// Versao 1.0 
// bugs conhecidos - resize no netscape, perde a configuração
// possivel solucao - onresize no body


// pre-load das imagens - seguir o exemplo "awscroll/images/default"

	img_up_pre  = new Image();
	img_dn_pre  = new Image();
	img_vkb_pre = new Image();
	img_vbg_pre = new Image();
	
	img_up_pre.src = "../shared/scroll_up.gif";
	img_dn_pre.src = "../shared/scroll_down.gif";
	img_vkb_pre.src = "../shared/scroll_slider.gif";
	img_vbg_pre.src = "../shared/scroll_bg.gif";

// inicializacoes de browsers
	window.onerror=null;
	NS = (document.layers) ? 1:0
	IE = (document.all) ? 1:0
	Opera = 0;
	gecko = (document.getElementById) ? 1:0
		loaded=0;
		layerPreStart = "";
		layerStart = "";
		layerLeft = ".left";
		layerTop = ".top";
		layerWidth = ".width"
		layerHeight = ".height"
		layerStyle = ""; 
	if (NS) 
	{
		layerPreStart = "document.divCont.";
		layerStart = "document.";
		layerStyle = "";  
	}
	if (gecko || IE)
	{
		layerStart = "document.getElementById('";
		layerStyle = "').style"; 
	}
	if (IE && !gecko)
	{
		layerStart = "document.all.";
		layerStyle = ".style"; 
	}
	if (navigator.appName.indexOf('Opera') != -1)
	{ 
		Opera=1; 
	}


	// ponteiros de estado
	pageY = 0;sAmount = 0;
	cUp=0; cDown=0; cBar=0; mDown=0;



function inicializaScrollBar()
{

txt_w = 445;
txt_h = 290;

txt_x = 170 //  left(document.body.clientWidth-txt_w)/2+90;
txt_y = 140 //  top(document.body.clientHeight-txt_h)/2+50;

leParametrosScrollBar();

	//calcula as posicoes do botao up
	btn1_x = txt_x + txt_w + margin;
	btn1_y = txt_y;

	//calcula as posicoes do botao down
	btn2_x = txt_x + txt_w + margin;
	btn2_y = txt_y + txt_h - btn_h;


   // calcula a area e as coordenadas da area de scroll
	sarea_y = txt_y;
	sarea_x = txt_x + txt_w + margin; 
	sarea_h = txt_h; // - (btn_h * 2);
	sarea_w = btn_w;  
	sarea_h_real = txt_h - (btn_h *2);
	// posicao inicial do knob y,x
	knob_y = sarea_y + btn_h;
	knob_x = sarea_x; 

	travel = sarea_h - (btn_h * 2) - knob_h; //aqui

	//carga dos styles
	//bloco de styles
    /*
	document.writeln("<style type=\"text/css\">")
	document.writeln("#divCont     {position:absolute; left:0; top:0; width:" +txt_w+ "; height:" +txt_h+ ";clip:rect(0px," +txt_w+ "px," +txt_h+ "px,0px);z-index:2000;visibility:hidden; overflow: hidden;}")
	document.writeln("#divTextCont {position:absolute; left:0; top:0;z-index:1000;}")
	document.writeln("#scrollbtnup {position:absolute; left:0; top:0; width:" +btn_w+ "; height:" +btn_h+ ";z-index:1500;visibility:hidden;}")
	document.writeln("#scrollbtndn {position:absolute; left:0; top:0; width:" +btn_w+ "; height:" +btn_h+ ";z-index:1500;visibility:hidden;}")
	document.writeln("#scrollbkg   {position:absolute; left:0; top:0; width:" +btn_w+ "; height:" +btn_h+ ";z-index:1000;visibility:hidden;}")
	document.writeln("#sliderknob  {position:absolute; left:0; top:0; width:" +btn_w+ "; height:" +btn_h+ ";z-index:2000;visibility:hidden;}")
	document.writeln("</style>")
*/

awscroll_setup();

