/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is the Mozilla browser.
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications, Inc.  Portions created by Netscape are
 * Copyright (C) 1999, Mozilla.  All Rights Reserved.
 * 
 * Contributor(s):
 *   Chris Saari <saari@netscape.com>
 */

interface nsIDOMWindow;
interface nsIDOMElement;

#include "nsISupports.idl"

/**
 * nsIWebBrowserFocus
 * Interface that embedders use for controlling and interacting
 * with the browser focus management. The embedded browser can be focused by
 * clicking in it or tabbing into it. If the browser is currently focused and
 * the embedding application's top level window is disabled, deactivate() must
 * be called, and activate() called again when the top level window is
 * reactivated for the browser's focus memory to work correctly.
 *
 * @status FROZEN
 */

[scriptable, uuid(9c5d3c58-1dd1-11b2-a1c9-f3699284657a)]
interface nsIWebBrowserFocus : nsISupports
{
  /**
   * MANDATORY
   * activate() is a mandatory call that must be made to the browser
   * when the embedding application's window is activated *and* the 
   * browser area was the last thing in focus.  This method can also be called
   * if the embedding application wishes to give the browser area focus,
   * without affecting the currently focused element within the browser.
   *
   * @note
   * If you fail to make this call, mozilla focus memory will not work
   * correctly.
   */
  void activate();

  /**
   * MANDATORY
   * deactivate() is a mandatory call that must be made to the browser
   * when the embedding application's window is deactivated *and* the
   * browser area was the last thing in focus.  On non-windows platforms,
   * deactivate() should also be called when focus moves from the browser
   * to the embedding chrome.
   *
   * @note
   * If you fail to make this call, mozilla focus memory will not work
   * correctly.
   */
  void deactivate();

  /**
   * Give the first element focus within mozilla
   * (i.e. TAB was pressed and focus should enter mozilla)
   */
  void setFocusAtFirstElement();

  /**
   * Give the last element focus within mozilla
   * (i.e. SHIFT-TAB was pressed and focus should enter mozilla)
   */
  void setFocusAtLastElement();
  
  /**
   * The currently focused nsDOMWindow when the browser is active,
   * or the last focused nsDOMWindow when the browser is inactive.
   */
  attribute nsIDOMWindow focusedWindow;
  
  /**
   * The currently focused nsDOMElement when the browser is active,
   * or the last focused nsDOMElement when the browser is inactive.
   */
  attribute nsIDOMElement focusedElement;
};