791 lines
23 KiB
JavaScript
791 lines
23 KiB
JavaScript
// import supportsPassive from '../../../_util/supportsPassive';
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export function clamp(number, lowerBound, upperBound) {
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return Math.max(lowerBound, Math.min(number, upperBound));
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}
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export const safePreventDefault = event => {
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const passiveEvents = ['touchstart', 'touchmove', 'wheel'];
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if (!passiveEvents.includes(event.type)) {
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event.preventDefault();
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}
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};
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export const getOnDemandLazySlides = spec => {
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const onDemandSlides = [];
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const startIndex = lazyStartIndex(spec);
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const endIndex = lazyEndIndex(spec);
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for (let slideIndex = startIndex; slideIndex < endIndex; slideIndex++) {
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if (spec.lazyLoadedList.indexOf(slideIndex) < 0) {
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onDemandSlides.push(slideIndex);
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}
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}
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return onDemandSlides;
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};
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// return list of slides that need to be present
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export const getRequiredLazySlides = spec => {
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const requiredSlides = [];
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const startIndex = lazyStartIndex(spec);
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const endIndex = lazyEndIndex(spec);
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for (let slideIndex = startIndex; slideIndex < endIndex; slideIndex++) {
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requiredSlides.push(slideIndex);
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}
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return requiredSlides;
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};
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// startIndex that needs to be present
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export const lazyStartIndex = spec => spec.currentSlide - lazySlidesOnLeft(spec);
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export const lazyEndIndex = spec => spec.currentSlide + lazySlidesOnRight(spec);
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export const lazySlidesOnLeft = spec =>
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spec.centerMode
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? Math.floor(spec.slidesToShow / 2) + (parseInt(spec.centerPadding) > 0 ? 1 : 0)
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: 0;
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export const lazySlidesOnRight = spec =>
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spec.centerMode
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? Math.floor((spec.slidesToShow - 1) / 2) + 1 + (parseInt(spec.centerPadding) > 0 ? 1 : 0)
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: spec.slidesToShow;
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// get width of an element
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export const getWidth = elem => (elem && elem.offsetWidth) || 0;
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export const getHeight = elem => (elem && elem.offsetHeight) || 0;
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export const getSwipeDirection = (touchObject, verticalSwiping = false) => {
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let swipeAngle;
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const xDist = touchObject.startX - touchObject.curX;
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const yDist = touchObject.startY - touchObject.curY;
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const r = Math.atan2(yDist, xDist);
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swipeAngle = Math.round((r * 180) / Math.PI);
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if (swipeAngle < 0) {
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swipeAngle = 360 - Math.abs(swipeAngle);
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}
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if ((swipeAngle <= 45 && swipeAngle >= 0) || (swipeAngle <= 360 && swipeAngle >= 315)) {
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return 'left';
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}
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if (swipeAngle >= 135 && swipeAngle <= 225) {
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return 'right';
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}
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if (verticalSwiping === true) {
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if (swipeAngle >= 35 && swipeAngle <= 135) {
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return 'up';
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} else {
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return 'down';
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}
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}
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return 'vertical';
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};
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// whether or not we can go next
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export const canGoNext = spec => {
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let canGo = true;
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if (!spec.infinite) {
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if (spec.centerMode && spec.currentSlide >= spec.slideCount - 1) {
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canGo = false;
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} else if (
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spec.slideCount <= spec.slidesToShow ||
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spec.currentSlide >= spec.slideCount - spec.slidesToShow
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) {
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canGo = false;
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}
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}
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return canGo;
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};
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// given an object and a list of keys, return new object with given keys
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export const extractObject = (spec, keys) => {
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const newObject = {};
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keys.forEach(key => (newObject[key] = spec[key]));
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return newObject;
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};
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// get initialized state
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export const initializedState = spec => {
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// spec also contains listRef, trackRef
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const slideCount = spec.children.length;
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const listNode = spec.listRef;
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const listWidth = Math.ceil(getWidth(listNode));
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const trackNode = spec.trackRef;
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const trackWidth = Math.ceil(getWidth(trackNode));
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let slideWidth;
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if (!spec.vertical) {
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let centerPaddingAdj = spec.centerMode && parseInt(spec.centerPadding) * 2;
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if (typeof spec.centerPadding === 'string' && spec.centerPadding.slice(-1) === '%') {
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centerPaddingAdj *= listWidth / 100;
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}
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slideWidth = Math.ceil((listWidth - centerPaddingAdj) / spec.slidesToShow);
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} else {
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slideWidth = listWidth;
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}
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const slideHeight = listNode && getHeight(listNode.querySelector('[data-index="0"]'));
