/**

 * Interface Elements for jQuery

 * Expander

 * 

 * http://interface.eyecon.ro

 * 

 * Copyright (c) 2006 Stefan Petre

 * Dual licensed under the MIT (MIT-LICENSE.txt) 

 * and GPL (GPL-LICENSE.txt) licenses.

 *   

 *

 */

/**

 * Expands text and textarea elements while new characters are typed to the a miximum width

 *

 * @name Expander

 * @description Expands text and textarea elements while new characters are typed to the a miximum width

 * @param Mixed limit integer if only expands in width, array if expands in width and height

 * @type jQuery

 * @cat Plugins/Interface

 * @author Stefan Petre

 */

jQuery.iExpander =

{

	helper : null,

	expand : function()

	{

		text = this.value;

		if (!text)

			return;

		style = {

			fontFamily: jQuery(this).css('fontFamily')||'',

			fontSize: jQuery(this).css('fontSize')||'',

			fontWeight: jQuery(this).css('fontWeight')||'',

			fontStyle: jQuery(this).css('fontStyle')||'',

			fontStretch: jQuery(this).css('fontStretch')||'',

			fontVariant: jQuery(this).css('fontVariant')||'',

			letterSpacing: jQuery(this).css('letterSpacing')||'',

			wordSpacing: jQuery(this).css('wordSpacing')||''

		};

		jQuery.iExpander.helper.css(style);

		html = jQuery.iExpander.htmlEntities(text);

		html = html.replace(new RegExp( "\\n", "g" ), "<br />");

		jQuery.iExpander.helper.html('pW');

		spacer = jQuery.iExpander.helper.get(0).offsetWidth;

		jQuery.iExpander.helper.html(html);

		width = jQuery.iExpander.helper.get(0).offsetWidth + spacer;

		if (this.Expander.limit && width > this.Expander.limit[0]) {

			width = this.Expander.limit[0];

		}

		this.style.width = width + 'px';

		if (this.tagName == 'TEXTAREA') {

			height = jQuery.iExpander.helper.get(0).offsetHeight + spacer;

			if (this.Expander.limit && height > this.Expander.limit[1]) {

				height = this.Expander.limit[1];

			}

			this.style.height = height + 'px';

		}

	},

	htmlEntities : function(text)

	{ 

		entities = {

			'&':'&',

			'<':'&lt;',

			'>':'>',

			'"':'"'

		};

		for(i in entities) {

			text = text.replace(new RegExp(i,'g'),entities[i]);

		}

		return text;

	},

	build : function(limit)

	{

		if (jQuery.iExpander.helper == null) {

			jQuery('body', document).append('<div id="expanderHelper" style="position: absolute; top: 0; left: 0; visibility: hidden;"></div>');

			jQuery.iExpander.helper = jQuery('#expanderHelper');

		}

		return this.each(

			function()

			{

				if (/TEXTAREA|INPUT/.test(this.tagName)) {

					if (this.tagName == 'INPUT') {

						elType = this.getAttribute('type');

						if (!/text|password/.test(elType)) {

							return;

						}

					}

					if (limit && (limit.constructor == Number || (limit.constructor == Array && limit.length == 2))) {

						if (limit.constructor == Number)

							limit = [limit, limit];

						else {

							limit[0] = parseInt(limit[0])||400;

							limit[1] = parseInt(limit[1])||400;

						}

						this.Expander = {

							limit : limit

						};

					}

					jQuery(this)

						.blur(jQuery.iExpander.expand)

						.keyup(jQuery.iExpander.expand)

						.keypress(jQuery.iExpander.expand);

					jQuery.iExpander.expand.apply(this);

				}

			}

		);			

	}

};

jQuery.fn.Autoexpand = jQuery.iExpander.build;