ZK Client Widget support swipe event for tablet/mobile device

doSwipe_: function(evt) {
    var opts = evt.opts, dir = opts.dir;
    switch (dir) {
    case 'left': doSwipeLeft(); break;
    case 'right': doSwipeRight(); break;
    case 'up': doSwipeUp(); break;
    case 'down': doSwipeDown(); break;
    }
}