<template>
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<view class="tn-tabs-class tn-tabs" :class="[backgroundColorClass]" :style="{backgroundColor: backgroundColorStyle, marginTop: $t.string.getLengthUnitValue(top, 'px')}">
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<!-- _tgetRect()对组件根节点无效，因为写了.in(this)，故这里获取内层接点尺寸 -->
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<view :id="id">
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<scroll-view scroll-x class="tn-tabs__scroll-view" :scroll-left="scrollLeft" scroll-with-animation>
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<view class="tn-tabs__scroll-view__box" :class="{'tn-tabs__scroll-view--flex': !isScroll}">
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<!-- item -->
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<view
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v-for="(item, index) in list"
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:key="index"
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:id="'tn-tabs__scroll-view__item-' + index"
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class="tn-tabs__scroll-view__item tn-text-ellipsis"
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:style="[tabItemStyle(index)]"
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@tap="clickTab(index)"
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>
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<tn-badge v-if="item[count] || item['count']" backgroundColor="tn-bg-red" fontColor="#FFFFFF" :absolute="true" :top="badgeOffset[0] || 0" :right="badgeOffset[1] || 0">{{ item[count] || item['count']}}</tn-badge>
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{{ item[name] || item['name'] }}
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</view>
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<!-- 底部滑块 -->
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<view v-if="showBar" class="tn-tabs__bar" :style="[tabBarStyle]"></view>
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</view>
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</scroll-view>
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</view>
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</view>
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</template>
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<script>
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import componentsColor from '../../libs/mixin/components_color.js'
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export default {
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mixins: [componentsColor],
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name: 'tn-tabs',
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props: {
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// 标签列表
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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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// 列表数据tab名称的属性
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name: {
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type: String,
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default: 'name'
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},
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// 列表数据微标数量的属性
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count: {
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type: String,
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default: 'count'
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},
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// 当前活动的tab索引
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current: {
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type: Number,
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default: 0
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},
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// 菜单是否可以滑动
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isScroll: {
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type: Boolean,
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default: true
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},
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// 高度
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height: {
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type: Number,
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default: 80
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},
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// 距离顶部的距离(px)
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top: {
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type: Number,
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default: 0
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},
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// item的宽度
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itemWidth: {
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type: [String, Number],
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default: 'auto'
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},
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// 过渡动画时长
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duration: {
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type: Number,
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default: 0.3
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},
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// 选中时的颜色
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activeColor: {
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type: String,
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default: '#01BEFF'
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},
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// 未被选中时的颜色
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inactiveColor: {
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type: String,
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default: '#080808'
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},
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// 选中的item样式
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activeItemStyle: {
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type: Object,
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default() {
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return {}
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}
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},
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// 是否显示底部滑块
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showBar: {
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type: Boolean,
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default: true
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},
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// 底部滑块的宽度
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barWidth: {
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type: Number,
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default: 40
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},
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// 底部滑块的高度
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barHeight: {
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type: Number,
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default: 6
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},
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// 自定义底部滑块的样式
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barStyle: {
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type: Object,
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default() {
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return {}
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}
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},
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// 单个tab的左右内边距
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gutter: {
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type: Number,
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default: 30
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},
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// 微标的偏移数[top, right]
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badgeOffset: {
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type: Array,
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default() {
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return [20, 22]
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}
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},
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// 是否加粗字体
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bold: {
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type: Boolean,
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default: false
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}
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},
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computed: {
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// 底部滑块样式
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tabBarStyle() {
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let style = {
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width: this.$t.string.getLengthUnitValue(this.barWidth),
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height: this.$t.string.getLengthUnitValue(this.barHeight),
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borderRadius: `${this.barHeight / 2}rpx`,
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backgroundColor: this.activeColor,
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opacity: this.barMoveFirst ? 0 : 1,
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transform: `translate(${this.scrollBarLeft}px, -100%)`,
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transitionDuration: this.barMoveFirst ? '0s' : `${this.duration}s`
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}
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Object.assign(style, this.barStyle)
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return style
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},
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// tabItem样式
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tabItemStyle() {
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return index => {
