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      1 // Copyright 2013 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 UI_VIEWS_WIDGET_WINDOW_REORDERER_H_
      6 #define UI_VIEWS_WIDGET_WINDOW_REORDERER_H_
      7 
      8 #include "base/compiler_specific.h"
      9 #include "base/memory/scoped_ptr.h"
     10 #include "ui/aura/window_observer.h"
     11 
     12 namespace aura {
     13 class Window;
     14 }
     15 
     16 namespace views {
     17 class View;
     18 
     19 // Class which reorders the widget's child windows which have an associated view
     20 // in the widget's view tree according the z-order of the views in the view
     21 // tree. Windows not associated to a view are stacked above windows with an
     22 // associated view. The child windows' layers are additionally reordered
     23 // according to the z-order of the associated views relative to views with
     24 // layers.
     25 class WindowReorderer : public aura::WindowObserver {
     26  public:
     27   WindowReorderer(aura::Window* window, View* root_view);
     28   virtual ~WindowReorderer();
     29 
     30   // Explicitly reorder the children of |window_| (and their layers). This
     31   // method should be called when the position of a view with an associated
     32   // window changes in the view hierarchy. This method assumes that the
     33   // child layers of |window_| which are owned by views are already in the
     34   // correct z-order relative to each other and does no reordering if there
     35   // are no views with an associated window.
     36   void ReorderChildWindows();
     37 
     38  private:
     39   // aura::WindowObserver overrides:
     40   virtual void OnWindowAdded(aura::Window* new_window) OVERRIDE;
     41   virtual void OnWillRemoveWindow(aura::Window* window) OVERRIDE;
     42   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
     43 
     44   // The window and the root view of the native widget which owns the
     45   // WindowReorderer.
     46   aura::Window* parent_window_;
     47   View* root_view_;
     48 
     49   // Reorders windows as a result of the kHostViewKey being set on a child of
     50   // |parent_window_|.
     51   class AssociationObserver;
     52   scoped_ptr<AssociationObserver> association_observer_;
     53 
     54   DISALLOW_COPY_AND_ASSIGN(WindowReorderer);
     55 };
     56 
     57 }  // namespace views
     58 
     59 #endif  // UI_VIEWS_WIDGET_WINDOW_REORDERER_H_
     60