ui/wm/public/scoped_drag_drop_disabler.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_WM_PUBLIC_SCOPED_DRAG_DROP_DISABLER_H_
   6 #define UI_WM_PUBLIC_SCOPED_DRAG_DROP_DISABLER_H_
   7
   8 #include "base/macros.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "ui/aura/window_observer.h"
  11
  12 namespace aura {
  13 class Window;
  14
  15 namespace client {
  16 class DragDropClient;
  17
  18 // ScopedDragDropDisabler is used to temporarily replace the drag'n'drop client
  19 // for a window with a "no-op" client. Upon construction, it installs a new
  20 // client on the window, and upon destruction, it restores the previous one.
  21 class AURA_EXPORT ScopedDragDropDisabler : public WindowObserver {
  22  public:
  23   explicit ScopedDragDropDisabler(Window* window);
  24   ~ScopedDragDropDisabler() override;
  25
  26  private:
  27   // WindowObserver:
  28   void OnWindowDestroyed(Window* window) override;
  29
  30   Window* window_;
  31   DragDropClient* old_client_;
  32   scoped_ptr<DragDropClient> new_client_;
  33
  34   DISALLOW_COPY_AND_ASSIGN(ScopedDragDropDisabler);
  35 };
  36
  37 }  // namespace client
  38 }  // namespace aura
  39
  40 #endif  // UI_WM_PUBLIC_SCOPED_DRAG_DROP_DISABLER_H_