1 files changed, 36 insertions, 0 deletions
diff --git a/widget/nsIScreenManager.idl b/widget/nsIScreenManager.idl
new file mode 100644
index 0000000000..9203d7891f
--- /dev/null
+++ b/widget/nsIScreenManager.idl
@@ -0,0 +1,36 @@
+/* -*- 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"
+
+%{C++
+#include "nsCOMPtr.h"
+%}
+
+[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) ;
+
+%{C++
+  already_AddRefed<nsIScreen> ScreenForRect(const mozilla::DesktopIntRect& aRect) {
+    nsCOMPtr<nsIScreen> screen;
+    ScreenForRect(aRect.x, aRect.y, aRect.width, aRect.height, getter_AddRefs(screen));
+    return screen.forget();
+  }
+%}
+
+  // The screen with the menubar/taskbar. This shouldn't be needed very often.
+  readonly attribute nsIScreen primaryScreen;
+
+  // The total number of pixels across all monitors.
+  readonly attribute int64_t totalScreenPixels;
+};