<template>
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<view class="tn-tabs-swiper-class tn-tabs-swiper" :class="[backgroundColorClass]" :style="{backgroundColor: backgroundColorStyle, marginTop: $t.string.getLengthUnitValue(top, 'px'), zIndex: zIndex}">
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<scroll-view scroll-x class="tn-tabs-swiper__scroll-view" :scroll-left="scrollLeft" scroll-with-animation :style="{zIndex: zIndex + 1}">
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<view class="tn-tabs-swiper__scroll-view__box" :class="{'tn-tabs-swiper__scroll-view--flex': !isScroll}">
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<!-- item -->
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<view
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v-for="(item, index) in list"
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:key="index"
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:id="'tn-tabs-swiper__scroll-view__item-' + index"
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class="tn-tabs-swiper__scroll-view__item tn-text-ellipsis"
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:style="[tabItemStyle(index)]"
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@tap="emit(index)"
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>
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<tn-badge v-if="item[count] || item['count']" backgroundColor="tn-bg-red" fontColor="#FFFFFF" :absolute="true" :top="badgeOffset[0] || 0" :right="badgeOffset[1] || 0">{{ item[count] || item['count']}}</tn-badge>
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{{ item[name] || item['name'] }}
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</view>
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<!-- 底部滑块 -->
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<view v-if="showBar" class="tn-tabs-swiper__bar" :style="[tabBarStyle]"></view>
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</view>
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</scroll-view>
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</view>
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</template>
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<script>
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import componentsColor from '../../libs/mixin/components_color.js'
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const { windowWidth } = uni.getSystemInfoSync()
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export default {
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mixins: [componentsColor],
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name: 'tn-tabs-swiper',
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props: {
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// 标签列表
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list: {
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type: Array,
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default() {
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return []
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}
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},
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// 列表数据tab名称的属性
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name: {
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type: String,
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default: 'name'
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},
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// 列表数据微标数量的属性
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count: {
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type: String,
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default: 'count'
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},
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// 当前活动的tab索引
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current: {
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type: Number,
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default: 0
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},
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// 菜单是否可以滑动
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isScroll: {
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type: Boolean,
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default: true
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},
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// 高度
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height: {
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type: Number,
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default: 80
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},
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// 距离顶部的距离(px)
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top: {
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type: Number,
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default: 0
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},
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// item的高度
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itemWidth: {
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type: [String, Number],
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default: 'auto'
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},
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// swiper的宽度
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swiperWidth: {
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type: Number,
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default: 750
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},
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// 选中时的颜色
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activeColor: {
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type: String,
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default: '#01BEFF'
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},
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// 未被选中时的颜色
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inactiveColor: {
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type: String,
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default: '#080808'
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},
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// 选中的item样式
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activeItemStyle: {
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type: Object,
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default() {
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return {}
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}
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},
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// 是否显示底部滑块
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showBar: {
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type: Boolean,
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default: true
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},
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// 底部滑块的宽度
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barWidth: {
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type: Number,
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default: 40
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},
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// 底部滑块的高度
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barHeight: {
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type: Number,
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default: 6
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},
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// 自定义底部滑块的样式
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barStyle: {
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type: Object,
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default() {
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return {}
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}
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},
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// 单个tab的左右内边距
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gutter: {
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type: Number,
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default: 30
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},
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// 微标的偏移数[top, right]
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badgeOffset: {
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type: Array,
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default() {
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return [20, 22]
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}
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},
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// 是否加粗字体
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bold: {
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type: Boolean,
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default: false
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},
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// 滚动至中心目标类型
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autoCenterMode: {
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type: String,
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default: 'window'
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},
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zIndex: {
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type: Number,
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default: 1
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}
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},
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computed: {
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currentIndex() {
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const current = Number(this.current)
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// 判断是否超出
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if (current > this.list.length - 1) {
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return this.list.length - 1
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}
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if (current < 0) return 0
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return current
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},