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const listHeight = slideHeight * spec.slidesToShow;
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let currentSlide = spec.currentSlide === undefined ? spec.initialSlide : spec.currentSlide;
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if (spec.rtl && spec.currentSlide === undefined) {
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currentSlide = slideCount - 1 - spec.initialSlide;
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}
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let lazyLoadedList = spec.lazyLoadedList || [];
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const slidesToLoad = getOnDemandLazySlides({ ...spec, currentSlide, lazyLoadedList }, spec);
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lazyLoadedList = lazyLoadedList.concat(slidesToLoad);
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const state = {
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slideCount,
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slideWidth,
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listWidth,
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trackWidth,
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currentSlide,
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slideHeight,
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listHeight,
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lazyLoadedList,
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};
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if (spec.autoplaying === null && spec.autoplay) {
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state['autoplaying'] = 'playing';
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}
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return state;
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};
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export const slideHandler = spec => {
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const {
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waitForAnimate,
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animating,
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fade,
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infinite,
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index,
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slideCount,
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lazyLoad,
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currentSlide,
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centerMode,
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slidesToScroll,
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slidesToShow,
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useCSS,
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} = spec;
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let { lazyLoadedList } = spec;
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if (waitForAnimate && animating) return {};
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let animationSlide = index;
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let finalSlide;
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let animationLeft;
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let finalLeft;
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let state = {};
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let nextState = {};
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const targetSlide = infinite ? index : clamp(index, 0, slideCount - 1);
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if (fade) {
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if (!infinite && (index < 0 || index >= slideCount)) return {};
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if (index < 0) {
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animationSlide = index + slideCount;
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} else if (index >= slideCount) {
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animationSlide = index - slideCount;
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}
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if (lazyLoad && lazyLoadedList.indexOf(animationSlide) < 0) {
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lazyLoadedList = lazyLoadedList.concat(animationSlide);
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}
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state = {
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animating: true,
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currentSlide: animationSlide,
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lazyLoadedList,
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targetSlide: animationSlide,
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};
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nextState = { animating: false, targetSlide: animationSlide };
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} else {
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finalSlide = animationSlide;
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if (animationSlide < 0) {
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finalSlide = animationSlide + slideCount;
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if (!infinite) finalSlide = 0;
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else if (slideCount % slidesToScroll !== 0) {
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finalSlide = slideCount - (slideCount % slidesToScroll);
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}
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} else if (!canGoNext(spec) && animationSlide > currentSlide) {
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animationSlide = finalSlide = currentSlide;
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} else if (centerMode && animationSlide >= slideCount) {
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animationSlide = infinite ? slideCount : slideCount - 1;
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finalSlide = infinite ? 0 : slideCount - 1;
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} else if (animationSlide >= slideCount) {
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finalSlide = animationSlide - slideCount;
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if (!infinite) finalSlide = slideCount - slidesToShow;
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else if (slideCount % slidesToScroll !== 0) finalSlide = 0;
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}
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if (!infinite && animationSlide + slidesToShow >= slideCount) {
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finalSlide = slideCount - slidesToShow;
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}
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animationLeft = getTrackLeft({ ...spec, slideIndex: animationSlide });
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finalLeft = getTrackLeft({ ...spec, slideIndex: finalSlide });
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if (!infinite) {
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if (animationLeft === finalLeft) animationSlide = finalSlide;
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animationLeft = finalLeft;
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}
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if (lazyLoad) {
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lazyLoadedList = lazyLoadedList.concat(
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getOnDemandLazySlides({ ...spec, currentSlide: animationSlide }),
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);
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}
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if (!useCSS) {
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state = {
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currentSlide: finalSlide,
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trackStyle: getTrackCSS({ ...spec, left: finalLeft }),
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lazyLoadedList,
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targetSlide,
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};
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} else {
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state = {
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animating: true,
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currentSlide: finalSlide,
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trackStyle: getTrackAnimateCSS({ ...spec, left: animationLeft }),
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lazyLoadedList,
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targetSlide,
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};
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nextState = {
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animating: false,
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currentSlide: finalSlide,
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trackStyle: getTrackCSS({ ...spec, left: finalLeft }),
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swipeLeft: null,
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targetSlide,
