Move Screen, its impls, DisplayObserver and DisplayChangeNotifier to ui/display

ui/gfx/screen.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef UI_GFX_SCREEN_H_
-#define UI_GFX_SCREEN_H_
-
-#include <vector>
-
-#include "base/macros.h"
-#include "ui/gfx/display.h"
-#include "ui/gfx/gfx_export.h"
-#include "ui/gfx/native_widget_types.h"
-
-namespace gfx {
-
-class DisplayObserver;
-class Point;
-class Rect;
-
-// A utility class for getting various info about screen size, displays,
-// cursor position, etc.
-//
-// Note that this class does not represent an individual display connected to a
-// computer -- see the Display class for that. A single Screen object exists
-// regardless of the number of connected displays.
-class GFX_EXPORT Screen {
- public:
-  Screen();
-  virtual ~Screen();
-
-  // Retrieves the single Screen object.
-  static Screen* GetScreen();
-
-  // Sets the global screen. NOTE: this does not take ownership of |screen|.
-  // Tests must be sure to reset any state they install.
-  static void SetScreenInstance(Screen* instance);
-
-  // Returns the current absolute position of the mouse pointer.
-  virtual gfx::Point GetCursorScreenPoint() = 0;
-
-  // Returns true if the cursor is directly over |window|.
-  virtual bool IsWindowUnderCursor(gfx::NativeWindow window) = 0;
-
-  // Returns the window at the given screen coordinate |point|.
-  virtual gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) = 0;
-
-  // Returns the number of displays.
-  // Mirrored displays are excluded; this method is intended to return the
-  // number of distinct, usable displays.
-  virtual int GetNumDisplays() const = 0;
-
-  // Returns the list of displays that are currently available.
-  virtual std::vector<gfx::Display> GetAllDisplays() const = 0;
-
-  // Returns the display nearest the specified window.
-  // If the window is NULL or the window is not rooted to a display this will
-  // return the primary display.
-  virtual gfx::Display GetDisplayNearestWindow(NativeView view) const = 0;
-
-  // Returns the display nearest the specified point. |point| should be in DIPs.
-  virtual gfx::Display GetDisplayNearestPoint(
-      const gfx::Point& point) const = 0;
-
-  // Returns the display that most closely intersects the provided bounds.
-  virtual gfx::Display GetDisplayMatching(
-      const gfx::Rect& match_rect) const = 0;
-
-  // Returns the primary display.
-  virtual gfx::Display GetPrimaryDisplay() const = 0;
-
-  // Adds/Removes display observers.
-  virtual void AddObserver(DisplayObserver* observer) = 0;
-  virtual void RemoveObserver(DisplayObserver* observer) = 0;
-
-  // Converts |screen_rect| to DIP coordinates in the context of |view| clamping
-  // to the enclosing rect if the coordinates do not fall on pixel boundaries.
-  // If |view| is null, the primary display is used as the context.
-  virtual gfx::Rect ScreenToDIPRectInWindow(NativeView view,
-                                            const gfx::Rect& screen_rect) const;
-
-  // Converts |dip_rect| to screen coordinates in the context of |view| clamping
-  // to the enclosing rect if the coordinates do not fall on pixel boundaries.
-  // If |view| is null, the primary display is used as the context.
-  virtual gfx::Rect DIPToScreenRectInWindow(NativeView view,
-                                            const gfx::Rect& dip_rect) const;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(Screen);
-};
-
-Screen* CreateNativeScreen();
-
-}  // namespace gfx
-
-#endif  // UI_GFX_SCREEN_H_