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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