/* Copyright (c) 2007 Paul Bakaus (paul.bakaus@googlemail.com) and Brandon Aaron (brandon.aaron@gmail.com || http://brandonaaron.net)
 * 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: 2007-08-17 13:14:11 -0500 (Fri, 17 Aug 2007) $
 * $Rev: 2759 $
 *
 * Version: 1.1.2
 *
 * Requires: jQuery 1.1.3+
 */

(function($){

// store a copy of the core height and width methods
var height = $.fn.height,
    width  = $.fn.width;

$.fn.extend({
  /**
   * 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 Number
   * @cat Plugins/Dimensions
   */
  height: function() {
    if ( !this[0] ) error();
    if ( this[0] == window )
      if ( $.browser.opera || ($.browser.safari && parseInt($.browser.version) > 520) )
        return self.innerHeight - (($(document).height() > self.innerHeight) ? getScrollbarWidth() : 0);
      else if ( $.browser.safari )
        return self.innerHeight;
      else
                return $.boxModel && document.documentElement.clientHeight || document.body.clientHeight;

    if ( this[0] == document )
      return Math.max( ($.boxModel && document.documentElement.scrollHeight || document.body.scrollHeight), document.body.offsetHeight );

    return height.apply(this, arguments);
  },

  /**
   * If used on document, returns the document's width (innerWidth).
   * If used on window, returns the viewport's (window) width.
   * See core docs on width() 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 Number
   * @cat Plugins/Dimensions
   */
  width: function() {
    if (!this[0]) error();
    if ( this[0] == window )
      if ( $.browser.opera || ($.browser.safari && parseInt($.browser.version) > 520) )
        return self.innerWidth - (($(document).width() > self.innerWidth) ? getScrollbarWidth() : 0);
      else if ( $.browser.safari )
        return self.innerWidth;
      else
                return $.boxModel && document.documentElement.clientWidth || document.body.clientWidth;

    if ( this[0] == document )
      if ($.browser.mozilla) {
        // mozilla reports scrollWidth and offsetWidth as the same
        var scrollLeft = self.pageXOffset;
        self.scrollTo(99999999, self.pageYOffset);
        var scrollWidth = self.pageXOffset;
        self.scrollTo(scrollLeft, self.pageYOffset);
        return document.body.offsetWidth + scrollWidth;
      }
      else
        return Math.max( (($.boxModel && !$.browser.safari) && document.documentElement.scrollWidth || document.body.scrollWidth), document.body.offsetWidth );

    return width.apply(this, arguments);
  },

  /**
   * Gets the inner height (excludes the border and includes the padding) 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 210
   *
   * @name innerHeight
   * @type Number
   * @cat Plugins/Dimensions
   */
  innerHeight: function() {
    if (!this[0]) error();
    return this[0] == window || this[0] == document ?
      this.height() :
      this.is(':visible') ?
        this[0].offsetHeight - num(this, 'borderTopWidth') - num(this, 'borderBottomWidth') :
        this.height() + num(this, 'paddingTop') + num(this, 'paddingBottom');
  },

  /**
   * Gets the inner width (excludes the border and includes the padding) 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 210
   *
   * @name innerWidth
   * @type Number
   * @cat Plugins/Dimensions
   */
  innerWidth: function() {
    if (!this[0]) error();
    return this[0] == window || this[0] == document ?
      this.width() :
      this.is(':visible') ?
        this[0].offsetWidth - num(this, 'borderLeftWidth') - num(this, 'borderRightWidth') :
        this.width() + num(this, 'paddingLeft') + num(this, 'paddingRight');
  },

