// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_WM_CORE_TRANSIENT_WINDOW_STACKING_CLIENT_H_
#define UI_WM_CORE_TRANSIENT_WINDOW_STACKING_CLIENT_H_

#include "base/component_export.h"
#include "ui/aura/client/window_stacking_client.h"

namespace wm {

class TransientWindowManager;

class COMPONENT_EXPORT(UI_WM) TransientWindowStackingClient
    : public aura::client::WindowStackingClient {
 public:
  TransientWindowStackingClient();

  TransientWindowStackingClient(const TransientWindowStackingClient&) = delete;
  TransientWindowStackingClient& operator=(
      const TransientWindowStackingClient&) = delete;

  ~TransientWindowStackingClient() override;

  // WindowStackingClient:
  bool AdjustStacking(aura::Window** child,
                      aura::Window** target,
                      aura::Window::StackDirection* direction) override;

 private:
  // Purely for DCHECKs.
  friend class TransientWindowManager;

  static TransientWindowStackingClient* instance_;
};

}  // namespace wm

#endif  // UI_WM_CORE_TRANSIENT_WINDOW_STACKING_CLIENT_H_