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swipeslide.js
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swipeslide.js
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var SwipeSlide = function(container, options){
this.options = $.extend({
first: 0, // the first visible slide on initialization
visibleSlides: 1, // number of slides visible at the same time
vertical: false, // horizontal or vertical
tolerance:0.5, // values between 0 and 1, where 1 means you have to drag to the center of the slide (a value of 1 equals the ios behaviour)
delay: 0.3, // animation speed in seconds,
easing: 'ease-out', // the easing function
autoPlay: false, // false, or value in seconds to start auto slideshow
useTranslate3d: true,
bulletNavigation: 'link', // will insert bullet navigation: false, true or 'link' (event handlers will be attached)
directionalNavigation: false, // will insert previous and next links
beforeChange: null,
afterChange: null // after slide transition callback
}, options)
this.isVertical = !!this.options.vertical
this.container = $(container).addClass('ui-swipeslide').addClass('ui-swipeslide-'+(this.isVertical ? 'vertical' : 'horizontal'))
this.reel = this.container.children().first().addClass('ui-swipeslide-reel')
this.slides = this.reel.children().addClass('ui-swipeslide-slide')
this.numPages = Math.ceil(this.slides.length / this.options.visibleSlides)
this.currentPage = this.validPage(this.options.first)
this.touch = {}
this.isTouch = 'ontouchstart' in document.documentElement
this.events = {
start: this.isTouch ? 'touchstart' : 'mousedown',
move: this.isTouch ? 'touchmove' : 'mousemove',
end: this.isTouch ? 'touchend touchcancel touchleave' : 'mouseup mouseout mouseleave',
click: this.isTouch ? 'touchend' : 'click'
}
this.setup()
this.addEventListeners()
if (this.options.directionalNavigation) this.setupDirectionalNavigation()
if (this.options.bulletNavigation) this.setupBulletNavigation()
if (this.options.autoPlay) this.autoPlay()
}
SwipeSlide.prototype = {
// public
page: function(index) {
this.stopAutoPlay()
var newPage = this.validPage(index), callback
// only set callback function if a slide happend
if (this.currentPage != newPage) {
if($.isFunction(this.options.beforeChange)) this.options.beforeChange(this, this.currentPage, newPage)
this.currentPage = newPage
callback = $.proxy(this.callback, this)
} else if (this.options.autoPlay){
callback = $.proxy(this.autoPlay, this)
}
this.move(0, this.options.delay, callback)
if (this.options.bulletNavigation) this.setActiveBullet()
},
first: function(){ this.page(0) },
next: function(){ this.page(this.currentPage+1) },
prev: function(){ this.page(this.currentPage-1) },
last: function(){ this.page(this.numPages-1) },
isFirst: function(){ return this.currentPage == 0 },
isLast: function(){ return this.currentPage == this.numPages-1 },
validPage: function(num){ return Math.max(Math.min(num, this.numPages-1), 0) },
autoPlay: function(){
if (this.timeout) return false
var fn = this.isLast() ? this.first : this.next
this.timeout = setTimeout($.proxy(fn, this), this.options.autoPlay * 1000)
},
stopAutoPlay: function(){
clearTimeout(this.timeout)
delete this.timeout
},
visibleSlides: function(){
return this.slides.slice(this.currentPage, this.currentPage+this.options.visibleSlides)
},
// private
move: function(distance, delay, callback) {
this.reel.animate(this.animationProperties(distance), { duration: delay * 1000, easing: this.options.easing, complete: callback })
},
animationProperties: function(distance) {
var position = -this.currentPage * this.dimension + distance + 'px', props = {}
if (this.options.useTranslate3d) {
props['translate3d'] = (this.isVertical ? '0,'+position : position+',0') + ',0'
} else {
props[this.isVertical ? 'translateY' : 'translateX'] = position
}
return props
},
setup: function(){
var fn = this.isVertical ? 'height' : 'width'
this.dimension = this.container[fn]()
this.tolerance = this.options.tolerance * this.dimension / 2
// set height or width of reel and slides
this.reel[fn](this.dimension * this.numPages + 'px')
this.slides[fn](this.dimension / this.options.visibleSlides + 'px')
// move to first slide without animation
this.move(0,0)
},
addEventListeners: function(){
// bind listeners for touch movement
this.reel
.on(this.events.start, $.proxy(this.touchStart, this))
