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Mini Shell
Mini Shell
import $ from '../../shared/dom.js';
import { setCSSProperty } from '../../shared/utils.js';
export default function Virtual(_ref) {
let {
swiper,
extendParams,
on
} = _ref;
extendParams({
virtual: {
enabled: false,
slides: [],
cache: true,
renderSlide: null,
renderExternal: null,
renderExternalUpdate: true,
addSlidesBefore: 0,
addSlidesAfter: 0
}
});
let cssModeTimeout;
swiper.virtual = {
cache: {},
from: undefined,
to: undefined,
slides: [],
offset: 0,
slidesGrid: []
};
function renderSlide(slide, index) {
const params = swiper.params.virtual;
if (params.cache && swiper.virtual.cache[index]) {
return swiper.virtual.cache[index];
}
const $slideEl = params.renderSlide ? $(params.renderSlide.call(swiper, slide, index)) : $(`<div class="${swiper.params.slideClass}" data-swiper-slide-index="${index}">${slide}</div>`);
if (!$slideEl.attr('data-swiper-slide-index')) $slideEl.attr('data-swiper-slide-index', index);
if (params.cache) swiper.virtual.cache[index] = $slideEl;
return $slideEl;
}
function update(force) {
const {
slidesPerView,
slidesPerGroup,
centeredSlides
} = swiper.params;
const {
addSlidesBefore,
addSlidesAfter
} = swiper.params.virtual;
const {
from: previousFrom,
to: previousTo,
slides,
slidesGrid: previousSlidesGrid,
offset: previousOffset
} = swiper.virtual;
if (!swiper.params.cssMode) {
swiper.updateActiveIndex();
}
const activeIndex = swiper.activeIndex || 0;
let offsetProp;
if (swiper.rtlTranslate) offsetProp = 'right';else offsetProp = swiper.isHorizontal() ? 'left' : 'top';
let slidesAfter;
let slidesBefore;
if (centeredSlides) {
slidesAfter = Math.floor(slidesPerView / 2) + slidesPerGroup + addSlidesAfter;
slidesBefore = Math.floor(slidesPerView / 2) + slidesPerGroup + addSlidesBefore;
} else {
slidesAfter = slidesPerView + (slidesPerGroup - 1) + addSlidesAfter;
slidesBefore = slidesPerGroup + addSlidesBefore;
}
const from = Math.max((activeIndex || 0) - slidesBefore, 0);
const to = Math.min((activeIndex || 0) + slidesAfter, slides.length - 1);
const offset = (swiper.slidesGrid[from] || 0) - (swiper.slidesGrid[0] || 0);
Object.assign(swiper.virtual, {
from,
to,
offset,
slidesGrid: swiper.slidesGrid
});
function onRendered() {
swiper.updateSlides();
swiper.updateProgress();
swiper.updateSlidesClasses();
if (swiper.lazy && swiper.params.lazy.enabled) {
swiper.lazy.load();
}
}
if (previousFrom === from && previousTo === to && !force) {
if (swiper.slidesGrid !== previousSlidesGrid && offset !== previousOffset) {
swiper.slides.css(offsetProp, `${offset}px`);
}
swiper.updateProgress();
return;
}
if (swiper.params.virtual.renderExternal) {
swiper.params.virtual.renderExternal.call(swiper, {
offset,
from,
to,
slides: function getSlides() {
const slidesToRender = [];
for (let i = from; i <= to; i += 1) {
slidesToRender.push(slides[i]);
}
return slidesToRender;
}()
});
if (swiper.params.virtual.renderExternalUpdate) {
onRendered();
}
return;
}
const prependIndexes = [];
const appendIndexes = [];
if (force) {
swiper.$wrapperEl.find(`.${swiper.params.slideClass}`).remove();
} else {
for (let i = previousFrom; i <= previousTo; i += 1) {
if (i < from || i > to) {
swiper.$wrapperEl.find(`.${swiper.params.slideClass}[data-swiper-slide-index="${i}"]`).remove();
}
}
}
for (let i = 0; i < slides.length; i += 1) {
if (i >= from && i <= to) {
if (typeof previousTo === 'undefined' || force) {
