/*
 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
 * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
 *
 * $LastChangedDate: 2007-03-27 16:29:43 -0500 (Tue, 27 Mar 2007) $
 * $Rev: 1601 $
 */

(function ($) {
  $.fn._height = $.fn.height;
  $.fn._width  = $.fn.width;

  /**
   * If used on document, returns the document's height (innerHeight)
   * If used on window, returns the viewport's (window) height
   * See core docs on height() to see what happens when used on an element.
   *
   * @example $("#testdiv").height()
   * @result 200
   *
   * @example $(document).height()
   * @result 800
   *
   * @example $(window).height()
   * @result 400
   *
   * @name height
   * @type Object
   * @cat Plugins/Dimensions
   */
  $.fn.height = function() {
    if ( this[0] == window )
      return self.innerHeight ||
        $.boxModel && document.documentElement.clientHeight ||
        document.body.clientHeight;

    if ( this[0] == document )
      return Math.max( document.body.scrollHeight, document.body.offsetHeight );

    return this._height(arguments[0]);
  };

  /**
   * If used on document, returns the document's width (innerWidth)
   * If used on window, returns the viewport's (window) width
   * See core docs on height() to see what happens when used on an element.
   *
   * @example $("#testdiv").width()
   * @result 200
   *
   * @example $(document).width()
   * @result 800
   *
   * @example $(window).width()
   * @result 400
   *
   * @name width
   * @type Object
   * @cat Plugins/Dimensions
   */
  $.fn.width = function() {
    if ( this[0] == window )
      return self.innerWidth ||
        $.boxModel && document.documentElement.clientWidth ||
        document.body.clientWidth;

    if ( this[0] == document )
      return Math.max( document.body.scrollWidth, document.body.offsetWidth );

    return this._width(arguments[0]);
  };

  /**
   * Returns the inner height value (without border) for the first matched element.
   * If used on document, returns the document's height (innerHeight)
   * If used on window, returns the viewport's (window) height
   *
   * @example $("#testdiv").innerHeight()
   * @result 800
   *
   * @name innerHeight
   * @type Number
   * @cat Plugins/Dimensions
   */
  $.fn.innerHeight = function() {
    return this[0] == window || this[0] == document ?
      this.height() :
      this.css('display') != 'none' ?
        this[0].offsetHeight - (parseInt(this.css("borderTopWidth")) || 0) - (parseInt(this.css("borderBottomWidth")) || 0) :
        this.height() + (parseInt(this.css("paddingTop")) || 0) + (parseInt(this.css("paddingBottom")) || 0);
  };

  /**
   * Returns the inner width value (without border) for the first matched element.
   * If used on document, returns the document's Width (innerWidth)
   * If used on window, returns the viewport's (window) width
   *
   * @example $("#testdiv").innerWidth()
   * @result 1000
   *
   * @name innerWidth
   * @type Number
   * @cat Plugins/Dimensions
   */
  $.fn.innerWidth = function() {
    return this[0] == window || this[0] == document ?
      this.width() :
      this.css('display') != 'none' ?
        this[0].offsetWidth - (parseInt(this.css("borderLeftWidth")) || 0) - (parseInt(this.css("borderRightWidth")) || 0) :
        this.height() + (parseInt(this.css("paddingLeft")) || 0) + (parseInt(this.css("paddingRight")) || 0);
  };

  /**
   * Returns the outer height value (including border) for the first matched element.
   * Cannot be used on document or window.
   *
   * @example $("#testdiv").outerHeight()
   * @result 1000
   *
   * @name outerHeight
   * @type Number
   * @cat Plugins/Dimensions
   */
  $.fn.outerHeight = function() {
    return this[0] == window || this[0] == document ?
      this.height() :
      this.css('display') != 'none' ?
        this[0].offsetHeight :
        this.height() + (parseInt(this.css("borderTopWidth")) || 0) + (parseInt(this.css("borderBottomWidth")) || 0)
          + (parseInt(this.css("paddingTop")) || 0) + (parseInt(this.css("paddingBottom")) || 0);
  };

