| <template> | 
|     <view class="u-tabs" :style="{ | 
|             zIndex: zIndex, | 
|             background: bgColor | 
|         }"> | 
|         <scroll-view scroll-x class="u-scroll-view" :scroll-left="scrollLeft" scroll-with-animation :style="{ zIndex: zIndex + 1 }"> | 
|             <view class="u-tabs-scroll-box" :class="{'u-tabs-scorll-flex': !isScroll}"> | 
|                 <view class="u-tabs-item" :style="[tabItemStyle(index)]" | 
|                  v-for="(item, index) in getTabs" :key="index" :class="[preId + index]" @tap="emit(index)"> | 
|                     <u-badge :count="item[count] || item['count'] || 0" :offset="offset" size="mini"></u-badge> | 
|                     {{ item[name] || item['name']}} | 
|                 </view> | 
|                 <view v-if="showBar" class="u-scroll-bar" :style="[tabBarStyle]"></view> | 
|             </view> | 
|         </scroll-view> | 
|     </view> | 
| </template> | 
|   | 
| <script> | 
|     import colorGradient from '../../libs/function/colorGradient'; | 
|     let color = colorGradient; | 
|     const { windowWidth } = uni.getSystemInfoSync(); | 
|     const preId = 'UEl_'; | 
|   | 
|     /** | 
|      * tabsSwiper 全屏选项卡 | 
|      * @description 该组件内部实现主要依托于uniapp的scroll-view和swiper组件,主要特色是切换过程中,tabsSwiper文字的颜色可以渐变,底部滑块可以 跟随式滑动,活动tab滚动居中等。应用场景可以用于需要左右切换页面,比如商城的订单中心(待收货-待付款-待评价-已退货)等应用场景。 | 
|      * @tutorial https://www.uviewui.com/components/tabsSwiper.html | 
|      * @property {Boolean} is-scroll tabs是否可以左右拖动(默认true) | 
|      * @property {Array} list 标签数组,元素为对象,如[{name: '推荐'}] | 
|      * @property {String Number} current 指定哪个tab为激活状态(默认0) | 
|      * @property {String Number} height 导航栏的高度,单位rpx(默认80) | 
|      * @property {String Number} font-size tab文字大小,单位rpx(默认30) | 
|      * @property {String Number} swiper-width tabs组件外部swiper的宽度,默认为屏幕宽度,单位rpx(默认750) | 
|      * @property {String} active-color 滑块和激活tab文字的颜色(默认#2979ff) | 
|      * @property {String} inactive-color tabs文字颜色(默认#303133) | 
|      * @property {String Number} bar-width 滑块宽度,单位rpx(默认40) | 
|      * @property {String Number} bar-height 滑块高度,单位rpx(默认6) | 
|      * @property {Object} bar-style 底部滑块的样式,对象形式 | 
|      * @property {Object} active-item-style 活动tabs item的样式,对象形式 | 
|      * @property {Boolean} show-bar 是否显示底部的滑块(默认true) | 
|      * @property {String Number} gutter 单个tab标签的左右内边距之和,单位rpx(默认40) | 
|      * @property {String} bg-color tabs导航栏的背景颜色(默认#ffffff) | 
|      * @property {String} name 组件内部读取的list参数中的属性名,见官网说明(默认name) | 
|      * @property {String} count 组件内部读取的list参数中的属性名(badge徽标数),同name属性的使用,见官网说明(默认count) | 
|      * @property {Array} offset 设置badge徽标数的位置偏移,格式为 [x, y],也即设置的为top和right的值,单位rpx(默认[5, 20]) | 
|      * @property {Boolean} bold 激活选项的字体是否加粗(默认true) | 
|      * @event {Function} change 点击标签时触发 | 
|      * @example <u-tabs-swiper ref="tabs" :list="list" :is-scroll="false"></u-tabs-swiper> | 
|      */ | 
|     export default { | 
|         name: "u-tabs-swiper", | 
|         props: { | 
|             // 导航菜单是否需要滚动,如只有2或者3个的时候,就不需要滚动了,此时使用flex平分tab的宽度 | 
|             isScroll: { | 
|                 type: Boolean, | 
|                 default: true | 
|             }, | 
|             //需循环的标签列表 | 
|             list: { | 
|                 type: Array, | 
|                 default () { | 
|                     return []; | 
|                 } | 
|             }, | 
|             // 当前活动tab的索引 | 
|             current: { | 
|                 type: [Number, String], | 
|                 default: 0 | 
|             }, | 
|             // 导航栏的高度和行高,单位rpx | 
|             height: { | 
|                 type: [Number, String], | 
|                 default: 80 | 
|             }, | 
|             // 字体大小,单位rpx | 
|             fontSize: { | 
|                 type: [Number, String], | 
