227 lines
6.1 KiB
Vue
227 lines
6.1 KiB
Vue
<template>
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<view class="u-tabbar">
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<view
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class="u-tabbar__content"
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ref="u-tabbar__content"
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@touchmove.stop.prevent=""
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:class="[border && 'u-border-top', fixed && 'u-tabbar--fixed', { 'mid-tabbar': midTabBar }]"
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:style="[tabbarStyle]"
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>
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<view class="u-tabbar__content__item-wrapper">
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<slot></slot>
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</view>
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<view v-if="safeAreaInsetBottom" :style="[{ height: safeBottomHeight + 'px' }]"></view>
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</view>
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<view
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class="u-tabbar__placeholder"
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v-if="placeholder"
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:style="{
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height: placeholderHeight + 'px',
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}"
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></view>
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</view>
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</template>
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<script>
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// #ifdef APP-NVUE
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const dom = uni.requireNativePlugin('dom');
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// #endif
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/**
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* Tabbar 底部导航栏
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* @description 此组件提供了自定义tabbar的能力。
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* @property {String | Number} value 当前匹配项的name
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* @property {Boolean} safeAreaInsetBottom 是否为iPhoneX留出底部安全距离（默认 true ）
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* @property {Boolean} border 是否显示上方边框（默认 true ）
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* @property {String | Number} zIndex 元素层级z-index（默认 1 ）
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* @property {String} activeColor 选中标签的颜色（默认 '#1989fa' ）
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* @property {String} inactiveColor 未选中标签的颜色（默认 '#7d7e80' ）
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* @property {Boolean} fixed 是否固定在底部（默认 true ）
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* @property {Boolean} placeholder fixed定位固定在底部时，是否生成一个等高元素防止塌陷（默认 true ）
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* @property {Object} customStyle 定义需要用到的外部样式
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*
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*/
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import { deepMerge, addStyle, sleep } from '@/sheep/helper';
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import sheep from '@/sheep';
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export default {
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name: 'su-tabbar',
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props: {
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customStyle: {
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type: [Object, String],
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default: () => ({}),
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},
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customClass: {
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type: String,
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default: '',
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},
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// 跳转的页面路径
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url: {
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type: String,
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default: '',
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},
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// 页面跳转的类型
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linkType: {
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type: String,
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default: 'navigateTo',
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},
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// 当前匹配项的name
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value: {
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type: [String, Number, null],
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default: '',
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},
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// 是否为iPhoneX留出底部安全距离
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safeAreaInsetBottom: {
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type: Boolean,
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default: true,
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},
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// 是否显示上方边框
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border: {
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type: Boolean,
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default: true,
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},
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// 元素层级z-index
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zIndex: {
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type: [String, Number],
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default: 10,
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},
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// 选中标签的颜色
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activeColor: {
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type: String,
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default: '#1989fa',
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},
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// 未选中标签的颜色
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inactiveColor: {
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type: String,
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default: '#7d7e80',
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},
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// 是否固定在底部
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fixed: {
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type: Boolean,
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default: true,
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},
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// fixed定位固定在底部时，是否生成一个等高元素防止塌陷
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placeholder: {
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type: Boolean,
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default: true,
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},
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midTabBar: {
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type: Boolean,
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default: false,
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},
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},
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data() {
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return {
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placeholderHeight: 0,
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safeBottomHeight: sheep.$platform.device.safeAreaInsets.bottom,
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};
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},
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computed: {
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tabbarStyle() {
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const style = {
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zIndex: this.zIndex,
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};
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// 合并来自父组件的customStyle样式
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return deepMerge(style, addStyle(this.customStyle));
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},
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// 监听多个参数的变化，通过在computed执行对应的操作
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updateChild() {
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return [this.value, this.activeColor, this.inactiveColor];
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},
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updatePlaceholder() {
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return [this.fixed, this.placeholder];
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},
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},
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watch: {
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updateChild() {
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// 如果updateChildren中的元素发生了变化，则执行子元素初始化操作
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this.updateChildren();
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},
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updatePlaceholder() {
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// 如果fixed，placeholder等参数发生变化，重新计算占位元素的高度
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this.setPlaceholderHeight();
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},
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},
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created() {
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this.children = [];
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},
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mounted() {
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this.setPlaceholderHeight();
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},
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methods: {
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updateChildren() {
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// 如果存在子元素，则执行子元素的updateFromParent进行更新数据
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this.children.length && this.children.map((child) => child.updateFromParent());
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},
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getRect(selector, all) {
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return new Promise((resolve) => {
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uni.createSelectorQuery()
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.in(this)
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[all ? 'selectAll' : 'select'](selector)
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.boundingClientRect((rect) => {
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if (all && Array.isArray(rect) && rect.length) {
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resolve(rect);
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}
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if (!all && rect) {
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resolve(rect);
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}
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})
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.exec();
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});
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},
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// 设置用于防止塌陷元素的高度
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async setPlaceholderHeight() {
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if (!this.fixed || !this.placeholder) return;
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// 延时一定时间
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await sleep(20);
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// #ifndef APP-NVUE
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this.getRect('.u-tabbar__content').then(({ height = 50 }) => {
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// 修复IOS safearea bottom 未填充高度
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this.placeholderHeight = height;
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});
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// #endif
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// #ifdef APP-NVUE
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dom.getComponentRect(this.$refs['u-tabbar__content'], (res) => {
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const { size } = res;
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this.placeholderHeight = size.height;
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});
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// #endif
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},
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},
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};
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</script>
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<style lang="scss" scoped>
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.u-tabbar {
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display: flex;
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flex: 1;
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justify-content: center;
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&__content {
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display: flex;
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flex-direction: column;
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background-color: #fff;
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box-shadow: 0px -2px 4px 0px rgba(51, 51, 51, 0.06);
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&__item-wrapper {
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height: 50px;
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display: flex;
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justify-content: space-around;
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align-items: center;
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}
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}
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.mid-tabbar {
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border-radius: 30rpx 30rpx 0 0;
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}
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&--fixed {
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position: fixed;
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bottom: -1px;
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left: 0;
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right: 0;
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}
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}
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</style>
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