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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 UI_AURA_CLIENT_ACTIVATION_CHANGE_OBSERVER_H_
      6 #define UI_AURA_CLIENT_ACTIVATION_CHANGE_OBSERVER_H_
      7 
      8 #include "ui/aura/aura_export.h"
      9 
     10 namespace aura {
     11 class Window;
     12 
     13 namespace client {
     14 
     15 class AURA_EXPORT ActivationChangeObserver {
     16  public:
     17   // Called when |active| gains focus, or there is no active window
     18   // (|active| is NULL in this case.) |old_active| refers to the
     19   // previous active window or NULL if there was no previously active
     20   // window.
     21   virtual void OnWindowActivated(Window* gained_active,
     22                                  Window* lost_active) = 0;
     23 
     24   // Called when during window activation the currently active window is
     25   // selected for activation. This can happen when a window requested for
     26   // activation cannot be activated because a system modal window is active.
     27   virtual void OnAttemptToReactivateWindow(aura::Window* request_active,
     28                                            aura::Window* actual_active) {}
     29 
     30  protected:
     31   virtual ~ActivationChangeObserver() {}
     32 };
     33 
     34 // Gets/Sets the ActivationChangeObserver for a specific window. This observer
     35 // is notified after the ActivationClient notifies all registered observers.
     36 AURA_EXPORT void SetActivationChangeObserver(
     37     Window* window,
     38     ActivationChangeObserver* observer);
     39 AURA_EXPORT ActivationChangeObserver* GetActivationChangeObserver(
     40     Window* window);
     41 
     42 }  // namespace client
     43 }  // namespace aura
     44 
     45 #endif  // UI_AURA_CLIENT_ACTIVATION_CHANGE_OBSERVER_H_
     46