swiper
Version:
Most modern mobile touch slider and framework with hardware accelerated transitions
270 lines (235 loc) • 8.63 kB
JavaScript
function _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }
import $ from '../../utils/dom';
import { extend, bindModuleMethods } from '../../utils/utils';
var Virtual = {
update: function update(force) {
var swiper = this;
var _swiper$params = swiper.params,
slidesPerView = _swiper$params.slidesPerView,
slidesPerGroup = _swiper$params.slidesPerGroup,
centeredSlides = _swiper$params.centeredSlides;
var _swiper$params$virtua = swiper.params.virtual,
addSlidesBefore = _swiper$params$virtua.addSlidesBefore,
addSlidesAfter = _swiper$params$virtua.addSlidesAfter;
var _swiper$virtual = swiper.virtual,
previousFrom = _swiper$virtual.from,
previousTo = _swiper$virtual.to,
slides = _swiper$virtual.slides,
previousSlidesGrid = _swiper$virtual.slidesGrid,
renderSlide = _swiper$virtual.renderSlide,
previousOffset = _swiper$virtual.offset;
swiper.updateActiveIndex();
var activeIndex = swiper.activeIndex || 0;
var offsetProp;
if (swiper.rtlTranslate) offsetProp = 'right';else offsetProp = swiper.isHorizontal() ? 'left' : 'top';
var slidesAfter;
var slidesBefore;
if (centeredSlides) {
slidesAfter = Math.floor(slidesPerView / 2) + slidesPerGroup + addSlidesAfter;
slidesBefore = Math.floor(slidesPerView / 2) + slidesPerGroup + addSlidesBefore;
} else {
slidesAfter = slidesPerView + (slidesPerGroup - 1) + addSlidesAfter;
slidesBefore = slidesPerGroup + addSlidesBefore;
}
var from = Math.max((activeIndex || 0) - slidesBefore, 0);
var to = Math.min((activeIndex || 0) + slidesAfter, slides.length - 1);
var offset = (swiper.slidesGrid[from] || 0) - (swiper.slidesGrid[0] || 0);
extend(swiper.virtual, {
from: from,
to: to,
offset: offset,
slidesGrid: swiper.slidesGrid
});
function onRendered() {
swiper.updateSlides();
swiper.updateProgress();
swiper.updateSlidesClasses();
if (swiper.lazy && swiper.params.lazy.enabled) {
swiper.lazy.load();
}
}
if (previousFrom === from && previousTo === to && !force) {
if (swiper.slidesGrid !== previousSlidesGrid && offset !== previousOffset) {
swiper.slides.css(offsetProp, offset + "px");
}
swiper.updateProgress();
return;
}
if (swiper.params.virtual.renderExternal) {
swiper.params.virtual.renderExternal.call(swiper, {
offset: offset,
from: from,
to: to,
slides: function getSlides() {
var slidesToRender = [];
for (var i = from; i <= to; i += 1) {
slidesToRender.push(slides[i]);
}
return slidesToRender;
}()
});
if (swiper.params.virtual.renderExternalUpdate) {
onRendered();
}
return;
}
var prependIndexes = [];
var appendIndexes = [];
if (force) {
swiper.$wrapperEl.find("." + swiper.params.slideClass).remove();
} else {
for (var i = previousFrom; i <= previousTo; i += 1) {
if (i < from || i > to) {
swiper.$wrapperEl.find("." + swiper.params.slideClass + "[data-swiper-slide-index=\"" + i + "\"]").remove();
}
}
}
for (var _i = 0; _i < slides.length; _i += 1) {
if (_i >= from && _i <= to) {
if (typeof previousTo === 'undefined' || force) {
appendIndexes.push(_i);
} else {
if (_i > previousTo) appendIndexes.push(_i);
if (_i < previousFrom) prependIndexes.push(_i);
}
}
}
appendIndexes.forEach(function (index) {
swiper.$wrapperEl.append(renderSlide(slides[index], index));
});
prependIndexes.sort(function (a, b) {
return b - a;
}).forEach(function (index) {
swiper.$wrapperEl.prepend(renderSlide(slides[index], index));
});
swiper.$wrapperEl.children('.swiper-slide').css(offsetProp, offset + "px");
onRendered();
},
renderSlide: function renderSlide(slide, index) {
var swiper = this;
var params = swiper.params.virtual;
if (params.cache && swiper.virtual.cache[index]) {
return swiper.virtual.cache[index];
}
var $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;
},
appendSlide: function appendSlide(slides) {
var swiper = this;
if (typeof slides === 'object' && 'length' in slides) {
for (var i = 0; i < slides.length; i += 1) {
if (slides[i]) swiper.virtual.slides.push(slides[i]);
}
} else {
swiper.virtual.slides.push(slides);
}
swiper.virtual.update(true);
},
prependSlide: function prependSlide(slides) {
var swiper = this;
var activeIndex = swiper.activeIndex;
var newActiveIndex = activeIndex + 1;
var numberOfNewSlides = 1;
if (Array.isArray(slides)) {
for (var 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) {
var cache = swiper.virtual.cache;
var newCache = {};
Object.keys(cache).forEach(function (cachedIndex) {
var $cachedEl = cache[cachedIndex];
var cachedElIndex = $cachedEl.attr('data-swiper-slide-index');
if (cachedElIndex) {
$cachedEl.attr('data-swiper-slide-index', parseInt(cachedElIndex, 10) + 1);
}
newCache[parseInt(cachedIndex, 10) + numberOfNewSlides] = $cachedEl;
});
swiper.virtual.cache = newCache;
}
swiper.virtual.update(true);
swiper.slideTo(newActiveIndex, 0);
},
removeSlide: function removeSlide(slidesIndexes) {
var swiper = this;
if (typeof slidesIndexes === 'undefined' || slidesIndexes === null) return;
var activeIndex = swiper.activeIndex;
if (Array.isArray(slidesIndexes)) {
for (var 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);
}
swiper.virtual.update(true);
swiper.slideTo(activeIndex, 0);
},
removeAllSlides: function removeAllSlides() {
var swiper = this;
swiper.virtual.slides = [];
if (swiper.params.virtual.cache) {
swiper.virtual.cache = {};
}
swiper.virtual.update(true);
swiper.slideTo(0, 0);
}
};
export default {
name: 'virtual',
params: {
virtual: {
enabled: false,
slides: [],
cache: true,
renderSlide: null,
renderExternal: null,
renderExternalUpdate: true,
addSlidesBefore: 0,
addSlidesAfter: 0
}
},
create: function create() {
var swiper = this;
bindModuleMethods(swiper, {
virtual: _extends(_extends({}, Virtual), {}, {
slides: swiper.params.virtual.slides,
cache: {}
})
});
},
on: {
beforeInit: function beforeInit(swiper) {
if (!swiper.params.virtual.enabled) return;
swiper.classNames.push(swiper.params.containerModifierClass + "virtual");
var overwriteParams = {
watchSlidesProgress: true
};
extend(swiper.params, overwriteParams);
extend(swiper.originalParams, overwriteParams);
if (!swiper.params.initialSlide) {
swiper.virtual.update();
}
},
setTranslate: function setTranslate(swiper) {
if (!swiper.params.virtual.enabled) return;
swiper.virtual.update();
}
}
};