438 lines
14 KiB
Vue
438 lines
14 KiB
Vue
<template>
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<view class="tabs">
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<u-sticky :enable="isFixed" :bg-color="stickyBgColor" :offset-top="top" :h5-nav-height="0">
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<view
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:id="id"
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:style="{
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background: bgColor
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}"
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>
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<scroll-view
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:style="{ height: height + 'rpx' }"
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scroll-x
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class="scroll-view"
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:scroll-left="scrollLeft"
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scroll-with-animation
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>
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<view class="scroll-box" :class="{ 'tabs-scorll-flex': !isScroll }">
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<view
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class="tab-item line1"
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:id="'tab-item-' + index"
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v-for="(item, index) in list"
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:key="index"
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@tap="clickTab(index)"
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:style="[tabItemStyle(index)]"
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>
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<u-badge
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:count="item[count] || item['dot'] || 0"
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:offset="offset"
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size="mini"
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></u-badge>
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{{ item[name] || item['name'] }}
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</view>
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<view v-if="showBar" class="tab-bar" :style="[tabBarStyle]"></view>
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</view>
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</scroll-view>
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</view>
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</u-sticky>
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<view
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class="tab-content"
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@touchstart="onTouchStart"
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@touchmove="onTouchMove"
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@touchcancel="onTouchEnd"
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@touchend="onTouchEnd"
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>
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<!-- <view class="tab-track" :class="{'tab-animated': animated}" :style="[trackStyle]"> -->
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<view>
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<slot></slot>
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</view>
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<!-- </view> -->
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</view>
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</view>
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</template>
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<script lang="ts" setup>
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import { getRect } from '@/utils/util'
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import {
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ref,
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reactive,
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computed,
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watch,
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provide,
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nextTick,
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onMounted,
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getCurrentInstance
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} from 'vue'
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import { useTouch } from '@/hooks/useTouch'
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// Touch 钩子
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const { touch, resetTouchStatus, touchStart, touchMove } = useTouch()
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const emit = defineEmits<{
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(event: 'change', value: number): void
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}>()
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const props = withDefaults(
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defineProps<{
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isScroll?: boolean // 导航菜单是否需要滚动，如只有2或者3个的时候，就不需要滚动了，此时使用flex平分tab的宽度
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current?: number | string // 当前活动tab的索引
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height?: number | string // 导航栏的高度和行高
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fontSize?: number | string // 字体大小
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duration?: number | string // 过渡动画时长, 单位ms
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activeColor?: number | string // 选中项的主题颜色
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inactiveColor?: number | string // 未选中项的颜色
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barWidth?: number | string // 菜单底部移动的bar的宽度，单位rpx
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barHeight?: number // 移动bar的高度
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gutter?: number | string // 单个tab的左或有内边距（左右相同）
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bgColor?: number | string // 导航栏的背景颜色
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name?: string // 读取传入的数组对象的属性(tab名称)
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count?: string // 读取传入的数组对象的属性(徽标数)
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offset?: number[] // 徽标数位置偏移
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bold?: boolean // 活动tab字体是否加粗
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activeItemStyle?: any // 当前活动tab item的样式
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showBar?: boolean // 是否显示底部的滑块
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barStyle?: any // 底部滑块的自定义样式
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itemWidth?: string // 标签的宽度
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isFixed?: boolean // 吸顶是否固定
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top?: number | string // 吸顶顶部距离
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stickyBgColor?: string // 吸顶颜色
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swipeable: boolean // 是否允许滑动切换
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// animated: boolean // 切换动画
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}>(),
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{
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isScroll: true,
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current: 0,
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height: 80,
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fontSize: 28,
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duration: 0.3,
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activeColor: '#2073F4',
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inactiveColor: '#333',
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barWidth: 40,
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barHeight: 4,
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gutter: 30,
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bgColor: '#FFFFFF',
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name: 'name',
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count: 'count',
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offset: [5, 20],
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bold: true,
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activeItemStyle: {},
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showBar: true,
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barStyle: {},
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itemWidth: 'auto',
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isFixed: false,
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top: 0,
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stickyBgColor: '#FFFFFF',
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swipeable: true
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// animated: true
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}
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)
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const list = ref<any>([])
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const childrens = ref<any>([])
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const scrollLeft = ref<number>(0) // 滚动scroll-view的左边滚动距离
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const tabQueryInfo = ref<any>([]) // 存放对tab菜单查询后的节点信息
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const componentWidth = ref<number>(0) // 屏幕宽度，单位为px
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const scrollBarLeft = ref<number>(0) // 移动bar需要通过translateX()移动的距离
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const parentLeft = ref<number>(0) // 父元素(tabs组件)到屏幕左边的距离
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const id = ref<string>('cu-tab') // id值
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const currentIndex = ref<any>(props.current)
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const barFirstTimeMove = ref<boolean>(true) // 滑块第一次移动时(页面刚生成时)，无需动画，否则给人怪异的感觉
