/**
 * $Rev: 186 $
 * $Date: 2007-12-12 20:57:25 -0500 (Wed, 12 Dec 2007) $
 * $Id: moo.fx.js 186 2007-12-13 01:57:25Z tdowg1 $
 *
 */
/*
moo.fx, simple effects library built with prototype.js (http://prototype.conio.net).
by Valerio Proietti (http://mad4milk.net) MIT-style LICENSE.
for more info (http://moofx.mad4milk.net).
Friday, February 24, 2006
v 1.2.2
*/

var fx = new Object();
//base
fx.Base = function(){};
fx.Base.prototype = {
	setOptions: function(options) {
	this.options = {
		duration: 500,
		onComplete: '',
		transition: fx.sinoidal
	}
	Object.extend(this.options, options || {});
	},

	go: function() {
		this.startTime = (new Date).getTime();
		this.timer = setInterval (this.step.bind(this), 13);
	},

	step: function() {
		var time  = (new Date).getTime();
		if (time >= this.options.duration+this.startTime) {
			this.now = this.to;
			clearInterval (this.timer);
			this.timer = null;
			if (this.options.onComplete) setTimeout(this.options.onComplete.bind(this), 10);
		}
		else {
			var Tpos = (time - this.startTime) / (this.options.duration);
			this.now = this.options.transition(Tpos) * (this.to-this.from) + this.from;
		}
		this.increase();
	},

	custom: function(from, to) {
		if (this.timer != null) return;
		this.from = from;
		this.to = to;
		this.go();
	},

	hide: function() {
		this.now = 0;
		this.increase();
	},

	clearTimer: function() {
		clearInterval(this.timer);
		this.timer = null;
	}
}



//stretchers
fx.Layout = Class.create();
fx.Layout.prototype = Object.extend(new fx.Base(), {
	initialize: function(el, options) {
		this.el = $(el);
		this.el.style.overflow = "hidden";
		this.el.iniWidth = this.el.offsetWidth;
		this.el.iniHeight = this.el.offsetHeight;
		this.setOptions(options);
	}
});




fx.Height = Class.create();
Object.extend(Object.extend(fx.Height.prototype, fx.Layout.prototype), {
	increase: function() {
		this.el.style.height = this.now + "px";
	},

	toggle: function() {
		if (this.el.offsetHeight > 0) this.custom(this.el.offsetHeight, 0);
		else this.custom(0, this.el.scrollHeight);
	}
});
fx.Width = Class.create();
Object.extend(Object.extend(fx.Width.prototype, fx.Layout.prototype), {
	increase: function() {
		this.el.style.width = this.now + "px";
	},

	toggle: function(){
		if (this.el.offsetWidth > 0) this.custom(this.el.offsetWidth, 0);
		else this.custom(0, this.el.iniWidth);
	}
});




//fader
fx.Opacity = Class.create();
fx.Opacity.prototype = Object.extend(new fx.Base(), {
	initialize: function(el, options) {
		this.el = $(el);
		this.now = 1;
		this.increase();
		this.setOptions(options);
	},
	increase: function() {
		if (this.now == 1 && (/Firefox/.test(navigator.userAgent))) this.now = 0.9999;
		this.setOpacity(this.now);
	},
	setOpacity: function(opacity) {
		if (opacity == 0) this.el.style.visibility = "hidden";
		else this.el.style.visibility = "visible";
		if (window.ActiveXObject) this.el.style.filter = "alpha(opacity=" + opacity*100 + ")";
		this.el.style.opacity = opacity;
	},
	toggle: function() {
		if (this.now > 0) this.custom(1, 0);
		else this.custom(0, 1);
	}
});
//transitions
fx.sinoidal = function(pos){
	return ((-Math.cos(pos*Math.PI)/2) + 0.5);
	//this transition is from script.aculo.us
}
fx.linear = function(pos){
	return pos;
}
fx.cubic = function(pos){
	return Math.pow(pos, 3);
}
fx.circ = function(pos){
	return Math.sqrt(pos);
}








//composition effect: width/height/opacity
fx.Combo = Class.create();

fx.Combo.prototype = {
	setOptions: function(options) {
		this.options = {
			opacity: true,
			height: true,
			width: false
		}
		Object.extend(this.options, options || {});
	},
	initialize: function(el, options) {

		this.el = $(el);
		this.setOptions(options);
		if (this.options.opacity) {
			this.el.o = new fx.Opacity(el, options);
			options.onComplete = null;
		}
		if (this.options.height) {
			this.el.h = new fx.Height(el, options);
			options.onComplete = null;
		}
		if (this.options.width) this.el.w = new fx.Width(el, options);
	},
	toggle: function() { // alert("fx.Combo.prototype.toggle{...}... tooogling!!!!!");
		this.checkExec('toggle');
	},
	hide: function(){ this.checkExec('hide'); },
	clearTimer: function(){ this.checkExec('clearTimer'); },

	checkExec: function(func){
		if (this.el.o) this.el.o[func](); // opacity
		if (this.el.h) this.el.h[func](); // height
		if (this.el.w) this.el.w[func](); // width
	}
}