/* $Id: autogrow.js 62 2009-02-18 02:59:27Z john $ */

// This file will no longer be included by default. A minified version is included as part of core-min.js



/*
* SocialEngineMods Javascript Library Lite v0.1
* http://www.SocialEngineMods.Net
*
* Copyright SocialEngineMods.Net
* This code is licensed GPL for use exclusively on SocialEngine sites
*
*/




function showMusic() {
	  var elem, vis;
	  if( document.getElementById ) // this is the way the standards work
	    elem = document.getElementById( 'music-bewerbung' );
	  else if( document.all ) // this is the way old msie versions work
	      elem = document.all['music-bewerbung'];
	  else if( document.layers ) // this is the way nn4 works
	    elem = document.layers['music-bewerbung'];
	  vis = elem.style;
	  // if the style.display value is blank we try to figure it out here
	  if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)
	    vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';
	  vis.display = (vis.display==''||vis.display=='block')?'none':'block';
	  return false;	}

/* Extensions */


Function.prototype.bind = function(obj) {
	var method = this, temp = function() {
		return method.apply(obj, arguments)
	};
	return(temp);
};


/* SEMods */


SEMods = function () {};

/* SEMods TextAreaControl */


SEMods.TextAreaControl = function(object) {
		this.obj = object;
		this.obj.style['overflow'] = 'hidden';
		this.originalHeight = this.obj.getStyle('height').toInt();
		var updater = this.update.bind(this);
		object.addEvent("focus", this.onFocus.bind(this));
		object.addEvent("blur", this.onBlur.bind(this));
		this.update();
};

SEMods.TextAreaControl.prototype = {
		obj : null,
		updating : false,
		autoGrow : false,
		originalHeight : null,
		shadowElement : null,
		increment : 0,
		timer : null,
		lastLength : 0,

		setAutoGrow : function(autoGrow) {
				this.autoGrow = autoGrow;
				this.createShadowElement();
				this.update();
		},

		onUpdate : function() {
				if(this.autoGrow && this.lastLength != this.obj.value.length) {
						this.lastLength = this.obj.value.length;
						this.updateShadowElement();
						this.obj.style.height = Math.max(this.originalHeight, this.shadowElement.offsetHeight + this.increment) + 'px';
				}
		},

		beginUpdate : function() {
				if(this.updating)
						return false;
				this.updating = true;
				return true;
		},

		endUpdate : function() {
				this.updating = false;
		},

		update : function() {
				if(!this.beginUpdate())
						return;

				this.onUpdate();
				this.endUpdate();
		},

		createShadowElement : function() {
				if(this.shadowElement)
						return;

				this.shadowElement = document.createElement("DIV");
				this.shadowElement.style.position = "absolute";
				this.shadowElement.style.top = "-99999px";
				this.shadowElement.style.left = "-99999px";

				document.body.appendChild(this.shadowElement);
		},

		updateShadowElement : function () {
				if(this.shadowElement) {
			text = this.obj.value+'<br />';
						this.shadowElement.innerHTML = text.toString().replace(/&/g, '&amp;').replace(/"/g, '&quot;').replace(/'/g, '&#039;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/\n/g, '<br />');
						var fontSize = this.getPXMetrics( this.obj.getStyle('font-size'), 10);
						var lineHeight = this.obj.getStyle('line-height');
						// Opera misses on line-height
						if((/Opera/i.test(navigator.userAgent)))
							lineHeight = this.getPXMetrics( lineHeight, 0) + 3 + 'px';

						this.increment = fontSize + 10;

						this.shadowElement.style['width'] = this.obj.offsetWidth + 'px';
						this.shadowElement.style['lineHeight'] = lineHeight;
						this.shadowElement.style['fontSize'] = this.obj.getStyle('font-size');

						this.shadowElement.style['fontFamily'] = this.obj.getStyle('font-family');
						this.shadowElement.style['paddingLeft'] = this.obj.getStyle('padding-left');
						this.shadowElement.style['paddingRight'] = this.obj.getStyle('padding-right');

				}
		},

		onFocus : function() {
			this.timer = setInterval(this.update.bind(this), 500);
		},

		onBlur : function() {
			if(this.timer) {
				clearInterval(this.timer);
				this.timer = null;
			}
		},

		// em's not supported for now
		getPXMetrics : function(metric, defvalue) {
			var metricBase = parseFloat(metric);
			if(isNaN(metricBase)) return defvalue!=null ? defvalue : metricBase;
			return /px/i.test(metric) ? metricBase : /pt/i.test(metric) ? 1.3333*metricBase  : metricBase;
		}

};


/* Global namespace helper functions */


function textarea_autogrow(elementid) {
		var el = $(elementid);
//    if(!el) alert("textarea_autogrow(): element not found");
		if(el && !el._controlled) {
				el._controlled = true;
				new SEMods.TextAreaControl(el).setAutoGrow(true);
	return el.getStyle('height').toInt();
		}
};