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};
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}
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}
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return { state, nextState };
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};
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export const changeSlide = (spec, options) => {
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let previousInt, slideOffset, targetSlide;
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const {
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slidesToScroll,
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slidesToShow,
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slideCount,
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currentSlide,
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targetSlide: previousTargetSlide,
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lazyLoad,
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infinite,
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} = spec;
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const unevenOffset = slideCount % slidesToScroll !== 0;
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const indexOffset = unevenOffset ? 0 : (slideCount - currentSlide) % slidesToScroll;
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if (options.message === 'previous') {
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slideOffset = indexOffset === 0 ? slidesToScroll : slidesToShow - indexOffset;
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targetSlide = currentSlide - slideOffset;
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if (lazyLoad && !infinite) {
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previousInt = currentSlide - slideOffset;
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targetSlide = previousInt === -1 ? slideCount - 1 : previousInt;
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}
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if (!infinite) {
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targetSlide = previousTargetSlide - slidesToScroll;
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}
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} else if (options.message === 'next') {
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slideOffset = indexOffset === 0 ? slidesToScroll : indexOffset;
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targetSlide = currentSlide + slideOffset;
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if (lazyLoad && !infinite) {
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targetSlide = ((currentSlide + slidesToScroll) % slideCount) + indexOffset;
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}
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if (!infinite) {
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targetSlide = previousTargetSlide + slidesToScroll;
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}
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} else if (options.message === 'dots') {
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// Click on dots
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targetSlide = options.index * options.slidesToScroll;
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} else if (options.message === 'children') {
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// Click on the slides
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targetSlide = options.index;
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if (infinite) {
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const direction = siblingDirection({ ...spec, targetSlide });
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if (targetSlide > options.currentSlide && direction === 'left') {
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targetSlide = targetSlide - slideCount;
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} else if (targetSlide < options.currentSlide && direction === 'right') {
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targetSlide = targetSlide + slideCount;
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}
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}
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} else if (options.message === 'index') {
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targetSlide = Number(options.index);
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}
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return targetSlide;
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};
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export const keyHandler = (e, accessibility, rtl) => {
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if (e.target.tagName.match('TEXTAREA|INPUT|SELECT') || !accessibility) {
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return '';
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}
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if (e.keyCode === 37) return rtl ? 'next' : 'previous';
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if (e.keyCode === 39) return rtl ? 'previous' : 'next';
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return '';
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};
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export const swipeStart = (e, swipe, draggable) => {
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e.target.tagName === 'IMG' && safePreventDefault(e);
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if (!swipe || (!draggable && e.type.indexOf('mouse') !== -1)) return '';
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return {
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dragging: true,
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touchObject: {
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startX: e.touches ? e.touches[0].pageX : e.clientX,
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startY: e.touches ? e.touches[0].pageY : e.clientY,
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curX: e.touches ? e.touches[0].pageX : e.clientX,
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curY: e.touches ? e.touches[0].pageY : e.clientY,
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},
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};
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};
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export const swipeMove = (e, spec) => {
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// spec also contains, trackRef and slideIndex
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const {
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scrolling,
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animating,
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vertical,
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swipeToSlide,
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verticalSwiping,
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rtl,
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currentSlide,
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edgeFriction,
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edgeDragged,
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onEdge,
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swiped,
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swiping,
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slideCount,
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slidesToScroll,
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infinite,
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touchObject,
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swipeEvent,
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listHeight,
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listWidth,
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} = spec;
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if (scrolling) return;
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if (animating) return safePreventDefault(e);
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if (vertical && swipeToSlide && verticalSwiping) safePreventDefault(e);
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let swipeLeft;
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let state = {};
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const curLeft = getTrackLeft(spec);
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touchObject.curX = e.touches ? e.touches[0].pageX : e.clientX;
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touchObject.curY = e.touches ? e.touches[0].pageY : e.clientY;
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touchObject.swipeLength = Math.round(
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Math.sqrt(Math.pow(touchObject.curX - touchObject.startX, 2)),
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);
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const verticalSwipeLength = Math.round(
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Math.sqrt(Math.pow(touchObject.curY - touchObject.startY, 2)),
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);
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if (!verticalSwiping && !swiping && verticalSwipeLength > 10) {
