Ext.require([
    'Ext.ProgressBar'
]);

Ext.onReady(function(){
    //Please do not use the following runner code as a best practice! :)
    var Runner = function(){
        var f = function(v, pbar, btn, count, cb){
            return function(){
                if(v > count){
                    btn.dom.disabled = false;
                    cb();
                }else{
                    if(pbar.id=='pbar4'){
                        //give this one a different count style for fun
                        var i = v/count;
                        pbar.updateProgress(i, Math.round(100*i)+'% completed...');
                    }else{
                        pbar.updateProgress(v/count, 'Loading item ' + v + ' of '+count+'...');
                    }
                }
           };
        };
        return {
            run : function(pbar, btn, count, cb) {
                btn.dom.disabled = true;
                var ms = 5000/count;
                for(var i = 1; i < (count+2); i++){
                   setTimeout(f(i, pbar, btn, count, cb), i*ms);
                }
            }
        };
    }();

    //==== Progress bar 1 ====
    var pbar1 = Ext.create('Ext.ProgressBar', {
       text:'Initializing...'
    });

    var btn1 = Ext.get('btn1');
    btn1.on('click', function() {
        Ext.fly('p1text').update('Working');
        if (!pbar1.rendered) {
            pbar1.render('p1');
        } else {
            pbar1.text = 'Initializing...';
            pbar1.show();
        }
        Runner.run(pbar1, Ext.get('btn1'), 10, function() {
            pbar1.reset(true);
            Ext.fly('p1text').update('Done.').show();
        });
    });

    //==== Progress bar 2 ====
    var pbar2 = Ext.create('Ext.ProgressBar', {
        text:'Ready',
        id:'pbar2',
        cls:'left-align',
        renderTo:'p2'
    });

    var btn2 = Ext.get('btn2');

    btn2.on('click', function() {
        Runner.run(pbar2, btn2, 12, function() {
            pbar2.reset();
            pbar2.updateText('Done.');
        });
    });

    //==== Progress bar 3 ====
    var pbar3 = Ext.create('Ext.ProgressBar', {
        id:'pbar3',
        width:300,
        renderTo:'p3'
    });

    pbar3.on('update', function(val) {
        //You can handle this event at each progress interval if
        //needed to perform some other action
        Ext.fly('p3text').dom.innerHTML += '.';
    });

    var btn3 = Ext.get('btn3');

    btn3.on('click', function(){
        Ext.fly('p3text').update('Working');
        btn3.dom.disabled = true;
        pbar3.wait({
            interval: 200,
            duration: 5000,
            increment: 15,
            fn:function() {
                btn3.dom.disabled = false;
                Ext.fly('p3text').update('Done');
            }
        });
    });

    //==== Progress bar 4 ====
    var pbar4 = Ext.create('Ext.ProgressBar', {
        text:'Waiting on you...',
        id:'pbar4',
        textEl:'p4text',
        cls:'custom',
        renderTo:'p4'
    });

    var btn4 = Ext.get('btn4');

    btn4.on('click', function() {
        Runner.run(pbar4, btn4, 19, function() {
            pbar4.updateText('All finished!');
        });
    });
});