}


function awscroll_setup()
{ 
	loaded=1; // indica que foi carrega

	// monta as imagens certas
	if (NS)
	{
		document.scrollbtnup.document.imgup.src    = img_up_pre.src
		document.scrollbtndn.document.imgdn.src    = img_dn_pre.src
		document.sliderknob.document.img_vkb.src   = img_vkb_pre.src
		document.scrollbkg.document.img_vbg.src   = img_vbg_pre.src
	}
	if (IE)
	{
		document.all.scrollbtnup.document.imgup.src    = img_up_pre.src
		document.all.scrollbtnup.document.imgup.width  = btn_w
		document.all.scrollbtnup.document.imgup.height = btn_h
		
		document.all.scrollbtnup.document.imgdn.src    = img_dn_pre.src
		document.all.scrollbtnup.document.imgdn.width  = btn_w
		document.all.scrollbtnup.document.imgdn.height = btn_h
		
		document.all.sliderknob.document.img_vkb.src    = img_vkb_pre.src
		document.all.sliderknob.document.img_vkb.width  = knob_w
		document.all.sliderknob.document.img_vkb.height = knob_h
		
		document.all.scrollbkg.document.img_vbg.src    = img_vbg_pre.src
		document.all.scrollbkg.document.img_vbg.width  = btn_w
		document.all.scrollbkg.document.img_vbg.height = txt_h - (btn_h * 2)
	}

	//posiciona os elementos dos layers a partir das configuracoes
	//conteudo
	eval(layerStart+"divCont"+layerStyle+layerLeft+" = " + txt_x);eval(layerStart+"divCont"+layerStyle+layerTop+" = " + txt_y);
	eval(layerStart+"divCont"+layerStyle+layerWidth+" = " + txt_w);eval(layerStart+"divCont"+layerStyle+layerHeight+" = " + txt_h);
	//knob (caixinha do scroll)
	eval(layerStart+"sliderknob"+layerStyle+layerLeft+" = " + knob_x);eval(layerStart+"sliderknob"+layerStyle+layerTop+" = " + knob_y);
	//fundo do scroll
	eval(layerStart+"scrollbkg"+layerStyle+layerLeft+" = " + sarea_x);eval(layerStart+"scrollbkg"+layerStyle+layerTop+" = " + knob_y);
	//botao de up
	eval(layerStart+"scrollbtnup"+layerStyle+layerLeft+" = " + btn1_x);eval(layerStart+"scrollbtnup"+layerStyle+layerTop+" = " + btn1_y);
	//botao de down
	eval(layerStart+"scrollbtndn"+layerStyle+layerLeft+" = " + btn2_x);eval(layerStart+"scrollbtndn"+layerStyle+layerTop+" = " + btn2_y);

	if (NS)    {conH=document.divCont.document.divTextCont.document.height;}
	if (IE)    {conH=document.all.divTextCont.offsetHeight;} //document.height
	if (gecko) {conH=document.getElementById('divTextCont').offsetHeight;}
	if (Opera) {conH=document.getElementById('divTextCont').offsetHeight;}

	//inicializa o monitoramento
	if (conH > sarea_h) //aqui era
	{
		t_refreshID = setInterval ("fix()",t_refresh);
		sAmount = conH-sarea_h;reveal();
	}
	else
	{
		eval(layerStart+"divCont"+layerStyle+".visibility = 'visible'");
	}
		if (NS) 
	{
		window.captureEvents(Event.MOUSEMOVE | Event.MOUSEDOWN | Event.MOUSEUP | Event.CLICK | Event.KEYPRESS);
		window.onMouseMove = moveHandler;
		window.onMouseDown = StartE;
		window.onMouseUp = EndE;
		window.onKeyPress = KeyboardE;
	}
	else if (IE)
	{
		document.onmousemove=moveHandler;
		document.onmousedown=StartE;
		document.onmouseup=EndE;
		document.ondragstart=StartE;
		document.onkeyup = KeyboardE;
	}
	else if (gecko)
	{
		document.ondragstart = StartE;
		document.addEventListener("mousedown", StartE, true);
		document.addEventListener("mousemove", moveHandler, true);
		document.addEventListener("mouseup", EndE, true);
	}
}

