Function animate

test/angular/1.2/angular-animate.js:1540–1569

(animationEvent, element, className, animationComplete)

      }

      function animate(animationEvent, element, className, animationComplete) {
        //If the animateSetup function doesn't bother returning a
        //cancellation function then it means that there is no animation
        //to perform at all
        var preReflowCancellation = animateBefore(animationEvent, element, className);
        if (!preReflowCancellation) {
          clearCacheAfterReflow();
          animationComplete();
          return;
        }

        //There are two cancellation functions: one is before the first
        //reflow animation and the second is during the active state
        //animation. The first function will take care of removing the
        //data from the element which will not make the 2nd animation
        //happen in the first place
        var cancel = preReflowCancellation;
        afterReflow(element, function() {
          unblockTransitions(element, className);
          unblockKeyframeAnimations(element);
          //once the reflow is complete then we point cancel to
          //the new cancellation function which will remove all of the
          //animation properties from the active animation
          cancel = animateAfter(animationEvent, element, className, animationComplete);
        });

        return function(cancelled) {
          (cancel || noop)(cancelled);
        };
      }

      function animateClose(element, className) {
        element.removeClass(className);