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/* ----------------------------------
* SLIDER v1.0.1
* Licensed under The MIT License
* Adapted from Brad Birdsall's swipe
* http://opensource.org/licenses/MIT
* ---------------------------------- */
!function () {
var pageX;
var pageY;
var slider;
var deltaX;
var deltaY;
var offsetX;
var lastSlide;
var startTime;
var resistance;
var sliderWidth;
var slideNumber;
var isScrolling;
var scrollableArea;
var getSlider = function (target) {
var i, sliders = document.querySelectorAll('.slider > .slide-group');
for (; target && target !== document; target = target.parentNode) {
for (i = sliders.length; i--;) { if (sliders[i] === target) return target; }
}
}
var getScroll = function () {
var translate3d = slider.style.webkitTransform.match(/translate3d\(([^,]*)/);
return parseInt(translate3d ? translate3d[1] : 0)
};
var setSlideNumber = function (offset) {
var round = offset ? (deltaX < 0 ? 'ceil' : 'floor') : 'round';
slideNumber = Math[round](getScroll() / ( scrollableArea / slider.children.length) );
slideNumber += offset;
slideNumber = Math.min(slideNumber, 0);
slideNumber = Math.max(-(slider.children.length - 1), slideNumber);
}
var onTouchStart = function (e) {
slider = getSlider(e.target);
if (!slider) return;
var firstItem = slider.querySelector('.slide');
scrollableArea = firstItem.offsetWidth * slider.children.length;
isScrolling = undefined;
sliderWidth = slider.offsetWidth;
resistance = 1;
lastSlide = -(slider.children.length - 1);
startTime = +new Date;
pageX = e.touches[0].pageX;
pageY = e.touches[0].pageY;
deltaX = 0;
deltaY = 0;
setSlideNumber(0);
slider.style['-webkit-transition-duration'] = 0;
};
var onTouchMove = function (e) {
if (e.touches.length > 1 || !slider) return; // Exit if a pinch || no slider
deltaX = e.touches[0].pageX - pageX;
deltaY = e.touches[0].pageY - pageY;
pageX = e.touches[0].pageX;
pageY = e.touches[0].pageY;
if (typeof isScrolling == 'undefined') {
isScrolling = Math.abs(deltaY) > Math.abs(deltaX);
}
if (isScrolling) return;
offsetX = (deltaX / resistance) + getScroll();
e.preventDefault();
resistance = slideNumber == 0 && deltaX > 0 ? (pageX / sliderWidth) + 1.25 :
slideNumber == lastSlide && deltaX < 0 ? (Math.abs(pageX) / sliderWidth) + 1.25 : 1;
slider.style.webkitTransform = 'translate3d(' + offsetX + 'px,0,0)';
};
var onTouchEnd = function (e) {
if (!slider || isScrolling) return;
setSlideNumber(
(+new Date) - startTime < 1000 && Math.abs(deltaX) > 15 ? (deltaX < 0 ? -1 : 1) : 0
);
offsetX = slideNumber * sliderWidth;
slider.style['-webkit-transition-duration'] = '.2s';
slider.style.webkitTransform = 'translate3d(' + offsetX + 'px,0,0)';
e = new CustomEvent('slide', {
detail: { slideNumber: Math.abs(slideNumber) },
bubbles: true,
cancelable: true
});
slider.parentNode.dispatchEvent(e);
};
window.addEventListener('touchstart', onTouchStart);
window.addEventListener('touchmove', onTouchMove);
window.addEventListener('touchend', onTouchEnd);
}();
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