/*
CUSTOM FORM ELEMENTS

Created by Ryan Fait
www.ryanfait.com

The only thing you need to change in this file is the following
variables: checkboxHeight, radioHeight and selectWidth.

Replace the first two numbers with the height of the checkbox and
radio button. The actual height of both the checkbox and radio
images should be 4 times the height of these two variables. The
selectWidth value should be the width of your select list image.

You may need to adjust your images a bit if there is a slight
vertical movement during the different stages of the button
activation.



Visit http://ryanfait.com/ for more information.

Adaptada por Henrique Fontana
henrique@pracpd.com.br

Adaptações
- Utilização sem mouse
- Função para aplicar o efeito em selects criados dinamicamente: select_style(objeto).
-	O efeito é aplicado de acordo com a classe do select (obrigatória):
	styled - select padrao
	styled2 - select padrao dia e mes
	styled3 - select padrao ano
- selects alterados via javascript aplicar:
	objeto.onchange();
- ver arquivo teste.html para exemplos
*/

//Variáveis base
var checkboxHeight = "13";
var radioHeight = "25";

/* No need to change anything after this */

document.write('<style type="text/css">input.styled { position:absolute; margin-left:-16px; z-index: -1; opacity: 0; filter: alpha(opacity=0); width:1px; height:1px; } select.styled, select.styled2, select.styled3, select.styled4 { position: relative; opacity: 0; filter: alpha(opacity=0); z-index: 5; }</style>');

function select_style(objeto) {
	option = objeto.getElementsByTagName("option");
	active = option[0].childNodes[0].nodeValue;
	textnode = document.createTextNode(active);
	for(b = 0; b < option.length; b++) {
		if(option[b].selected == true) {
			textnode = document.createTextNode(option[b].childNodes[0].nodeValue);
		}
	}
	var estilo_select = "select";
	switch (objeto.className) {
		case "styled2":
			estilo_select = "select2";
			break;
		case "styled3":
			estilo_select = "select3";
			break;
		case "styled4":
			estilo_select = "select4";
			break;
		default:
			estilo_select = "select";
			break;
	}
	span = document.createElement("span");
	span.className = estilo_select;
	//span.id = "select" + objeto.name;
	span_interno = document.createElement("span");
	span_interno.appendChild(textnode);
	span.appendChild(span_interno);
	objeto.parentNode.insertBefore(span, objeto);
	objeto.filho = span_interno;
	//Mantem função onchange, onfocus e onblur
	objeto.origOnchange = objeto.onchange;
	objeto.origOnfocus = objeto.onfocus;
	objeto.origOnblur = objeto.onblur;
	//Aplica as funções
	objeto.onchange = Custom.choose;
	objeto.onfocus = Custom.sfocus;
	objeto.onblur = Custom.sblur;
}

var Custom = {
	init: function() {
		var inputs = document.getElementsByTagName("input"), span = Array(), textnode, option, active;
		for(a = 0; a < inputs.length; a++) {
			if((inputs[a].type == "checkbox" || inputs[a].type == "radio") && inputs[a].className == "styled") {
				span[a] = document.createElement("span");
				span[a].className = inputs[a].type;

