318 lines
11 KiB
Vue
318 lines
11 KiB
Vue
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<template>
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<view class="u-tabs" :style="$u.toStyle({ background: bgColor }, customStyle)" :class="customClass">
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<!-- $u.getRect()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>
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<scroll-view
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scroll-x
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class="u-scroll-view"
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:scroll-left="scrollLeft"
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:show-scrollbar="false"
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scroll-with-animation
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>
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<view class="u-scroll-box" :id="id" :class="{ 'u-tabs-scroll-flex': !isScroll }">
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<view
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class="u-tab-item u-line-1"
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:class="[item.hidden ? 'u-tab-item-hidden' : '']"
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:id="'u-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 :count="item[count] || item['count'] || 0" :offset="offset" size="mini"></u-badge>
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{{ item[name] || item['name'] }}
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</view>
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<view v-if="showBar" class="u-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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</view>
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</template>
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<script lang="ts">
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export default {
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name: 'u-tabs',
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options: {
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addGlobalClass: true,
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// #ifndef MP-TOUTIAO
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virtualHost: true,
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// #endif
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styleIsolation: 'shared'
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}
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};
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</script>
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<script setup lang="ts">
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import { ref, computed, watch, onMounted, nextTick, getCurrentInstance } from 'vue';
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import { $u } from '../..';
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import { TabsProps } from './types';
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/**
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* tabs 标签
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* @description 该组件,是一个tabs标签组件,在标签多的时候,可以配置为左右滑动,标签少的时候,可以禁止滑动。 该组件的一个特点是配置为滚动模式时,激活的tab会自动移动到组件的中间位置。
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* @tutorial https://uviewpro.cn/zh/components/tabs.html
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* @property {Boolean} is-scroll tabs是否可以左右拖动(默认true)
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* @property {Array} list 标签数组,元素为对象,如[{name: '推荐'}]
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* @property {String|Number} current 指定哪个tab为激活状态(默认0)
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* @property {String|Number} height 导航栏的高度,单位rpx(默认80)
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* @property {String|Number} font-size tab文字大小,单位rpx(默认30)
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* @property {String|Number} duration 滑块移动一次所需的时间,单位秒(默认0.5)
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* @property {String} active-color 滑块和激活tab文字的颜色(默认主题色primary)
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* @property {String} inactive-color tabs文字颜色(默认var(--u-main-color))
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* @property {String|Number} bar-width 滑块宽度,单位rpx(默认40)
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* @property {Object} active-item-style 活动tabs item的样式,对象形式
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* @property {Object} bar-style 底部滑块的样式,对象形式
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* @property {Boolean} show-bar 是否显示底部的滑块(默认true)
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* @property {String|Number} bar-height 滑块高度,单位rpx(默认6)
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* @property {String|Number} item-width 标签的宽度(默认auto)
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* @property {String|Number} gutter 单个tab标签的左右内边距之和,单位rpx(默认40)
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* @property {String} bg-color tabs导航栏的背景颜色(默认var(--u-bg-white))
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* @property {String} name 组件内部读取的list参数中的属性名(tab名称),见官网说明(默认name)
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* @property {String} count 组件内部读取的list参数中的属性名(badge徽标数),同name属性的使用,见官网说明(默认count)
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* @property {Array} offset 设置badge徽标数的位置偏移,格式为 [x, y],也即设置的为top和right的值,单位rpx(默认[5, 20])
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* @property {Boolean} bold 激活选项的字体是否加粗(默认true)
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* @event {Function} change 点击标签时触发
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* @example <u-tabs ref="tabs" :list="list" :is-scroll="false"></u-tabs>
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*/
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// props 定义
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const props = defineProps(TabsProps);
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/**
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* emits 定义
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*/
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const emit = defineEmits(['change']);
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const instance = getCurrentInstance();
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// 滚动scroll-view的左边滚动距离
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const scrollLeft = ref(0);
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// 存放对tab菜单查询后的节点信息
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const tabQueryInfo = ref<any[]>([]);
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// 屏幕宽度,单位为px
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const componentWidth = ref(0);
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// 移动bar需要通过translateX()移动的距离
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const scrollBarLeft = ref(0);
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// 父元素(tabs组件)到屏幕左边的距离
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const parentLeft = ref(0);
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// id值
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const id = ref($u.guid());
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// 当前活动tab索引
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const currentIndex = ref(props.current);
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// 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 barFirstTimeMove = ref(true);
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// 监听list变化,重置索引并重新布局
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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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() => props.list,
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(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) currentIndex.value = 0;
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// 用$nextTick等待视图更新完毕后再计算tab的局部信息,否则可能因为tab还没生成就获取,就会有问题
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nextTick(() => {
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init();
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});
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}
