320 lines
9.0 KiB
Vue
320 lines
9.0 KiB
Vue
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<template>
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<view v-if="show" class="u-tabbar" @touchmove.stop.prevent>
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<view class="u-tabbar__content safe-area-inset-bottom" :style="{
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height: $u.addUnit(height),
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backgroundColor: bgColor,
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}" :class="{
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'u-border-top': borderTop
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}">
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<view class="u-tabbar__content__item" v-for="(item, index) in list" :key="index" :class="{
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'u-tabbar__content__circle': midButton &&item.midButton
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}" @tap.stop="clickHandler(index)" :style="{
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backgroundColor: bgColor
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}">
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<view :class="[
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midButton && item.midButton ? 'u-tabbar__content__circle__button' : 'u-tabbar__content__item__button'
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]">
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<u-icon
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:size="midButton && item.midButton ? midButtonSize : iconSize"
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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="item.customIcon ? 'custom-icon' : 'uicon'"
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></u-icon>
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<u-badge :count="item.count" :is-dot="item.isDot"
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v-if="item.count > 0"
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:offset="[-2, getOffsetRight(item.count, item.isDot)]"
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></u-badge>
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</view>
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<view class="u-tabbar__content__item__text" :style="{
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color: elColor(index)
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}">
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<text class="u-line-1">{{item.text}}</text>
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</view>
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</view>
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<view v-if="midButton" class="u-tabbar__content__circle__border" :class="{
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'u-border': borderTop,
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}" :style="{
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backgroundColor: bgColor,
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left: midButtonLeft
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}">
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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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<view class="u-fixed-placeholder safe-area-inset-bottom" :style="{
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height: `calc(${$u.addUnit(height)} + ${midButton ? 48 : 0}rpx)`,
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}"></view>
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</view>
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</template>
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<script>
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export default {
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props: {
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// 显示与否
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show: {
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type: Boolean,
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default: true
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},
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// 通过v-model绑定current值
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value: {
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type: [String, Number],
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default: 0
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},
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// 整个tabbar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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// 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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height: {
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type: [String, Number],
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default: '50px'
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},
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// 非凸起图标的大小，单位任意，数值默认rpx
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iconSize: {
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type: [String, Number],
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default: 40
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},
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// 凸起的图标的大小，单位任意，数值默认rpx
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midButtonSize: {
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type: [String, Number],
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default: 90
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},
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// 激活时的演示，包括字体图标，提示文字等的演示
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activeColor: {
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type: String,
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default: '#303133'
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},
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// 未激活时的颜色
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inactiveColor: {
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type: String,
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default: '#606266'
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},
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// 是否显示中部的凸起按钮
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midButton: {
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type: Boolean,
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default: false
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},
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// 配置参数
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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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// 切换前的回调
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beforeSwitch: {
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type: Function,
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default: null
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},
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// 是否显示顶部的横线
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borderTop: {
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type: Boolean,
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default: true
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},
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// 是否隐藏原生tabbar
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hideTabBar: {
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type: Boolean,
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default: true
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},
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},
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data() {
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return {
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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计算将其其中
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midButtonLeft: '50%',
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pageUrl: '', // 当前
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}
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},
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created() {
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// 是否隐藏原生tabbar
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if(this.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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let 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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this.pageUrl = pages[pages.length - 1].route;
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},
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computed: {
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elIconPath() {
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return (index) => {
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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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let pagePath = this.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 == this.pageUrl || pagePath == '/' + this.pageUrl) {
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return this.list[index].selectedIconPath;
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} else {
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return this.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 == this.value ? this.list[index].selectedIconPath : this.list[index].iconPath
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}
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}
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},
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elColor() {
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return (index) => {
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// 判断方法同理于elIconPath
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let pagePath = this.list[index].pagePath;
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if(pagePath) {
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if(pagePath == this.pageUrl || pagePath == '/' + this.pageUrl) return this.activeColor;
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else return this.inactiveColor;
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} else {
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return index == this.value ? this.activeColor : this.inactiveColor;
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}
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}
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}
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},
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mounted() {
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this.midButton && this.getMidButtonLeft();
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},
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methods: {
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async clickHandler(index) {
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if(this.beforeSwitch && typeof(this.beforeSwitch) === 'function') {
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// 执行回调，同时传入索引当作参数
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// 在微信，支付宝等环境(H5正常)，会导致父组件定义的customBack()函数体中的this变成子组件的this
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// 通过bind()方法，绑定父组件的this，让this.customBack()的this为父组件的上下文
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let beforeSwitch = this.beforeSwitch.bind(this.$u.$parent.call(this))(index);
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// 判断是否返回了promise
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if (!!beforeSwitch && typeof beforeSwitch.then === 'function') {
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await beforeSwitch.then(res => {
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// promise返回成功，
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this.switchTab(index);
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}).catch(err => {
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})
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} else if(beforeSwitch === true) {
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// 如果返回true
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this.switchTab(index);
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}
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} else {
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this.switchTab(index);
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}
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},
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// 切换tab
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switchTab(index) {
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// 发出事件和修改v-model绑定的值
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this.$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(this.list[index].pagePath) {
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uni.switchTab({
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url: this.list[index].pagePath
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})
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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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this.$emit('input', index);
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}
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},
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// 计算角标的right值
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getOffsetRight(count, isDot) {
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// 点类型，count大于9(两位数)，分别设置不同的right值，避免位置太挤
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if(isDot) {
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return -20;
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} else if(count > 9) {
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return -40;
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} else {
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return -30;
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}
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},
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// 获取凸起按钮外层元素的left值，让其水平居中
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getMidButtonLeft() {
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let windowWidth = this.$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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this.midButtonLeft = (windowWidth / 2) + 'px';
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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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.u-fixed-placeholder {
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box-sizing: content-box;
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}
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.u-tabbar {
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&__content {
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display: 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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box-sizing: content-box;
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&__circle__border {
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border-radius: 100%;
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width: 110rpx;
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height: 110rpx;
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top: -48rpx;
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position: absolute;
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z-index: 4;
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background-color: #ffffff;
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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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display: 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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&__button {
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position: absolute;
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top: 10rpx;
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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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position: absolute;
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bottom: 12rpx;
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left: 50%;
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transform: translateX(-50%);
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}
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}
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&__circle {
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position: relative;
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display: 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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height: calc(100% - 1px);
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&__button {
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width: 90rpx;
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height: 90rpx;
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border-radius: 100%;
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display: flex;
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justify-content: center;
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align-items: center;
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position: absolute;
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background-color: #ffffff;
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top: -40rpx;
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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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