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_WM_PUBLIC_ACTIVATION_CHANGE_OBSERVER_H_ 6 #define UI_WM_PUBLIC_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. OnAttemptToReactivateWindow(aura::Window * request_active,aura::Window * actual_active)27 virtual void OnAttemptToReactivateWindow(aura::Window* request_active, 28 aura::Window* actual_active) {} 29 30 protected: ~ActivationChangeObserver()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_WM_PUBLIC_ACTIVATION_CHANGE_OBSERVER_H_ 46