gistfile1.js

showView : function (newViewClass, prevViewClass) {
    
    var content         = Y.one('#content'),
        newViewName     = newViewClass.NS,
        prevViewName    = prevViewClass ? prevViewClass.NS : null,
        tmp, viewContent;
    
    this.plug(newViewClass, { after: {
        contentChange : function(e){
            tmp = Y.Markout('body').div().node().hide().append(e.newVal);
        }
    }});
    
    viewContent = tmp ? tmp.get('children') : this[newViewName].get('content');
    
    function transToNewView () {
        content.get('children').remove().destroy(true);
        content.removeClass(prevViewName).addClass(newViewName);
        content.setContent(viewContent).transition('viewIn');
        if (tmp) {
            tmp.remove().destroy(true);
        }
    }
    
    if (prevViewClass) {
        content.transition('viewOut', Y.bind(function(){
            this.unplug(prevViewClass);
            transToNewView();
        }, this));
    } else {
        transToNewView();
    }
},