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// 滑块需要移动的距离
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scrollBarLeft() {
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return Number(this.tabLineDx) + Number(this.tabLineAddDx)
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},
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// 滑块宽度转换为px
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barWidthPx() {
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return uni.upx2px(this.barWidth)
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},
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// 将swiper宽度转换为px
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swiperWidthPx() {
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return uni.upx2px(this.swiperWidth)
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},
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// tab样式
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tabItemStyle() {
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return index => {
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let style = {
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height: this.$t.string.getLengthUnitValue(this.height),
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lineHeight: this.$t.string.getLengthUnitValue(this.height),
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fontSize: this.fontSizeStyle || '28rpx',
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color: this.tabsInfo.length > 0 ? (this.tabsInfo[index] ? this.tabsInfo[index].color : this.activeColor) : this.inactiveColor,
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padding: this.isScroll ? `0 ${this.gutter}rpx` : '',
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flex: this.isScroll ? 'auto' : '1',
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zIndex: this.zIndex + 2
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}
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if (index === this.currentIndex) {
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if (this.bold) {
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style.fontWeight = 'bold'
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}
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Object.assign(style, this.activeItemStyle)
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}
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return style
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}
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},
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// 底部滑块样式
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tabBarStyle() {
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let style = {
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width: this.$t.string.getLengthUnitValue(this.barWidth),
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height: this.$t.string.getLengthUnitValue(this.barHeight),
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borderRadius: `${this.barHeight / 2}rpx`,
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backgroundColor: this.activeColor,
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left: this.scrollBarLeft + 'px'
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}
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Object.assign(style, this.barStyle)
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return style
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},
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},
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data() {
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return {
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// 滚动scroll-view的左边滚动距离
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scrollLeft: 0,
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// 存放tab菜单节点信息
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tabsInfo: [],
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// 屏幕宽度
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windowWidth: 0,
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// 滑动动画结束后对应的标签Index
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animationFinishCurrent: this.current,
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// 组件的宽度
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componentsWidth: 0,
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// 移动距离
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tabLineAddDx: 0,
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tabLineDx: 0,
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// 颜色渐变数组
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colorGradientArr: [],
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// 两个颜色之间的渐变等分
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colorStep: 100,
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}
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},
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watch: {
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current(value) {
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this.change(value)
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this.setFinishCurrent(value)
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},
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list() {
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this.$nextTick(() => {
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this.init()
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})
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}
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},
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mounted() {
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this.init()
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},
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methods: {
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// 初始化
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async init() {
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await this.getTabsInfo()
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this.countLine3Dx()
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this.getQuery(() => {
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this.setScrollViewToCenter()
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})
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// 获取渐变颜色数组
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this.colorGradientArr = this.$t.color.colorGradient(this.inactiveColor, this.activeColor, this.colorStep)
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},
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// 发送事件
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emit(index) {
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this.$emit('change', index)
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},
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// tabs发生变化
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change() {
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this.setScrollViewToCenter()
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},
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// 获取各个tab的节点信息
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getTabsInfo() {
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return new Promise((resolve, reject) => {
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let view = uni.createSelectorQuery().in(this)
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for (let i = 0; i < this.list.length; i++) {
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view.select('#tn-tabs-swiper__scroll-view__item-'+i).boundingClientRect()
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}
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view.exec(res => {
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const arr = []
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for (let i = 0; i < res.length; i++) {
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// 添加颜色属性
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res[i].color = this.inactiveColor
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if (i === this.currentIndex) res[i].color = this.activeColor
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arr.push(res[i])
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}
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this.tabsInfo = arr
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resolve()
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})
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})
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},
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// 查询components信息
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getQuery(cb) {
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try {
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let view = uni.createSelectorQuery().in(this).select('.tn-tabs-swiper')
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view.fields({
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size: true
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},
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data => {
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if (data) {
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this.componentsWidth = data.width
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if (cb && typeof cb === 'function') cb(data)
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} else {
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this.getQuery(cb)
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}
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}
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).exec()
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} catch (e) {
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this.componentsWidth = windowWidth
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}
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},
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// 当swiper滑动结束的时候，计算滑块最终停留的位置
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countLine3Dx() {
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const tab = this.tabsInfo[this.animationFinishCurrent]
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// 让滑块中心点和当前tab中心重合
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if (tab) this.tabLineDx = tab.left + tab.width / 2 - this.barWidthPx / 2 - this.tabsInfo[0].left
