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//(c) 2006 Valerio Proietti (http://mad4milk.net). MIT-style license.
//moo.fx.js - depends on prototype.js OR prototype.lite.js
//version 2.0
var Fx = fx = {};
Fx.Base = function(){};
Fx.Base.prototype = {
setOptions: function(options){
this.options = Object.extend({
onStart: function(){},
onComplete: function(){},
transition: Fx.Transitions.sineInOut,
duration: 500,
unit: 'px',
wait: true,
fps: 50
}, options || {});
},
step: function(){
var time = new Date().getTime();
if (time < this.time + this.options.duration){
this.cTime = time - this.time;
this.setNow();
} else {
setTimeout(this.options.onComplete.bind(this, this.element), 10);
this.clearTimer();
this.now = this.to;
}
this.increase();
},
setNow: function(){
this.now = this.compute(this.from, this.to);
},
compute: function(from, to){
var change = to - from;
return this.options.transition(this.cTime, from, change, this.options.duration);
},
clearTimer: function(){
clearInterval(this.timer);
this.timer = null;
return this;
},
_start: function(from, to){
if (!this.options.wait) this.clearTimer();
if (this.timer) return;
setTimeout(this.options.onStart.bind(this, this.element), 10);
this.from = from;
this.to = to;
this.time = new Date().getTime();
this.timer = setInterval(this.step.bind(this), Math.round(1000/this.options.fps));
return this;
},
custom: function(from, to){
return this._start(from, to);
},
set: function(to){
this.now = to;
this.increase();
return this;
},
hide: function(){
return this.set(0);
},
setStyle: function(e, p, v){
if (p == 'opacity'){
if (v == 0 && e.style.visibility != "hidden") e.style.visibility = "hidden";
else if (e.style.visibility != "visible") e.style.visibility = "visible";
if (window.ActiveXObject) e.style.filter = "alpha(opacity=" + v*100 + ")";
e.style.opacity = v;
} else e.style[p] = v+this.options.unit;
}
};
Fx.Style = Class.create();
Fx.Style.prototype = Object.extend(new Fx.Base(), {
initialize: function(el, property, options){
this.element = $(el);
this.setOptions(options);
this.property = property.camelize();
},
increase: function(){
this.setStyle(this.element, this.property, this.now);
}
});
Fx.Styles = Class.create();
Fx.Styles.prototype = Object.extend(new Fx.Base(), {
initialize: function(el, options){
this.element = $(el);
this.setOptions(options);
this.now = {};
},
setNow: function(){
for (p in this.from) this.now[p] = this.compute(this.from[p], this.to[p]);
},
custom: function(obj){
if (this.timer && this.options.wait) return;
var from = {};
var to = {};
for (p in obj){
from[p] = obj[p][0];
to[p] = obj[p][1];
}
return this._start(from, to);
},
increase: function(){
for (var p in this.now) this.setStyle(this.element, p, this.now[p]);
}
});
//Transitions (c) 2003 Robert Penner (http://www.robertpenner.com/easing/), BSD License.
Fx.Transitions = {
linear: function(t, b, c, d) { return c*t/d + b; },
sineInOut: function(t, b, c, d) { return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b; }
};
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