/* 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 14:14:11 -0400 (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 && Math.min(document.documentElement.clientHeight,document.body.clientHeight);
                    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);