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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 
12 namespace aura {
13 class Window;
14 }
15 
16 namespace ash {
17 namespace internal {
18 
19 // AlwaysOnTopController puts window into proper containers based on its
20 // 'AlwaysOnTop' property. That is, putting a window into the worskpace
21 // container if its "AlwaysOnTop" property is false. Otherwise, put it in
22 // |always_on_top_container_|.
23 class AlwaysOnTopController : public aura::WindowObserver {
24  public:
25   AlwaysOnTopController();
26   virtual ~AlwaysOnTopController();
27 
28   // Sets the container for always on top windows.
29   void SetAlwaysOnTopContainer(aura::Window* always_on_top_container);
30 
31   // Gets container for given |window| based on its "AlwaysOnTop" property.
32   aura::Window* GetContainer(aura::Window* window) const;
33 
34  private:
35   // Overridden from aura::WindowObserver:
36   virtual void OnWindowAdded(aura::Window* child) OVERRIDE;
37   virtual void OnWillRemoveWindow(aura::Window* child) OVERRIDE;
38   virtual void OnWindowPropertyChanged(aura::Window* window,
39                                        const void* key,
40                                        intptr_t old) OVERRIDE;
41   virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE;
42 
43   aura::Window* always_on_top_container_;
44 
45   DISALLOW_COPY_AND_ASSIGN(AlwaysOnTopController);
46 };
47 
48 }  // namepsace internal
49 }  // namepsace ash
50 
51 #endif  // ASH_WM_ALWAYS_ON_TOP_CONTROLLER_H_
52