331 lines
		
	
	
		
			9.0 KiB
		
	
	
	
		
			Vue
		
	
	
	
			
		
		
	
	
			331 lines
		
	
	
		
			9.0 KiB
		
	
	
	
		
			Vue
		
	
	
	
<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 || item.isDot"
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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计算将其居中
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				midButtonLeft: '50%',
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				pageUrl: '', // 当前页面URL
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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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	@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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	}
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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: 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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				@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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				&__button {
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					position: absolute;
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					top: 14rpx;
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					left: 50%;
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					transform: translateX(-50%);
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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: 14rpx;
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					left: 50%;
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					transform: translateX(-50%);
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					width: 100%;
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					text-align: center;
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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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				&__button {
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					width: 90rpx;
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					height: 90rpx;
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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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					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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