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return { scrolling: true };
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}
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if (verticalSwiping) touchObject.swipeLength = verticalSwipeLength;
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let positionOffset = (!rtl ? 1 : -1) * (touchObject.curX > touchObject.startX ? 1 : -1);
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if (verticalSwiping) {
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positionOffset = touchObject.curY > touchObject.startY ? 1 : -1;
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}
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const dotCount = Math.ceil(slideCount / slidesToScroll);
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const swipeDirection = getSwipeDirection(spec.touchObject, verticalSwiping);
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let touchSwipeLength = touchObject.swipeLength;
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if (!infinite) {
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if (
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(currentSlide === 0 && (swipeDirection === 'right' || swipeDirection === 'down')) ||
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(currentSlide + 1 >= dotCount && (swipeDirection === 'left' || swipeDirection === 'up')) ||
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(!canGoNext(spec) && (swipeDirection === 'left' || swipeDirection === 'up'))
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) {
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touchSwipeLength = touchObject.swipeLength * edgeFriction;
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if (edgeDragged === false && onEdge) {
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onEdge(swipeDirection);
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state['edgeDragged'] = true;
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}
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}
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}
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if (!swiped && swipeEvent) {
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swipeEvent(swipeDirection);
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state['swiped'] = true;
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}
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if (!vertical) {
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if (!rtl) {
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swipeLeft = curLeft + touchSwipeLength * positionOffset;
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} else {
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swipeLeft = curLeft - touchSwipeLength * positionOffset;
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}
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} else {
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swipeLeft = curLeft + touchSwipeLength * (listHeight / listWidth) * positionOffset;
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}
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if (verticalSwiping) {
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swipeLeft = curLeft + touchSwipeLength * positionOffset;
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}
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state = {
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...state,
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touchObject,
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swipeLeft,
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trackStyle: getTrackCSS({ ...spec, left: swipeLeft }),
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};
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if (
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Math.abs(touchObject.curX - touchObject.startX) <
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Math.abs(touchObject.curY - touchObject.startY) * 0.8
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) {
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return state;
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}
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if (touchObject.swipeLength > 10) {
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state['swiping'] = true;
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safePreventDefault(e);
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}
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return state;
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};
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export const swipeEnd = (e, spec) => {
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const {
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dragging,
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swipe,
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touchObject,
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listWidth,
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touchThreshold,
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verticalSwiping,
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listHeight,
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swipeToSlide,
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scrolling,
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onSwipe,
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targetSlide,
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currentSlide,
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infinite,
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} = spec;
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if (!dragging) {
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if (swipe) safePreventDefault(e);
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return {};
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}
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const minSwipe = verticalSwiping ? listHeight / touchThreshold : listWidth / touchThreshold;
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const swipeDirection = getSwipeDirection(touchObject, verticalSwiping);
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// reset the state of touch related state variables.
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const state = {
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dragging: false,
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edgeDragged: false,
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scrolling: false,
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swiping: false,
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swiped: false,
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swipeLeft: null,
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touchObject: {},
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};
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if (scrolling) {
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return state;
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}
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if (!touchObject.swipeLength) {
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return state;
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}
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if (touchObject.swipeLength > minSwipe) {
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safePreventDefault(e);
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if (onSwipe) {
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onSwipe(swipeDirection);
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}
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let slideCount, newSlide;
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let activeSlide = infinite ? currentSlide : targetSlide;
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switch (swipeDirection) {
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case 'left':
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case 'up':
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newSlide = activeSlide + getSlideCount(spec);
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slideCount = swipeToSlide ? checkNavigable(spec, newSlide) : newSlide;
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state['currentDirection'] = 0;
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break;
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case 'right':
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case 'down':
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newSlide = activeSlide - getSlideCount(spec);
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slideCount = swipeToSlide ? checkNavigable(spec, newSlide) : newSlide;
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state['currentDirection'] = 1;
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break;
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default:
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slideCount = activeSlide;
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}
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state['triggerSlideHandler'] = slideCount;
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} else {
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// Adjust the track back to it's original position.
