/* -*- 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"
#include "domstubs.idl"

interface nsIHTMLObjectResizeListener;

[scriptable, uuid(8b396020-69d3-451f-80c1-1a96a7da25a9)]

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
   * @param aMouseEvent [IN] the event
   */
  void mouseDown(in long aX, in long aY,
                 in nsIDOMElement aTarget, in nsIDOMEvent aMouseEvent);

  /**
   * 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);
};