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      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