Function bindTouchEvents

core/deck.core.js:207–258

()

  };

  var bindTouchEvents = function() {
    var startTouch;
    var direction = options.touch.swipeDirection;
    var tolerance = options.touch.swipeTolerance;
    var listenToHorizontal = ({ both: true, horizontal: true })[direction];
    var listenToVertical = ({ both: true, vertical: true })[direction];

    $container.unbind('touchstart.deck');
    $container.bind('touchstart.deck', function(event) {
      if (!startTouch) {
        startTouch = $.extend({}, event.originalEvent.targetTouches[0]);
      }
    });

    $container.unbind('touchmove.deck');
    $container.bind('touchmove.deck', function(event) {
      $.each(event.originalEvent.changedTouches, function(i, touch) {
        if (!startTouch || touch.identifier !== startTouch.identifier) {
          return true;
        }
        var xDistance = touch.screenX - startTouch.screenX;
        var yDistance = touch.screenY - startTouch.screenY;
        var leftToRight = xDistance > tolerance && listenToHorizontal;
        var rightToLeft = xDistance < -tolerance && listenToHorizontal;
        var topToBottom = yDistance > tolerance && listenToVertical;
        var bottomToTop = yDistance < -tolerance && listenToVertical;

        if (leftToRight || topToBottom) {
          $.deck('prev');
          startTouch = undefined;
        }
        else if (rightToLeft || bottomToTop) {
          $.deck('next');
          startTouch = undefined;
        }
        return false;
      });

      if (listenToVertical) {
        event.preventDefault();
      }
    });

    $container.unbind('touchend.deck');
    $container.bind('touchend.deck', function(event) {
      $.each(event.originalEvent.changedTouches, function(i, touch) {
        if (startTouch && touch.identifier === startTouch.identifier) {
          startTouch = undefined;
        }
      });
    });
  };

  var indexInBounds = function(index) {
    return typeof index === 'number' && index >=0 && index < slides.length;