447 lines
16 KiB
Vue
447 lines
16 KiB
Vue
<template>
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<view
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v-if="props.show"
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class="u-tabbar"
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:class="customClass"
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:style="$u.toStyle(customStyle)"
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@touchmove.stop.prevent="() => {}"
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>
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<view
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class="u-tabbar__content safe-area-inset-bottom"
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:style="{ height: $u.addUnit(props.height), backgroundColor: props.bgColor, zIndex: uZIndex }"
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:class="{ 'u-border-top': props.borderTop }"
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>
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<view
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class="u-tabbar__content__item"
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v-for="(item, index) in props.list"
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:key="index"
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:class="{ 'u-tabbar__content__circle': props.midButton && item.midButton }"
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@tap.stop="clickHandler(index)"
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:style="{ backgroundColor: props.bgColor }"
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>
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<view
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class="u-tabbar__content__item__container"
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:class="{ 'u-tabbar__content__circle__container': props.midButton && item.midButton }"
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:style="containerStyle(index)"
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>
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<view
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v-if="item.iconPath || item.selectedIconPath"
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:class="[
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props.midButton && item.midButton
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? 'u-tabbar__content__circle__icon'
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: 'u-tabbar__content__item__icon'
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]"
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>
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<u-icon
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:size="getIconSize(index)"
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:name="elIconPath(index)"
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img-mode="scaleToFill"
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:color="elColor(index)"
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:custom-prefix="getCustomPrefix(index)"
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></u-icon>
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<u-badge
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:count="item.count"
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:is-dot="item.isDot"
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v-if="item.count || item.isDot"
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:offset="[
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getBadgeOffsetTop(item.count || 0, item.isDot || false),
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getOffsetRight(item.count || 0, item.isDot || false)
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]"
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></u-badge>
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</view>
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<!-- #ifdef APP-PLUS -->
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<u-gap :height="gap"></u-gap>
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<!-- #endif -->
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<view
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v-if="item.text"
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class="u-tabbar__content__item__text"
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:class="{
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'u-tabbar__content__item__text--center':
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item.text && !(item.iconPath || item.selectedIconPath)
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}"
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>
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<text
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class="u-line-1"
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:style="{ color: elColor(index), fontSize: $u.addUnit(getTextSize(index)) }"
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>
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{{ item.text }}
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</text>
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</view>
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</view>
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</view>
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<view
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v-if="props.midButton"
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class="u-tabbar__content__circle__border"
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:class="{ 'u-border': props.borderTop }"
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:style="{ backgroundColor: props.bgColor, left: midButtonLeft }"
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></view>
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</view>
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<!-- 这里加上一个48rpx的高度,是为了增高有凸起按钮时的防塌陷高度(也即按钮凸出来部分的高度) -->
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<!-- calc 计算0时单位不一致会计算失败，这里+1px -->
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<view
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class="u-fixed-placeholder safe-area-inset-bottom"
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:style="{ height: `calc(${$u.addUnit(props.height)} + ${props.midButton ? '60rpx' : '1px'})` }"
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></view>
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</view>
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</template>
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<script lang="ts">
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export default {
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name: 'u-tabbar',
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options: {
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addGlobalClass: true,
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// #ifndef MP-TOUTIAO
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virtualHost: true,
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// #endif
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styleIsolation: 'shared'
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}
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};
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</script>
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<script setup lang="ts">
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import { ref, computed, onMounted } from 'vue';
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import { $u } from '../..';
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import { TabbarProps } from './types';
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/**
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* u-tabbar 底部导航栏
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* @property {Boolean} show 显示与否
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* @property {String|Number} value 通过v-model绑定current值
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* @property {String} bgColor 整个tabbar的背景颜色
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* @property {String|Number} height tabbar的高度，默认50px，单位任意，如果为数值，则为rpx单位
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* @property {String|Number} iconSize 非凸起图标的大小，单位任意，数值默认rpx
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* @property {String|Number} midButtonSize 凸起的图标的大小，单位任意，数值默认rpx
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* @property {String} activeColor 激活时的演示，包括字体图标，提示文字等的演示
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* @property {String} inactiveColor 未激活时的颜色
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* @property {Boolean} midButton 是否显示中部的凸起按钮
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* @property {Array} list 配置参数
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* @property {Function} beforeSwitch 切换前的回调
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* @property {Boolean} borderTop 是否显示顶部的横线
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* @property {Boolean} hideTabBar 是否隐藏原生tabbar
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* @property {String|Number} gap icon和text的间距，单位任意，数值默认rpx
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*/
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const props = defineProps(TabbarProps);
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const emit = defineEmits<{ (e: 'change', index: number): void; (e: 'update:modelValue', index: number): void }>();
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// 计算z-index值
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const uZIndex = computed(() => props?.zIndex ?? $u.zIndex.tabbar);
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// 由于安卓太菜了，通过css居中凸起按钮的外层元素有误差，故通过js计算将其居中
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const midButtonLeft = ref('50%');
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const pageUrl = ref(''); // 当前页面URL
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onMounted(() => {
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// 是否隐藏原生tabbar
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// 注意：如果当前页面不是tabbar页面，浏览器控制台会报错：{errMsg: 'hideTabBar:fail not TabBar page'}
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// if (props.hideTabBar) uni.hideTabBar();
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// 获取引入了u-tabbar页面的路由地址，该地址没有路径前面的"/"
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const pages = getCurrentPages();
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// 页面栈中的最后一个即为项为当前页面，route属性为页面路径