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const swiping = ref<boolean>(false)
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//@ts-ignore
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const ctx = getCurrentInstance()
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// 监听tab的变化，重新计算tab菜单的布局信息，因为实际使用中菜单可能是通过
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// 后台获取的（如新闻app顶部的菜单），获取返回需要一定时间，所以list变化时，重新获取布局信息
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watch(
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() => list.value,
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async (n, o) => {
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// list变动时，重制内部索引，否则可能导致超出数组边界的情况
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if (!barFirstTimeMove.value && n.length !== o.length) {
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currentIndex.value = 0
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}
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// 用$nextTick等待视图更新完毕后再计算tab的局部信息，否则可能因为tab还没生成就获取，就会有问题
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await nextTick()
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init()
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}
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)
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watch(
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() => props.current,
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(nVal, oVal) => {
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// 视图更新后再执行移动操作、
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nextTick(() => {
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currentIndex.value = nVal
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scrollByIndex()
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})
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},
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{ immediate: true }
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)
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// 移动bar的样式
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const tabBarStyle = computed(() => {
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const style = {
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width: props.barWidth + 'rpx',
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transform: `translate(${scrollBarLeft.value}px, -100%)`,
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// 滑块在页面渲染后第一次滑动时，无需动画效果
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'transition-duration': `${barFirstTimeMove.value ? 0 : props.duration}s`,
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'background-color': props.activeColor,
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height: props.barHeight + 'rpx',
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opacity: barFirstTimeMove.value ? 0 : 1,
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// 设置一个很大的值，它会自动取能用的最大值，不用高度的一半，是因为高度可能是单数，会有小数出现
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'border-radius': `${props.barHeight / 2}px`
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}
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Object.assign(style, props.barStyle)
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return style
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})
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// tab的样式
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const tabItemStyle = computed(() => {
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return (index) => {
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let style: any = {
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height: props.height + 'rpx',
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'line-height': props.height + 'rpx',
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'font-size': props.fontSize + 'rpx',
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padding: props.isScroll ? `0 ${props.gutter}rpx` : '',
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flex: props.isScroll ? 'auto' : '1',
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width: `${props.itemWidth}rpx`
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}
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// 字体加粗
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if (index == currentIndex.value && props.bold) style.fontWeight = 'bold'
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if (index == currentIndex.value) {
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style.color = props.activeColor
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// 给选中的tab item添加外部自定义的样式
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style = Object.assign(style, props.activeItemStyle)
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} else {
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style.color = props.inactiveColor
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}
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return style
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}
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})
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// const trackStyle = computed(() => {
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// if (!props.animated) return ''
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// return {
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// left: -100 * currentIndex.value + '%',
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// 'transition-duration': props.duration + 's',
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// '-webkit-transition-duration': props.duration + 's',
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// }
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// })
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const updateTabs = () => {
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list.value = childrens.value.map((item) => {
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const { name, dot, active, inited } = item.event
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const { updateRender } = item
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return {
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name,
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dot,
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active,
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inited,
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updateRender
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}
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})
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// nextTick(() => {
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// init()
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// })
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}
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// 设置一个init方法，方便多处调用
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const init = async () => {
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// 获取tabs组件的尺寸信息
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const tabRect = await getRect('#' + id.value, false, ctx)
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// tabs组件距离屏幕左边的宽度
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parentLeft.value = tabRect.left
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// tabs组件的宽度
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componentWidth.value = tabRect.width
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getTabRect()
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}
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// 点击某一个tab菜单
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const clickTab = (index) => {
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// 点击当前活动tab，不触发事件
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if (index == currentIndex.value) return
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nextTick(() => {
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currentIndex.value = index
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scrollByIndex()
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})
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// 发送事件给父组件
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emit('change', index)
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}
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// 查询tab的布局信息
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const getTabRect = () => {
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// 创建节点查询
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const query: any = uni.createSelectorQuery().in(ctx)
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// 历遍所有tab，这里是执行了查询，最终使用exec()会一次性返回查询的数组结果
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for (let i = 0; i < list.value.length; i++) {
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// 只要size和rect两个参数
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query.select(`#tab-item-${i}`).fields({
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size: true,
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rect: true
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})
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}
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// 执行查询，一次性获取多个结果
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query.exec((res) => {
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tabQueryInfo.value = res
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// 初始化滚动条和移动bar的位置
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scrollByIndex()
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})
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}
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// 滚动scroll-view，让活动的tab处于屏幕的中间位置
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const scrollByIndex = () => {
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// 当前活动tab的布局信息，有tab菜单的width和left(为元素左边界到父元素左边界的距离)等信息
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const tabInfo = tabQueryInfo.value[currentIndex.value]
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if (!tabInfo) return
