in _includes/scripts/lib/swiper.js [147:156]
function handleTouchend() {
touching = false;
var deltaX = translateX - preTranslateX;
var distance = deltaX + velocityX * rootWidth;
if (Math.abs(distance) > rootWidth / 2) {
distance > 0 ? move('prev') : move('next');
} else {
move('cur');
}
}