  /**
   * Gets the outer height (includes the border and padding) 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.
   *
   * The margin can be included in the calculation by passing an options map with margin
   * set to true.
   *
   * @example $("#testdiv").outerHeight()
   * @result 220
   *
   * @example $("#testdiv").outerHeight({ margin: true })
   * @result 240
   *
   * @name outerHeight
   * @type Number
   * @param Map options Optional settings to configure the way the outer height is calculated.
   * @cat Plugins/Dimensions
   */
  outerHeight: function(options) {
    if (!this[0]) error();
    options = $.extend({ margin: false }, options || {});
    return this[0] == window || this[0] == document ?
      this.height() :
      this.is(':visible') ?
        this[0].offsetHeight + (options.margin ? (num(this, 'marginTop') + num(this, 'marginBottom')) : 0) :
        this.height()
          + num(this,'borderTopWidth') + num(this, 'borderBottomWidth')
          + num(this, 'paddingTop') + num(this, 'paddingBottom')
          + (options.margin ? (num(this, 'marginTop') + num(this, 'marginBottom')) : 0);
  },

  /**
   * Gets the outer width (including the border and padding) 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.
   *
   * The margin can be included in the calculation by passing an options map with margin
   * set to true.
   *
   * @example $("#testdiv").outerWidth()
   * @result 1000
   *
   * @example $("#testdiv").outerWidth({ margin: true })
   * @result 1020
   *
   * @name outerHeight
   * @type Number
   * @param Map options Optional settings to configure the way the outer width is calculated.
   * @cat Plugins/Dimensions
   */
  outerWidth: function(options) {
    if (!this[0]) error();
    options = $.extend({ margin: false }, options || {});
    return this[0] == window || this[0] == document ?
      this.width() :
      this.is(':visible') ?
        this[0].offsetWidth + (options.margin ? (num(this, 'marginLeft') + num(this, 'marginRight')) : 0) :
        this.width()
          + num(this, 'borderLeftWidth') + num(this, 'borderRightWidth')
          + num(this, 'paddingLeft') + num(this, 'paddingRight')
          + (options.margin ? (num(this, 'marginLeft') + num(this, 'marginRight')) : 0);
  },

  /**
   * Gets how many pixels the user has scrolled to the right (scrollLeft).
   * Works on containers with overflow: auto and window/document.
   *
   * @example $(window).scrollLeft()
   * @result 100
   *
   * @example $(document).scrollLeft()
   * @result 100
   *
   * @example $("#testdiv").scrollLeft()
   * @result 100
   *
   * @name scrollLeft
   * @type Number
   * @cat Plugins/Dimensions
   */
  /**
   * Sets the scrollLeft property for each element and continues the chain.
   * Works on containers with overflow: auto and window/document.
   *
   * @example $(window).scrollLeft(100).scrollLeft()
   * @result 100
   *
   * @example $(document).scrollLeft(100).scrollLeft()
   * @result 100
   *
   * @example $("#testdiv").scrollLeft(100).scrollLeft()
   * @result 100
   *
   * @name scrollLeft
   * @param Number value A positive number representing the desired scrollLeft.
   * @type jQuery
   * @cat Plugins/Dimensions
   */
  scrollLeft: function(val) {
    if (!this[0]) error();
    if ( val != undefined )
      // set the scroll left
      return this.each(function() {
        if (this == window || this == document)
          window.scrollTo( val, $(window).scrollTop() );
        else
          this.scrollLeft = val;
      });

    // return the scroll left offest in pixels
    if ( this[0] == window || this[0] == document )
      return self.pageXOffset ||
        $.boxModel && document.documentElement.scrollLeft ||
        document.body.scrollLeft;

    return this[0].scrollLeft;
  },

  /**
   * Gets how many pixels the user has scrolled to the bottom (scrollTop).
   * Works on containers with overflow: auto and window/document.
   *
   * @example $(window).scrollTop()
   * @result 100
   *
   * @example $(document).scrollTop()
   * @result 100
   *
   * @example $("#testdiv").scrollTop()
   * @result 100
   *
   * @name scrollTop
   * @type Number
   * @cat Plugins/Dimensions
   */
  /**
   * Sets the scrollTop property for each element and continues the chain.
   * Works on containers with overflow: auto and window/document.
   *
   * @example $(window).scrollTop(100).scrollTop()
   * @result 100
   *
   * @example $(document).scrollTop(100).scrollTop()
   * @result 100
   *
   * @example $("#testdiv").scrollTop(100).scrollTop()
   * @result 100
   *
   * @name scrollTop
   * @param Number value A positive number representing the desired scrollTop.
   * @type jQuery
   * @cat Plugins/Dimensions
   */
  scrollTop: function(val) {
    if (!this[0]) error();
    if ( val != undefined )
      // set the scroll top
      return this.each(function() {
        if (this == window || this == document)
          window.scrollTo( $(window).scrollLeft(), val );
        else
          this.scrollTop = val;
      });

