<template>
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<view class="fy_dropdown" @click.stop.prevent="() => {}">
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<view :class="['fy_dropdown__menu', borderBottom ? 'fy_border-bottom' : '']" id="fy_dropdown__menu" :style="{ 'height': `${height}rpx`, 'background-color': backgroundColor }">
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<view class="fy_dropdown__menu_mian">
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<view class="fy_dropdown__menu__left" :style="{ height: `${height}rpx` }">
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<slot name="left"></slot>
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</view>
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<view class="fy_dropdown__menu__center">
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<view class="fy_dropdown__menu__item" :style="{ height: `${height}rpx` }" v-for="(item, index) in menuList" :key="index" @click="handlerMenuClick(index, item.dropdownKey)">
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<view class="fy_flex">
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<text class="fy_dropdown__menu__item__text" v-if="item.title"
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:style="{ color: item.disabled ? '#c0c4cc' : (index === current || highlightIndex == index) ? activeColor : inactiveColor, fontSize: `${titleSize}rpx` }">{{item.title}}</text>
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<view class="fy_dropdown__menu__item__arrow" :style="{'transform': index === current ? 'scale(0.8) rotate(180deg)' : 'scale(1) rotate(0deg)'}">
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<u-icon :name="menuIcon" :color="index === current || highlightIndex == index ? activeColor : '#c0c4cc'" :size="menuIconSize"></u-icon>
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</view>
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</view>
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</view>
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</view>
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<view class="fy_dropdown__menu__right" :style="{ height: `${height}rpx` }">
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<slot name="right"></slot>
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</view>
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</view>
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</view>
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<u-transition :mode="['fade']" :show="active" :duration="duration" :customStyle="maskClass" @click="handlerMaskClick"></u-transition>
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<u-transition :mode="['fade']" :show="active" :duration="duration" :customStyle="transClass">
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<view class="fy_dropdown__content__popup">
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<slot></slot>
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</view>
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</u-transition>
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</view>
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</template>
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<script>
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/**
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* dropdown 下拉菜单
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* @description 该组件一般用于向下展开菜单,同时可切换多个选项卡的场景
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* @property {String} active-color 标题和选项卡选中的颜色(默认#00bcd4)
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* @property {String} inactive-color 标题和选项卡未选中的颜色(默认#606266)
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* @property {Boolean} close-on-click-mask 点击遮罩是否关闭菜单(默认true)
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* @property {Boolean} close-on-click-self 点击当前激活项标题是否关闭菜单(默认true)
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* @property {String | Number} duration 选项卡展开和收起的过渡时间,单位ms(默认300)
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* @property {String | Number} height 标题菜单的高度,单位任意(默认90)
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* @property {String | Number} border-radius 菜单展开内容下方的圆角值,单位任意(默认0)
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* @property {Boolean} border-bottom 标题菜单是否显示下边框(默认false)
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* @property {String | Number} title-size 标题的字体大小,单位任意,数值默认为rpx单位(默认28)
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* @event {Function} open 下拉菜单被打开时触发
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* @event {Function} close 下拉菜单被关闭时触发
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* @example <fy-dropdown></fy-dropdown>
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*/
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export default {
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name: 'fy-dropdown',
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props: {
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// 菜单标题和选项的激活态颜色
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activeColor: {
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type: String, default: '#00bcd4'
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},
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// 菜单标题和选项的未激活态颜色
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inactiveColor: {
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type: String, default: '#606266'
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},
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// 点击遮罩是否关闭菜单
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closeOnClickMask: {
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type: Boolean, default: true
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},
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// 点击当前激活项标题是否关闭菜单
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closeOnClickSelf: {
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type: Boolean, default: true
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},
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// 过渡时间
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duration: {
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type: [Number, String], default: 300
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},
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// 标题菜单的高度,单位任意,数值默认为rpx单位
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height: {
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type: [Number, String], default: 90
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},
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// 是否显示下边框
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borderBottom: {
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type: Boolean, default: false
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},
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// 标题的字体大小
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titleSize: {
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type: [Number, String], default: 28
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},
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// 菜单右侧的icon图标
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menuIcon: {
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type: String, default: 'arrow-down'
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},
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// 菜单右侧图标的大小
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menuIconSize: {
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type: [Number, String], default: 11
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},
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// 背景色
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backgroundColor: {
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type: String, default: 'transparent'
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},
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// 显示的菜单
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menuList: {
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type: Array, default() { return [] }