  /**
   * Returns the outer width value (including border) for the first matched element.
   * Cannot be used on document or window.
   *
   * @example $("#testdiv").outerWidth()
   * @result 1000
   *
   * @name outerWidth
   * @type Number
   * @cat Plugins/Dimensions
   */
  $.fn.outerWidth = function() {
    return this[0] == window || this[0] == document ?
      this.width() :
      this.css('display') != 'none' ?
        this[0].offsetWidth :
        this.height() + (parseInt(this.css("borderLeftWidth")) || 0) + (parseInt(this.css("borderRightWidth")) || 0)
          + (parseInt(this.css("paddingLeft")) || 0) + (parseInt(this.css("paddingRight")) || 0);
  };

  /**
   * Returns how many pixels the user has scrolled to the right (scrollLeft).
   * Works on containers with overflow: auto and window/document.
   *
   * @example $("#testdiv").scrollLeft()
   * @result 100
   *
   * @name scrollLeft
   * @type Number
   * @cat Plugins/Dimensions
   */
  $.fn.scrollLeft = function() {
    if ( this[0] == window || this[0] == document )
      return self.pageXOffset ||
        $.boxModel && document.documentElement.scrollLeft ||
        document.body.scrollLeft;

    return this[0].scrollLeft;
  };

  /**
   * Returns how many pixels the user has scrolled to the bottom (scrollTop).
   * Works on containers with overflow: auto and window/document.
   *
   * @example $("#testdiv").scrollTop()
   * @result 100
   *
   * @name scrollTop
   * @type Number
   * @cat Plugins/Dimensions
   */
  $.fn.scrollTop = function() {
    if ( this[0] == window || this[0] == document )
      return self.pageYOffset ||
        $.boxModel && document.documentElement.scrollTop ||
        document.body.scrollTop;

    return this[0].scrollTop;
  };

  /**
   * Returns the location of the element in pixels from the top left corner of the viewport.
   *
   * For accurate readings make sure to use pixel values for margins, borders and padding.
   *
   * @example $("#testdiv").offset()
   * @result { top: 100, left: 100, scrollTop: 10, scrollLeft: 10 }
   *
   * @example $("#testdiv").offset({ scroll: false })
   * @result { top: 90, left: 90 }
   *
   * @example var offset = {}
   * $("#testdiv").offset({ scroll: false }, offset)
   * @result offset = { top: 90, left: 90 }
   *
   * @name offset
   * @param Object options A hash of options describing what should be included in the final calculations of the offset.
   *                       The options include:
   *                           margin: Should the margin of the element be included in the calculations? True by default.
   *                                   If set to false the margin of the element is subtracted from the total offset.
   *                           border: Should the border of the element be included in the calculations? True by default.
   *                                   If set to false the border of the element is subtracted from the total offset.
   *                           padding: Should the padding of the element be included in the calculations? False by default.
   *                                    If set to true the padding of the element is added to the total offset.
   *                           scroll: Should the scroll offsets of the parent elements be included in the calculations?
   *                                   True by default. When true, it adds the total scroll offsets of all parents to the
   *                                   total offset and also adds two properties to the returned object, scrollTop and
   *                                   scrollLeft. If set to false the scroll offsets of parent elements are ignored.
   *                                   If scroll offsets are not needed, set to false to get a performance boost.
   * @param Object returnObject An object to store the return value in, so as not to break the chain. If passed in the
   *                            chain will not be broken and the result will be assigned to this object.
   * @type Object
   * @cat Plugins/Dimensions
   * @author Brandon Aaron (brandon.aaron@gmail.com || http://brandonaaron.net)
   */
  $.fn.offset = function(options, returnObject) {
    var x = 0, y = 0, elem = this[0], parent = this[0], absparent=false, relparent=false, op, sl = 0, st = 0, options = $.extend({ margin: true, border: true, padding: false, scroll: true }, options || {});
    do {
      x += parent.offsetLeft || 0;
      y += parent.offsetTop  || 0;