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let style = {
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width: this.$t.string.getLengthUnitValue(this.itemWidth),
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height: this.$t.string.getLengthUnitValue(this.height),
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lineHeight: this.$t.string.getLengthUnitValue(this.height),
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fontSize: this.fontSizeStyle || '28rpx',
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padding: this.isScroll ? `0 ${this.gutter}rpx` : '',
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flex: this.isScroll ? 'auto' : '1',
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transitionDuration: `${this.duration}s`
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}
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if (index === this.currentIndex) {
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if (this.bold) {
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style.fontWeight = 'bold'
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}
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style.color = this.activeColor
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Object.assign(style, this.activeItemStyle)
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} else {
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style.color = this.inactiveColor
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}
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return style
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}
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}
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},
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data() {
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return {
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// id值
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id: this.$t.uuid(),
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// 滚动scroll-view的左边距离
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scrollLeft: 0,
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// 存放查询后tab菜单的节点信息
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tabQueryInfo: [],
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// 组件宽度
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componentWidth: 0,
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// 底部滑块的移动距离
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scrollBarLeft: 0,
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// 组件到屏幕左边的巨鹿
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componentLeft: 0,
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// 当前选中的itemIndex
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currentIndex: this.current,
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// 标记底部滑块是否第一次移动，第一次移动的时候不触发动画
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barMoveFirst: true
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}
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},
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watch: {
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// 监听tab的变化，重新计算tab菜单信息
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list(newValue, oldValue) {
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// list变化时，重置内部索引，防止出现超过数据边界的问题
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if (newValue.length !== oldValue.length) this.currentIndex = 0
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this.$nextTick(() => {
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this.init()
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})
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},
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current: {
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handler(val) {
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this.$nextTick(() => {
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this.currentIndex = val
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this.scrollByIndex()
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})
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},
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immediate: true
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}
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},
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mounted() {
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this.init()
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},
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methods: {
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// 初始化变量
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async init() {
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// 获取tabs组件的信息
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let tabRect = await this._tGetRect('#' + this.id)
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// 计算组件的宽度
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this.componentLeft = tabRect.left
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this.componentWidth = tabRect.width
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this.getTabRect()
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},
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// 点击tab菜单
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clickTab(index) {
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if (index === this.currentIndex) return
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this.$emit('change', index)
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},
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// 查询tab的布局信息
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getTabRect() {
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let query = uni.createSelectorQuery().in(this)
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// 遍历所有的tab
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for (let i = 0; i < this.list.length; i++) {
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query.select(`#tn-tabs__scroll-view__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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query.exec((res) => {
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this.tabQueryInfo = res
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// 初始滚动条和底部滑块的位置
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this.scrollByIndex()
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})
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},
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// 滚动scrollView，让活动的tab处于屏幕中间
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scrollByIndex() {
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// 当前获取tab的布局信息
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let tabInfo = this.tabQueryInfo[this.currentIndex]
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if (!tabInfo) return
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// 活动tab的宽度
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let tabWidth = tabInfo.width
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// 活动item的左边到组件左边的距离
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let offsetLeft = tabInfo.left - this.componentLeft
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// 计算scroll-view移动的距离
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let scrollLeft = offsetLeft - (this.componentWidth - tabWidth) / 2
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this.scrollLeft = scrollLeft < 0 ? 0 : scrollLeft
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// 计算当前滑块需要移动的距离，当前活动item的中点到左边的距离减去滑块宽度的一半
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let left = tabInfo.left + tabInfo.width / 2 - this.componentLeft
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// 计算当前活跃item到组件左边的距离
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this.scrollBarLeft = left - uni.upx2px(this.barWidth) / 2
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// 防止在计算时出错，所以延迟执行标记不是第一次移动
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if (this.barMoveFirst) {
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setTimeout(() => {
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this.barMoveFirst = false
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}, 100)
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}
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}
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}
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}
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</script>
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<style lang="scss" scoped>
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/* #ifndef APP-NVUE */
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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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/* #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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.tn-tabs {
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&__scroll-view {
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position: relative;
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width: 100%;
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white-space: nowrap;
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&__box {
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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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&__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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&--flex {
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display: flex;
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flex-direction: row;
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justify-content: space-between;
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}
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}
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&__bar {
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position: absolute;
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bottom: 0;
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}
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}
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</style>
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