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/**

* CSS-JS-BOOSTER

* 

* A polyfill for box-sizing: border-box for IE6 & IE7.

* 

* JScript

* 

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU Lesser General Public License as published 

* by the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

* 

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU Lesser General Public License for more details.

* 

* See <http://www.gnu.org/licenses/lgpl-3.0.txt>

* 

* @category  JScript 

* @package   box-sizing-polyfill

* @author    Christian Schepp Schaefer <schaepp@gmx.de> <http://twitter.com/derSchepp>

* @copyright 2010 Christian Schepp Schaefer

* @license   http://www.gnu.org/copyleft/lesser.html The GNU LESSER GENERAL PUBLIC LICENSE, Version 3.0

* @link      http://github.com/Schepp/box-sizing-polyfill 

*

* PREFACE:

*

* This box-sizing polyfill is based on previous work done by Erik Arvidsson, 

* which he published in 2002 on http://webfx.eae.net/dhtml/boxsizing/boxsizing.html.

*

* USAGE:

* 	

* Add the behavior/HTC after every `box-sizing: border-box;` that you assign:

* 

* box-sizing: border-box;

* *behavior: url(/scripts/boxsizing.htc);`

* 

* If you prefix the `behavior` property with a star, like seen above, it will only be seen by 

* IE6 & IE7, not by IE8+ (it's a hack) which is better for the performance on those newer browsers.

*

* The URL to the HTC file must be relative to your HTML(!) document, not relative to your CSS.

* That's why I'd advise you to use absolute paths like in the example.

*

*/

<component lightWeight="true">

<attach event="onpropertychange" onevent="checkPropertyChange()" />

<attach event="ondetach" onevent="restore()" />

<attach event="onresize" for="window" onevent="restore();init()" />

<script type="text/javascript">

//<![CDATA[

var viewportwidth = (typeof window.innerWidth != 'undefined' ? window.innerWidth : element.document.documentElement.clientWidth);

// Shortcut for the document object

var doc = element.document;

/*

* init gets called once at the start and then never again, 

* triggers box-sizing calculations and updates width and height

*/

function init(){

	// check for IE8+

	if(typeof(element.style.boxSizing) == "undefined"){

		updateBorderBoxWidth();

		updateBorderBoxHeight();

	}

}

/*

* restore gets called when the behavior is being detached (see event binding at the top),

* resets everything like it was before applying the behavior

*/

function restore(){

	// check for IE8+

	if(typeof(element.style.boxSizing) == "undefined"){

		element.runtimeStyle.width = "";

		element.runtimeStyle.height = "";

	}

}

/*

* checkPropertyChange gets called as soon as an element property changes 

* (see event binding at the top), it then checks if any property influencing its 

* dimensions was changed and if yes recalculates width and height 

*/

function checkPropertyChange(){

	// check for IE8+

	if(typeof(element.style.boxSizing) == "undefined"){

		var pn = event.propertyName;

		var undef;

		if(pn == "style.boxSizing" && element.style.boxSizing == ""){

			element.style.removeAttribute("boxSizing");

			element.runtimeStyle.boxSizing = undef;

		}

		switch (pn){

			case "style.width":

			case "style.borderLeftWidth":

			case "style.borderLeftStyle":

			case "style.borderRightWidth":

			case "style.borderRightStyle":

			case "style.paddingLeft":

			case "style.paddingRight":

				updateBorderBoxWidth();

			break;

			case "style.height":

			case "style.borderTopWidth":

			case "style.borderTopStyle":

			case "style.borderBottomWidth":

			case "style.borderBottomStyle":

			case "style.paddingTop":

			case "style.paddingBottom":

				updateBorderBoxHeight();

			break;

			case "className":

			case "style.boxSizing":

				updateBorderBoxWidth();

				updateBorderBoxHeight();

			break;

		}

	}

}

/* 

 * Helper function, taken from Dean Edward's IE7 framework,

 * added by Schepp on 12.06.2010.

 * http://code.google.com/p/ie7-js/

 *

 * Allows us to convert from relative to pixel-values.

