ui/aura/client/transient_window_client_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 UI_AURA_CLIENT_TRANSIENT_WINDOW_CLIENT_OBSERVER_H_
#define UI_AURA_CLIENT_TRANSIENT_WINDOW_CLIENT_OBSERVER_H_

#include "ui/aura/aura_export.h"

namespace aura {

class Window;

namespace client {

class AURA_EXPORT TransientWindowClientObserver {
 public:
  // Called when a window is added as a transient child. This is called once
  // the child is added as a transient, but before any restacking occurs.
  virtual void OnTransientChildWindowAdded(Window* parent,
                                           Window* transient_child) = 0;

  // Called when a window is removed as a transient child. This is called once
  // the child is removed as a transient, but before any restacking occurs.
  virtual void OnTransientChildWindowRemoved(Window* parent,
                                             Window* transient_child) = 0;

  // Called when adding or removing a transient results in restacking.
  // |transient_child| is the window being stacked above |parent|. |parent| is
  // the window the transient was added or removed from. This is followed by a
  // call to Window::StackChildAbove() and then
  // OnDidRestackTransientChildAbove().
  virtual void OnWillRestackTransientChildAbove(Window* parent,
                                                Window* transient_child) = 0;
  virtual void OnDidRestackTransientChildAbove(Window* parent,
                                               Window* transient_child) = 0;

 protected:
  virtual ~TransientWindowClientObserver() {}
};

}  // namespace client
}  // namespace aura

#endif  // UI_AURA_CLIENT_TRANSIENT_WINDOW_CLIENT_OBSERVER_H_