ash/display/display_change_observer_chromeos.h

   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 "ui/display/chromeos/display_configurator.h"
  12
  13 namespace ash {
  14
  15 class DisplayInfo;
  16 struct DisplayMode;
  17
  18 // An object that observes changes in display configuration and
  19 // update DisplayManagers.
  20 class DisplayChangeObserver : public ui::DisplayConfigurator::StateController,
  21                               public ui::DisplayConfigurator::Observer,
  22                               public ShellObserver {
  23  public:
  24   // Returns the mode list for internal display.
  25   ASH_EXPORT static std::vector<DisplayMode> GetInternalDisplayModeList(
  26       const DisplayInfo& display_info,
  27       const ui::DisplayConfigurator::DisplayState& output);
  28
  29   // Returns the resolution list.
  30   ASH_EXPORT static std::vector<DisplayMode> GetExternalDisplayModeList(
  31       const ui::DisplayConfigurator::DisplayState& output);
  32
  33   DisplayChangeObserver();
  34   virtual ~DisplayChangeObserver();
  35
  36   // ui::DisplayConfigurator::StateController overrides:
  37   virtual ui::MultipleDisplayState GetStateForDisplayIds(
  38       const std::vector<int64>& outputs) const OVERRIDE;
  39   virtual bool GetResolutionForDisplayId(int64 display_id,
  40                                          gfx::Size* size) const OVERRIDE;
  41
  42   // Overriden from ui::DisplayConfigurator::Observer:
  43   virtual void OnDisplayModeChanged(
  44       const ui::DisplayConfigurator::DisplayStateList& outputs) OVERRIDE;
  45
  46   // Overriden from ShellObserver:
  47   virtual void OnAppTerminating() OVERRIDE;
  48
  49   // Exposed for testing.
  50   ASH_EXPORT static float FindDeviceScaleFactor(float dpi);
  51
  52  private:
  53   DISALLOW_COPY_AND_ASSIGN(DisplayChangeObserver);
  54 };
  55
  56 }  // namespace ash
  57
  58 #endif  // ASH_DISPLAY_AURA_DISPLAY_CHANGE_OBSERVER_CHROMEOS_H