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pageUrl.value = pages[pages.length - 1].route as string;
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if (props.midButton) getMidButtonLeft();
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});
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/**
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* 计算当前item的icon路径
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*/
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const elIconPath = computed<(index: number) => string | undefined>(() => {
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return (index: number) => {
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// 历遍u-tabbar的每一项item时，判断是否传入了pagePath参数，如果传入了
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// 和data中的pageUrl参数对比，如果相等，即可判断当前的item对应当前的tabbar页面，设置高亮图标
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// 采用这个方法，可以无需使用v-model绑定的value值
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const pagePath = props.list[index]?.pagePath;
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// 如果定义了pagePath属性，意味着使用系统自带tabbar方案，否则使用一个页面用几个组件模拟tabbar页面的方案
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// 这两个方案对处理tabbar item的激活与否方式不一样
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if (pagePath) {
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if (pagePath === pageUrl.value || pagePath === '/' + pageUrl.value) {
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return props.list[index].selectedIconPath;
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} else {
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return props.list[index].iconPath;
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}
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} else {
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// 普通方案中，索引等于v-model值时，即为激活项
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return index == props.modelValue ? props.list[index].selectedIconPath : props.list[index].iconPath;
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}
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};
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});
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/**
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* 计算当前item的颜色
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*/
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const elColor = computed<(index: number) => string>(() => {
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return (index: number) => {
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// 判断方法同理于elIconPath
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const pagePath = props.list[index]?.pagePath;
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if (pagePath) {
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if (pagePath === pageUrl.value || pagePath === '/' + pageUrl.value) return props.activeColor;
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else return props.inactiveColor;
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} else {
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return index == props.modelValue ? props.activeColor : props.inactiveColor;
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}
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};
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});
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/**
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* 计算当前item的custom-prefix
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* customIcon为boolean时：true为"custom-icon"，false为"uicon"
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* customIcon为string时：直接使用该值
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* customIcon为空时：默认"uicon"
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*/
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function getCustomPrefix(index: number): string {
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const customIcon = props.list[index]?.customIcon;
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// 如果为空（undefined/null），返回默认值
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if (customIcon === undefined || customIcon === null || customIcon === '') {
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return 'uicon';
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}
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// 如果是字符串类型，直接返回
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if (typeof customIcon === 'string') {
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return customIcon;
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}
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// 如果是boolean类型
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if (typeof customIcon === 'boolean') {
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return customIcon ? 'custom-icon' : 'uicon';
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}
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// 默认返回uicon
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return 'uicon';
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}
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/**
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* 点击tabbar item
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*/
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async function clickHandler(index: number) {
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if (props.beforeSwitch && typeof props.beforeSwitch === 'function') {
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// 执行回调，同时传入索引当作参数
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let beforeSwitchResult = props.beforeSwitch(index);
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// 判断是否返回了promise
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if (
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typeof beforeSwitchResult === 'object' &&
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beforeSwitchResult !== null &&
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typeof beforeSwitchResult.then === 'function'
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) {
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await beforeSwitchResult
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.then(() => {
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// promise返回成功，
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switchTab(index);
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})
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.catch(() => {});
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} else if (beforeSwitchResult === true) {
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// 如果返回true
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switchTab(index);
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}
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} else {
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switchTab(index);
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}
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}
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/**
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* 切换tab
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*/
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function switchTab(index: number) {
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// 发出事件和修改v-model绑定的值
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emit('change', index);
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// 如果有配置pagePath属性，使用uni.switchTab进行跳转
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if (props.list[index]?.pagePath) {
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uni.switchTab({ url: props.list[index].pagePath as string });
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} else {
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// 如果配置了papgePath属性，将不会双向绑定v-model传入的value值
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// 因为这个模式下，不再需要v-model绑定的value值了，而是通过getCurrentPages()适配
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emit('update:modelValue', index);
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}
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}
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/**
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* 计算角标的right值
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*/
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function getOffsetRight(count: number, isDot: boolean): number {
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// 点类型，count大于9(两位数)，分别设置不同的right值，避免位置太挤
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if (isDot) {
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return -20;
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} else if (count > 9) {
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return -40;
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} else {
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return -30;
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}
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}
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/**
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* 计算角标的top值，在垂直布局下调整位置
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*/
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function getBadgeOffsetTop(count: number, isDot: boolean): number {
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// 在垂直布局下，角标相对于icon的top偏移需要调整
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// 由于icon现在在flex容器中，需要更小的top偏移
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return -2;
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}
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/**
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* 获取单项icon尺寸（单项优先级高于props）
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*/
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function getIconSize(index: number) {
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const item = props.list[index] || {};
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if (props.midButton && item.midButton) {
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return props.midButtonSize;
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}
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if (item.iconSize !== undefined && item.iconSize !== null && item.iconSize !== '') {
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return item.iconSize;
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}
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return props.iconSize;