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);
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// 监听current变化,自动滚动
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watch(
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() => props.current,
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nVal => {
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// 视图更新后再执行移动操作
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nextTick(() => {
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currentIndex.value = nVal;
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scrollByIndex();
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});
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},
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{ immediate: true }
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);
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// 移动bar的样式
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const tabBarStyle = computed(() => {
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const style: Record<string, any> = {
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width: props.barWidth + 'rpx',
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transform: `translate(${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': `${barFirstTimeMove.value ? 0 : props.duration}s`,
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'background-color': props.activeColor,
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height: props.barHeight + 'rpx',
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opacity: barFirstTimeMove.value ? 0 : 1,
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// 设置一个很大的值,它会自动取能用的最大值,不用高度的一半,是因为高度可能是单数,会有小数出现
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'border-radius': `${Number(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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function tabItemStyle(index: number) {
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let style: Record<string, 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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'transition-duration': `${props.duration}s`,
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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: $u.addUnit(props.itemWidth)
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};
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// 字体加粗
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if (index == Number(currentIndex.value) && props.bold) style.fontWeight = 'bold';
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if (index == Number(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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* 初始化tab布局信息
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*/
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async function init() {
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// 获取tabs组件的尺寸信息
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const tabRect = await $u.getRect('#' + id.value, instance);
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// tabs组件距离屏幕左边的宽度
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parentLeft.value = tabRect.left;
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// tabs组件的宽度
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componentWidth.value = tabRect.width;
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getTabRect();
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}
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/**
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* 点击某一个tab菜单
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*/
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function clickTab(index: number) {
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// 点击当前活动tab,不触发事件
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if (index == currentIndex.value) return;
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// 发送事件给父组件
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emit('change', index);
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}
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/**
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* 查询tab的布局信息
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*/
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function getTabRect() {
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// 创建节点查询
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const query = uni.createSelectorQuery().in(instance?.proxy);
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// 历遍所有tab,这里是执行了查询,最终使用exec()会一次性返回查询的数组结果
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for (let i = 0; i < props.list.length; i++) {
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// 只要size和rect两个参数
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query.select(`#u-tab-item-${i}`).fields({ size: true, rect: true }, () => {});
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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: any[]) => {
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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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/**
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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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*/
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function 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[Number(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 scrollL = offsetLeft - (componentWidth.value - tabWidth) / 2;
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scrollLeft.value = scrollL < 0 ? 0 : scrollL;
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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(Number(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) {
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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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}
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onMounted(() => {
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init();
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});
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defineExpose({ init, clickTab, scrollByIndex });
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</script>
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<style lang="scss" scoped>
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@import '../../libs/css/style.components.scss';
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view,
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scroll-view {
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box-sizing: border-box;
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}
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// 隐藏滚动条样式,支持App、H5、小程序等平台
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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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.u-scroll-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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/* #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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// App-nvue 平台使用特殊的滚动条隐藏方式
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/* #ifdef APP-NVUE */
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.scroll-view-nvue {
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-webkit-scrollbar: none;
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}
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/* #endif */
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.u-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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.u-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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.u-tab-item-hidden {
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display: none;
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}
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.u-tab-bar {
|
|||
|
|
position: absolute;
|
|||
|
|
bottom: 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.u-tabs-scroll-flex {
|
|||
|
|
@include vue-flex;
|
|||
|
|
justify-content: space-between;
|
|||
|
|
}
|
|||
|
|
</style>
|