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},
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// h5的导航栏高度
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H5NavBarHeight: {
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type: Number, default: 44
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},
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},
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data() {
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return {
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titleHeight: 40,
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active: false, // 下拉菜单的状态
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// 当前是第几个菜单处于激活状态,小程序中此处不能写成false或者"",否则后续将current赋值为0,
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// 无能的TX没有使用===而是使用==判断,导致程序认为前后二者没有变化,从而不会触发视图更新
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current: 99999,
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currentKey: '',
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// 让某个菜单保持高亮的状态
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highlightIndex: 99999,
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contentHeight: 0, // 内容高度
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maskClass: { // 遮罩层样式
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'position': 'fixed', 'bottom': 0, 'top': 0, 'left': 0, 'right': 0, 'backgroundColor': 'rgba(0, 0, 0, 0.6)', 'z-index': 999999
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},
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transClass: { // 内容弹框样式
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'position': 'fixed', 'left': 0, 'right': 0, 'top': 0, 'z-index': 999999
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},
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// #ifndef MP
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childList: [],
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// #endif
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timers: null
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}
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},
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created() {
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// #ifdef MP
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// 供子组件调用,不能在data中声明变量,否则在微信小程序会造成循环引用而报错
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this.childList = [];
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// #endif
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},
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mounted() {
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this.$nextTick(() => {
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this.titleHeight = uni.upx2px(this.height);
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})
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},
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methods: {
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// 点击菜单
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handlerMenuClick(index, dropdownKey) {
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// 判断是否被禁用
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if (this.menuList[index].disabled) return;
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// 如果点击时的索引和当前激活项索引相同,意味着点击了激活项,需要收起下拉菜单
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if (index == this.current && this.closeOnClickSelf) {
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return this.close();
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}
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clearTimeout(this.timers);
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this.timers = setTimeout(() => {
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this.open(index, dropdownKey);
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clearTimeout(this.timers);
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}, 0);
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},
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// 打开下拉菜单
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open(index, dropdownKey) {
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// 重置高亮索引,否则会造成多个菜单同时高亮
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this.highlightIndex = 9999;
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// 展开时,设置下拉内容的样式
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// 标记展开状态以及当前展开项的索引
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this.active = true;
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this.current = index;
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this.currentKey = dropdownKey;
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this.getContentHeight();
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this.childList.forEach(item => item.init())
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this.$emit('open', this.current);
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},
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// 设置下拉菜单处于收起状态
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close() {
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this.$emit('close', this.current);
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// 设置为收起状态,同时current归位,设置为空字符串
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this.active = false;
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this.current = 99999;
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this.currentKey = '';
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// #ifndef MP
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this.childList = [];
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// #endif
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},
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// 点击遮罩
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handlerMaskClick() {
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// 如果不允许点击遮罩,直接返回
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if (!this.closeOnClickMask) return;
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this.close();
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},
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// 外部手动设置某个菜单高亮
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highlight(index = undefined) {
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this.highlightIndex = index !== undefined ? index : 99999;
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},
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// 获取下拉菜单内容的高度
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getContentHeight() {
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// #ifdef APP-NVUE
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uni.createSelectorQuery().in(this).select('#fy_dropdown__menu').boundingClientRect().exec(rect => {
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const data = rect[0];
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const top = data.top + this.titleHeight + 'px';
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this.maskClass.top = top;
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this.transClass.top = top;
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});
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// #endif
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// #ifndef APP-NVUE
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uni.createSelectorQuery().in(this).select('.fy_dropdown__menu').boundingClientRect(rect => {
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const top = rect.top + this.titleHeight + 'px';
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this.maskClass.top = top;
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this.transClass.top = top;
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}).exec()
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// #endif
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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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@import './fy-dropdown.scss';
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</style>
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