429 lines
16 KiB
Vue
429 lines
16 KiB
Vue
<template>
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<view class="tabs">
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<u-sticky :enable="isFixed" :bg-color="stickyBgColor" :offset-top="top" :h5-nav-height="0">
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<view :id="id" :style="{
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background: bgColor,
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'border-radius': borderRadius,
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width: width,
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margin: '0 auto'
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}">
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<scroll-view :style="{height: height + 'rpx'}" scroll-x class="scroll-view" :scroll-left="scrollLeft"
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scroll-with-animation>
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<view class="scroll-box" :class="{'tabs-scorll-flex': !isScroll}">
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<view class="tab-item line1" :id="'tab-item-' + index" v-for="(item, index) in list"
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:key="index" @tap="clickTab(index)" :style="[tabItemStyle(index)]">
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<u-badge :count="item[count] || item['dot'] || 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="tab-bar" :style="[tabBarStyle]"></view>
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</view>
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</scroll-view>
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</view>
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</u-sticky>
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<view class="tab-content">
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<view>
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<slot></slot>
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</view>
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</view>
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</view>
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</template>
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<script>
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import {
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getRect
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} from '@/utils/tools'
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export default {
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name: "tabs",
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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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// 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
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height: {
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type: [String, Number],
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default: 80
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},
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// 字体大小
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fontSize: {
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type: [String, Number],
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default: 28
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},
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// 过渡动画时长, 单位ms
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duration: {
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type: [String, Number],
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default: 0.3
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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: '#FF2C3C'
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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: '#333'
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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: [String, Number],
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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: [String, Number],
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default: 4
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},
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// 单个tab的左或有内边距（左右相同）
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gutter: {
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type: [String, Number],
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default: 30
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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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// 读取传入的数组对象的属性(tab名称)
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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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// 读取传入的数组对象的属性(徽标数)
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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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// 徽标数位置偏移
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offset: {
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type: Array,
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default: () => {
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return [5, 20]
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}
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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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// 标签的宽度
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itemWidth: {
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type: [Number, String],
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default: 'auto'
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},
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isFixed: {
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type: Boolean,
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default: false
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},
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top: {
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type: [Number, String],
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default: 0
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},
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width: {
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type: [Number, String],
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default: '100%'
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},
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stickyBgColor: {
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type: String,
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default: '#ffffff'
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},
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borderRadius: {
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type: [Number, String],
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default: 0
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},
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// 异步使用：需手动更改这个值才能点击
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async: {
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type: Boolean,
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default: false
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}
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},
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provide() {
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return {
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tabs: this
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}
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},
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data() {
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return {
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list: [],
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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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componentWidth: 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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parentLeft: 0, // 父元素(tabs组件)到屏幕左边的距离
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id: 'cu-tab', // id值
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currentIndex: this.current,
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barFirstTimeMove: true, // 滑块第一次移动时(页面刚生成时)，无需动画，否则给人怪异的感觉
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isAsync: false
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};
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},
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watch: {
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// 监听tab的变化，重新计算tab菜单的布局信息，因为实际使用中菜单可能是通过
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// 后台获取的（如新闻app顶部的菜单），获取返回需要一定时间，所以list变化时，重新获取布局信息
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list(n, o) {
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// list变动时，重制内部索引，否则可能导致超出数组边界的情况
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if (!this.barFirstTimeMove && n.length !== o.length) {
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this.currentIndex = 0;
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}
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// 用$nextTick等待视图更新完毕后再计算tab的局部信息，否则可能因为tab还没生成就获取，就会有问题
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this.$nextTick(() => {
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this.init();
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});
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},
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current: {
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immediate: true,
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handler(nVal, oVal) {
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// 视图更新后再执行移动操作、
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this.$nextTick(() => {
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this.currentIndex = nVal;
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this.scrollByIndex();
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});
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}
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},
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async: {
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immediate: true,
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handler(nVal, oVal) {
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this.isAsync = nVal;
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}
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},
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},
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computed: {
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// 移动bar的样式
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tabBarStyle() {
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let style = {
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width: this.barWidth + 'rpx',
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transform: `translate(${this.scrollBarLeft}px, -100%)`,
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// 滑块在页面渲染后第一次滑动时，无需动画效果
