Get drag and drop working for win aura.

ui/views/widget/desktop_aura/desktop_drag_drop_client_win.h

+// 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.
+
+#ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_DRAG_DROP_CLIENT_WIN_H_
+#define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_DRAG_DROP_CLIENT_WIN_H_
+
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "ui/aura/client/drag_drop_client.h"
+#include "ui/views/views_export.h"
+
+namespace ui {
+class DragSource;
+class RootWindow;
+}
+
+namespace views {
+class DesktopDragDragSourceWin;
+class DesktopDropTargetWin;
+
+class VIEWS_EXPORT DesktopDragDropClientWin
+    : public aura::client::DragDropClient {
+ public:
+  DesktopDragDropClientWin(aura::RootWindow* root_window, HWND window);
+  virtual ~DesktopDragDropClientWin();
+
+  // Overridden from aura::client::DragDropClient:
+  virtual int StartDragAndDrop(
+      const ui::OSExchangeData& data,
+      aura::RootWindow* root_window,
+      aura::Window* source_window,
+      const gfx::Point& root_location,
+      int operation,
+      ui::DragDropTypes::DragEventSource source) OVERRIDE;
+  virtual void DragUpdate(aura::Window* target,
+                          const ui::LocatedEvent& event) OVERRIDE;
+  virtual void Drop(aura::Window* target,
+                    const ui::LocatedEvent& event) OVERRIDE;
+  virtual void DragCancel() OVERRIDE;
+  virtual bool IsDragDropInProgress() OVERRIDE;
+
+  void OnNativeWidgetDestroying(HWND window);
+
+ private:
+  bool drag_drop_in_progress_;
+
+  int drag_operation_;
+
+  scoped_refptr<ui::DragSource> drag_source_;
+
+  scoped_refptr<DesktopDropTargetWin> drop_target_;
+
+  DISALLOW_COPY_AND_ASSIGN(DesktopDragDropClientWin);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_DRAG_DROP_CLIENT_WIN_H_