    // return the scroll top offset in pixels
    if ( this[0] == window || this[0] == document )
      return self.pageYOffset ||
        $.boxModel && document.documentElement.scrollTop ||
        document.body.scrollTop;

    return this[0].scrollTop;
  },

  /**
   * Gets the top and left positioned offset in pixels.
   * The positioned offset is the offset between a positioned
   * parent and the element itself.
   *
   * For accurate calculations make sure to use pixel values for margins, borders and padding.
   *
   * @example $("#testdiv").position()
   * @result { top: 100, left: 100 }
   *
   * @example var position = {};
   * $("#testdiv").position(position)
   * @result position = { top: 100, left: 100 }
   *
   * @name position
   * @param Object returnObject Optional 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
   */
  position: function(returnObject) {
    return this.offset({ margin: false, scroll: false, relativeTo: this.offsetParent() }, returnObject);
  },

  /**
   * Gets the location of the element in pixels from the top left corner of the viewport.
   * The offset method takes an optional map of key value pairs to configure the way
   * the offset is calculated. Here are the different options.
   *
   * (Boolean) margin - Should the margin of the element be included in the calculations? True by default.
   * (Boolean) border - Should the border of the element be included in the calculations? False by default.
   * (Boolean) padding - Should the padding of the element be included in the calculations? False by default.
   * (Boolean) 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.
   * (Boolean) lite - When true it will use the offsetLite method instead of the full-blown, slower offset method. False by default.
   *                  Only use this when margins, borders and padding calculations don't matter.
   * (HTML Element) relativeTo - This should be a parent of the element and should have position (like absolute or relative).
   *                             It will retreive the offset relative to this parent element. By default it is the body element.
   *
   * Also an object can be passed as the second paramater to
   * catch the value of the return and continue the chain.
   *
   * For accurate calculations make sure to use pixel values for margins, borders and padding.
   *
   * Known issues:
   *  - Issue: A div positioned relative or static without any content before it and its parent will report an offsetTop of 0 in Safari
   *    Workaround: Place content before the relative div ... and set height and width to 0 and overflow to hidden
   *
   * @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 Map options Optional settings to configure the way the offset is calculated.
   * @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
   */
  offset: function(options, returnObject) {
    if (!this[0]) error();
    var x = 0, y = 0, sl = 0, st = 0,
        elem = this[0], parent = this[0], op, parPos, elemPos = $.css(elem, 'position'),
        mo = $.browser.mozilla, ie = $.browser.msie, oa = $.browser.opera,
        sf = $.browser.safari, sf3 = $.browser.safari && parseInt($.browser.version) > 520,
        absparent = false, relparent = false,
        options = $.extend({ margin: true, border: false, padding: false, scroll: true, lite: false, relativeTo: document.body }, options || {});

    // Use offsetLite if lite option is true
    if (options.lite) return this.offsetLite(options, returnObject);
    // Get the HTMLElement if relativeTo is a jquery collection
    if (options.relativeTo.jquery) options.relativeTo = options.relativeTo[0];

    if (elem.tagName == 'BODY') {
      // Safari 2 is the only one to get offsetLeft and offsetTop properties of the body "correct"
      // Except they all mess up when the body is positioned absolute or relative
      x = elem.offsetLeft;
      y = elem.offsetTop;
      // Mozilla ignores margin and subtracts border from body element
      if (mo) {
        x += num(elem, 'marginLeft') + (num(elem, 'borderLeftWidth')*2);
        y += num(elem, 'marginTop')  + (num(elem, 'borderTopWidth') *2);
      } else
      // Opera ignores margin
      if (oa) {
        x += num(elem, 'marginLeft');
        y += num(elem, 'marginTop');
      } else
      // IE does not add the border in Standards Mode
      if ((ie && jQuery.boxModel)) {
        x += num(elem, 'borderLeftWidth');
        y += num(elem, 'borderTopWidth');
      } else
      // Safari 3 doesn't not include border or margin
      if (sf3) {
        x += num(elem, 'marginLeft') + num(elem, 'borderLeftWidth');
        y += num(elem, 'marginTop')  + num(elem, 'borderTopWidth');
      }
    } else {
      do {
        parPos = $.css(parent, 'position');

        x += parent.offsetLeft;
        y += parent.offsetTop;