 */

function getPixelValue(value){

	var PIXEL = /^\d+(px)?$/i;

	if (PIXEL.test(value)) return parseInt(value);

	var style = element.style.left;

	var runtimeStyle = element.runtimeStyle.left;

	element.runtimeStyle.left = element.currentStyle.left;

	element.style.left = value || 0;

	value = parseInt(element.style.pixelLeft);

	element.style.left = style;

	element.runtimeStyle.left = runtimeStyle;

	return value;

}

function getPixelWidth(object, value){

	// For Pixel Values

	var PIXEL = /^\d+(px)?$/i;

	if (PIXEL.test(value)) return parseInt(value);

	// For Percentage Values

	var PERCENT = /^[\d\.]+%$/i;

	if (PERCENT.test(value)){

		try{

			parentWidth = getPixelWidth(object.parentElement,(object.parentElement.currentStyle.width != "auto" ? object.parentElement.currentStyle.width : "100%"));

			value = (parseFloat(value) / 100) * parentWidth;

		}

		catch(e){

			value = (parseFloat(value) / 100) * element.document.documentElement.clientWidth;

		}

		return parseInt(value);

	}

	// For EM Values

	var style = object.style.left;

	var runtimeStyle = object.runtimeStyle.left;

	object.runtimeStyle.left = object.currentStyle.left;

	object.style.left = value || 0;

	value = parseInt(object.style.pixelLeft);

	object.style.left = style;

	object.runtimeStyle.left = runtimeStyle;

	return value;

}

/*

 * getBorderWidth & friends

 * Border width getters

 */

function getBorderWidth(sSide){

	if(element.currentStyle["border" + sSide + "Style"] == "none"){

		return 0;

	}

	var n = getPixelValue(element.currentStyle["border" + sSide + "Width"]);

	return n || 0;

}

function getBorderLeftWidth() { return getBorderWidth("Left"); }

function getBorderRightWidth() { return getBorderWidth("Right"); }

function getBorderTopWidth() { return getBorderWidth("Top"); }

function getBorderBottomWidth() { return getBorderWidth("Bottom"); }

/*

 * getPadding & friends

 * Padding width getters

 */

function getPadding(sSide) {

	var n = getPixelValue(element.currentStyle["padding" + sSide]);

	return n || 0;

}

function getPaddingLeft() { return getPadding("Left"); }

function getPaddingRight() { return getPadding("Right"); }

function getPaddingTop() { return getPadding("Top"); }

function getPaddingBottom() { return getPadding("Bottom"); }

/*

 * getBoxSizing

 * Get the box-sizing value for the current element

 */

function getBoxSizing(){

	var s = element.style;

	var cs = element.currentStyle

	if(typeof s.boxSizing != "undefined" && s.boxSizing != ""){

		return s.boxSizing;

	}

	if(typeof s["box-sizing"] != "undefined" && s["box-sizing"] != ""){

		return s["box-sizing"];

	}

	if(typeof cs.boxSizing != "undefined" && cs.boxSizing != ""){

		return cs.boxSizing;

	}

	if(typeof cs["box-sizing"] != "undefined" && cs["box-sizing"] != ""){

		return cs["box-sizing"];

	}

	return getDocumentBoxSizing();

}

/*

 * getDocumentBoxSizing

 * Get the default document box sizing (check for quirks mode)

 */

function getDocumentBoxSizing(){

	if(doc.compatMode == null || doc.compatMode == "BackCompat"){

		return "border-box";

	}

	return "content-box"

}

/*

 * setBorderBoxWidth & friends

 * Width and height setters

 */

function setBorderBoxWidth(n){

	element.runtimeStyle.width = Math.max(0, n - getBorderLeftWidth() -

		getPaddingLeft() - getPaddingRight() - getBorderRightWidth()) + "px";

}

function setBorderBoxHeight(n){

	element.runtimeStyle.height = Math.max(0, n - getBorderTopWidth() -

		getPaddingTop() - getPaddingBottom() - getBorderBottomWidth()) + "px";

}

function setContentBoxWidth(n){

	element.runtimeStyle.width = Math.max(0, n + getBorderLeftWidth() +

		getPaddingLeft() + getPaddingRight() + getBorderRightWidth()) + "px";

}

function setContentBoxHeight(n){

	element.runtimeStyle.height = Math.max(0, n + getBorderTopWidth() +

		getPaddingTop() + getPaddingBottom() + getBorderBottomWidth()) + "px";

}

/*

 * updateBorderBoxWidth & updateBorderBoxHeight

 * 

 */

function updateBorderBoxWidth() {

	if(getDocumentBoxSizing() == getBoxSizing()){

		return;

	}

	var csw = element.currentStyle.width;

	if(csw != "auto"){

		csw = getPixelWidth(element,csw);

		if(getBoxSizing() == "border-box"){

			setBorderBoxWidth(parseInt(csw));

		}

		else{

			setContentBoxWidth(parseInt(csw));

		}

	}

}

function updateBorderBoxHeight() {

	if(getDocumentBoxSizing() == getBoxSizing()){

		return;

	}

	var csh = element.currentStyle.height;

	if(csh != "auto"){

		csh = getPixelValue(csh);

		if(getBoxSizing() == "border-box"){

			setBorderBoxHeight(parseInt(csh));

		}

		else{

			setContentBoxHeight(parseInt(csh));

		}

	}

}

// Run the calculations

init();

//]]>

</script>

</component>