appendIndexes.push(i);
} else {
if (i > previousTo) appendIndexes.push(i);
if (i < previousFrom) prependIndexes.push(i);
}
}
}
appendIndexes.forEach(index => {
swiper.$wrapperEl.append(renderSlide(slides[index], index));
});
prependIndexes.sort((a, b) => b - a).forEach(index => {
swiper.$wrapperEl.prepend(renderSlide(slides[index], index));
});
swiper.$wrapperEl.children('.swiper-slide').css(offsetProp, `${offset}px`);
onRendered();
}
function appendSlide(slides) {
if (typeof slides === 'object' && 'length' in slides) {
for (let i = 0; i < slides.length; i += 1) {
if (slides[i]) swiper.virtual.slides.push(slides[i]);
}
} else {
swiper.virtual.slides.push(slides);
}
update(true);
}
function prependSlide(slides) {
const activeIndex = swiper.activeIndex;
let newActiveIndex = activeIndex + 1;
let numberOfNewSlides = 1;
if (Array.isArray(slides)) {
for (let i = 0; i < slides.length; i += 1) {
if (slides[i]) swiper.virtual.slides.unshift(slides[i]);
}
newActiveIndex = activeIndex + slides.length;
numberOfNewSlides = slides.length;
} else {
swiper.virtual.slides.unshift(slides);
}
if (swiper.params.virtual.cache) {
const cache = swiper.virtual.cache;
const newCache = {};
Object.keys(cache).forEach(cachedIndex => {
const $cachedEl = cache[cachedIndex];
const cachedElIndex = $cachedEl.attr('data-swiper-slide-index');
if (cachedElIndex) {
$cachedEl.attr('data-swiper-slide-index', parseInt(cachedElIndex, 10) + numberOfNewSlides);
}
newCache[parseInt(cachedIndex, 10) + numberOfNewSlides] = $cachedEl;
});
swiper.virtual.cache = newCache;
}
update(true);
swiper.slideTo(newActiveIndex, 0);
}
function removeSlide(slidesIndexes) {
if (typeof slidesIndexes === 'undefined' || slidesIndexes === null) return;
let activeIndex = swiper.activeIndex;
if (Array.isArray(slidesIndexes)) {
for (let i = slidesIndexes.length - 1; i >= 0; i -= 1) {
swiper.virtual.slides.splice(slidesIndexes[i], 1);
if (swiper.params.virtual.cache) {
delete swiper.virtual.cache[slidesIndexes[i]];
}
if (slidesIndexes[i] < activeIndex) activeIndex -= 1;
activeIndex = Math.max(activeIndex, 0);
}
} else {
swiper.virtual.slides.splice(slidesIndexes, 1);
if (swiper.params.virtual.cache) {
delete swiper.virtual.cache[slidesIndexes];
}
if (slidesIndexes < activeIndex) activeIndex -= 1;
activeIndex = Math.max(activeIndex, 0);
}
update(true);
swiper.slideTo(activeIndex, 0);
}
function removeAllSlides() {
swiper.virtual.slides = [];
if (swiper.params.virtual.cache) {
swiper.virtual.cache = {};
}
update(true);
swiper.slideTo(0, 0);
}
on('beforeInit', () => {
if (!swiper.params.virtual.enabled) return;
swiper.virtual.slides = swiper.params.virtual.slides;
swiper.classNames.push(`${swiper.params.containerModifierClass}virtual`);
swiper.params.watchSlidesProgress = true;
swiper.originalParams.watchSlidesProgress = true;
if (!swiper.params.initialSlide) {
update();
}
});
on('setTranslate', () => {
if (!swiper.params.virtual.enabled) return;
if (swiper.params.cssMode && !swiper._immediateVirtual) {
clearTimeout(cssModeTimeout);
cssModeTimeout = setTimeout(() => {
update();
}, 100);
} else {
update();
}
});
on('init update resize', () => {
if (!swiper.params.virtual.enabled) return;
if (swiper.params.cssMode) {
setCSSProperty(swiper.wrapperEl, '--swiper-virtual-size', `${swiper.virtualSize}px`);
}
});
Object.assign(swiper.virtual, {
appendSlide,
prependSlide,
removeSlide,
removeAllSlides,
update
});
}
Zerion Mini Shell 1.0