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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * 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 Mozilla.org.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corp.
 * Portions created by the Initial Developer are Copyright (C) 2003
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Daniel Glazman (glazman@netscape.com) (Original author)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"
#include "domstubs.idl"

interface nsIHTMLObjectResizeListener;

[scriptable, uuid(b0338f6c-ded3-4c39-a953-56e8bae494f5)]

interface nsIHTMLObjectResizer : nsISupports
{
%{C++
  typedef short EResizerLocation;
%}
  const short eTopLeft = 0;
  const short eTop = 1;
  const short eTopRight = 2;
  const short eLeft = 3;
  const short eRight = 4;
  const short eBottomLeft = 5;
  const short eBottom = 6;
  const short eBottomRight = 7;

  /**
   * the element currently displaying resizers
   */
  readonly attribute nsIDOMElement resizedObject;

  /**
   * a boolean indicating if object resizing is enabled in the editor
   */
  attribute boolean objectResizingEnabled;

  /**
   * Shows active resizers around an element's frame
   * @param aResizedElement [IN] a DOM Element
   */
  void showResizers(in nsIDOMElement aResizedElement);

  /**
   * Hide resizers if they are visible
   */
  void hideResizers();

  /**
   * Refresh visible resizers
   */
  void refreshResizers();

  /**
   * event callback when a mouse button is pressed
   * @param aX      [IN] horizontal position of the pointer
   * @param aY      [IN] vertical position of the pointer
   * @param aTarget [IN] the element triggering the event
   */
  void mouseDown(in long aX, in long aY,
                 in nsIDOMElement aTarget);

  /**
   * event callback when a mouse button is released
   * @param aX      [IN] horizontal position of the pointer
   * @param aY      [IN] vertical position of the pointer
   * @param aTarget [IN] the element triggering the event
   */
  void mouseUp(in long aX, in long aY,
               in nsIDOMElement aTarget);

  /**
   * event callback when the mouse pointer is moved
   * @param aMouseEvent [IN] the event
   */
  void mouseMove(in nsIDOMEvent aMouseEvent);

  /* Event Listeners */

  /**
   * Creates a resize listener that can be used to get notifications
   * that the user started to resize an object or finalized such an operation
   * @param aListener [IN] an instance of nsIHTMLObjectResizeListener
   */
  void addObjectResizeEventListener(in nsIHTMLObjectResizeListener aListener);

  /**
   * Deletes a resize listener
   * @param aListener [IN] an instance of nsIHTMLObjectResizeListener
   */
  void removeObjectResizeEventListener(in nsIHTMLObjectResizeListener aListener);
};