ash/display/screen_ash.h

   1 // Copyright 2014 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_SCREEN_ASH_H_
   6 #define ASH_DISPLAY_SCREEN_ASH_H_
   7
   8 #include "ash/ash_export.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/observer_list.h"
  11 #include "ui/gfx/display_observer.h"
  12 #include "ui/gfx/screen.h"
  13
  14 namespace gfx {
  15 class Rect;
  16 }
  17
  18 namespace ash {
  19 namespace  internal {
  20 class DisplayManager;
  21 }
  22
  23 // Aura implementation of gfx::Screen. Implemented here to avoid circular
  24 // dependencies.
  25 class ASH_EXPORT ScreenAsh : public gfx::Screen {
  26  public:
  27   ScreenAsh();
  28   ~ScreenAsh() override;
  29
  30   // gfx::Screen overrides:
  31   gfx::Point GetCursorScreenPoint() override;
  32   gfx::NativeWindow GetWindowUnderCursor() override;
  33   gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override;
  34   int GetNumDisplays() const override;
  35   std::vector<gfx::Display> GetAllDisplays() const override;
  36   gfx::Display GetDisplayNearestWindow(gfx::NativeView view) const override;
  37   gfx::Display GetDisplayNearestPoint(const gfx::Point& point) const override;
  38   gfx::Display GetDisplayMatching(const gfx::Rect& match_rect) const override;
  39   gfx::Display GetPrimaryDisplay() const override;
  40   void AddObserver(gfx::DisplayObserver* observer) override;
  41   void RemoveObserver(gfx::DisplayObserver* observer) override;
  42
  43  private:
  44   friend class DisplayManager;
  45
  46   // Notifies observers of display configuration changes.
  47   void NotifyMetricsChanged(const gfx::Display& display, uint32_t metrics);
  48   void NotifyDisplayAdded(const gfx::Display& display);
  49   void NotifyDisplayRemoved(const gfx::Display& display);
  50
  51   // Creates a screen that can be used during shutdown.
  52   // It simply has a copy of the displays.
  53   gfx::Screen* CloneForShutdown();
  54
  55   ObserverList<gfx::DisplayObserver> observers_;
  56
  57   DISALLOW_COPY_AND_ASSIGN(ScreenAsh);
  58 };
  59
  60 }  // namespace ash
  61
  62 #endif  // ASH_DISPLAY_SCREEN_ASH_H_