1// Copyright (c) 2012 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 ASH_WM_ALWAYS_ON_TOP_CONTROLLER_H_
6#define ASH_WM_ALWAYS_ON_TOP_CONTROLLER_H_
7
8#include "base/basictypes.h"
9#include "base/compiler_specific.h"
10#include "ui/aura/window_observer.h"
11
12namespace aura {
13class Window;
14}
15
16namespace ash {
17
18// AlwaysOnTopController puts window into proper containers based on its
19// 'AlwaysOnTop' property. That is, putting a window into the worskpace
20// container if its "AlwaysOnTop" property is false. Otherwise, put it in
21// |always_on_top_container_|.
22class AlwaysOnTopController : public aura::WindowObserver {
23 public:
24  AlwaysOnTopController();
25  virtual ~AlwaysOnTopController();
26
27  // Sets the container for always on top windows.
28  void SetAlwaysOnTopContainer(aura::Window* always_on_top_container);
29
30  // Gets container for given |window| based on its "AlwaysOnTop" property.
31  aura::Window* GetContainer(aura::Window* window) const;
32
33 private:
34  // Overridden from aura::WindowObserver:
35  virtual void OnWindowAdded(aura::Window* child) OVERRIDE;
36  virtual void OnWillRemoveWindow(aura::Window* child) OVERRIDE;
37  virtual void OnWindowPropertyChanged(aura::Window* window,
38                                       const void* key,
39                                       intptr_t old) OVERRIDE;
40  virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE;
41
42  aura::Window* always_on_top_container_;
43
44  DISALLOW_COPY_AND_ASSIGN(AlwaysOnTopController);
45};
46
47}  // namepsace ash
48
49#endif  // ASH_WM_ALWAYS_ON_TOP_CONTROLLER_H_
50