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},
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// 把活动的tab移动到屏幕中心
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setScrollViewToCenter() {
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let tab = this.tabsInfo[this.animationFinishCurrent]
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if (tab) {
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let tabCenter = tab.left + tab.width / 2
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let parentWidth
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// 活动tab移动到中心时，以屏幕还是tab组件宽度为基准
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if (this.autoCenterMode === 'window') {
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parentWidth = windowWidth
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} else {
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parentWidth = this.componentsWidth
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}
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this.scrollLeft = tabCenter - parentWidth / 2
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}
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},
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// 设置偏移位置
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setDx(dx) {
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// 计算下一个标签的步进值
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let nextIndexStep = Math.ceil(Math.abs(dx / this.swiperWidthPx))
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let nextTabIndex = dx > 0 ? this.animationFinishCurrent + 1 : this.animationFinishCurrent - 1
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// 处理索引超出边界问题
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nextTabIndex = nextTabIndex <= 0 ? 0 : nextTabIndex
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nextTabIndex = nextTabIndex >= this.list.length ? this.list.length - 1 : nextTabIndex
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// 当前tab中心点x轴坐标
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let currentTab = this.tabsInfo[this.animationFinishCurrent]
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let currentTabX = currentTab.left + currentTab.width / 2
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// 下一个tab中心点x轴坐标
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let nextTab = this.tabsInfo[nextTabIndex]
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let nextTabX = nextTab.left + nextTab.width / 2
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// 两个tab之间的距离
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let distanceX = Math.abs(nextTabX - currentTabX)
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this.tabLineAddDx = (dx / this.swiperWidthPx) * distanceX
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this.setTabColor(this.animationFinishCurrent, nextTabIndex, dx)
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},
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// 设置tab的颜色
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setTabColor(currentTabIndex, nextTabIndex, dx) {
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let nextIndexStep = Math.ceil(Math.abs(dx / this.swiperWidthPx))
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if (Math.abs(dx) > this.swiperWidthPx) {
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dx = dx > 0 ? dx - (this.swiperWidthPx * (nextIndexStep - 1)) : dx + (this.swiperWidthPx * (nextIndexStep - 1))
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}
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let colorIndex = Math.abs(Math.ceil((dx / this.swiperWidthPx) * 100))
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let colorLength = this.colorGradientArr.length
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// 处理超出索引边界
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colorIndex = colorIndex >= colorLength ? colorLength - 1 : colorIndex <= 0 ? 0 : colorIndex
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if (nextIndexStep > 1) {
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// 设置下一个tab的颜色
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// 设置之前tab的颜色为默认颜色
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if (dx > 0) {
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this.tabsInfo[nextTabIndex + (nextIndexStep - 1) > this.tabsInfo.length - 1 ? this.tabsInfo.length - 1 : nextTabIndex + (nextIndexStep - 1)].color = this.colorGradientArr[colorIndex]
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this.tabsInfo[nextTabIndex + (nextIndexStep - 2) > this.tabsInfo.length - 1 ? this.tabsInfo.length - 1 : nextTabIndex + (nextIndexStep - 2)].color = this.colorGradientArr[colorLength - 1 - colorIndex]
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} else {
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this.tabsInfo[nextTabIndex - (nextIndexStep - 1) < 0 ? 0 : nextTabIndex - (nextIndexStep - 1)].color = this.colorGradientArr[colorIndex]
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this.tabsInfo[nextTabIndex - (nextIndexStep - 2) < 0 ? 0 : nextTabIndex - (nextIndexStep - 2)].color = this.colorGradientArr[colorLength - 1 - colorIndex]
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}
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} else {
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// 设置下一个tab的颜色
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this.tabsInfo[nextTabIndex].color = this.colorGradientArr[colorIndex]
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// 设置当前tab的颜色
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this.tabsInfo[currentTabIndex].color = this.colorGradientArr[colorLength - 1 - colorIndex]
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}
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},
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// swiper滑动结束
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setFinishCurrent(current) {
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// 如果滑动的索引不一致，修改tab颜色变化，因为可能会有直接点击tab的情况
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this.tabsInfo.map((item, index) => {
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if (current == index) item.color = this.activeColor
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else item.color = this.inactiveColor
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return item
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})
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this.tabLineAddDx = 0
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this.animationFinishCurrent = current
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this.countLine3Dx()
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}
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}
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}
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</script>
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<style lang="scss" scoped>
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/* #ifndef APP-NVUE */
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::-webkit-scrollbar {
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display: none;
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width: 0 !important;
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height: 0 !important;
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-webkit-appearance: none;
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background: transparent;
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}
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/* #endif */
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/* #ifdef H5 */
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// 通过样式穿透，隐藏H5下，scroll-view下的滚动条
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scroll-view ::v-deep ::-webkit-scrollbar {
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display: none;
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width: 0 !important;
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height: 0 !important;
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-webkit-appearance: none;
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background: transparent;
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}
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/* #endif */
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.tn-tabs-swiper {
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&__scroll-view {
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position: relative;
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width: 100%;
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white-space: nowrap;
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&__box {
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position: relative;
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/* #ifdef MP-TOUTIAO */
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white-space: nowrap;
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/* #endif */
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}
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&__item {
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position: relative;
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/* #ifndef APP-NVUE */
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display: inline-block;
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/* #endif */
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text-align: center;
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transition-property: background-color, color;
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}
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&--flex {
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display: flex;
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flex-direction: row;
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justify-content: space-between;
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}
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}
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&__bar {
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position: absolute;
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bottom: 0;
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}
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}
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</style>
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