Click while element isEnabled in protractor

I have to click a right arrow button while is enabled on the page.

This is my code:

  var sig = element(by.xpath("//*[@id='WidgetELearning-inner-auto']/div/div/div[1]/div/div/div[2]/div/button[2]/i"));
    sig.isEnabled().then(function (result) {

        while (result) {
            sig.click();
            return sig;
        }

It only clicks two times, and I need clicking while element is enabled. How can I do?