474 lines
14 KiB
Vue
474 lines
14 KiB
Vue
<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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{{ 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 {
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windowWidth
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} = uni.getSystemInfoSync();
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const preId = 'UEl_';
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/**
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* tabsSwiper 全屏选项卡
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* @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。
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* @tutorial https://www.uviewui.com/components/tabsSwiper.html
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* @property {Boolean} is-scroll tabs是否可以左右拖动（默认true）
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* @property {Array} list 标签数组，元素为对象，如[{name: '推荐'}]
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* @property {String Number} current 指定哪个tab为激活状态（默认0）
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* @property {String Number} height 导航栏的高度，单位rpx（默认80）
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* @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）
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* @property {String} active-color 滑块和激活tab文字的颜色（默认#2979ff）
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* @property {String} inactive-color tabs文字颜色（默认#303133）
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* @property {String Number} bar-width 滑块宽度，单位rpx（默认40）
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* @property {String Number} bar-height 滑块高度，单位rpx（默认6）
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* @property {Object} bar-style 底部滑块的样式，对象形式
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* @property {Object} active-item-style 活动tabs item的样式，对象形式
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* @property {Boolean} show-bar 是否显示底部的滑块（默认true）
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* @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 {Boolean} bold 激活选项的字体是否加粗（默认true）
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* @event {Function} change 点击标签时触发
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* @example <u-tabs-swiper ref="tabs" :list="list" :is-scroll="false"></u-tabs-swiper>
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*/
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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
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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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//需循环的标签列表
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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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// 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
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height: {
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type: [Number, String],
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default: 80
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},
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// 字体大小，单位rpx
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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
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// duration: {
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// type: [Number, String],
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// default: 0.5
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// },
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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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},
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// 未选中项的颜色
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inactiveColor: {
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type: String,
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default: '#303133'
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},
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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],
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default: 40
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},
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// 移动bar的高度
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barHeight: {
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type: [Number, String],
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default: 6
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},
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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: {
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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
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zIndex: {
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type: [Number, String],
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default: 1
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},
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// 导航栏的背景颜色
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bgColor: {
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type: String,
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default: '#ffffff'
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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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// 读取传入的数组对象的属性
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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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// 活动tab字体是否加粗
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bold: {
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type: Boolean,
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default: true
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},
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// 当前活动tab item的样式
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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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// 是否显示底部的滑块
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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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// 底部滑块的自定义样式
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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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},
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data() {
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return {
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scrollLeft: 0, // 滚动scroll-view的左边滚动距离
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tabQueryInfo: [], // 存放对tab菜单查询后的节点信息
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windowWidth: 0, // 屏幕宽度，单位为px
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//scrollBarLeft: 0, // 移动bar需要通过translateX()移动的距离
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animationFinishCurrent: this.current,
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componentsWidth: 0,
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line3AddDx: 0,
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line3Dx: 0,
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preId,
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sW: 0,
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tabsInfo: [],
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colorGradientArr: [],
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colorStep: 100 // 两个颜色之间的渐变等分
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};
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},
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computed: {
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// 获取当前活跃的current值
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getCurrent() {
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const current = Number(this.current);
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// 判断是否超出边界
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if (current > this.getTabs.length - 1) {
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return this.getTabs.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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getTabs() {
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return this.list;
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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.line3Dx) + Number(this.line3AddDx);
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},
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// 滑块的宽度转为px单位
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barWidthPx() {
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return uni.upx2px(this.barWidth);
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},
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// tab的样式
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tabItemStyle() {
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return (index) => {
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let style = {
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height: this.height + 'rpx',
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lineHeight: this.height + 'rpx',
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padding: `0 ${this.gutter / 2}rpx`,
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color: this.tabsInfo.length > 0 ? (this.tabsInfo[index] ? this.tabsInfo[index].color : this.activeColor) : this.inactiveColor,
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fontSize: this.fontSize + 'rpx',
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zIndex: this.zIndex + 2,
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fontWeight: (index == this.getCurrent && this.bold) ? 'bold' : 'normal'
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};
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if(index == this.getCurrent) {
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// 给选中的tab item添加外部自定义的样式
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style = 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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// 底部滑块的样式
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tabBarStyle() {
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let style = {
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width: this.barWidthPx + 'px',
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height: this.barHeight + 'rpx',
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borderRadius: '100px',
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backgroundColor: this.activeColor,
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left: this.scrollBarLeft + 'px'
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};
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return Object.assign(style, this.barStyle);
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}
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},
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watch: {
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current(n, o) {
