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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 "base/basictypes.h"
#include "ui/base/ui_export.h"
#include "ui/gfx/display.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/gfx/point.h"
#include "ui/gfx/screen_type_delegate.h"
namespace gfx {
class DisplayObserver;
class Rect;
// A utility class for getting various info about screen size, displays,
// cursor position, etc.
class UI_EXPORT Screen {
public:
// Retrieves the Screen that the specified NativeView belongs to. A value of
// NULL is treated as |SCREEN_TYPE_NATIVE|.
static Screen* GetScreenFor(NativeView view);
// Returns the SCREEN_TYPE_NATIVE Screen. This should be used with caution,
// as it is likely to be incorrect for code that runs on Windows.
static Screen* GetNativeScreen();
// Sets the global screen for a particular screen type. Only the _NATIVE
// ScreenType must be provided.
static void SetScreenInstance(ScreenType type, Screen* instance);
// Returns the global screen for a particular type. Types other than _NATIVE
// may be NULL.
static Screen* GetScreenByType(ScreenType type);
// Sets the global ScreenTypeDelegate. May be left unset if the platform
// uses only the _NATIVE ScreenType.
static void SetScreenTypeDelegate(ScreenTypeDelegate* delegate);
Screen();
virtual ~Screen();
// Returns true if DIP is enabled.
virtual bool IsDIPEnabled() = 0;
// Returns the current absolute position of the mouse pointer.
virtual gfx::Point GetCursorScreenPoint() = 0;
// Returns the window under the cursor.
virtual gfx::NativeWindow GetWindowAtCursorScreenPoint() = 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() = 0;
// Returns the display nearest the specified window.
virtual gfx::Display GetDisplayNearestWindow(NativeView view) const = 0;
// Returns the the display nearest the specified point.
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;
private:
DISALLOW_COPY_AND_ASSIGN(Screen);
};
Screen* CreateNativeScreen();
} // namespace gfx
#endif // UI_GFX_SCREEN_H_
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