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/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsISupports.idl"
#include "nsIScreen.idl"
[scriptable, uuid(e8a96e60-6b61-4a14-bacc-53891604b502)]
interface nsIScreenManager : nsISupports
{
//
// Returns the screen that contains the rectangle. If the rect overlaps
// multiple screens, it picks the screen with the greatest area of intersection.
//
// The coordinates are in pixels (not twips) and in screen coordinates.
//
nsIScreen screenForRect ( in long left, in long top, in long width, in long height ) ;
//
// Returns the screen corresponding to the id. If no such screen exists,
// this will throw NS_ERROR_FAILURE. The id is a unique numeric value
// assigned to each screen, and is an attribute available on the nsIScreen
// interface.
nsIScreen screenForId ( in unsigned long id ) ;
// The screen with the menubar/taskbar. This shouldn't be needed very
// often.
readonly attribute nsIScreen primaryScreen;
// Holds the number of screens that are available
readonly attribute unsigned long numberOfScreens;
// The default DPI scaling factor of the screen environment (number of
// screen pixels corresponding to 1 CSS px, at the default zoom level).
//
// This is currently fixed at 1.0 on most platforms, but varies on Windows
// if the "logical DPI" scaling option in the Display control panel is set
// to a value other than 100% (e.g. 125% or 150% are increasingly common
// defaults on laptops with high-dpi screens). See bug 851520.
//
// NOTE that on OS X, this does -not- reflect the "backing scale factor"
// used to support Retina displays, which is a per-display property,
// not a system-wide scaling factor. The default ratio of CSS pixels to
// Cocoa points remains 1:1, even on a Retina screen where one Cocoa point
// corresponds to two device pixels. (This is exposed via other APIs:
// see window.devicePixelRatio).
//
// NOTE also that on Linux, this does -not- currently reflect changes
// to the system-wide (X11 or Gtk2) DPI value, as Firefox does not yet
// honor these settings. See bug 798362 and bug 712898.
readonly attribute float systemDefaultScale;
// Returns the nsIScreen instance for the given native widget pointer;
// the pointer is specific to the particular widget implementation,
// and is generally of the same type that NS_NATIVE_WINDOW is.
[noscript] nsIScreen screenForNativeWidget ( in voidPtr nativeWidget );
};
%{ C++
%}
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