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'transition-duration': `${this.barFirstTimeMove ? 0 : this.duration }s`,
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'background-color': this.activeColor,
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height: this.barHeight + 'rpx',
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opacity: this.barFirstTimeMove ? 0 : 1,
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// 设置一个很大的值，它会自动取能用的最大值，不用高度的一半，是因为高度可能是单数，会有小数出现
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'border-radius': `${this.barHeight / 2}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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// 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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'line-height': this.height + 'rpx',
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'font-size': this.fontSize + 'rpx',
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padding: this.isScroll ? `0 ${this.gutter}rpx` : '',
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flex: this.isScroll ? 'auto' : '1',
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width: `${this.itemWidth}rpx`
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};
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// 字体加粗
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if (index == this.currentIndex && this.bold) style.fontWeight = 'bold';
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if (index == this.currentIndex) {
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style.color = this.activeColor;
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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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} else {
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style.color = this.inactiveColor;
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}
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return style;
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}
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}
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},
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methods: {
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updateTabs() {
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this.list = this.childrens.map((item) => {
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const {
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name,
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dot,
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active,
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inited,
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updateRender
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} = item
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return {
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name,
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dot,
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active,
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inited,
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updateRender
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}
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})
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this.$nextTick(function() {
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this.init()
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})
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},
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// 设置一个init方法，方便多处调用
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async init() {
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// 获取tabs组件的尺寸信息
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let tabRect = await getRect('#' + this.id, false, this);
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// tabs组件距离屏幕左边的宽度
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this.parentLeft = tabRect.left;
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// tabs组件的宽度
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this.componentWidth = tabRect.width;
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this.getTabRect();
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},
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// 点击某一个tab菜单
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clickTab(index) {
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// 发送事件给父组件
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this.$emit('change', index);
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// 点击当前活动tab，不触发事件
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if(this.isAsync) return;
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if (index == this.currentIndex) return;
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this.$nextTick(() => {
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this.currentIndex = index;
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this.scrollByIndex();
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});
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},
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// 查询tab的布局信息
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getTabRect() {
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// 创建节点查询
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let query = uni.createSelectorQuery().in(this);
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// 历遍所有tab，这里是执行了查询，最终使用exec()会一次性返回查询的数组结果
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for (let i = 0; i < this.list.length; i++) {
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// 只要size和rect两个参数
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query.select(`#tab-item-${i}`).fields({
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size: true,
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rect: true
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});
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}
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// 执行查询，一次性获取多个结果
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query.exec(
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function(res) {
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this.tabQueryInfo = res;
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// 初始化滚动条和移动bar的位置
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this.scrollByIndex();
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}.bind(this)
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);
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},
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// 滚动scroll-view，让活动的tab处于屏幕的中间位置
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scrollByIndex() {
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// 当前活动tab的布局信息，有tab菜单的width和left(为元素左边界到父元素左边界的距离)等信息
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let tabInfo = this.tabQueryInfo[this.currentIndex];
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if (!tabInfo) return;
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// 活动tab的宽度
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let tabWidth = tabInfo.width;
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// 活动item的左边到tabs组件左边的距离，用item的left减去tabs的left
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let offsetLeft = tabInfo.left - this.parentLeft;
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// 将活动的tabs-item移动到屏幕正中间，实际上是对scroll-view的移动
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let scrollLeft = offsetLeft - (this.componentWidth - tabWidth) / 2;
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this.scrollLeft = scrollLeft < 0 ? 0 : scrollLeft;
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// 当前活动item的中点点到左边的距离减去滑块宽度的一半，即可得到滑块所需的移动距离
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let left = tabInfo.left + tabInfo.width / 2 - this.parentLeft;
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// 计算当前活跃item到组件左边的距离
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this.scrollBarLeft = left - uni.upx2px(this.barWidth) / 2;
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// 第一次移动滑块的时候，barFirstTimeMove为true，放到延时中将其设置false
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// 延时是因为scrollBarLeft作用于computed计算时，需要一个过程需，否则导致出错
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if (this.barFirstTimeMove == true) {
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setTimeout(() => {
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this.barFirstTimeMove = false;
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}, 100)
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}
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// 更新子组件的显示
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this.childrens.forEach((item, ind) => {
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let active = ind === this.currentIndex;
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if (active !== item.active || !item.inited) {
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item.updateRender(active, this);
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}
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});
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}
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},
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created() {
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this.childrens = []
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},
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mounted() {
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this.updateTabs();
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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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::-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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/* #endif */
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.scroll-box {
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height: 100%;
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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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.tab-fixed {
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position: sticky;
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top: 0;
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width: 100%;
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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 ::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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.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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.tab-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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.tab-bar {
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position: absolute;
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bottom: 6rpx;
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}
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.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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</style>
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