lubuntu.me/plugins/so-widgets-bundle/js/jquery.cycle.swipe.js

/*! swipe plugin for Cycle2;  version: 20121120 */
(function($) {
    "use strict";

// this script adds support for touch events.  the logic is lifted from jQuery Mobile.
// if you have jQuery Mobile installed, you do NOT need this script

    var supportTouch = 'ontouchend' in document;

    $.event.special.swipe = $.event.special.swipe || {
        scrollSupressionThreshold: 10,   // More than this horizontal displacement, and we will suppress scrolling.
        durationThreshold: 1000,         // More time than this, and it isn't a swipe.
        horizontalDistanceThreshold: 30, // Swipe horizontal displacement must be more than this.
        verticalDistanceThreshold: 75,   // Swipe vertical displacement must be less than this.

        setup: function() {
            var $this = $( this );

            $this.bind( 'touchstart', function( event ) {
                var data = event.originalEvent.touches ? event.originalEvent.touches[ 0 ] : event;
                var stop, start = {
                    time: ( new Date() ).getTime(),
                    coords: [ data.pageX, data.pageY ],
                    origin: $( event.target )
                };

                function moveHandler( event ) {
                    if ( !start )
                        return;

                    var data = event.originalEvent.touches ? event.originalEvent.touches[ 0 ] : event;

                    stop = {
                        time: ( new Date() ).getTime(),
                        coords: [ data.pageX, data.pageY ]
                    };

                    // prevent scrolling
                    if ( Math.abs( start.coords[ 0 ] - stop.coords[ 0 ] ) > $.event.special.swipe.scrollSupressionThreshold ) {
                        event.preventDefault();
                    }
                }

                $this.bind( 'touchmove', moveHandler )
                    .one( 'touchend', function( event ) {
                        $this.unbind( 'touchmove', moveHandler );

                        if ( start && stop ) {
                            if ( stop.time - start.time < $.event.special.swipe.durationThreshold &&
                                Math.abs( start.coords[ 0 ] - stop.coords[ 0 ] ) > $.event.special.swipe.horizontalDistanceThreshold &&
                                Math.abs( start.coords[ 1 ] - stop.coords[ 1 ] ) < $.event.special.swipe.verticalDistanceThreshold ) {

                                start.origin.trigger( "swipe" )
                                    .trigger( start.coords[0] > stop.coords[ 0 ] ? "swipeleft" : "swiperight" );
                            }
                        }
                        start = stop = undefined;
                    });
            });
        }
    };

    $.event.special.swipeleft = $.event.special.swipeleft || {
        setup: function() {
            $( this ).bind( 'swipe', $.noop );
        }
    };
    $.event.special.swiperight = $.event.special.swiperight || $.event.special.swipeleft;

})(jQuery);