Progress bar class for MooTools

progress.example.js

// Live example - http://jsfiddle.net/Wolfy87/KJtdB/

var bar = new Progress({
    element: $('bar'),
    progress: 20
});

setTimeout(function() {
    bar.setProgress(45);
    
    setTimeout(function() {
        bar.setProgress(78);
        
        setTimeout(function() {
            bar.setProgress(100);
        }, 1400);
    }, 500);
}, 800);

progress.js

var Progress = new Class({
    Implements: [Options, Events],
    options: {
        element: null,
        progress: 0,
        property: 'width',
        unit: '%',
        duration: 500
    },
    initialize: function(options) {
        this.setOptions(options);
        
        // Set up the tween
        this.tween = new Fx.Tween(options.element, {
            property: this.options.property,
            unit: this.options.unit,
            link: 'cancel',
            duration: this.options.duration
        });
        
        // Set the initial progress
        this.setProgress(this.options.progress, true);
    },
    setProgress: function(progress, instant) {
        // Set the progress either instantly or with an animation
        if(instant) {
            this.options.element.setStyle(this.options.property, progress + this.options.unit);
        }
        else {
            this.tween.start(this.options.progress, progress);
        }
        
        // Update the current progress
        this.options.progress = progress;
        
        this.fireEvent('progress', progress);
    },
    getProgress: function() {
        return this.options.progress;
    }
});

progress.min.js

var Progress=new Class({Implements:[Options,Events],options:{element:null,progress:0,property:"width",unit:"%",duration:500},initialize:function(a){this.setOptions(a);this.tween=new Fx.Tween(a.element,{property:this.options.property,unit:this.options.unit,link:"cancel",duration:this.options.duration});this.setProgress(this.options.progress,!0)},setProgress:function(a,b){b?this.options.element.setStyle(this.options.property,a+this.options.unit):this.tween.start(this.options.progress,a);this.options.progress=
a;this.fireEvent("progress",a)},getProgress:function(){return this.options.progress}});