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}
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/**
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* 获取单项text尺寸（单项优先级高于props）
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*/
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function getTextSize(index: number) {
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const item = props.list[index] || {};
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if (item.textSize !== undefined && item.textSize !== null && item.textSize !== '') {
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return item.textSize;
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}
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return props.textSize;
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}
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/**
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* 获取凸起按钮外层元素的left值，让其水平居中
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*/
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function getMidButtonLeft() {
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const windowWidth = $u.sys().windowWidth;
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// 由于安卓中css计算left: 50%的结果不准确，故用js计算
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midButtonLeft.value = windowWidth / 2 + 'px';
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}
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/**
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* 图标和文字间距
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*/
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function containerStyle(index: number) {
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const style: Record<string, any> = {};
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const item = props.list[index] || {};
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// #ifndef APP-PLUS
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if (item.gap !== undefined && item.gap !== null && item.gap !== '') {
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style.gap = $u.addUnit(item.gap);
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} else {
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style.gap = $u.addUnit(props.gap);
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}
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// #endif
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// 如果是中间凸起按钮，为容器增加上内边距，避免文字被绝对定位的图标遮挡
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if (props.midButton && item.midButton) {
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const iconSizeRaw = getIconSize(index);
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const numericSize = parseFloat(String(iconSizeRaw)) || parseFloat(String(props.midButtonSize as any)) || 100;
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// paddingTop: 半个图标高度 + 10rpx 的缓冲间距
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style.paddingTop = $u.addUnit(numericSize / 2 + 8);
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style.boxSizing = 'border-box';
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}
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return $u.toStyle(style);
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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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.u-fixed-placeholder {
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/* #ifndef APP-NVUE */
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box-sizing: content-box;
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/* #endif */
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height: 50px;
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}
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.u-tabbar {
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&__content {
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@include vue-flex;
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align-items: center;
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position: relative;
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position: fixed;
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bottom: 0;
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left: 0;
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width: 100%;
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z-index: 998;
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/* #ifndef APP-NVUE */
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box-sizing: content-box;
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/* #endif */
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&__circle__border {
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border-radius: 100%;
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width: 130rpx;
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height: 130rpx;
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top: -58rpx;
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position: absolute;
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z-index: 4;
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background-color: var(--u-bg-white);
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// 由于安卓的无能，导致只有3个tabbar item时，此css计算方式有误差
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// 故使用js计算的形式来定位，此处不注释，是因为js计算有延后，避免出现位置闪动
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left: 50%;
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transform: translateX(-50%);
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&:after {
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border-radius: 100px;
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}
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}
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&__item {
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flex: 1;
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justify-content: center;
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height: 100%;
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padding: 12rpx 0;
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@include vue-flex;
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flex-direction: column;
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align-items: center;
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position: relative;
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&__container {
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@include vue-flex;
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flex-direction: column;
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align-items: center;
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justify-content: center;
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height: 100%;
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width: 100%;
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position: relative;
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}
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&__icon {
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position: relative;
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@include vue-flex;
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align-items: center;
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justify-content: center;
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}
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&__text {
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color: $u-content-color;
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font-size: 26rpx;
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line-height: 28rpx;
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text-align: center;
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width: 100%;
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}
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}
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&__circle {
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position: relative;
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@include vue-flex;
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flex-direction: column;
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justify-content: space-between;
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z-index: 10;
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/* #ifndef APP-NVUE */
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height: calc(100% - 1px);
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/* #endif */
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&__container {
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@include vue-flex;
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flex-direction: column;
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align-items: center;
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justify-content: center;
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height: 100%;
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width: 100%;
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position: relative;
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box-sizing: border-box;
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}
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&__icon {
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width: 100rpx;
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height: 100rpx;
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border-radius: 100%;
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@include vue-flex;
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justify-content: center;
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align-items: center;
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background-color: var(--u-bg-white);
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/* 将凸起图标上移，与顶部边框线对齐 */
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position: absolute;
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top: -55rpx;
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left: 50%;
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z-index: 6;
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transform: translateX(-50%);
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}
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}
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}
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}
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</style>
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