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const currentLeft = getTrackLeft(spec);
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state['trackStyle'] = getTrackAnimateCSS({ ...spec, left: currentLeft });
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}
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return state;
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};
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export const getNavigableIndexes = spec => {
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const max = spec.infinite ? spec.slideCount * 2 : spec.slideCount;
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let breakpoint = spec.infinite ? spec.slidesToShow * -1 : 0;
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let counter = spec.infinite ? spec.slidesToShow * -1 : 0;
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const indexes = [];
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while (breakpoint < max) {
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indexes.push(breakpoint);
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breakpoint = counter + spec.slidesToScroll;
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counter += Math.min(spec.slidesToScroll, spec.slidesToShow);
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}
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return indexes;
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};
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export const checkNavigable = (spec, index) => {
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const navigables = getNavigableIndexes(spec);
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let prevNavigable = 0;
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if (index > navigables[navigables.length - 1]) {
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index = navigables[navigables.length - 1];
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} else {
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for (const n in navigables) {
|
|
if (index < navigables[n]) {
|
|
index = prevNavigable;
|
|
break;
|
|
}
|
|
prevNavigable = navigables[n];
|
|
}
|
|
}
|
|
return index;
|
|
};
|
|
export const getSlideCount = spec => {
|
|
const centerOffset = spec.centerMode ? spec.slideWidth * Math.floor(spec.slidesToShow / 2) : 0;
|
|
if (spec.swipeToSlide) {
|
|
let swipedSlide;
|
|
const slickList = spec.listRef;
|
|
const slides = (slickList.querySelectorAll && slickList.querySelectorAll('.slick-slide')) || [];
|
|
Array.from(slides).every(slide => {
|
|
if (!spec.vertical) {
|
|
if (slide.offsetLeft - centerOffset + getWidth(slide) / 2 > spec.swipeLeft * -1) {
|
|
swipedSlide = slide;
|
|
return false;
|
|
}
|
|
} else {
|
|
if (slide.offsetTop + getHeight(slide) / 2 > spec.swipeLeft * -1) {
|
|
swipedSlide = slide;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
});
|
|
|
|
if (!swipedSlide) {
|
|
return 0;
|
|
}
|
|
const currentIndex =
|
|
spec.rtl === true ? spec.slideCount - spec.currentSlide : spec.currentSlide;
|
|
const slidesTraversed = Math.abs(swipedSlide.dataset.index - currentIndex) || 1;
|
|
return slidesTraversed;
|
|
} else {
|
|
return spec.slidesToScroll;
|
|
}
|
|
};
|
|
|
|
export const checkSpecKeys = (spec, keysArray) =>
|
|
keysArray.reduce((value, key) => value && spec.hasOwnProperty(key), true)
|
|
? null
|
|
