<template> 
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    <view class="u-tabs" :style="{ 
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            zIndex: zIndex, 
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            background: bgColor 
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        }"> 
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        <scroll-view scroll-x class="u-scroll-view" :scroll-left="scrollLeft" scroll-with-animation :style="{ zIndex: zIndex + 1 }"> 
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            <view class="u-tabs-scroll-box" :class="{'u-tabs-scorll-flex': !isScroll}"> 
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                <view class="u-tabs-item" :style="[tabItemStyle(index)]" 
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                 v-for="(item, index) in getTabs" :key="index" :class="[preId + index]" @tap="emit(index)"> 
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                    <u-badge :count="item[count] || item['count'] || 0" :offset="offset" size="mini"></u-badge> 
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                    {{ item[name] || item['name']}} 
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                </view> 
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                <view v-if="showBar" class="u-scroll-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 colorGradient from '../../libs/function/colorGradient'; 
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    let color = colorGradient; 
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    const { windowWidth } = uni.getSystemInfoSync(); 
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    const preId = 'UEl_'; 
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 | 
    /** 
 | 
     * 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) 
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     * @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) 
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     * @property {String} bg-color tabs导航栏的背景颜色(默认#ffffff) 
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     * @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) 
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     * @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]) 
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     * @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> 
 | 
     */ 
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    export default { 
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        name: "u-tabs-swiper", 
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        props: { 
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            // 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: { 
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                type: Boolean, 
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                default: true 
 | 
            }, 
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            //需循环的标签列表 
 | 
            list: { 
 | 
                type: Array, 
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                default () { 
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                    return []; 
 | 
                } 
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            }, 
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            // 当前活动tab的索引 
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            current: { 
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                type: [Number, String], 
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                default: 0 
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            }, 
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            // 导航栏的高度和行高,单位rpx 
 | 
            height: { 
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                type: [Number, String], 
 | 
                default: 80 
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            }, 
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            // 字体大小,单位rpx 
 | 
            fontSize: { 
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                type: [Number, String], 
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                default: 30 
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            }, 
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            // 过渡动画时长, 单位s 
 | 
            // duration: { 
 | 
            //     type: [Number, String], 
 | 
            //     default: 0.5 
 | 
            // }, 
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            swiperWidth: { 
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                //line3生效, 外部swiper的宽度, 单位rpx 
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                type: [String, Number], 
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                default: 750 
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            }, 
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            // 选中项的主题颜色 
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            activeColor: { 
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                type: String, 
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                default: '#2979ff' 
 | 
            }, 
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            // 未选中项的颜色 
 | 
            inactiveColor: { 
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                type: String, 
 | 
                default: '#303133' 
 | 
            }, 
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            // 菜单底部移动的bar的宽度,单位rpx 
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            barWidth: { 
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                type: [Number, String], 
 | 
                default: 40 
 | 
            }, 
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            // 移动bar的高度 
 | 
            barHeight: { 
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                type: [Number, String], 
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                default: 6 
 | 
            }, 
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            // 单个tab的左或右内边距(各占一半),单位rpx 
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            gutter: { 
 | 
                type: [Number, String], 
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                default: 40 
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            }, 
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            // 如果是绝对定位,添加z-index值 
 | 
            zIndex: { 
 | 
                type: [Number, String], 
 | 
                default: 1 
 | 
            }, 
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            // 导航栏的背景颜色 
 | 
            bgColor: { 
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                type: String, 
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                default: '#ffffff' 
 | 
            }, 
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            //滚动至中心目标类型 
 | 
            autoCenterMode: { 
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                type: String, 
 | 
                default: 'window' 
 | 
            }, 
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            // 读取传入的数组对象的属性(tab名称) 
 | 
            name: { 
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                type: String, 
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                default: 'name' 
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            }, 
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            // 读取传入的数组对象的属性(徽标数) 
 | 
            count: { 
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                type: String, 
 | 
                default: 'count' 
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            }, 
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            // 徽标数位置偏移 
 | 
            offset: { 
 | 
                type: Array, 
 | 
                default: () => { 
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                    return [5, 20] 
 | 
                } 
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            }, 
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            // 活动tab字体是否加粗 
 | 
            bold: { 
 | 
                type: Boolean, 
 | 
                default: true 
 | 
            }, 
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            // 当前活动tab item的样式 
 | 
            activeItemStyle: { 
 | 
                type: Object, 
 | 
                default() { 
 | 
                    return {} 
 | 
                } 
 | 
            }, 
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            // 是否显示底部的滑块 
 | 
            showBar: { 
 | 
                type: Boolean, 
 | 
                default: true 
 | 
            }, 
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            // 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 { 
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        flex: 1; 
 | 
    } 
 | 
  
 | 
    .u-tabs-item { 
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        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> 
 |