280 lines
7.8 KiB
Vue
280 lines
7.8 KiB
Vue
<template>
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<view class="tab" :style="{ background }">
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<scroll-view class="scroll-view-content" scroll-x scroll-with-animation :show-scrollbar="false"
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:scroll-left="scrollLeft">
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<view class="scroll-item-view" :class="scroll ? '' : 'flex-row-left'" id="tab">
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<view class="scroll-item" :class="[index == list.length - 1 ? 'no-right' : '']"
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:style="{ color: currentIndex == index ? activeColor : '', height: tabHeight, 'line-height': tabHeight, 'font-size': fontSize, width: !scroll ? (100 / list.length) + '%' : '', 'margin-right': scroll ? marright : '', 'font-weight': currentIndex == index ? activeWeight : '' }"
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:id="'tab-item-' + index" v-for="(item, index) in list" :key="index" @click="clickTab(item, index)">
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{{ item[titalName] }}
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</view>
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<view class="scroll-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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</template>
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<script>
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export default {
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props: {
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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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// 当前活动tab的索引
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current: {
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type: [Number, String],
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default: 0
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},
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titalName: {
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type: String,
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default: 'name'
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},
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// 菜单底部移动的bar的宽度，单位px
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barWidth: {
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type: [String, Number],
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default: 16
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},
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// 移动bar的高度
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barHeight: {
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type: [String, Number],
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default: 2
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},
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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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// 移动bar选中颜色
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activeBarColor: {
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type: String,
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default: '#4990F9'
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},
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// 文字选中颜色
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activeColor: {
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type: String,
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default: '#4990F9'
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},
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// 过渡动画时长, 单位ms
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duration: {
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type: [String, Number],
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default: 0.5
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},
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// tab高度
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height: {
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type: Number,
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default: 34
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},
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// 字体
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fontSize: {
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type: String,
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default: '16px'
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},
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// 是否滚动，默认是，否则是不滚动，按个数等分宽度
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scroll: {
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type: Boolean,
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default: true
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},
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// margin-right
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marright: {
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type: String,
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default: '38px'
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},
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// font-weight
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activeWeight: {
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type: String,
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default: 'normal'
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},
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background: {
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type: String,
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default: ''
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}
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},
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watch: {
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list(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 (n.length !== o.length) this.currentIndex = 0;
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this.$nextTick(() => {
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this.init();
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});
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},
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current: {
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immediate: true,
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handler(nVal, oVal) {
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// 视图更新后再执行移动操作
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this.$nextTick(() => {
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this.currentIndex = nVal;
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this.scrollByIndex();
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});
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}
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}
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},
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computed: {
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tabBarStyle: function () {
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let style = {
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width: this.barWidth + 'px',
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height: this.barHeight + 'px',
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transform: `translateX(${this.scrollBarLeft}px)`,
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'transition-duration': `${this.barFirstTimeMove ? 0 : this.duration}s`,
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'border-radius': `${this.barHeight / 2}px`,
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'background-color': this.activeBarColor
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}
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Object.assign(style, this.barStyle)
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return style
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},
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tabHeight() {
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return this.height + 'px'
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}
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},
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data() {
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return {
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scrollLeft: 0,
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componentWidth: 0, // tabs组件宽度，单位为px
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parentLeft: 0, // 父元素(tabs组件)到屏幕左边的距离
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scrollBarLeft: 0, // 移动bar需要通过translateX()移动的距离
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tabItemRectInfo: [],
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currentIndex: 0,
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barFirstTimeMove: true
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};
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},
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mounted() {
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this.init()
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},
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methods: {
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init() {
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this.$nextTick(() => {
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uni.createSelectorQuery().in(this).select(`#tab`).fields({
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size: true,
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rect: true
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}, data => {
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this.parentLeft = data.left;
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// tabs组件的宽度
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this.componentWidth = data.width;
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}).exec();
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this.getTabItemRect()
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})
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},
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getTabItemRect() {
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let query = uni.createSelectorQuery().in(this);
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for (let i = 0; i < this.list.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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query.exec((data) => {
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this.tabItemRectInfo = data
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this.scrollByIndex()
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})
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},
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scrollByIndex() {
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let tabInfo = this.tabItemRectInfo[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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let offsetLeft = tabInfo.left - this.parentLeft
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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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let scrollLeft = offsetLeft - (this.componentWidth - tabWidth) / 2
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this.scrollLeft = scrollLeft < 0 ? 0 : scrollLeft;
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// 计算当前活跃item到组件左边的距离
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let left = tabInfo.left + tabInfo.width / 2 - this.parentLeft
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this.scrollBarLeft = left - this.barWidth / 2;
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if (this.barFirstTimeMove == true) {
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setTimeout(() => {
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this.barFirstTimeMove = false;
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}, 100)
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}
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},
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clickTab(item, index) {
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// 点击当前活动tab，不触发事件
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if (index == this.currentIndex) return
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this.currentIndex = index
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this.$emit('tabItemClick', item, index)
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this.scrollByIndex()
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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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.tab {
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position: sticky;
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top: 88rpx;
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left: 0;
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width: 100%;
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z-index: 9;
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height: 88rpx;
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}
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scroll-view {
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box-sizing: border-box;
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height: 100%;
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}
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::v-deep ::-webkit-scrollbar {
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display: none
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}
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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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/* #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-content {
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white-space: nowrap;
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width: 100%;
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position: relative;
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.scroll-item-view {
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width: 100%;
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white-space: nowrap;
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position: relative;
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margin-bottom: 20rpx;
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}
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.scroll-item {
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position: relative;
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padding: 0 20rpx;
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display: inline-block;
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text-align: center;
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color: #8C8C8C;
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}
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.mar-r-38 {
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margin-right: 76rpx;
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}
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.no-right {
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margin: 0;
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}
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.scroll-tab-bar {
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position: absolute;
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bottom: 0;
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z-index: 10;
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}
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}
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</style> |