|                 default: 30 | 
|             }, | 
|             // 过渡动画时长, 单位s | 
|             // duration: { | 
|             //     type: [Number, String], | 
|             //     default: 0.5 | 
|             // }, | 
|             swiperWidth: { | 
|                 //line3生效, 外部swiper的宽度, 单位rpx | 
|                 type: [String, Number], | 
|                 default: 750 | 
|             }, | 
|             // 选中项的主题颜色 | 
|             activeColor: { | 
|                 type: String, | 
|                 default: '#2979ff' | 
|             }, | 
|             // 未选中项的颜色 | 
|             inactiveColor: { | 
|                 type: String, | 
|                 default: '#303133' | 
|             }, | 
|             // 菜单底部移动的bar的宽度,单位rpx | 
|             barWidth: { | 
|                 type: [Number, String], | 
|                 default: 40 | 
|             }, | 
|             // 移动bar的高度 | 
|             barHeight: { | 
|                 type: [Number, String], | 
|                 default: 6 | 
|             }, | 
|             // 单个tab的左或右内边距(各占一半),单位rpx | 
|             gutter: { | 
|                 type: [Number, String], | 
|                 default: 40 | 
|             }, | 
|             // 如果是绝对定位,添加z-index值 | 
|             zIndex: { | 
|                 type: [Number, String], | 
|                 default: 1 | 
|             }, | 
|             // 导航栏的背景颜色 | 
|             bgColor: { | 
|                 type: String, | 
|                 default: '#ffffff' | 
|             }, | 
|             //滚动至中心目标类型 | 
|             autoCenterMode: { | 
|                 type: String, | 
|                 default: 'window' | 
|             }, | 
|             // 读取传入的数组对象的属性(tab名称) | 
|             name: { | 
|                 type: String, | 
|                 default: 'name' | 
|             }, | 
|             // 读取传入的数组对象的属性(徽标数) | 
|             count: { | 
|                 type: String, | 
|                 default: 'count' | 
|             }, | 
|             // 徽标数位置偏移 | 
|             offset: { | 
|                 type: Array, | 
|                 default: () => { | 
|                     return [5, 20] | 
|                 } | 
|             }, | 
|             // 活动tab字体是否加粗 | 
|             bold: { | 
|                 type: Boolean, | 
|                 default: true | 
|             }, | 
|             // 当前活动tab item的样式 | 
|             activeItemStyle: { | 
|                 type: Object, | 
|                 default() { | 
|                     return {} | 
|                 } | 
|             }, | 
|             // 是否显示底部的滑块 | 
|             showBar: { | 
|                 type: Boolean, | 
|                 default: true | 
|             }, | 
|             // 底部滑块的自定义样式 | 
|             barStyle: { | 
|                 type: Object, | 
|                 default() { | 
|                     return {} | 
|                 } | 
|             } | 
|         }, | 
|         data() { | 
|             return { | 
|                 scrollLeft: 0, // 滚动scroll-view的左边滚动距离 | 
|                 tabQueryInfo: [], // 存放对tab菜单查询后的节点信息 | 
|                 windowWidth: 0, // 屏幕宽度,单位为px | 
|                 //scrollBarLeft: 0, // 移动bar需要通过translateX()移动的距离 | 
|                 animationFinishCurrent: this.current, | 
|                 componentsWidth: 0, | 
|                 line3AddDx: 0, | 
|                 line3Dx: 0, | 
|                 preId, | 
|                 sW: 0, | 
|                 tabsInfo: [], | 
|                 colorGradientArr: [], | 
|                 colorStep: 100 // 两个颜色之间的渐变等分 | 
|             }; | 
|         }, | 
|         computed: { | 
|             // 获取当前活跃的current值 | 
|             getCurrent() { | 
|                 const current = Number(this.current); | 
|                 // 判断是否超出边界 | 