      // Mozilla and IE do not add the border
      if ($.browser.mozilla || $.browser.msie) {
        // get borders
        var bt = parseInt($.css(parent, 'borderTopWidth')) || 0;
        var bl = parseInt($.css(parent, 'borderLeftWidth')) || 0;

        // add borders to offset
        x += bl;
        y += bt;

        // Mozilla removes the border if the parent has overflow property other than visible
        if ($.browser.mozilla && parent != elem && $.css(parent, 'overflow') != 'visible') {
          x += bl;
          y += bt;
        }

        // Mozilla does not include the border on body if an element isn't positioned absolute and is without an absolute parent
        if ($.css(parent, 'position') == 'absolute') absparent = true;
        // IE does not include the border on the body if an element is position static and without an absolute or relative parent
        if ($.css(parent, 'position') == 'relative') relparent = true;
      }

      if (options.scroll) {
        // Need to get scroll offsets in-between offsetParents
        op = parent.offsetParent;
        do {
          sl += parent.scrollLeft || 0;
          st += parent.scrollTop  || 0;

          parent = parent.parentNode;

          // Mozilla removes the border if the parent has overflow property other than visible
          if ($.browser.mozilla && parent != elem && parent != op && $.css(parent, 'overflow') != 'visible') {
            x += parseInt($.css(parent, 'borderLeftWidth')) || 0;
            y += parseInt($.css(parent, 'borderTopWidth')) || 0;
          }
        } while (op && parent != op);
      } else
        parent = parent.offsetParent;

      if (parent && (parent.tagName.toLowerCase() == 'body' || parent.tagName.toLowerCase() == 'html')) {
        // Safari and IE Standards Mode doesn't add the body margin for elments positioned with static or relative
        if (($.browser.safari || ($.browser.msie && $.boxModel)) && $.css(elem, 'position') != 'absolute') {
          x += parseInt($.css(parent, 'marginLeft')) || 0;
          y += parseInt($.css(parent, 'marginTop'))  || 0;
        }
        // Mozilla does not include the border on body if an element isn't positioned absolute and is without an absolute parent
        // IE does not include the border on the body if an element is positioned static and without an absolute or relative parent
        if ( ($.browser.mozilla && !absparent) ||
             ($.browser.msie && $.css(elem, 'position') == 'static' && (!relparent || !absparent)) ) {
          x += parseInt($.css(parent, 'borderLeftWidth')) || 0;
          y += parseInt($.css(parent, 'borderTopWidth'))  || 0;
        }
        break; // Exit the loop
      }
    } while (parent);

    if ( !options.margin) {
      x -= parseInt($.css(elem, 'marginLeft')) || 0;
      y -= parseInt($.css(elem, 'marginTop'))  || 0;
    }

    // Safari and Opera do not add the border for the element
    if ( options.border && ($.browser.safari || $.browser.opera) ) {
      x += parseInt($.css(elem, 'borderLeftWidth')) || 0;
      y += parseInt($.css(elem, 'borderTopWidth'))  || 0;
    } else if ( !options.border && !($.browser.safari || $.browser.opera) ) {
      x -= parseInt($.css(elem, 'borderLeftWidth')) || 0;
      y -= parseInt($.css(elem, 'borderTopWidth'))  || 0;
    }

    if ( options.padding ) {
      x += parseInt($.css(elem, 'paddingLeft')) || 0;
      y += parseInt($.css(elem, 'paddingTop'))  || 0;
    }

    // Opera thinks offset is scroll offset for display: inline elements
    if (options.scroll && $.browser.opera && $.css(elem, 'display') == 'inline') {
      sl -= elem.scrollLeft || 0;
      st -= elem.scrollTop  || 0;
    }

    var returnValue = options.scroll ? { top: y - st, left: x - sl, scrollTop:  st, scrollLeft: sl }
                                     : { top: y, left: x };

    if (returnObject) { $.extend(returnObject, returnValue); return this; }
    else              { return returnValue; }
  };
})(jQuery);