function Swipe(container, options) {
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"use strict";
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// utilities
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var noop = function() {}; // simple no operation function
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var offloadFn = function(fn) { setTimeout(fn || noop, 0) }; // offload a functions execution
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// check browser capabilities
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var browser = {
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addEventListener: !!window.addEventListener,
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touch: ('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch,
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transitions: (function(temp) {
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var props = ['transitionProperty', 'WebkitTransition', 'MozTransition', 'OTransition', 'msTransition'];
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for ( var i in props ) if (temp.style[ props[i] ] !== undefined) return true;
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return false;
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})(document.createElement('swipe'))
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};
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// quit if no root element
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if (!container) return;
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var element = container.children[0];
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var slides, slidePos, width, length;
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options = options || {};
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var index = parseInt(options.startSlide, 10) || 0;
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var speed = options.speed || 300;
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options.continuous = options.continuous !== undefined ? options.continuous : true;
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function setup() {
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// cache slides
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slides = element.children;
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length = slides.length;
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// set continuous to false if only one slide
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if (slides.length < 2) options.continuous = false;
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//special case if two slides
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if (browser.transitions && options.continuous && slides.length < 3) {
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element.appendChild(slides[0].cloneNode(true));
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element.appendChild(element.children[1].cloneNode(true));
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slides = element.children;
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}
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// create an array to store current positions of each slide
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slidePos = new Array(slides.length);
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// determine width of each slide
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width = container.getBoundingClientRect().width || container.offsetWidth;
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element.style.width = (slides.length * width) + 'px';
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// stack elements
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var pos = slides.length;
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while(pos--) {
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var slide = slides[pos];
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slide.style.width = width + 'px';
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slide.setAttribute('data-index', pos);
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if (browser.transitions) {
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slide.style.left = (pos * -width) + 'px';
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move(pos, index > pos ? -width : (index < pos ? width : 0), 0);
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}
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}
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// reposition elements before and after index
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if (options.continuous && browser.transitions) {
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move(circle(index-1), -width, 0);
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move(circle(index+1), width, 0);
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}
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if (!browser.transitions) element.style.left = (index * -width) + 'px';
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container.style.visibility = 'visible';
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}
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function prev() {
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if (options.continuous) slide(index-1);
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else if (index) slide(index-1);
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}
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function next() {
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if (options.continuous) slide(index+1);
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else if (index < slides.length - 1) slide(index+1);
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}
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function circle(index) {
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// a simple positive modulo using slides.length
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return (slides.length + (index % slides.length)) % slides.length;
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}
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function slide(to, slideSpeed) {
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// do nothing if already on requested slide
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if (index == to) return;
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if (browser.transitions) {
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var direction = Math.abs(index-to) / (index-to); // 1: backward, -1: forward
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// get the actual position of the slide
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if (options.continuous) {
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var natural_direction = direction;
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direction = -slidePos[circle(to)] / width;
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// if going forward but to < index, use to = slides.length + to
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// if going backward but to > index, use to = -slides.length + to
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if (direction !== natural_direction) to = -direction * slides.length + to;
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}
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var diff = Math.abs(index-to) - 1;
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// move all the slides between index and to in the right direction
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while (diff--) move( circle((to > index ? to : index) - diff - 1), width * direction, 0);
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to = circle(to);
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move(index, width * direction, slideSpeed || speed);
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move(to, 0, slideSpeed || speed);
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if (options.continuous) move(circle(to - direction), -(width * direction), 0); // we need to get the next in place
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} else {
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to = circle(to);
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animate(index * -width, to * -width, slideSpeed || speed);
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//no fallback for a circular continuous if the browser does not accept transitions
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}
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index = to;
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offloadFn(options.callback && options.callback(index, slides[index]));
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}
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function move(index, dist, speed) {
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translate(index, dist, speed);
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slidePos[index] = dist;
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}
