ash/mus/root_windows_observer.h

// Copyright 2016 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 ASH_MUS_ROOT_WINDOW_OBSERVERS_H_
#define ASH_MUS_ROOT_WINDOW_OBSERVERS_H_

namespace ash {
namespace mus {

class RootWindowController;

class RootWindowsObserver {
 public:
  // Called once a new display has been created and the root Window obtained.
  virtual void OnRootWindowControllerAdded(RootWindowController* controller) {}

  // Called before a RootWindowController is destroyed.
  virtual void OnWillDestroyRootWindowController(
      RootWindowController* controller) {}

 protected:
  ~RootWindowsObserver() {}
};

}  // namespace mus
}  // namespace ash

#endif  // ASH_MUS_ROOT_WINDOW_OBSERVERS_H_