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 /* -*- Mode: C++; 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"

 interface nsIDOMElement;

 [scriptable, uuid(56E2ADA8-4631-11d4-BA11-001083023C1E)]

 interface nsIScrollBoxObject : nsISupports

 {

   /**

    * Scroll to the given coordinates, in css pixels.

    * (0,0) will put the top left corner of the scrolled element's padding-box

    * at the top left corner of the scrollport (which is its inner-border-box).

    * Values will be clamped to legal values.

    */

   void scrollTo(in long x, in long y);

   /**

    * Scroll the given amount of device pixels to the right and down.

    * Values will be clamped to make the resuling position legal.

    */

   void scrollBy(in long dx, in long dy);

   void scrollByLine(in long dlines);

   void scrollByIndex(in long dindexes);

   void scrollToLine(in long line);

   void scrollToElement(in nsIDOMElement child);

   void scrollToIndex(in long index);

   /**

    * Get the current scroll position in css pixels.

    * @see scrollTo for the definition of x and y.

    */

   void getPosition(out long x, out long y);

   void getScrolledSize(out long width, out long height);

   void ensureElementIsVisible(in nsIDOMElement child);

   void ensureIndexIsVisible(in long index);

   void ensureLineIsVisible(in long line);

 };

 %{C++

 class nsIBoxObject;

 nsresult

 NS_NewScrollBoxObject(nsIBoxObject** aResult);

 %}