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