
+  virtual void OnDragLeave(IDataObject* data_object);
+
+  virtual DWORD OnDrop(IDataObject* data_object,
+                       DWORD key_state,
+                       POINT cursor_position,
+                       DWORD effect);
+
+ private:
+  views::DropHelper helper_;
+
+  DISALLOW_COPY_AND_ASSIGN(DropTargetWin);
+};
+
+}  // namespace views
+
+#endif  // VIEWS_WIDGET_DROP_TARGET_WIN_H_