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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_STACKING_CONTROLLER_H_
      6 #define ASH_WM_STACKING_CONTROLLER_H_
      7 
      8 #include "ash/ash_export.h"
      9 #include "base/basictypes.h"
     10 #include "base/compiler_specific.h"
     11 #include "base/memory/scoped_ptr.h"
     12 #include "ui/aura/client/window_tree_client.h"
     13 
     14 namespace ash {
     15 namespace internal {
     16 class AlwaysOnTopController;
     17 }
     18 
     19 class ASH_EXPORT StackingController : public aura::client::WindowTreeClient {
     20  public:
     21   StackingController();
     22   virtual ~StackingController();
     23 
     24   // Overridden from aura::client::WindowTreeClient:
     25   virtual aura::Window* GetDefaultParent(aura::Window* context,
     26                                          aura::Window* window,
     27                                          const gfx::Rect& bounds) OVERRIDE;
     28 
     29  private:
     30   // Returns corresponding system modal container for a modal window.
     31   // If screen lock is not active, all system modal windows are placed into the
     32   // normal modal container.
     33   // Otherwise those that originate from LockScreen container and above are
     34   // placed in the screen lock modal container.
     35   aura::Window* GetSystemModalContainer(aura::Window* root,
     36                                         aura::Window* window) const;
     37 
     38   DISALLOW_COPY_AND_ASSIGN(StackingController);
     39 };
     40 
     41 }  // namespace ash
     42 
     43 #endif  // ASH_WM_STACKING_CONTROLLER_H_
     44