|                 if (current > this.getTabs.length - 1) { | 
|                     return this.getTabs.length - 1; | 
|                 } | 
|                 if (current < 0) return 0; | 
|                 return current; | 
|             }, | 
|             getTabs() { | 
|                 return this.list; | 
|             }, | 
|             // 滑块需要移动的距离 | 
|             scrollBarLeft() { | 
|                 return Number(this.line3Dx) + Number(this.line3AddDx); | 
|             }, | 
|             // 滑块的宽度转为px单位 | 
|             barWidthPx() { | 
|                 return uni.upx2px(this.barWidth); | 
|             }, | 
|             // tab的样式 | 
|             tabItemStyle() { | 
|                 return (index) => { | 
|                     let style = { | 
|                         height: this.height + 'rpx', | 
|                         lineHeight: this.height + 'rpx', | 
|                         padding: `0 ${this.gutter / 2}rpx`, | 
|                         color: this.tabsInfo.length > 0 ? (this.tabsInfo[index] ? this.tabsInfo[index].color : this.activeColor) : this.inactiveColor, | 
|                         fontSize: this.fontSize + 'rpx', | 
|                         zIndex: this.zIndex + 2, | 
|                         fontWeight: (index == this.getCurrent && this.bold) ? 'bold' : 'normal' | 
|                     }; | 
|                     if(index == this.getCurrent) { | 
|                         // 给选中的tab item添加外部自定义的样式 | 
|                         style = Object.assign(style, this.activeItemStyle); | 
|                     } | 
|                     return style; | 
|                 } | 
|             }, | 
|             // 底部滑块的样式 | 
|             tabBarStyle() { | 
|                 let style = { | 
|                     width: this.barWidthPx + 'px', | 
|                     height: this.barHeight + 'rpx', | 
|                     borderRadius: '100px', | 
|                     backgroundColor: this.activeColor, | 
|                     left: this.scrollBarLeft + 'px' | 
|                 }; | 
|                 return Object.assign(style, this.barStyle); | 
|             } | 
|         }, | 
|         watch: { | 
|             current(n, o) { | 
|                 this.change(n); | 
|                 this.setFinishCurrent(n); | 
|             }, | 
|             list() { | 
|                 this.$nextTick(() => { | 
|                     this.init(); | 
|                 }) | 
|             } | 
|         }, | 
|         mounted() { | 
|             this.init(); | 
|         }, | 
|         methods: { | 
|             async init() { | 
|                 this.countPx(); | 
|                 await this.getTabsInfo(); | 
|                 this.countLine3Dx(); | 
|                 this.getQuery(() => { | 
|                     this.setScrollViewToCenter(); | 
|                 }); | 
|                 // 颜色渐变过程数组 | 
|                 this.colorGradientArr = color.colorGradient(this.inactiveColor, this.activeColor, this.colorStep); | 
|             }, | 
|             // 获取各个tab的节点信息 | 
|             getTabsInfo() { | 
|                 return new Promise((resolve, reject) => { | 
|                     let view = uni.createSelectorQuery().in(this); | 
|                     for (let i = 0; i < this.list.length; i++) { | 
|                         view.select('.' + preId + i).boundingClientRect(); | 
|                     } | 
|                     view.exec(res => { | 
|                         const arr = []; | 
|                         for (let i = 0; i < res.length; i++) { | 
|                             // 给每个tab添加其文字颜色属性 | 
|                             res[i].color = this.inactiveColor; | 
|                             // 当前tab直接赋予activeColor | 
|                             if (i == this.getCurrent) res[i].color = this.activeColor; | 
