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 ASH_SHELL_OBSERVER_H_ 6 #define ASH_SHELL_OBSERVER_H_ 7 8 #include "ash/ash_export.h" 9 #include "ash/system/user/login_status.h" 10 11 namespace aura { 12 class RootWindow; 13 } 14 15 namespace ash { 16 17 class ASH_EXPORT ShellObserver { 18 public: 19 // Invoked after the screen's work area insets changes. 20 virtual void OnDisplayWorkAreaInsetsChanged() {} 21 22 // Invoked when the user logs in. 23 virtual void OnLoginStateChanged(user::LoginStatus status) {} 24 25 // Invoked when the application is exiting. 26 virtual void OnAppTerminating() {} 27 28 // Invoked when the screen is locked (after the lock window is visible) or 29 // unlocked. 30 virtual void OnLockStateChanged(bool locked) {} 31 32 // Invoked when the shelf alignment in |root_window| is changed. 33 virtual void OnShelfAlignmentChanged(aura::RootWindow* root_window) {} 34 35 // Invoked when the projection touch HUD is toggled. 36 virtual void OnTouchHudProjectionToggled(bool enabled) {} 37 38 protected: 39 virtual ~ShellObserver() {} 40 }; 41 42 } // namespace ash 43 44 #endif // ASH_SHELL_OBSERVER_H_ 45