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      1 // Copyright 2014 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 ATHENA_WM_PUBLIC_WINDOW_LIST_PROVIDER_OBSERVER_H_
      6 #define ATHENA_WM_PUBLIC_WINDOW_LIST_PROVIDER_OBSERVER_H_
      7 
      8 #include "athena/athena_export.h"
      9 
     10 namespace aura {
     11 class Window;
     12 }
     13 
     14 namespace athena {
     15 
     16 // An observer to window list changes like e.g. stacking order has changed.
     17 class ATHENA_EXPORT WindowListProviderObserver {
     18  public:
     19   virtual ~WindowListProviderObserver() {}
     20 
     21   // The Window stacking has changed.
     22   virtual void OnWindowStackingChanged() = 0;
     23 
     24   // The specified Window has been removed from the list. At the time of
     25   // removal, |removed_window| was at the |index| position in the window list.
     26   virtual void OnWindowRemoved(aura::Window* removed_window,
     27                                int index) = 0;
     28 };
     29 
     30 }  // namespace athena
     31 
     32 #endif  // ATHENA_WM_PUBLIC_WINDOW_LIST_PROVIDER_OBSERVER_H_
     33