1 // Copyright 2013 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_DISPLAY_DISPLAY_ERROR_OBSERVER_CHROMEOS_H_ 6 #define ASH_DISPLAY_DISPLAY_ERROR_OBSERVER_CHROMEOS_H_ 7 8 #include "ash/ash_export.h" 9 #include "base/compiler_specific.h" 10 #include "base/strings/string16.h" 11 #include "ui/display/chromeos/display_configurator.h" 12 13 namespace ash { 14 15 // The class to observe the output failures and shows the error dialog when 16 // necessary. 17 class ASH_EXPORT DisplayErrorObserver 18 : public ui::DisplayConfigurator::Observer { 19 public: 20 DisplayErrorObserver(); 21 virtual ~DisplayErrorObserver(); 22 23 // ui::DisplayConfigurator::Observer overrides: 24 virtual void OnDisplayModeChangeFailed( 25 ui::MultipleDisplayState failed_new_state) OVERRIDE; 26 27 private: 28 friend class DisplayErrorObserverTest; 29 30 base::string16 GetTitleOfDisplayErrorNotificationForTest(); 31 32 DISALLOW_COPY_AND_ASSIGN(DisplayErrorObserver); 33 }; 34 35 } // namespace ash 36 37 #endif // ASH_DISPLAY_DISPLAY_ERROR_OBSERVER_CHROMEOS_H_ 38