ui/aura/client/activation_change_observer.h

   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  protected:
  25   virtual ~ActivationChangeObserver() {}
  26 };
  27
  28 // Gets/Sets the ActivationChangeObserver for a specific window. This observer
  29 // is notified after the ActivationClient notifies all registered observers.
  30 AURA_EXPORT void SetActivationChangeObserver(
  31     Window* window,
  32     ActivationChangeObserver* observer);
  33 AURA_EXPORT ActivationChangeObserver* GetActivationChangeObserver(
  34     Window* window);
  35
  36 }  // namespace client
  37 }  // namespace aura
  38
  39 #endif  // UI_AURA_CLIENT_ACTIVATION_CHANGE_OBSERVER_H_