: console.error('Keys Missing:', spec);
|
|
|
|
export const getTrackCSS = spec => {
|
|
checkSpecKeys(spec, ['left', 'variableWidth', 'slideCount', 'slidesToShow', 'slideWidth']);
|
|
let trackWidth, trackHeight;
|
|
const trackChildren = spec.slideCount + 2 * spec.slidesToShow;
|
|
if (!spec.vertical) {
|
|
trackWidth = getTotalSlides(spec) * spec.slideWidth;
|
|
} else {
|
|
trackHeight = trackChildren * spec.slideHeight;
|
|
}
|
|
let style = {
|
|
opacity: 1,
|
|
transition: '',
|
|
WebkitTransition: '',
|
|
};
|
|
if (spec.useTransform) {
|
|
const WebkitTransform = !spec.vertical
|
|
? 'translate3d(' + spec.left + 'px, 0px, 0px)'
|
|
: 'translate3d(0px, ' + spec.left + 'px, 0px)';
|
|
const transform = !spec.vertical
|
|
? 'translate3d(' + spec.left + 'px, 0px, 0px)'
|
|
: 'translate3d(0px, ' + spec.left + 'px, 0px)';
|
|
const msTransform = !spec.vertical
|
|
? 'translateX(' + spec.left + 'px)'
|
|
: 'translateY(' + spec.left + 'px)';
|
|
style = {
|
|
...style,
|
|
WebkitTransform,
|
|
transform,
|
|
msTransform,
|
|
};
|
|
} else {
|
|
if (spec.vertical) {
|
|
style['top'] = spec.left;
|
|
} else {
|
|
style['left'] = spec.left;
|
|
}
|
|
}
|
|
if (spec.fade) style = { opacity: 1 };
|
|
if (trackWidth) style.width = trackWidth + 'px';
|
|
if (trackHeight) style.height = trackHeight + 'px';
|
|
|
|
// Fallback for IE8
|
|
if (window && !window.addEventListener && window.attachEvent) {
|
|
if (!spec.vertical) {
|
|
style.marginLeft = spec.left + 'px';
|
|
} else {
|
|
style.marginTop = spec.left + 'px';
|
|
}
|
|
}
|
|
|
|
return style;
|
|
};
|
|
export const getTrackAnimateCSS = spec => {
|
|
checkSpecKeys(spec, [
|
|
'left',
|
|
'variableWidth',
|
|
'slideCount',
|
|
'slidesToShow',
|
|
'slideWidth',
|
|
'speed',
|
|
'cssEase',
|
|
]);
|
|
const style = getTrackCSS(spec);
|
|
// useCSS is true by default so it can be undefined
|
|
if (spec.useTransform) {
|
|
style.WebkitTransition = '-webkit-transform ' + spec.speed + 'ms ' + spec.cssEase;
|
|
style.transition = 'transform ' + spec.speed + 'ms ' + spec.cssEase;
|
|
} else {
|
|
if (spec.vertical) {
|
|
style.transition = 'top ' + spec.speed + 'ms ' + spec.cssEase;
|
|
} else {
|
|
style.transition = 'left ' + spec.speed + 'ms ' + spec.cssEase;
|
|
}
|
|
}
|
|
return style;
|
|
};
|
|
export const getTrackLeft = spec => {
|
|
if (spec.unslick) {
|
|
return 0;
|
|
}
|
|
|
|
checkSpecKeys(spec, [
|
|
'slideIndex',
|
|
'trackRef',
|
|
'infinite',
|
|
'centerMode',
|
|
'slideCount',
|
|
'slidesToShow',
|
|
'slidesToScroll',
|
|
'slideWidth',
|
|
'listWidth',
|
|
'variableWidth',
|
|
'slideHeight',
|
|
]);
|
|
|
|
const {
|
|
slideIndex,
|
|
trackRef,
|
|
infinite,
|
|
centerMode,
|
|
slideCount,
|
|
slidesToShow,
|
|
slidesToScroll,
|
|
slideWidth,
|
|
listWidth,
|
|
variableWidth,
|
|
slideHeight,
|
|
fade,
|
|
vertical,
|
|
} = spec;
|
|
|
|
let slideOffset = 0;
|
|
let targetLeft;
|
|
let targetSlide;
|
|
let verticalOffset = 0;
|
|
|
|
if (fade || spec.slideCount === 1) {
|
|
return 0;
|
|
}
|
|
|
|
let slidesToOffset = 0;
|
|
if (infinite) {
|
|
slidesToOffset = -getPreClones(spec); // bring active slide to the beginning of visual area
|
|
// if next scroll doesn't have enough children, just reach till the end of original slides instead of shifting slidesToScroll children
|
|
if (slideCount % slidesToScroll !== 0 && slideIndex + slidesToScroll > slideCount) {
|
|
