145 lines
2.8 KiB
Vue
145 lines
2.8 KiB
Vue
<template>
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<scroll-view class="ss-scroll-navbar" scroll-x :scroll-left="scrollLeft" scroll-with-animation="true">
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<view v-for="(item, index) in navArr" :key="item.category_id" class="nav-item" :style="'color:'+color+';'"
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:class="{current: index === tabCurrentIndex}" @click="tabChange(index)" :id="'item-' + index">
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<view class="after" :style="'border-color:'+color +' ;'"></view>
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<text class="title">{{item.name}}</text>
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</view>
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</scroll-view>
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</template>
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<script>
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export default {
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name: 'ss-scroll-navbar',
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props: {
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navArr: {
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type: Array,
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default () {
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return [{
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name: '推荐',
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category_id: 'recent'
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}]
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}
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},
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tabCurrentIndex: {
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type: Number,
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default: 0
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},
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scrollChangeIndex: {
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type: Number,
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default: 0
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},
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color: {
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type: String,
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default: '#ffffff'
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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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widthList: [],
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screenWidth: 0,
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}
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},
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methods: {
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/**
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* 导航栏navbar
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* 点击事件
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*/
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tabChange(index) {
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this.$emit('navbarTap', index);
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var widthArr = this.widthList;
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var scrollWidth = 0;
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for (var i = 0; i < index + 1; i++) {
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scrollWidth += widthArr[i];
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}
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let currentWidth = widthArr[index];
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// scrollView 居中算法
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// 减去固定宽度位移
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// 减去选中的bar的宽度的一半
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scrollWidth -= this.screenWidth / 2;
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scrollWidth -= currentWidth / 2;
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this.scrollLeft = scrollWidth;
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},
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calculateItemWidth() {
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var that = this;
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var arr = [];
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let w = 0;
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this.navArr.forEach((item, index) => {
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let view = uni.createSelectorQuery().in(this).select("#item-" + index);
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view.fields({
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size: true
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}, data => {
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arr.push(data.width);
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}).exec();
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})
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this.widthList = arr;
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},
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calculateWindowWidth() {
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var info = uni.getSystemInfoSync();
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this.screenWidth = info.screenWidth;
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}
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},
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created() {
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var that = this;
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this.calculateWindowWidth();
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setTimeout(function() {
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that.calculateItemWidth();
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}, 1000);
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},
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watch: {
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scrollChangeIndex(val) {
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this.tabChange(val)
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},
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},
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}
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</script>
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<style lang="scss">
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.ss-scroll-navbar {
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width: 100%;
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height: 80rpx;
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box-shadow: 0 2upx 8upx rgba(0, 0, 0, .06);
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white-space: nowrap;
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text-align: start;
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.nav-item {
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height: 80rpx;
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text-align: center;
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padding: 0upx 20upx;
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color: #FFFFFF;
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display: inline-block;
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position: relative;
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font-size: 32upx;
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.title {
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line-height: 80rpx;
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}
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.after {
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content: '';
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width: 0;
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height: 0;
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border-bottom: 4upx solid #ffffff;
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position: absolute;
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left: 50%;
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bottom: 0;
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transform: translateX(-50%);
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transition: .3s;
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}
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}
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.current {
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color: #ffffff;
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font-weight: bold;
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.after {
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width: 50%;
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}
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}
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}
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</style>
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