/**************************************************
******* script by mayra metaxa on 08/09/2010 *******
 * Based on script from www.youngpup.net
 * dom-drag.js (09.25.2001)
 **************************************************/
 
var auto_scroll = 1;

var Drag = {

	obj : null,

	init : function(o, oRoot, minX, maxX, minY, maxY, bSwapHorzRef, bSwapVertRef, fXMapper, fYMapper)
	{
		o.onmousedown	= Drag.start;

		o.hmode			= bSwapHorzRef ? false : true ;
		o.vmode			= bSwapVertRef ? false : true ;

		o.root = oRoot && oRoot != null ? oRoot : o ;

		if (o.hmode  && isNaN(parseInt(o.root.style.left  ))) o.root.style.left   = "0px";
		if (o.vmode  && isNaN(parseInt(o.root.style.top   ))) o.root.style.top    = "0px";
		if (!o.hmode && isNaN(parseInt(o.root.style.right ))) o.root.style.right  = "0px";
		if (!o.vmode && isNaN(parseInt(o.root.style.bottom))) o.root.style.bottom = "0px";

		o.minX	= typeof minX != 'undefined' ? minX : null;
		o.minY	= typeof minY != 'undefined' ? minY : null;
		o.maxX	= typeof maxX != 'undefined' ? maxX : null;
		o.maxY	= typeof maxY != 'undefined' ? maxY : null;

		o.xMapper = fXMapper ? fXMapper : null;
		o.yMapper = fYMapper ? fYMapper : null;

		o.root.onDragStart	= new Function();
		o.root.onDragEnd	= new Function();	
	},

	start : function(e)
	{
		var o = Drag.obj = this;
		e = Drag.fixE(e);
		var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
		var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
		o.root.onDragStart(x, y);

		o.lastMouseX	= e.clientX;
		o.lastMouseY	= e.clientY;

		if (o.hmode) {
			if (o.minX != null)	o.minMouseX	= e.clientX - x + o.minX;
			if (o.maxX != null)	o.maxMouseX	= o.minMouseX + o.maxX - o.minX;
		} else {
			if (o.minX != null) o.maxMouseX = -o.minX + e.clientX + x;
			if (o.maxX != null) o.minMouseX = -o.maxX + e.clientX + x;
		}

		if (o.vmode) {
			if (o.minY != null)	o.minMouseY	= e.clientY - y + o.minY;
			if (o.maxY != null)	o.maxMouseY	= o.minMouseY + o.maxY - o.minY;
		} else {
			if (o.minY != null) o.maxMouseY = -o.minY + e.clientY + y;
			if (o.maxY != null) o.minMouseY = -o.maxY + e.clientY + y;
		}

		document.onmousemove	= Drag.drag;
		document.onmouseup		= Drag.end;

		return false;
	},

	drag : function(e)
	{
		e = Drag.fixE(e);
		var o = Drag.obj;

		var ey	= e.clientY;
		var ex	= e.clientX;
		var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
		var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
		var nx, ny;

		if (o.minX != null) ex = o.hmode ? Math.max(ex, o.minMouseX) : Math.min(ex, o.maxMouseX);
		if (o.maxX != null) ex = o.hmode ? Math.min(ex, o.maxMouseX) : Math.max(ex, o.minMouseX);
		if (o.minY != null) ey = o.vmode ? Math.max(ey, o.minMouseY) : Math.min(ey, o.maxMouseY);
		if (o.maxY != null) ey = o.vmode ? Math.min(ey, o.maxMouseY) : Math.max(ey, o.minMouseY);

		nx = x + ((ex - o.lastMouseX) * (o.hmode ? 1 : -1));
		ny = y + ((ey - o.lastMouseY) * (o.vmode ? 1 : -1));

		if (o.xMapper)		nx = o.xMapper(y)
		else if (o.yMapper)	ny = o.yMapper(x)

		Drag.obj.root.style[o.hmode ? "left" : "right"] = nx + "px";
		Drag.obj.root.style[o.vmode ? "top" : "bottom"] = ny + "px";
		Drag.obj.lastMouseX	= ex;
		Drag.obj.lastMouseY	= ey;

