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

ui/display/screen.h

-// Copyright 2016 The Chromium Authors. All rights reserved.
+// 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_DISPLAY_SCREEN_H_
 #define UI_DISPLAY_SCREEN_H_
 
-#include "ui/gfx/screen.h"
+#include <vector>
+
+#include "base/macros.h"
+#include "ui/display/display.h"
+#include "ui/display/display_export.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace gfx {
+class Display;
+class Point;
+class Rect;
+}
 
 namespace display {
+using Display = gfx::Display;
+class DisplayObserver;
 
-// TODO(oshima): move the gfx::Screen to display::Screen.
-using Display = gfx::Display;
-using DisplayObserver = gfx::DisplayObserver;
-using Screen = gfx::Screen;
+// 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 DISPLAY_EXPORT Screen {
+ public:
+  Screen();
+  virtual ~Screen();
 
-}  // display
+  // 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<display::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 display::Display GetDisplayNearestWindow(
+      gfx::NativeView view) const = 0;
+
+  // Returns the display nearest the specified point. |point| should be in DIPs.
+  virtual display::Display GetDisplayNearestPoint(
+      const gfx::Point& point) const = 0;
+
+  // Returns the display that most closely intersects the provided bounds.
+  virtual display::Display GetDisplayMatching(
+      const gfx::Rect& match_rect) const = 0;
+
+  // Returns the primary display.
+  virtual display::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(gfx::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(gfx::NativeView view,
+                                            const gfx::Rect& dip_rect) const;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(Screen);
+};
+
+Screen* CreateNativeScreen();
+
+}  // namespace display
 
 #endif  // UI_DISPLAY_SCREEN_H_