|                             arr.push(res[i]); | 
|                         } | 
|                         this.tabsInfo = arr; | 
|                         resolve(); | 
|                     }); | 
|                 }) | 
|             }, | 
|             // 当swiper滑动结束,计算滑块最终要停留的位置 | 
|             countLine3Dx() { | 
|                 const tab = this.tabsInfo[this.animationFinishCurrent]; | 
|                 // 让滑块中心点和当前tab中心重合 | 
|                 if (tab) this.line3Dx = tab.left + tab.width / 2 - this.barWidthPx / 2 - this.tabsInfo[0].left; | 
|             }, | 
|             countPx() { | 
|                 // swiper宽度由rpx转为px单位,因为dx等,都是px单位 | 
|                 this.sW = uni.upx2px(Number(this.swiperWidth)); | 
|             }, | 
|             emit(index) { | 
|                 this.$emit('change', index); | 
|             }, | 
|             change() { | 
|                 this.setScrollViewToCenter(); | 
|             }, | 
|             getQuery(cb) { | 
|                 try { | 
|                     let view = uni.createSelectorQuery().in(this).select('.u-tabs'); | 
|                     view.fields({ | 
|                             size: true | 
|                         }, | 
|                         data => { | 
|                             if (data) { | 
|                                 this.componentsWidth = data.width; | 
|                                 if (cb && typeof cb === 'function') cb(data); | 
|                             } else { | 
|                                 this.getQuery(cb); | 
|                             } | 
|                         } | 
|                     ).exec(); | 
|                 } catch (e) { | 
|                     this.componentsWidth = windowWidth; | 
|                 } | 
|             }, | 
|             // 把活动tab移动到屏幕中心点 | 
|             setScrollViewToCenter() { | 
|                 let tab; | 
|                 tab = this.tabsInfo[this.animationFinishCurrent]; | 
|                 if (tab) { | 
|                     let tabCenter = tab.left + tab.width / 2; | 
|                     let fatherWidth; | 
|                     // 活动tab移动到中心时,以屏幕还是tab组件为宽度为基准 | 
|                     if (this.autoCenterMode === 'window') { | 
|                         fatherWidth = windowWidth; | 
|                     } else { | 
|                         fatherWidth = this.componentsWidth; | 
|                     } | 
|                     this.scrollLeft = tabCenter - fatherWidth / 2; | 
|                 } | 
|             }, | 
|             setDx(dx) { | 
|                 let nextTabIndex = dx > 0 ? this.animationFinishCurrent + 1 : this.animationFinishCurrent - 1; | 
|                 // 判断索引是否超出边界 | 
|                 nextTabIndex = nextTabIndex <= 0 ? 0 : nextTabIndex; | 
|                 nextTabIndex = nextTabIndex >= this.list.length ? this.list.length - 1 : nextTabIndex; | 
|                 const tab = this.tabsInfo[nextTabIndex]; | 
|                 // 当前tab中心点x轴坐标 | 
|                 let nowTab = this.tabsInfo[this.animationFinishCurrent]; | 
|                 let nowTabX = nowTab.left + nowTab.width / 2; | 
|                 // 下一个tab | 
|                 let nextTab = this.tabsInfo[nextTabIndex]; | 
|                 let nextTabX = nextTab.left + nextTab.width / 2; | 
|                 // 两个tab之间的距离,因为下一个tab可能在当前tab的左边或者右边,取绝对值即可 | 
|                 let distanceX = Math.abs(nextTabX - nowTabX); | 
|                 this.line3AddDx = (dx / this.sW) * distanceX; | 
|                 this.setTabColor(this.animationFinishCurrent, nextTabIndex, dx); | 
|             }, | 
|             // 设置tab的颜色 | 
|             setTabColor(nowTabIndex, nextTabIndex, dx) { | 
|                 let colorIndex = Math.abs(Math.ceil((dx / this.sW) * 100)); | 