        // Mozilla and IE do not add the border
        // Mozilla adds the border for table cells
        if ((mo && !parent.tagName.match(/^t[d|h]$/i)) || ie || sf3) {
          // add borders to offset
          x += num(parent, 'borderLeftWidth');
          y += num(parent, 'borderTopWidth');

          // Mozilla does not include the border on body if an element isn't positioned absolute and is without an absolute parent
          if (mo && parPos == '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 (ie && parPos == 'relative') relparent = true;
        }

        op = parent.offsetParent || document.body;
        if (options.scroll || mo) {
          do {
            if (options.scroll) {
              // get scroll offsets
              sl += parent.scrollLeft;
              st += parent.scrollTop;
            }

            // Opera sometimes incorrectly reports scroll offset for elements with display set to table-row or inline
            if (oa && ($.css(parent, 'display') || '').match(/table-row|inline/)) {
              sl = sl - ((parent.scrollLeft == parent.offsetLeft) ? parent.scrollLeft : 0);
              st = st - ((parent.scrollTop == parent.offsetTop) ? parent.scrollTop : 0);
            }

            // Mozilla does not add the border for a parent that has overflow set to anything but visible
            if (mo && parent != elem && $.css(parent, 'overflow') != 'visible') {
              x += num(parent, 'borderLeftWidth');
              y += num(parent, 'borderTopWidth');
            }

            parent = parent.parentNode;
          } while (parent != op);
        }
        parent = op;

        // exit the loop if we are at the relativeTo option but not if it is the body or html tag
        if (parent == options.relativeTo && !(parent.tagName == 'BODY' || parent.tagName == 'HTML'))  {
          // Mozilla does not add the border for a parent that has overflow set to anything but visible
          if (mo && parent != elem && $.css(parent, 'overflow') != 'visible') {
            x += num(parent, 'borderLeftWidth');
            y += num(parent, 'borderTopWidth');
          }
          // Safari 2 and opera includes border on positioned parents
          if ( ((sf && !sf3) || oa) && parPos != 'static' ) {
            x -= num(op, 'borderLeftWidth');
            y -= num(op, 'borderTopWidth');
          }
          break;
        }
        if (parent.tagName == 'BODY' || parent.tagName == 'HTML') {
          // Safari 2 and IE Standards Mode doesn't add the body margin for elments positioned with static or relative
          if (((sf && !sf3) || (ie && $.boxModel)) && elemPos != 'absolute' && elemPos != 'fixed') {
            x += num(parent, 'marginLeft');
            y += num(parent, 'marginTop');
          }
          // Safari 3 does not include the border on body
          // 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 ( sf3 || (mo && !absparent && elemPos != 'fixed') ||
               (ie && elemPos == 'static' && !relparent) ) {
            x += num(parent, 'borderLeftWidth');
            y += num(parent, 'borderTopWidth');
          }
          break; // Exit the loop
        }
      } while (parent);
    }

    var returnValue = handleOffsetReturn(elem, options, x, y, sl, st);

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

  /**
   * Gets the location of the element in pixels from the top left corner of the viewport.
   * This method is much faster than offset but not as accurate when borders and margins are
   * on the element and/or its parents. This method can be invoked
   * by setting the lite option to true in the offset method.
   * The offsetLite method takes an optional map of key value pairs to configure the way
   * the offset is calculated. Here are the different options.
   *
   * (Boolean) margin - Should the margin of the element be included in the calculations? True by default.
   * (Boolean) border - Should the border of the element be included in the calculations? False by default.
   * (Boolean) padding - Should the padding of the element be included in the calcuations? False by default.
   * (Boolean) scroll - Sould the scroll offsets of the parent elements be included int he 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.
   * (HTML Element) relativeTo - This should be a parent of the element and should have position (like absolute or relative).
   *                             It will retreive the offset relative to this parent element. By default it is the body element.
   *
   * @name offsetLite
   * @param Map options Optional settings to configure the way the offset is calculated.
   * @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
   */
  offsetLite: function(options, returnObject) {
    if (!this[0]) error();
    var x = 0, y = 0, sl = 0, st = 0, parent = this[0], offsetParent,
        options = $.extend({ margin: true, border: false, padding: false, scroll: true, relativeTo: document.body }, options || {});

