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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 "chromeos/display/output_configurator.h"
     12 
     13 namespace ash {
     14 namespace internal {
     15 
     16 // The class to observe the output failures and shows the error dialog when
     17 // necessary.
     18 class ASH_EXPORT DisplayErrorObserver
     19     : public chromeos::OutputConfigurator::Observer {
     20  public:
     21   DisplayErrorObserver();
     22   virtual ~DisplayErrorObserver();
     23 
     24   // chromeos::OutputConfigurator::Observer overrides:
     25   virtual void OnDisplayModeChangeFailed(
     26       chromeos::OutputState failed_new_state) OVERRIDE;
     27 
     28  private:
     29   friend class DisplayErrorObserverTest;
     30 
     31   base::string16 GetTitleOfDisplayErrorNotificationForTest();
     32 
     33   DISALLOW_COPY_AND_ASSIGN(DisplayErrorObserver);
     34 };
     35 
     36 }  // namespace internal
     37 }  // namespace ash
     38 
     39 #endif  // ASH_DISPLAY_DISPLAY_ERROR_OBSERVER_CHROMEOS_H_
     40