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this.change(n);
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this.setFinishCurrent(n);
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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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async init() {
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this.countPx();
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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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// 颜色渐变过程数组
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this.colorGradientArr = color.colorGradient(this.inactiveColor, this.activeColor, this.colorStep);
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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('.' + preId + 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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// 给每个tab添加其文字颜色属性
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res[i].color = this.inactiveColor;
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// 当前tab直接赋予activeColor
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if (i == this.getCurrent) 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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// 当swiper滑动结束，计算滑块最终要停留的位置
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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.line3Dx = tab.left + tab.width / 2 - this.barWidthPx / 2 - this.tabsInfo[0].left;
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},
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countPx() {
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// swiper宽度由rpx转为px单位，因为dx等，都是px单位
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this.sW = uni.upx2px(Number(this.swiperWidth));
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},
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emit(index) {
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this.$emit('change', index);
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},
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change() {
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this.setScrollViewToCenter();
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},
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getQuery(cb) {
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try {
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let view = uni.createSelectorQuery().in(this).select('.u-tabs');
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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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// 把活动tab移动到屏幕中心点
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setScrollViewToCenter() {
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let tab;
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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 fatherWidth;
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// 活动tab移动到中心时，以屏幕还是tab组件为宽度为基准
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if (this.autoCenterMode === 'window') {
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fatherWidth = windowWidth;
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} else {
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fatherWidth = this.componentsWidth;
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}
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this.scrollLeft = tabCenter - fatherWidth / 2;
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}
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},
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setDx(dx) {
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let nextTabIndex = dx > 0 ? this.animationFinishCurrent + 1 : this.animationFinishCurrent - 1;
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// 判断索引是否超出边界
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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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const tab = this.tabsInfo[nextTabIndex];
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// 当前tab中心点x轴坐标
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let nowTab = this.tabsInfo[this.animationFinishCurrent];
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let nowTabX = nowTab.left + nowTab.width / 2;
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// 下一个tab
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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，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
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let distanceX = Math.abs(nextTabX - nowTabX);
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this.line3AddDx = (dx / this.sW) * 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(nowTabIndex, nextTabIndex, dx) {
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let colorIndex = Math.abs(Math.ceil((dx / this.sW) * 100));
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let colorLength = this.colorGradientArr.length;
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// 处理超出索引边界的情况
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colorIndex = colorIndex >= colorLength ? colorLength - 1 : colorIndex <= 0 ? 0 : colorIndex;
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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[nowTabIndex].color = this.colorGradientArr[colorLength - 1 - colorIndex];
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},
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// swiper结束滑动
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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((val, index) => {
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if (current == index) val.color = this.activeColor;
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else val.color = this.inactiveColor;
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return val;
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});
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this.line3AddDx = 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 scoped lang="scss">
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@import "../../libs/css/style.components.scss";
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view,
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scroll-view {
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box-sizing: border-box;
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}
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.u-tabs {
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width: 100%;
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transition-property: background-color, color;
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}
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::-webkit-scrollbar,
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::-webkit-scrollbar,
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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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/* #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 /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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.u-scroll-view {
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width: 100%;
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white-space: nowrap;
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position: relative;
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}
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.u-tabs-scroll-box {
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position: relative;
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}
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.u-tabs-scorll-flex {
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display: flex;
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justify-content: space-between;
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}
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.u-tabs-scorll-flex .u-tabs-item {
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flex: 1;
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}
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.u-tabs-item {
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position: relative;
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display: inline-block;
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text-align: center;
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transition-property: background-color, color, font-weight;
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}
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.content {
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overflow: hidden;
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white-space: nowrap;
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text-overflow: ellipsis;
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}
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.boxStyle {
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pointer-events: none;
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position: absolute;
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transition-property: all;
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}
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.boxStyle2 {
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pointer-events: none;
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position: absolute;
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bottom: 0;
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transition-property: all;
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transform: translateY(-100%);
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}
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.itemBackgroundBox {
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pointer-events: none;
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position: absolute;
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top: 0;
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transition-property: left, background-color;
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display: flex;
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flex-direction: row;
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justify-content: center;
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align-items: center;
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}
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.itemBackground {
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height: 100%;
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width: 100%;
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transition-property: all;
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}
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.u-scroll-bar {
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position: absolute;
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bottom: 4rpx;
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}
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</style>
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