1 | import $ from '../../shared/dom.js';
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2 | import { setCSSProperty } from '../../shared/utils.js';
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3 | export default function Virtual({
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4 | swiper,
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5 | extendParams,
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6 | on,
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7 | emit
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8 | }) {
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9 | extendParams({
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10 | virtual: {
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11 | enabled: false,
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12 | slides: [],
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13 | cache: true,
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14 | renderSlide: null,
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15 | renderExternal: null,
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16 | renderExternalUpdate: true,
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17 | addSlidesBefore: 0,
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18 | addSlidesAfter: 0
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19 | }
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20 | });
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21 | let cssModeTimeout;
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22 | swiper.virtual = {
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23 | cache: {},
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24 | from: undefined,
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25 | to: undefined,
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26 | slides: [],
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27 | offset: 0,
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28 | slidesGrid: []
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29 | };
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30 |
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31 | function renderSlide(slide, index) {
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32 | const params = swiper.params.virtual;
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33 |
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34 | if (params.cache && swiper.virtual.cache[index]) {
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35 | return swiper.virtual.cache[index];
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36 | }
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37 |
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38 | const $slideEl = params.renderSlide ? $(params.renderSlide.call(swiper, slide, index)) : $(`<div class="${swiper.params.slideClass}" data-swiper-slide-index="${index}">${slide}</div>`);
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39 | if (!$slideEl.attr('data-swiper-slide-index')) $slideEl.attr('data-swiper-slide-index', index);
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40 | if (params.cache) swiper.virtual.cache[index] = $slideEl;
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41 | return $slideEl;
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42 | }
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43 |
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44 | function update(force) {
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45 | const {
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46 | slidesPerView,
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47 | slidesPerGroup,
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48 | centeredSlides
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49 | } = swiper.params;
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50 | const {
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51 | addSlidesBefore,
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52 | addSlidesAfter
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53 | } = swiper.params.virtual;
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54 | const {
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55 | from: previousFrom,
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56 | to: previousTo,
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57 | slides,
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58 | slidesGrid: previousSlidesGrid,
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59 | offset: previousOffset
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60 | } = swiper.virtual;
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61 |
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62 | if (!swiper.params.cssMode) {
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63 | swiper.updateActiveIndex();
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64 | }
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65 |
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66 | const activeIndex = swiper.activeIndex || 0;
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67 | let offsetProp;
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68 | if (swiper.rtlTranslate) offsetProp = 'right';else offsetProp = swiper.isHorizontal() ? 'left' : 'top';
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69 | let slidesAfter;
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70 | let slidesBefore;
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71 |
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72 | if (centeredSlides) {
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73 | slidesAfter = Math.floor(slidesPerView / 2) + slidesPerGroup + addSlidesAfter;
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74 | slidesBefore = Math.floor(slidesPerView / 2) + slidesPerGroup + addSlidesBefore;
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75 | } else {
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76 | slidesAfter = slidesPerView + (slidesPerGroup - 1) + addSlidesAfter;
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77 | slidesBefore = slidesPerGroup + addSlidesBefore;
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78 | }
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79 |
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80 | const from = Math.max((activeIndex || 0) - slidesBefore, 0);
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81 | const to = Math.min((activeIndex || 0) + slidesAfter, slides.length - 1);
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82 | const offset = (swiper.slidesGrid[from] || 0) - (swiper.slidesGrid[0] || 0);
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83 | Object.assign(swiper.virtual, {
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84 | from,
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85 | to,
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86 | offset,
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87 | slidesGrid: swiper.slidesGrid
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88 | });
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89 |
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90 | function onRendered() {
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91 | swiper.updateSlides();
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92 | swiper.updateProgress();
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93 | swiper.updateSlidesClasses();
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94 |
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95 | if (swiper.lazy && swiper.params.lazy.enabled) {
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96 | swiper.lazy.load();
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97 | }
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98 |
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99 | emit('virtualUpdate');
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100 | }
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101 |
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102 | if (previousFrom === from && previousTo === to && !force) {
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103 | if (swiper.slidesGrid !== previousSlidesGrid && offset !== previousOffset) {
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104 | swiper.slides.css(offsetProp, `${offset}px`);
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105 | }
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106 |
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107 | swiper.updateProgress();
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108 | emit('virtualUpdate');
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109 | return;
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110 | }
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111 |
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112 | if (swiper.params.virtual.renderExternal) {
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113 | swiper.params.virtual.renderExternal.call(swiper, {
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114 | offset,
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115 | from,
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116 | to,
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117 | slides: function getSlides() {
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118 | const slidesToRender = [];
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119 |
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120 | for (let i = from; i <= to; i += 1) {
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121 | slidesToRender.push(slides[i]);
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122 | }
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123 |
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124 | return slidesToRender;
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125 | }()
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126 | });
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127 |
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128 | if (swiper.params.virtual.renderExternalUpdate) {
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129 | onRendered();
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130 | } else {
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131 | emit('virtualUpdate');
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132 | }
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133 |
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134 | return;
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135 | }
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136 |
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137 | const prependIndexes = [];
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138 | const appendIndexes = [];
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139 |
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140 | if (force) {
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141 | swiper.$wrapperEl.find(`.${swiper.params.slideClass}`).remove();
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142 | } else {
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143 | for (let i = previousFrom; i <= previousTo; i += 1) {
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144 | if (i < from || i > to) {
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145 | swiper.$wrapperEl.find(`.${swiper.params.slideClass}[data-swiper-slide-index="${i}"]`).remove();
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146 | }
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147 | }
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148 | }
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149 |
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150 | for (let i = 0; i < slides.length; i += 1) {
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151 | if (i >= from && i <= to) {
