/*
---

script: Fx.Elements.js

description: Effect to change any number of CSS properties of any number of Elements.

license: MIT-style license

authors:
- Valerio Proietti

requires:
- core:1.2.4/Fx.CSS
- /MooTools.More

provides: [Fx.Elements]

...
*/

Fx.Elements = new Class({

    Extends: Fx.CSS,

    initialize: function(elements, options){
        this.elements = this.subject = $$(elements);
        this.parent(options);
    },

    compute: function(from, to, delta){
        var now = {};
        for (var i in from){
            var iFrom = from[i], iTo = to[i], iNow = now[i] = {};
            for (var p in iFrom) iNow[p] = this.parent(iFrom[p], iTo[p], delta);
        }
        return now;
    },

    set: function(now){
        for (var i in now){
            var iNow = now[i];
            for (var p in iNow) this.render(this.elements[i], p, iNow[p], this.options.unit);
        }
        return this;
    },

    start: function(obj){
        if (!this.check(obj)) return this;
        var from = {}, to = {};
        for (var i in obj){
            var iProps = obj[i], iFrom = from[i] = {}, iTo = to[i] = {};
            for (var p in iProps){
                var parsed = this.prepare(this.elements[i], p, iProps[p]);
                iFrom[p] = parsed.from;
                iTo[p] = parsed.to;
            }
        }
        return this.parent(from, to);
    }

});