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// 活动tab的宽度
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const tabWidth = tabInfo.width
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// 活动item的左边到tabs组件左边的距离，用item的left减去tabs的left
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const offsetLeft = tabInfo.left - parentLeft.value
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// 将活动的tabs-item移动到屏幕正中间，实际上是对scroll-view的移动
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const scrollLefts = offsetLeft - (componentWidth.value - tabWidth) / 2
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scrollLeft.value = scrollLefts < 0 ? 0 : scrollLefts
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// 当前活动item的中点点到左边的距离减去滑块宽度的一半，即可得到滑块所需的移动距离
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const left = tabInfo.left + tabInfo.width / 2 - parentLeft.value
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// 计算当前活跃item到组件左边的距离
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scrollBarLeft.value = left - uni.upx2px(props.barWidth) / 2
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// 第一次移动滑块的时候，barFirstTimeMove为true，放到延时中将其设置false
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// 延时是因为scrollBarLeft作用于computed计算时，需要一个过程需，否则导致出错
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if (barFirstTimeMove.value == true) {
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setTimeout(() => {
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barFirstTimeMove.value = false
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}, 100)
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}
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// 更新子组件的显示
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childrens.value.forEach((item, ind) => {
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const active = ind === currentIndex.value
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if (active !== item.event.active || !item.event.inited) {
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item.updateRender(active)
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}
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})
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}
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// 子组件调用此函数而产生的事件通信
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const handleChange = (event, updateRender) => {
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childrens.value.push({ event: event, updateRender })
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}
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// 手指触摸
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const onTouchStart = (event) => {
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if (!props.swipeable) return
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swiping.value = true
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touchStart(event)
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}
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// 手指滑动
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const onTouchMove = (event) => {
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if (!props.swipeable || !swiping.value) return
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touchMove(event)
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}
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// 手指滑动结束
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const onTouchEnd = () => {
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if (!props.swipeable || !swiping.value) return
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const minSwipeDistance = 50
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if (touch.direction === 'horizontal' && touch.offsetX >= minSwipeDistance) {
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let index,
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len = list.value.length,
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curIndex = currentIndex.value
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if (touch.deltaX <= 0) {
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curIndex >= len - 1 ? (index = 0) : (index = curIndex + 1)
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} else {
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curIndex <= 0 ? (index = len - 1) : (index = curIndex - 1)
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}
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nextTick(() => {
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currentIndex.value = index
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scrollByIndex()
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})
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// 发送事件给父组件
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emit('change', index)
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}
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swiping.value = false
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}
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onMounted(() => {
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updateTabs()
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})
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provide('handleChange', handleChange)
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provide('updateTabs', updateTabs)
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</script>
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<style lang="scss" scoped>
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/* #ifndef APP-NVUE */
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::-webkit-scrollbar,
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::-webkit-scrollbar,
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::-webkit-scrollbar {
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display: none;
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width: 0 !important;
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height: 0 !important;
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-webkit-appearance: none;
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background: transparent;
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}
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/* #endif */
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.scroll-box {
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height: 100%;
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position: relative;
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/* #ifdef MP-TOUTIAO */
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white-space: nowrap;
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/* #endif */
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}
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.tab-fixed {
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position: sticky;
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top: 0;
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width: 100%;
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}
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/* #ifdef H5 */
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// 通过样式穿透，隐藏H5下，scroll-view下的滚动条
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scroll-view ::v-deep ::-webkit-scrollbar {
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display: none;
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width: 0 !important;
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height: 0 !important;
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-webkit-appearance: none;
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background: transparent;
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}
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/* #endif */
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.scroll-view {
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width: 100%;
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white-space: nowrap;
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position: relative;
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}
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.tab-item {
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position: relative;
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/* #ifndef APP-NVUE */
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display: inline-block;
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/* #endif */
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text-align: center;
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transition-property: background-color, color;
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}
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.tab-bar {
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position: absolute;
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bottom: 6rpx;
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}
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.tabs-scorll-flex {
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display: flex;
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justify-content: space-between;
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}
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// .tab-content {
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// overflow: hidden;
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// .tab-track {
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// position: relative;
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// width: 100%;
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// height: 100%;
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// }
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// .tab-animated {
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// display: flex;
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// transition-property: left;
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// }
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// }
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</style>
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