|                 let colorLength = this.colorGradientArr.length; | 
|                 // 处理超出索引边界的情况 | 
|                 colorIndex = colorIndex >= colorLength ? colorLength - 1 : colorIndex <= 0 ? 0 : colorIndex; | 
|                 // 设置下一个tab的颜色 | 
|                 this.tabsInfo[nextTabIndex].color = this.colorGradientArr[colorIndex]; | 
|                 // 设置当前tab的颜色 | 
|                 this.tabsInfo[nowTabIndex].color = this.colorGradientArr[colorLength - 1 - colorIndex]; | 
|             }, | 
|             // swiper结束滑动 | 
|             setFinishCurrent(current) { | 
|                 // 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 | 
|                 this.tabsInfo.map((val, index) => { | 
|                     if (current == index) val.color = this.activeColor; | 
|                     else val.color = this.inactiveColor; | 
|                     return val; | 
|                 }); | 
|                 this.line3AddDx = 0; | 
|                 this.animationFinishCurrent = current; | 
|                 this.countLine3Dx(); | 
|             } | 
|         } | 
|     }; | 
| </script> | 
|   | 
| <style scoped lang="scss"> | 
|     @import "../../libs/css/style.components.scss"; | 
|   | 
|     view, | 
|     scroll-view { | 
|         box-sizing: border-box; | 
|     } | 
|   | 
|     .u-tabs { | 
|         width: 100%; | 
|         transition-property: background-color, color; | 
|     } | 
|   | 
|     /* #ifndef APP-NVUE */ | 
|     ::-webkit-scrollbar, | 
|     ::-webkit-scrollbar, | 
|     ::-webkit-scrollbar { | 
|         display: none; | 
|         width: 0 !important; | 
|         height: 0 !important; | 
|         -webkit-appearance: none; | 
|         background: transparent; | 
|     } | 
|     /* #endif */ | 
|   | 
|     /* #ifdef H5 */ | 
|     // 通过样式穿透,隐藏H5下,scroll-view下的滚动条 | 
|     scroll-view ::v-deep ::-webkit-scrollbar { | 
|         display: none; | 
|         width: 0 !important; | 
|         height: 0 !important; | 
|         -webkit-appearance: none; | 
|         background: transparent; | 
|     } | 
|   | 
|     /* #endif */ | 
|   | 
|     .u-scroll-view { | 
|         width: 100%; | 
|         white-space: nowrap; | 
|         position: relative; | 
|     } | 
|   | 
|     .u-tabs-scroll-box { | 
|         position: relative; | 
|     } | 
|   | 
|     .u-tabs-scorll-flex { | 
|         @include vue-flex; | 
|         justify-content: space-between; | 
|     } | 
|   | 
|     .u-tabs-scorll-flex .u-tabs-item { | 
|         flex: 1; | 
|     } | 
|   | 
|     .u-tabs-item { | 
|         position: relative; | 
|         display: inline-block; | 
|         text-align: center; | 
|         transition-property: background-color, color, font-weight; | 
|     } | 
|   | 
|     .content { | 
|         overflow: hidden; | 
|         white-space: nowrap; | 
|         text-overflow: ellipsis; | 
|     } | 
|   | 
|     .boxStyle { | 
|         pointer-events: none; | 
|         position: absolute; | 
|         transition-property: all; | 
|     } | 
|   | 
|     .boxStyle2 { | 
|         pointer-events: none; | 
|         position: absolute; | 
|         bottom: 0; | 
|         transition-property: all; | 
|         transform: translateY(-100%); | 
|     } | 
|   | 
|     .itemBackgroundBox { | 
|         pointer-events: none; | 
|         position: absolute; | 
|         top: 0; | 
|         transition-property: left, background-color; | 
|         @include vue-flex; | 
|         flex-direction: row; | 
|         justify-content: center; | 
|         align-items: center; | 
|     } | 
|   | 
|     .itemBackground { | 
|         height: 100%; | 
|         width: 100%; | 
|         transition-property: all; | 
|     } | 
|   | 
|     .u-scroll-bar { | 
|         position: absolute; | 
|         bottom: 4rpx; | 
|     } | 
| </style> |