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// 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 the window under the cursor.
virtual gfx::NativeWindow GetWindowUnderCursor() = 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_
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