Formerly Fx.Style, effect to transition any CSS property for an element.
Fx.Tween = new Class({
Extends: Fx.CSS,
initialize: function(element, options){
this.element = this.subject = document.id(element);
this.parent(options);
},
set: function(property, now){
if (arguments.length == 1){
now = property;
property = this.property || this.options.property;
}
this.render(this.element, property, now, this.options.unit);
return this;
},
start: function(property, from, to){
if (!this.check(property, from, to)) return this;
var args = Array.flatten(arguments);
this.property = this.options.property || args.shift();
var parsed = this.prepare(this.element, this.property, args);
return this.parent(parsed.from, parsed.to);
}
});
Element.Properties.tween = {
set: function(options){
this.get('tween').cancel().setOptions(options);
return this;
},
get: function(){
var tween = this.retrieve('tween');
if (!tween){
tween = new Fx.Tween(this, {link: 'cancel'});
this.store('tween', tween);
}
return tween;
}
};
Element.implement({
tween: function(property, from, to){
this.get('tween').start(arguments);
return this;
},
fade: function(how){
var fade = this.get('tween'), o = 'opacity', toggle;
how = [how, 'toggle'].pick();
switch (how){
case 'in': fade.start(o, 1); break;
case 'out': fade.start(o, 0); break;
case 'show': fade.set(o, 1); break;
case 'hide': fade.set(o, 0); break;
case 'toggle':
var flag = this.retrieve('fade:flag', this.get('opacity') == 1);
fade.start(o, (flag) ? 0 : 1);
this.store('fade:flag', !flag);
toggle = true;
break;
default: fade.start(o, arguments);
}
if (!toggle) this.eliminate('fade:flag');
return this;
},
highlight: function(start, end){
if (!end){
end = this.retrieve('highlight:original', this.getStyle('background-color'));
end = (end == 'transparent') ? '#fff' : end;
}
var tween = this.get('tween');
tween.start('background-color', start || '#ffff88', end).chain(function(){
this.setStyle('background-color', this.retrieve('highlight:original'));
tween.callChain();
}.bind(this));
return this;
}
});