				if(inputs[a].checked == true) {
					if(inputs[a].type == "checkbox") {
						position = "0 -" + (checkboxHeight*2) + "px";
						span[a].style.backgroundPosition = position;
					} else {
						position = "0 -" + (radioHeight*2) + "px";
						span[a].style.backgroundPosition = position;
					}
				}
				inputs[a].parentNode.insertBefore(span[a], inputs[a]);
				inputs[a].origChange = inputs[a].onchange;
				inputs[a].onchange = Custom.clear;
				inputs[a].onpropertychange = Custom.clear;
				inputs[a].onfocus = Custom.cfocus;
				inputs[a].origOnclick = inputs[a].onclick;
				inputs[a].onblur = Custom.cblur;
				span[a].onmousedown = Custom.pushed;
				span[a].onmouseup = Custom.check;
				span[a].onclick = inputs[a].origOnclick;
				document.onmouseup = Custom.clear;
			}
		}
		inputs = document.getElementsByTagName("select");
		for(a = 0; a < inputs.length; a++) {
			if(inputs[a].className == "styled" || inputs[a].className == "styled" || inputs[a].className == "styled2" || inputs[a].className == "styled3" || inputs[a].className == "styled4") {
				select_style(inputs[a]);
			}
		}
	},
	pushed: function() {
		element = this.nextSibling;
		if(element.checked == true && element.type == "checkbox") {
			this.style.backgroundPosition = "0 -" + checkboxHeight*3 + "px";
		} else if(element.checked == true && element.type == "radio") {
			this.style.backgroundPosition = "0 -" + radioHeight*3 + "px";
		} else if(element.checked != true && element.type == "checkbox") {
			this.style.backgroundPosition = "0 -" + checkboxHeight + "px";
		} else {
			this.style.backgroundPosition = "0 -" + radioHeight + "px";
		}
		if (element.origChange) {
			element.origChange();
		}
	},
	check: function() {
		element = this.nextSibling;
		if(element.checked == true && element.type == "checkbox") {
			this.style.backgroundPosition = "0 0";
			element.checked = false;
		} else {
			if(element.type == "checkbox") {
				this.style.backgroundPosition = "0 -" + checkboxHeight*2 + "px";
			} else {
				this.style.backgroundPosition = "0 -" + radioHeight*2 + "px";
				group = this.nextSibling.name;
				inputs = document.getElementsByTagName("input");
				for(a = 0; a < inputs.length; a++) {
					if(inputs[a].name == group && inputs[a] != this.nextSibling) {
						inputs[a].previousSibling.style.backgroundPosition = "0 0";
					}
				}
			}
			element.checked = true;
		}
		if (element.origChange) {
			element.origChange();
		}
	},
	clear: function() {
		inputs = document.getElementsByTagName("input");
		for(var b = 0; b < inputs.length; b++) {
			if(inputs[b].type == "checkbox" && inputs[b].checked == true && inputs[b].className == "styled") {
				if (inputs[b].previousSibling && inputs[b].previousSibling.style!=null)
				inputs[b].previousSibling.style.backgroundPosition = "0 -" + checkboxHeight*2 + "px";
			} else if(inputs[b].type == "checkbox" && inputs[b].className == "styled") {
				if (inputs[b].previousSibling && inputs[b].previousSibling.style!=null)
				inputs[b].previousSibling.style.backgroundPosition = "0 0";
			} else if(inputs[b].type == "radio" && inputs[b].checked == true && inputs[b].className == "styled") {
				if (inputs[b].previousSibling && inputs[b].previousSibling.style!=null)
				inputs[b].previousSibling.style.backgroundPosition = "0 -" + radioHeight*2 + "px";
			} else if(inputs[b].type == "radio" && inputs[b].className == "styled") {
				if (inputs[b].previousSibling && inputs[b].previousSibling.style!=null)
				inputs[b].previousSibling.style.backgroundPosition = "0 0";
			}
		}
	},
	cfocus: function() {
		addClass(this.previousSibling,"com_focus");
		//Executa a função antiga do onfocus
		if (this.origOnfocus) {
			this.origOnfocus();
		}
	},
	cblur: function() {
		removeClass(this.previousSibling,"com_focus");
		//Executa a função antiga do onblur
		if (this.origOnblur) {
			this.origOnblur();
		}
	},
	choose: function() {
		option = this.getElementsByTagName("option");
		for(d = 0; d < option.length; d++) {		
			if(option[d].selected == true) {
				this.filho.childNodes[0].nodeValue = option[d].childNodes[0].nodeValue;
			}
		}
		//Executa a função antiga do onChange
		if (this.origOnchange) {
			this.origOnchange();
		}
	},
	sfocus: function() {
		addClass(this.filho,"com_focus");
		//Executa a função antiga do onfocus
		if (this.origOnfocus) {
			this.origOnfocus();
		}
	},
	sblur: function() {
		removeClass(this.filho,"com_focus");
		//Executa a função antiga do onblur
		if (this.origOnblur) {
			this.origOnblur();
		}
	}
}

//adiciona onload ao onload atual
var old_onload = window.onload;
if (typeof window.onload != 'function') {
	window.onload = Custom.init;
} else {
	window.onload = function() {
		if (old_onload) {
			old_onload();
		}
		Custom.init();
	}
}