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152 | if (typeof previousTo === 'undefined' || force) {
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153 | appendIndexes.push(i);
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154 | } else {
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155 | if (i > previousTo) appendIndexes.push(i);
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156 | if (i < previousFrom) prependIndexes.push(i);
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157 | }
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158 | }
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159 | }
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160 |
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161 | appendIndexes.forEach(index => {
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162 | swiper.$wrapperEl.append(renderSlide(slides[index], index));
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163 | });
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164 | prependIndexes.sort((a, b) => b - a).forEach(index => {
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165 | swiper.$wrapperEl.prepend(renderSlide(slides[index], index));
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166 | });
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167 | swiper.$wrapperEl.children('.swiper-slide').css(offsetProp, `${offset}px`);
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168 | onRendered();
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169 | }
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170 |
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171 | function appendSlide(slides) {
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172 | if (typeof slides === 'object' && 'length' in slides) {
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173 | for (let i = 0; i < slides.length; i += 1) {
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174 | if (slides[i]) swiper.virtual.slides.push(slides[i]);
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175 | }
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176 | } else {
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177 | swiper.virtual.slides.push(slides);
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178 | }
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179 |
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180 | update(true);
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181 | }
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182 |
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183 | function prependSlide(slides) {
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184 | const activeIndex = swiper.activeIndex;
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185 | let newActiveIndex = activeIndex + 1;
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186 | let numberOfNewSlides = 1;
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187 |
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188 | if (Array.isArray(slides)) {
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189 | for (let i = 0; i < slides.length; i += 1) {
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190 | if (slides[i]) swiper.virtual.slides.unshift(slides[i]);
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191 | }
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192 |
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193 | newActiveIndex = activeIndex + slides.length;
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194 | numberOfNewSlides = slides.length;
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195 | } else {
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196 | swiper.virtual.slides.unshift(slides);
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197 | }
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198 |
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199 | if (swiper.params.virtual.cache) {
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200 | const cache = swiper.virtual.cache;
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201 | const newCache = {};
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202 | Object.keys(cache).forEach(cachedIndex => {
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203 | const $cachedEl = cache[cachedIndex];
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204 | const cachedElIndex = $cachedEl.attr('data-swiper-slide-index');
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205 |
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206 | if (cachedElIndex) {
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207 | $cachedEl.attr('data-swiper-slide-index', parseInt(cachedElIndex, 10) + numberOfNewSlides);
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208 | }
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209 |
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210 | newCache[parseInt(cachedIndex, 10) + numberOfNewSlides] = $cachedEl;
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211 | });
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212 | swiper.virtual.cache = newCache;
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213 | }
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214 |
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215 | update(true);
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216 | swiper.slideTo(newActiveIndex, 0);
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217 | }
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218 |
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219 | function removeSlide(slidesIndexes) {
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220 | if (typeof slidesIndexes === 'undefined' || slidesIndexes === null) return;
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221 | let activeIndex = swiper.activeIndex;
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222 |
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223 | if (Array.isArray(slidesIndexes)) {
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224 | for (let i = slidesIndexes.length - 1; i >= 0; i -= 1) {
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225 | swiper.virtual.slides.splice(slidesIndexes[i], 1);
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226 |
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227 | if (swiper.params.virtual.cache) {
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228 | delete swiper.virtual.cache[slidesIndexes[i]];
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229 | }
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230 |
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231 | if (slidesIndexes[i] < activeIndex) activeIndex -= 1;
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232 | activeIndex = Math.max(activeIndex, 0);
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233 | }
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234 | } else {
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235 | swiper.virtual.slides.splice(slidesIndexes, 1);
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236 |
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237 | if (swiper.params.virtual.cache) {
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238 | delete swiper.virtual.cache[slidesIndexes];
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239 | }
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240 |
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241 | if (slidesIndexes < activeIndex) activeIndex -= 1;
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242 | activeIndex = Math.max(activeIndex, 0);
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243 | }
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244 |
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245 | update(true);
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246 | swiper.slideTo(activeIndex, 0);
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247 | }
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248 |
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249 | function removeAllSlides() {
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250 | swiper.virtual.slides = [];
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251 |
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252 | if (swiper.params.virtual.cache) {
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253 | swiper.virtual.cache = {};
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254 | }
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255 |
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256 | update(true);
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257 | swiper.slideTo(0, 0);
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258 | }
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259 |
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260 | on('beforeInit', () => {
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261 | if (!swiper.params.virtual.enabled) return;
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262 | swiper.virtual.slides = swiper.params.virtual.slides;
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263 | swiper.classNames.push(`${swiper.params.containerModifierClass}virtual`);
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264 | swiper.params.watchSlidesProgress = true;
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265 | swiper.originalParams.watchSlidesProgress = true;
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266 |
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267 | if (!swiper.params.initialSlide) {
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268 | update();
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269 | }
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270 | });
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271 | on('setTranslate', () => {
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272 | if (!swiper.params.virtual.enabled) return;
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273 |
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274 | if (swiper.params.cssMode && !swiper._immediateVirtual) {
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275 | clearTimeout(cssModeTimeout);
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276 | cssModeTimeout = setTimeout(() => {
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277 | update();
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278 | }, 100);
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279 | } else {
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280 | update();
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281 | }
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282 | });
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283 | on('init update resize', () => {
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284 | if (!swiper.params.virtual.enabled) return;
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285 |
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286 | if (swiper.params.cssMode) {
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287 | setCSSProperty(swiper.wrapperEl, '--swiper-virtual-size', `${swiper.virtualSize}px`);
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288 | }
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289 | });
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290 | Object.assign(swiper.virtual, {
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291 | appendSlide,
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292 | prependSlide,
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293 | removeSlide,
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294 | removeAllSlides,
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295 | update
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296 | });
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297 | } |
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