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function translate(index, dist, speed) {
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var slide = slides[index];
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var style = slide && slide.style;
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if (!style) return;
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style.webkitTransitionDuration =
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style.MozTransitionDuration =
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style.msTransitionDuration =
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style.OTransitionDuration =
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style.transitionDuration = speed + 'ms';
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style.webkitTransform = 'translate(' + dist + 'px,0)' + 'translateZ(0)';
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style.msTransform =
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style.MozTransform =
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style.OTransform = 'translateX(' + dist + 'px)';
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}
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function animate(from, to, speed) {
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// if not an animation, just reposition
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if (!speed) {
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element.style.left = to + 'px';
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return;
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}
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var start = +new Date;
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var timer = setInterval(function() {
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var timeElap = +new Date - start;
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if (timeElap > speed) {
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element.style.left = to + 'px';
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if (delay) begin();
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options.transitionEnd && options.transitionEnd.call(event, index, slides[index]);
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clearInterval(timer);
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return;
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}
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element.style.left = (( (to - from) * (Math.floor((timeElap / speed) * 100) / 100) ) + from) + 'px';
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}, 4);
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}
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// setup auto slideshow
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var delay = options.auto || 0;
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var interval;
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function begin() {
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interval = setTimeout(next, delay);
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}
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function stop() {
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delay = 0;
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clearTimeout(interval);
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}
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// setup initial vars
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var start = {};
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var delta = {};
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var isScrolling;
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// setup event capturing
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var events = {
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handleEvent: function(event) {
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switch (event.type) {
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case 'touchstart': this.start(event); break;
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case 'touchmove': this.move(event); break;
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case 'touchend': offloadFn(this.end(event)); break;
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case 'webkitTransitionEnd':
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case 'msTransitionEnd':
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case 'oTransitionEnd':
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case 'otransitionend':
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case 'transitionend': offloadFn(this.transitionEnd(event)); break;
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case 'resize': offloadFn(setup); break;
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}
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if (options.stopPropagation) event.stopPropagation();
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},
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start: function(event) {
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var touches = event.touches[0];
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// measure start values
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start = {
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// get initial touch coords
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x: touches.pageX,
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y: touches.pageY,
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// store time to determine touch duration
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time: +new Date
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};
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// used for testing first move event
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isScrolling = undefined;
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// reset delta and end measurements
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delta = {};
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// attach touchmove and touchend listeners
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element.addEventListener('touchmove', this, false);
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element.addEventListener('touchend', this, false);
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},
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move: function(event) {
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// ensure swiping with one touch and not pinching
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if ( event.touches.length > 1 || event.scale && event.scale !== 1) return
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if (options.disableScroll) event.preventDefault();
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var touches = event.touches[0];
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// measure change in x and y
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delta = {
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x: touches.pageX - start.x,
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y: touches.pageY - start.y
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}
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// determine if scrolling test has run - one time test
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if ( typeof isScrolling == 'undefined') {
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isScrolling = !!( isScrolling || Math.abs(delta.x) < Math.abs(delta.y) );
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}
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// if user is not trying to scroll vertically
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if (!isScrolling) {
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// prevent native scrolling
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event.preventDefault();
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// stop slideshow
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stop();
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// increase resistance if first or last slide
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if (options.continuous) { // we don't add resistance at the end
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translate(circle(index-1), delta.x + slidePos[circle(index-1)], 0);
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translate(index, delta.x + slidePos[index], 0);
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translate(circle(index+1), delta.x + slidePos[circle(index+1)], 0);
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} else {
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delta.x =
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delta.x /
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( (!index && delta.x > 0 // if first slide and sliding left
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|| index == slides.length - 1 // or if last slide and sliding right
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&& delta.x < 0 // and if sliding at all
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) ?
