/* -*- 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 "nsIDOMNode.idl"

interface nsIDOMMozNamedAttrMap;

/**
 * The nsIDOMElement interface represents an element in an HTML or 
 * XML document. 
 *
 * For more information on this interface please see 
 * http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#interface-element
 */

[scriptable, uuid(989422ef-120d-4d29-8a56-6aa2505a8b02)]
interface nsIDOMElement : nsIDOMNode
{
  readonly attribute DOMString        tagName;

  /**
   * Returns a DOMTokenList object reflecting the class attribute.
   */
  readonly attribute nsISupports classList;

  readonly attribute nsIDOMMozNamedAttrMap attributes;
  DOMString          getAttribute(in DOMString name);
  DOMString          getAttributeNS(in DOMString namespaceURI, 
                                    in DOMString localName);
  void               setAttribute(in DOMString name, 
                                  in DOMString value);
  void               setAttributeNS(in DOMString namespaceURI, 
                                    in DOMString qualifiedName, 
                                    in DOMString value);
  void               removeAttribute(in DOMString name);
  void               removeAttributeNS(in DOMString namespaceURI, 
                                       in DOMString localName);
  boolean            hasAttribute(in DOMString name);
  boolean            hasAttributeNS(in DOMString namespaceURI, 
                                    in DOMString localName);

  // Obsolete methods.
  nsIDOMAttr         getAttributeNode(in DOMString name);
  nsIDOMAttr         setAttributeNode(in nsIDOMAttr newAttr);
  nsIDOMAttr         removeAttributeNode(in nsIDOMAttr oldAttr);
  nsIDOMAttr         getAttributeNodeNS(in DOMString namespaceURI, 
                                        in DOMString localName);
  nsIDOMAttr         setAttributeNodeNS(in nsIDOMAttr newAttr)
                                        raises(DOMException);

  nsIDOMHTMLCollection getElementsByTagName(in DOMString name);
  nsIDOMHTMLCollection getElementsByTagNameNS(in DOMString namespaceURI, 
                                              in DOMString localName);
  /**
   * Retrieve elements matching all classes listed in a
   * space-separated string.
   */
  nsIDOMHTMLCollection getElementsByClassName(in DOMString classes);

  /**
   * Returns a live nsIDOMNodeList of the current child elements.
   */
  [binaryname(ChildElements)]
  readonly attribute nsIDOMNodeList children;
  /**
   * Similar as the attributes on nsIDOMNode, but navigates just elements
   * rather than all nodes.
   */
  readonly attribute nsIDOMElement firstElementChild;
  readonly attribute nsIDOMElement lastElementChild;
  readonly attribute nsIDOMElement previousElementSibling;
  readonly attribute nsIDOMElement nextElementSibling;
  /**
   * Returns the number of child nodes that are nsIDOMElements.
   */
  readonly attribute unsigned long childElementCount;

  [binaryname(MozRemove)]
  void remove();

  // CSSOM View
  /**
   * Retrieve a list of rectangles, one for each CSS border-box associated with
   * the element. The coordinates are in CSS pixels, and relative to
   * the top-left of the document's viewport, unless the document
   * has an SVG foreignobject ancestor, in which case the coordinates are
   * relative to the top-left of the content box of the nearest SVG foreignobject
   * ancestor. The coordinates are calculated as if every scrollable element
   * is scrolled to its default position.
   *
   * Note: the boxes of overflowing children do not affect these rectangles.
   * Note: some elements have empty CSS boxes. Those return empty rectangles,
   * but the coordinates may still be meaningful.
   * Note: some elements have no CSS boxes (including display:none elements,
   * HTML AREA elements, and SVG elements that do not render). Those return
   * an empty list.
   */
  nsIDOMClientRectList getClientRects();

  /**
   * Returns the union of all rectangles in the getClientRects() list. Empty
   * rectangles are ignored, except that if all rectangles are empty,
   * we return an empty rectangle positioned at the top-left of the first
   * rectangle in getClientRects().
   */
  nsIDOMClientRect getBoundingClientRect();

  /**
   * The vertical scroll position of the element, or 0 if the element is not
   * scrollable. This property may be assigned a value to change the
   * vertical scroll position.
   */
  attribute long             scrollTop;

  /**
   * The horizontal scroll position of the element, or 0 if the element is not
   * scrollable. This property may be assigned a value to change the
   * horizontal scroll position.
   */
  attribute long             scrollLeft;

  /**
   * The width of the scrollable area of the element. If the element is not
   * scrollable, scrollWidth is equivalent to the offsetWidth.
   */
  readonly attribute long             scrollWidth;

  /**
   * The height of the scrollable area of the element. If the element is not
   * scrollable, scrollHeight is equivalent to the offsetHeight.
   */
  readonly attribute long             scrollHeight;

  /**
   * The height in CSS pixels of the element's top border.
   */
  readonly attribute long             clientTop;

  /**
   * The width in CSS pixels of the element's left border and scrollbar
   * if it is present on the left side.
   */
  readonly attribute long             clientLeft;

  /**
   * The height in CSS pixels of the element's padding box. If the element is
   * scrollable, the scroll bars are included inside this width.
   */
  readonly attribute long             clientWidth;

  /**
   * The width in CSS pixels of the element's padding box. If the element is
   * scrollable, the scroll bars are included inside this height.
   */
  readonly attribute long             clientHeight;

  /* The maximum offset that the element can be scrolled to
     (i.e., the value that scrollLeft/scrollTop would be clamped to if they were
     set to arbitrarily large values. */
  readonly attribute long             scrollLeftMax;
  readonly attribute long             scrollTopMax;


  // Selectors API
  /**
   * Returns whether this element would be selected by the given selector
   * string.
   *
   * See <http://dev.w3.org/2006/webapi/selectors-api2/#matchesselector>
   */
  boolean mozMatchesSelector([Null(Stringify)] in DOMString selector);


  // Proprietary extensions
  /**
   * Set this during a mousedown event to grab and retarget all mouse events
   * to this element until the mouse button is released or releaseCapture is
   * called. If retargetToElement is true, then all events are targetted at
   * this element. If false, events can also fire at descendants of this
   * element.
   * 
   */
  void setCapture([optional] in boolean retargetToElement);

  /**
   * If this element has captured the mouse, release the capture. If another
   * element has captured the mouse, this method has no effect.
   */
  void releaseCapture();

  // Mozilla extensions
  /**
   * Requests that this element be made the full-screen element, as per the DOM
   * full-screen api.
   *
   * @see <https://wiki.mozilla.org/index.php?title=Gecko:FullScreenAPI>
   */
  void mozRequestFullScreen();

  /**
   * Requests that this element be made the pointer-locked element, as per the DOM
   * pointer lock api.
   *
   * @see <http://dvcs.w3.org/hg/pointerlock/raw-file/default/index.html>
   */
  void mozRequestPointerLock();

  /**
   * Return nodes that match a given CSS selector.
   *
   * @see <http://dev.w3.org/2006/webapi/selectors-api/>
   */
  nsIDOMElement querySelector([Null(Stringify)] in DOMString selectors);
  nsIDOMNodeList querySelectorAll([Null(Stringify)] in DOMString selectors);
};
