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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_CHANGE_OBSERVER_CHROMEOS_H
      6 #define ASH_DISPLAY_DISPLAY_CHANGE_OBSERVER_CHROMEOS_H
      7 
      8 #include "ash/ash_export.h"
      9 #include "ash/shell_observer.h"
     10 #include "base/basictypes.h"
     11 #include "chromeos/display/output_configurator.h"
     12 
     13 namespace ash {
     14 namespace internal {
     15 
     16 struct Resolution;
     17 
     18 // An object that observes changes in display configuration and
     19 // update DisplayManagers.
     20 class DisplayChangeObserver
     21     : public chromeos::OutputConfigurator::StateController,
     22       public chromeos::OutputConfigurator::Observer,
     23       public ShellObserver {
     24  public:
     25   // Returns the resolution list.
     26   ASH_EXPORT static std::vector<Resolution> GetResolutionList(
     27       const chromeos::OutputConfigurator::OutputSnapshot& output);
     28 
     29   DisplayChangeObserver();
     30   virtual ~DisplayChangeObserver();
     31 
     32   // chromeos::OutputConfigurator::StateController overrides:
     33   virtual chromeos::OutputState GetStateForDisplayIds(
     34       const std::vector<int64>& outputs) const OVERRIDE;
     35   virtual bool GetResolutionForDisplayId(int64 display_id,
     36                                          int* width,
     37                                          int* height) const OVERRIDE;
     38 
     39   // Overriden from chromeos::OutputConfigurator::Observer:
     40   virtual void OnDisplayModeChanged(
     41       const std::vector<chromeos::OutputConfigurator::OutputSnapshot>& outputs)
     42       OVERRIDE;
     43 
     44   // Overriden from ShellObserver:
     45   virtual void OnAppTerminating() OVERRIDE;
     46 
     47  private:
     48   DISALLOW_COPY_AND_ASSIGN(DisplayChangeObserver);
     49 };
     50 
     51 }  // namespace internal
     52 }  // namespace ash
     53 
     54 #endif  // ASH_DISPLAY_AURA_DISPLAY_CHANGE_OBSERVER_CHROMEOS_H
     55