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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 class AlwaysOnTopController;
     16 
     17 class ASH_EXPORT StackingController : public aura::client::WindowTreeClient {
     18  public:
     19   StackingController();
     20   virtual ~StackingController();
     21 
     22   // Overridden from aura::client::WindowTreeClient:
     23   virtual aura::Window* GetDefaultParent(aura::Window* context,
     24                                          aura::Window* window,
     25                                          const gfx::Rect& bounds) OVERRIDE;
     26 
     27  private:
     28   // Returns corresponding system modal container for a modal window.
     29   // If screen lock is not active, all system modal windows are placed into the
     30   // normal modal container.
     31   // Otherwise those that originate from LockScreen container and above are
     32   // placed in the screen lock modal container.
     33   aura::Window* GetSystemModalContainer(aura::Window* root,
     34                                         aura::Window* window) const;
     35 
     36   DISALLOW_COPY_AND_ASSIGN(StackingController);
     37 };
     38 
     39 }  // namespace ash
     40 
     41 #endif  // ASH_WM_STACKING_CONTROLLER_H_
     42