    // Get the HTMLElement if relativeTo is a jquery collection
    if (options.relativeTo.jquery) options.relativeTo = options.relativeTo[0];

    do {
      x += parent.offsetLeft;
      y += parent.offsetTop;

      offsetParent = parent.offsetParent || document.body;
      if (options.scroll) {
        // get scroll offsets
        do {
          sl += parent.scrollLeft;
          st += parent.scrollTop;
          parent = parent.parentNode;
        } while(parent != offsetParent);
      }
      parent = offsetParent;
    } while (parent && parent.tagName != 'BODY' && parent.tagName != 'HTML' && parent != options.relativeTo);

    var returnValue = handleOffsetReturn(this[0], options, x, y, sl, st);

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

  /**
   * Returns a jQuery collection with the positioned parent of
   * the first matched element. This is the first parent of
   * the element that has position (as in relative or absolute).
   *
   * @name offsetParent
   * @type jQuery
   * @cat Plugins/Dimensions
   */
  offsetParent: function() {
    if (!this[0]) error();
    var offsetParent = this[0].offsetParent;
    while ( offsetParent && (offsetParent.tagName != 'BODY' && $.css(offsetParent, 'position') == 'static') )
      offsetParent = offsetParent.offsetParent;
    return $(offsetParent);
  }
});

/**
 * Throws an error message when no elements are in the jQuery collection
 * @private
 */
var error = function() {
  throw "Dimensions: jQuery collection is empty";
};

/**
 * Handles converting a CSS Style into an Integer.
 * @private
 */
var num = function(el, prop) {
  return parseInt($.css(el.jquery?el[0]:el,prop))||0;
};

/**
 * Handles the return value of the offset and offsetLite methods.
 * @private
 */
var handleOffsetReturn = function(elem, options, x, y, sl, st) {
  if ( !options.margin ) {
    x -= num(elem, 'marginLeft');
    y -= num(elem, 'marginTop');
  }

  // Safari and Opera do not add the border for the element
  if ( options.border && (($.browser.safari && parseInt($.browser.version) < 520) || $.browser.opera) ) {
    x += num(elem, 'borderLeftWidth');
    y += num(elem, 'borderTopWidth');
  } else if ( !options.border && !(($.browser.safari && parseInt($.browser.version) < 520) || $.browser.opera) ) {
    x -= num(elem, 'borderLeftWidth');
    y -= num(elem, 'borderTopWidth');
  }

  if ( options.padding ) {
    x += num(elem, 'paddingLeft');
    y += num(elem, 'paddingTop');
  }

  // do not include scroll offset on the element ... opera sometimes reports scroll offset as actual offset
  if ( options.scroll && (!$.browser.opera || elem.offsetLeft != elem.scrollLeft && elem.offsetTop != elem.scrollLeft) ) {
    sl -= elem.scrollLeft;
    st -= elem.scrollTop;
  }

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

/**
 * Gets the width of the OS scrollbar
 * @private
 */
var scrollbarWidth = 0;
var getScrollbarWidth = function() {
  if (!scrollbarWidth) {
    var testEl = $('<div>')
        .css({
          width: 100,
          height: 100,
          overflow: 'auto',
          position: 'absolute',
          top: -1000,
          left: -1000
        })
        .appendTo('body');
    scrollbarWidth = 100 - testEl
      .append('<div>')
      .find('div')
        .css({
          width: '100%',
          height: 200
        })
        .width();
    testEl.remove();
  }
  return scrollbarWidth;
};

})(jQuery);