slidesToOffset = -(slideIndex > slideCount
|
|
? slidesToShow - (slideIndex - slideCount)
|
|
: slideCount % slidesToScroll);
|
|
}
|
|
// shift current slide to center of the frame
|
|
if (centerMode) {
|
|
slidesToOffset += parseInt(slidesToShow / 2);
|
|
}
|
|
} else {
|
|
if (slideCount % slidesToScroll !== 0 && slideIndex + slidesToScroll > slideCount) {
|
|
slidesToOffset = slidesToShow - (slideCount % slidesToScroll);
|
|
}
|
|
if (centerMode) {
|
|
slidesToOffset = parseInt(slidesToShow / 2);
|
|
}
|
|
}
|
|
slideOffset = slidesToOffset * slideWidth;
|
|
verticalOffset = slidesToOffset * slideHeight;
|
|
|
|
if (!vertical) {
|
|
targetLeft = slideIndex * slideWidth * -1 + slideOffset;
|
|
} else {
|
|
targetLeft = slideIndex * slideHeight * -1 + verticalOffset;
|
|
}
|
|
|
|
if (variableWidth === true) {
|
|
let targetSlideIndex;
|
|
const trackElem = trackRef;
|
|
targetSlideIndex = slideIndex + getPreClones(spec);
|
|
targetSlide = trackElem && trackElem.childNodes[targetSlideIndex];
|
|
targetLeft = targetSlide ? targetSlide.offsetLeft * -1 : 0;
|
|
if (centerMode === true) {
|
|
targetSlideIndex = infinite ? slideIndex + getPreClones(spec) : slideIndex;
|
|
targetSlide = trackElem && trackElem.children[targetSlideIndex];
|
|
targetLeft = 0;
|
|
for (let slide = 0; slide < targetSlideIndex; slide++) {
|
|
targetLeft -=
|
|
trackElem && trackElem.children[slide] && trackElem.children[slide].offsetWidth;
|
|
}
|
|
targetLeft -= parseInt(spec.centerPadding);
|
|
targetLeft += targetSlide && (listWidth - targetSlide.offsetWidth) / 2;
|
|
}
|
|
}
|
|
|
|
return targetLeft;
|
|
};
|
|
|
|
export const getPreClones = spec => {
|
|
if (spec.unslick || !spec.infinite) {
|
|
return 0;
|
|
}
|
|
if (spec.variableWidth) {
|
|
return spec.slideCount;
|
|
}
|
|
return spec.slidesToShow + (spec.centerMode ? 1 : 0);
|
|
};
|
|
|
|
export const getPostClones = spec => {
|
|
if (spec.unslick || !spec.infinite) {
|
|
return 0;
|
|
}
|
|
return spec.slideCount;
|
|
};
|
|
|
|
export const getTotalSlides = spec =>
|
|
spec.slideCount === 1 ? 1 : getPreClones(spec) + spec.slideCount + getPostClones(spec);
|
|
export const siblingDirection = spec => {
|
|
if (spec.targetSlide > spec.currentSlide) {
|
|
if (spec.targetSlide > spec.currentSlide + slidesOnRight(spec)) {
|
|
return 'left';
|
|
}
|
|
return 'right';
|
|
} else {
|
|
if (spec.targetSlide < spec.currentSlide - slidesOnLeft(spec)) {
|
|
return 'right';
|
|
}
|
|
return 'left';
|
|
}
|
|
};
|
|
|
|
export const slidesOnRight = ({ slidesToShow, centerMode, rtl, centerPadding }) => {
|
|
// returns no of slides on the right of active slide
|
|
if (centerMode) {
|
|
let right = (slidesToShow - 1) / 2 + 1;
|
|
if (parseInt(centerPadding) > 0) right += 1;
|
|
if (rtl && slidesToShow % 2 === 0) right += 1;
|
|
return right;
|
|
}
|
|
if (rtl) {
|
|
return 0;
|
|
}
|
|
return slidesToShow - 1;
|
|
};
|
|
|
|
export const slidesOnLeft = ({ slidesToShow, centerMode, rtl, centerPadding }) => {
|
|
// returns no of slides on the left of active slide
|
|
if (centerMode) {
|
|
let left = (slidesToShow - 1) / 2 + 1;
|
|
if (parseInt(centerPadding) > 0) left += 1;
|
|
if (!rtl && slidesToShow % 2 === 0) left += 1;
|
|
return left;
|
|
}
|
|
if (rtl) {
|
|
return slidesToShow - 1;
|
|
}
|
|
return 0;
|
|
};
|
|
|
|
export const canUseDOM = () =>
|
|
!!(typeof window !== 'undefined' && window.document && window.document.createElement);
|