function reveal()
{
	if (conH >= sarea_h) 
	{
		eval(layerStart+"scrollbkg"+layerStyle+".visibility = 'visible'");
		eval(layerStart+"sliderknob"+layerStyle+".visibility = 'visible'");
		eval(layerStart+"scrollbtnup"+layerStyle+".visibility = 'visible'");
		eval(layerStart+"scrollbtndn"+layerStyle+".visibility = 'visible'");
		eval(layerStart+"divCont"+layerStyle+".visibility = 'visible'");
	}
}

function moveHandler(e)
{
	if (NS || IE || gecko || Opera)
	{
		if (loaded && NS) 
		{
			reveal();
		}
		Xpos = (IE)?event.x:e.pageX
		Ypos = (IE)?event.y:e.pageY 
		//se esta dentro da posicao x do scroll
		if ((Xpos >= sarea_x) && (Xpos <= sarea_x+sarea_w)) 
		{ 
			//se esta na altura do botao
			if ((Ypos >= sarea_y) && (Ypos <= sarea_y+btn_h))  
			{
				cUp=1; cDown=0; cBar=0; 
			}
			if ((Ypos >  sarea_y+btn_h) && (Ypos < btn2_y)) 
			{ 
				cUp=0; cDown=0; cBar=1; 
			}
			if ((Ypos >= btn2_y) && (Ypos <= btn2_y+btn_h)) 
			{ 
				cUp=0; cDown=1; cBar=0; 
			}
		}
		else 
		{ 
			cUp=0;cDown=0;cBar=0;mDown=0;
		}
	}
}

function EndE() 
{ 
	mDown=0;
	if (IE)
	{
		 return false;
	}
}
// funcao nao implementada
// visa responder as setas do teclado
function KeyboardE(e)
{ 
	if (NS)
	{
		mDown=1;
		//se teclou espacos
		if (e.which==32)
		{
			cUp=0; cDown=1; cBar=0;
		}
	}

	if (IE)
	{
	//alert(event.which)
	return false;
	}
}

function StartE() 
{ 
	mDown=1;
	if (cBar || cDown || cUp || IE)
	{
		 return false;
	}
}

function fix() 
{
	if (mDown && cBar) 
	{
		where = Ypos-(knob_h/2); 
		if (where < knob_y) 
		{ 
			where=knob_y; 
		}
		if (where > btn2_y - knob_h ) 
		{
			 where = btn2_y - knob_h; 
		}
		eval(layerStart+"sliderknob"+layerStyle+layerTop+" = where"); 
		pageY = -((where-knob_y)/travel) * sAmount;
		eval(layerPreStart+layerStart+"divTextCont"+layerStyle+layerTop+" = pageY"); 
	}
	if (mDown && (cUp || cDown)) 
	{
		Clicker(); 
	}
}

function Clicker() 
{
	if ((cUp && (pageY < 0)) || (cDown && (pageY > (-sAmount))) || cBar) 
	{
		if (cUp) 
		{ 
			pageY = pageY + space;
			if (pageY > 0) 
			{
				pageY = 0; 
			}
		}
		else if (cDown) 
		{ 
			pageY = pageY - space;
			if (pageY < (-sAmount)) 
			{ 
				pageY = (-sAmount); 
			}
		}
		else if (cBar) //notar que o knob para seu centro no ponteiro do mouse
		{ 
			pageY = -(((Ypos-(knob_h/2))-(sarea_y+btn_h))/travel) * sAmount; 
		}
		eval(layerPreStart+layerStart+"divTextCont"+layerStyle+layerTop+" = pageY");
		where = sarea_y+btn_h-((pageY/sAmount)*travel);
		if (where < sarea_y+btn_h)
		{ 
			where=sarea_y+btn_h; 
		} 
		if (where > sarea_h+sarea_y-btn_h-knob_h) 
		{ 
			where=sarea_h+sarea_y-btn_h-knob_h; 
		}
		eval(layerStart+"sliderknob"+layerStyle+layerTop+" = where"); 
	}
}
function topper() 
{
	where=knob_y;
	pageY=0;
	eval(layerStart+"sliderknob"+layerStyle+layerTop+" = where"); 
	eval(layerPreStart+layerStart+"divTextCont"+layerStyle+layerTop+" = pageY");
}