ui/wm/public/scoped_drag_drop_disabler.h

// Copyright 2015 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_WM_PUBLIC_SCOPED_DRAG_DROP_DISABLER_H_
#define UI_WM_PUBLIC_SCOPED_DRAG_DROP_DISABLER_H_

#include <memory>

#include "base/macros.h"
#include "ui/aura/window_observer.h"
#include "ui/wm/public/wm_public_export.h"

namespace aura {
class Window;

namespace client {
class DragDropClient;
}
}

namespace wm {

// ScopedDragDropDisabler is used to temporarily replace the drag'n'drop client
// for a window with a "no-op" client. Upon construction, it installs a new
// client on the window, and upon destruction, it restores the previous one.
class WM_PUBLIC_EXPORT ScopedDragDropDisabler : public aura::WindowObserver {
 public:
  explicit ScopedDragDropDisabler(aura::Window* window);
  ~ScopedDragDropDisabler() override;

 private:
  // WindowObserver:
  void OnWindowDestroyed(aura::Window* window) override;

  aura::Window* window_;
  aura::client::DragDropClient* old_client_;
  std::unique_ptr<aura::client::DragDropClient> new_client_;

  DISALLOW_COPY_AND_ASSIGN(ScopedDragDropDisabler);
};

}  // namespace wm

#endif  // UI_WM_PUBLIC_SCOPED_DRAG_DROP_DISABLER_H_