		Drag.obj.root.onDrag(nx, ny);
		return false;
	},

	end : function()
	{
		document.onmousemove = null;
		document.onmouseup   = null;
		Drag.obj.root.onDragEnd(	parseInt(Drag.obj.root.style[Drag.obj.hmode ? "left" : "right"]), 
									parseInt(Drag.obj.root.style[Drag.obj.vmode ? "top" : "bottom"]));
		Drag.obj = null;
	},

	fixE : function(e)
	{
		if (typeof e == 'undefined') e = window.event;
		if (typeof e.layerX == 'undefined') e.layerX = e.offsetX;
		if (typeof e.layerY == 'undefined') e.layerY = e.offsetY;
		return e;
	}
};



var scrolling = {
  init:   function(id) {

	if (document.getElementById("textareadiv"+id))
	{
		scrolling.docH = $("#textdiv"+id).height();	//document.getElementById("textdiv"+id).offsetHeight;
		scrolling.contH = $("#textareadiv"+id).height();	//document.getElementById("textareadiv"+id).offsetHeight;
		
		scrolling.scrollAreaH = $("#scrollArea"+id).height();	//document.getElementById("scrollArea"+id).offsetHeight;		
		//scrolling.scrollH = 81;
		scrolling.scrollH = (scrolling.contH * scrolling.scrollAreaH) / scrolling.docH;

		//alert(scrolling.docH +" "+ scrolling.contH); //296 290
		if (scrolling.docH <= scrolling.contH)			
		{
			scrolling.scrollH = 0;
			//document.getElementById("scroller"+id).style.height = "0px";
			document.getElementById('scrollArea'+id).style.display = "none";
		}
		else
		{	
			document.getElementById('scrollArea'+id).style.display = "block";
			scrolling.scrollAreaH = $("#scrollArea"+id).height();	//document.getElementById("scrollArea"+id).offsetHeight;
			scrolling.scrollH = (scrolling.contH * scrolling.scrollAreaH) / scrolling.docH;
						
			document.getElementById('scroller'+id).style.display = "block";
			document.getElementById('scroller'+id).style.height = scrolling.scrollH+"px";

			scrolling.scrollDist = Math.abs(Math.round(scrolling.scrollAreaH-scrolling.scrollH));
			Drag.init(document.getElementById("scroller"+id),null,0,0,-1,scrolling.scrollDist);
		}		
		
		//add ondrag function
		document.getElementById("scroller"+id).onDrag = function (x,y) 
		{
		  var scrollY = parseInt(document.getElementById("scroller"+id).style.top);
		  var docY = 0 - (scrollY * (scrolling.docH - scrolling.contH) / scrolling.scrollDist);
		  document.getElementById("textdiv"+id).style.top = docY + "px";
		}
	
	}
  }
}

/**/

function wheel(event)
{
	var delta = 0;
	if (!event) /* For IE. */
			event = window.event;
	if (event.wheelDelta) { /* IE/Opera. */
		delta = event.wheelDelta/120;
		if (window.opera)
			delta = -delta;
	} else if (event.detail) { /** Mozilla case. */
		delta = -event.detail/3;
	}
	
	/**/
	
	var docH = $("#textdiv"+triggered).height();	//document.getElementById("textdiv"+id).offsetHeight;
	var contH = $("#textareadiv"+triggered).height();	//document.getElementById("textareadiv"+id).offsetHeight;
	
	var scrollAreaH = $("#scrollArea"+triggered).height();	//document.getElementById("scrollArea"+id).offsetHeight;		
	//scrolling.scrollH = 81;
	var scrollH = (contH * scrollAreaH) / docH;
	var scrollDist =  Math.abs(Math.round(scrollAreaH-scrollH));
	
	var scr = parseInt(document.getElementById("scroller"+triggered).style.top);
	
	var scroll_vima = 10;
	
	if (delta>0)	//up
		scr = scr - scroll_vima;
	else	//down
		scr = scr + scroll_vima;
	
	if ( (scr>=-6) && (scr<=(scrollDist+(scroll_vima-3))) )
	{
		document.getElementById("scroller"+triggered).style.top =  scr +"px";
		
		var scrollY = parseInt(document.getElementById("scroller"+triggered).style.top);
		var docY = 0 - (scrollY * (docH - contH) / scrollDist);
		document.getElementById("textdiv"+triggered).style.top = docY + "px";
	}
	
	if (event.preventDefault)
                event.preventDefault();
	event.returnValue = false;
	
}

/**/

function load_scrolls()
{
	scrolling.init(1);
}

onload = load_scrolls;


var triggered = "";
	
$(function()
{
	$("[id^='textareadiv']").mouseover(function() {
		triggered = this.id.replace("textareadiv","");
		if (window.addEventListener)
			window.addEventListener('DOMMouseScroll', wheel, false);
		window.onmousewheel = document.onmousewheel = wheel;			
	}).mouseout(function(){
		if (window.removeEventListener)
			window.removeEventListener('DOMMouseScroll', wheel, false);
		window.onmousewheel = document.onmousewheel = null;
	});

});