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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 UI_WM_CORE_TRANSIENT_WINDOW_OBSERVER_H_
      6 #define UI_WM_CORE_TRANSIENT_WINDOW_OBSERVER_H_
      7 
      8 #include "ui/wm/wm_export.h"
      9 
     10 namespace aura {
     11 class Window;
     12 }
     13 
     14 namespace wm {
     15 
     16 class WM_EXPORT TransientWindowObserver {
     17  public:
     18   // Called when a transient child is added to |window|.
     19   virtual void OnTransientChildAdded(aura::Window* window,
     20                                      aura::Window* transient) = 0;
     21 
     22   // Called when a transient child is removed from |window|.
     23   virtual void OnTransientChildRemoved(aura::Window* window,
     24                                        aura::Window* transient) = 0;
     25 
     26  protected:
     27   virtual ~TransientWindowObserver() {}
     28 };
     29 
     30 }  // namespace wm
     31 
     32 #endif  // UI_WM_CORE_TRANSIENT_WINDOW_OBSERVER_H_
     33