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( Math.abs(delta.x) / width + 1 ) // determine resistance level
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: 1 ); // no resistance if false
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// translate 1:1
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translate(index-1, delta.x + slidePos[index-1], 0);
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translate(index, delta.x + slidePos[index], 0);
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translate(index+1, delta.x + slidePos[index+1], 0);
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}
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}
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},
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end: function(event) {
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// measure duration
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var duration = +new Date - start.time;
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// determine if slide attempt triggers next/prev slide
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var isValidSlide =
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Number(duration) < 250 // if slide duration is less than 250ms
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&& Math.abs(delta.x) > 20 // and if slide amt is greater than 20px
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|| Math.abs(delta.x) > width/2; // or if slide amt is greater than half the width
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// determine if slide attempt is past start and end
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var isPastBounds =
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!index && delta.x > 0 // if first slide and slide amt is greater than 0
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|| index == slides.length - 1 && delta.x < 0; // or if last slide and slide amt is less than 0
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if (options.continuous) isPastBounds = false;
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// determine direction of swipe (true:right, false:left)
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var direction = delta.x < 0;
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// if not scrolling vertically
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if (!isScrolling) {
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if (isValidSlide && !isPastBounds) {
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if (direction) {
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if (options.continuous) { // we need to get the next in this direction in place
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move(circle(index-1), -width, 0);
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move(circle(index+2), width, 0);
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} else {
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move(index-1, -width, 0);
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}
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move(index, slidePos[index]-width, speed);
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move(circle(index+1), slidePos[circle(index+1)]-width, speed);
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index = circle(index+1);
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} else {
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if (options.continuous) { // we need to get the next in this direction in place
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move(circle(index+1), width, 0);
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move(circle(index-2), -width, 0);
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} else {
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move(index+1, width, 0);
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}
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move(index, slidePos[index]+width, speed);
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move(circle(index-1), slidePos[circle(index-1)]+width, speed);
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index = circle(index-1);
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}
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options.callback && options.callback(index, slides[index]);
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} else {
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if (options.continuous) {
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move(circle(index-1), -width, speed);
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move(index, 0, speed);
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move(circle(index+1), width, speed);
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} else {
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move(index-1, -width, speed);
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move(index, 0, speed);
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move(index+1, width, speed);
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}
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}
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}
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// kill touchmove and touchend event listeners until touchstart called again
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element.removeEventListener('touchmove', events, false)
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element.removeEventListener('touchend', events, false)
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},
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transitionEnd: function(event) {
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if (parseInt(event.target.getAttribute('data-index'), 10) == index) {
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if (delay) begin();
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options.transitionEnd && options.transitionEnd.call(event, index, slides[index]);
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}
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}
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}
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// trigger setup
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setup();
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// start auto slideshow if applicable
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if (delay) begin();
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// add event listeners
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if (browser.addEventListener) {
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// set touchstart event on element
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if (browser.touch) element.addEventListener('touchstart', events, false);
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if (browser.transitions) {
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element.addEventListener('webkitTransitionEnd', events, false);
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element.addEventListener('msTransitionEnd', events, false);
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element.addEventListener('oTransitionEnd', events, false);
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element.addEventListener('otransitionend', events, false);
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element.addEventListener('transitionend', events, false);
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}
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// set resize event on window
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window.addEventListener('resize', events, false);
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} else {
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window.onresize = function () { setup() }; // to play nice with old IE
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}
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// expose the Swipe API
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return {
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setup: function() {
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setup();
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},
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slide: function(to, speed) {
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// cancel slideshow
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stop();
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slide(to, speed);
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},
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prev: function() {
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// cancel slideshow
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stop();
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prev();
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},
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next: function() {
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// cancel slideshow
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stop();
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next();
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},
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stop: function() {
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// cancel slideshow
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stop();
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},
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getPos: function() {
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// return current index position
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return index;
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},
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getNumSlides: function() {
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// return total number of slides
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return length;
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},
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kill: function() {
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// cancel slideshow
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stop();
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// reset element
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element.style.width = '';
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element.style.left = '';
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// reset slides
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var pos = slides.length;
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while(pos--) {
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var slide = slides[pos];
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slide.style.width = '';
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slide.style.left = '';
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if (browser.transitions) translate(pos, 0, 0);
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}
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// removed event listeners
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if (browser.addEventListener) {
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// remove current event listeners
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element.removeEventListener('touchstart', events, false);
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element.removeEventListener('webkitTransitionEnd', events, false);
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element.removeEventListener('msTransitionEnd', events, false);
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element.removeEventListener('oTransitionEnd', events, false);
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element.removeEventListener('otransitionend', events, false);
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element.removeEventListener('transitionend', events, false);
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window.removeEventListener('resize', events, false);
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}
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else {
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window.onresize = null;
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}
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}
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}
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}
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if ( window.jQuery || window.Zepto ) {
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(function($) {
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$.fn.Swipe = function(params) {
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return this.each(function() {
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$(this).data('Swipe', new Swipe($(this)[0], params));
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});
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}
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})( window.jQuery || window.Zepto )
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}
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