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 <vector>
   9
  10 #include "ash/ash_export.h"
  11 #include "ash/shell_observer.h"
  12 #include "base/basictypes.h"
  13 #include "ui/display/chromeos/display_configurator.h"
  14 #include "ui/events/devices/input_device_event_observer.h"
  15
  16 namespace ash {
  17
  18 class DisplayInfo;
  19 struct DisplayMode;
  20 class DisplaySnapshot;
  21
  22 // An object that observes changes in display configuration and
  23 // update DisplayManagers.
  24 class DisplayChangeObserver : public ui::DisplayConfigurator::StateController,
  25                               public ui::DisplayConfigurator::Observer,
  26                               public ui::InputDeviceEventObserver,
  27                               public ShellObserver {
  28  public:
  29   // Returns the mode list for internal display.
  30   ASH_EXPORT static std::vector<DisplayMode> GetInternalDisplayModeList(
  31       const DisplayInfo& display_info,
  32       const ui::DisplaySnapshot& output);
  33
  34   // Returns the resolution list.
  35   ASH_EXPORT static std::vector<DisplayMode> GetExternalDisplayModeList(
  36       const ui::DisplaySnapshot& output);
  37
  38   DisplayChangeObserver();
  39   ~DisplayChangeObserver() override;
  40
  41   // ui::DisplayConfigurator::StateController overrides:
  42   ui::MultipleDisplayState GetStateForDisplayIds(
  43       const ui::DisplayConfigurator::DisplayStateList& outputs) const override;
  44   bool GetResolutionForDisplayId(int64 display_id,
  45                                  gfx::Size* size) const override;
  46
  47   // Overriden from ui::DisplayConfigurator::Observer:
  48   void OnDisplayModeChanged(
  49       const ui::DisplayConfigurator::DisplayStateList& outputs) override;
  50   void OnDisplayModeChangeFailed(
  51       const ui::DisplayConfigurator::DisplayStateList& displays,
  52       ui::MultipleDisplayState failed_new_state) override;
  53
  54   // Overriden from ui::InputDeviceEventObserver:
  55   void OnTouchscreenDeviceConfigurationChanged() override;
  56
  57   // Overriden from ShellObserver:
  58   void OnAppTerminating() override;
  59
  60   // Exposed for testing.
  61   ASH_EXPORT static float FindDeviceScaleFactor(float dpi);
  62
  63  private:
  64   DISALLOW_COPY_AND_ASSIGN(DisplayChangeObserver);
  65 };
  66
  67 }  // namespace ash
  68
  69 #endif  // ASH_DISPLAY_DISPLAY_CHANGE_OBSERVER_CHROMEOS_H_