.on(this.events.move, $.proxy(this.touchMove, this))
.on(this.events.end, $.proxy(this.touchEnd, this))
// bind listeners to any elments with '.prev', '.next', '.first' or '.last' class
this.container
.on(this.events.click, '.next', $.proxy(this.next, this))
.on(this.events.click, '.prev', $.proxy(this.prev, this))
.on(this.events.click, '.first', $.proxy(this.first, this))
.on(this.events.click, '.last', $.proxy(this.last, this))
// recalculate dimension on window resize or orientation change
$(window).on('resize', $.proxy(this.setup, this))
},
touchStart: function(e){
this.touch.start = this.trackTouch(e)
delete this.isScroll
if (!this.isTouch) return false
},
touchMove: function(e){
if (!this.touch.start) return
this.touch.end = this.trackTouch(e)
var distance = this.distance(this.isVertical)
if (typeof this.isScroll == 'undefined') {
this.isScroll = Math.abs(distance) < Math.abs(this.distance(!this.isVertical))
}
if (!this.isScroll) {
this.stopAutoPlay()
this.move(this.withResistance(distance), 0)
return false
}
},
touchEnd: function(e){
if (!this.isScroll) {
var distance = this.distance(this.isVertical), add = 0
if (Math.abs(distance) > this.tolerance) add = distance < 0 ? 1 : -1
this.page(this.currentPage + add)
}
this.touch = {}
return false
},
trackTouch: function(e) {
var o = this.isTouch ? e.touches[0] : e
return { x: o.pageX, y: o.pageY }
},
distance: function(vertical) {
var d = vertical ? 'y' : 'x'
try { return this.touch.end[d] - this.touch.start[d] } catch(e) {return 0}
},
withResistance: function(d){
if (this.isFirst() && d > 0 || this.isLast() && d < 0) d /= (1 + Math.abs(d) / this.dimension)
return d
},
callback: function(){
// call user defined callback function with the currentPage number and an array of visible slides
if ($.isFunction(this.options.afterChange)) this.options.afterChange(this, this.currentPage)
if (this.options.autoPlay) this.autoPlay()
},
/* prev/next navigation */
setupDirectionalNavigation: function() {
this.container.append('<ul class="ui-swipeslide-nav"><li class="prev">Previous</li><li class="next">Next</li></ul>')
},
/* bullet navigation */
setupBulletNavigation: function() {
this.navBullets = $('<ul class="ui-swipeslide-bullets"></ul>')
for (i=0; i<this.numPages; i++) this.navBullets.append('<li data-index="'+i+'">'+(i+1)+'</li>')
if (this.options.bulletNavigation == 'link') {
this.navBullets.on(this.events.click, 'li', $.proxy(function(e){
this.page(parseInt($(e.currentTarget).data('index'), 10))
}, this))
}
this.container.append(this.navBullets)
this.setActiveBullet()
},
setActiveBullet: function() {
this.navBullets.children('li').removeClass('active').eq(this.currentPage).addClass('active')
}
}
var SwipeSlide3D = function(container, options) {
SwipeSlide.call(this, container, options)
this.container.addClass('ui-swipeslide-3d')
}
SwipeSlide3D.prototype = new SwipeSlide
$.extend(SwipeSlide3D.prototype, {
setup: function() {
var fn = this.isVertical ? 'height' : 'width'
this.dimension = this.container[fn]()
this.tolerance = this.options.tolerance * this.dimension / 2
this.alpha = 360/this.slides.length * (this.isVertical ? -1 : 1)
this.radius = Math.round((this.dimension/2) / Math.tan(Math.PI / this.slides.length))
this.slides.each($.proxy(this.positionSlide, this))
this.move(0,0)
},
validPage: function(num){
if (num < 0) num += this.numPages
else if (num >= this.numPages) num %= this.numPages
return num
},
animationProperties: function(distance) {
var delta = (this.alpha * distance / this.dimension) - (this.alpha * this.currentPage)
return { translate3d: '0,0,'+ -this.radius + 'px', rotate3d: this.vectorsWithDeg(delta) }
},
positionSlide: function(i, slide){
$(slide).animate({ rotate3d: this.vectorsWithDeg(i*this.alpha), translate3d: '0,0,'+this.radius+'px' }, {duration: 0})
},
vectorsWithDeg: function(degree){
return (this.isVertical ? '1,0' : '0,1') + ',0,' + degree + 'deg'
},
withResistance: function(d) {return d} // no resistance for 3d
})
// zepto plugin
;(function($) {
$.fn.swipeSlide = function(options) {
var klass = (options=options||{}).threeD ? SwipeSlide3D : SwipeSlide
return this.each(function() {
var s = new klass(this, options);
if (typeof($(this).data("swipeInstance", s).data("swipeInstance")) === "string") { $(this).removeAttr("data-swipeInstance"); }
return;
});
}
})(window.Zepto)