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   // 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_