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231 lines
6.2 KiB
231 lines
6.2 KiB
<template>
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<view class="u-dropdown">
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<view class="u-dropdown__menu" :style="{
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height: $u.addUnit(height)
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}" :class="{
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'u-border-bottom': borderBottom
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}">
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<view class="u-dropdown__menu__item" v-for="(item, index) in menuList" :key="index" @tap.stop="menuClick(index)">
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<view class="u-flex">
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<text class="u-dropdown__menu__item__text" :style="{
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color: item.disabled ? '#c0c4cc' : (index === current || highlightIndex == index) ? activeColor : inactiveColor,
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fontSize: $u.addUnit(titleSize)
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}">{{item.title}}</text>
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<view class="u-dropdown__menu__item__arrow" :class="{
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'u-dropdown__menu__item__arrow--rotate': index === current
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}">
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<u-icon :custom-style="{display: 'flex'}" name="arrow-down" size="26" :color="index === current || highlightIndex == index ? activeColor : '#c0c4cc'"></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="u-dropdown__content" :style="[contentStyle, {
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transition: `opacity ${duration / 1000}s linear`
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}]" @tap="maskClick" @touchmove.stop.prevent>
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<view @tap.stop.prevent class="u-dropdown__content__popup" :style="[popupStyle]">
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<slot></slot>
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</view>
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</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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name: 'u-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,
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default: '#2979ff'
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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,
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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,
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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,
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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],
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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],
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default: 80
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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,
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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],
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default: 28
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}
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},
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data() {
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return {
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showDropdown: true, // 是否打开下来菜单,
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menuList: [], // 显示的菜单
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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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// 外层内容的样式，初始时处于底层，且透明
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contentStyle: {
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zIndex: -1,
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opacity: 0
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},
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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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}
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},
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computed: {
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// 下拉出来部分的样式
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popupStyle() {
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let style = {};
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// 进行Y轴位移，展开状态时，恢复原位。收齐状态时，往上位移100%，进行隐藏
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style.transform = `translateY(${this.active ? 0 : '-100%'})`
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return style;
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}
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},
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created() {
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// 引用所有子组件(u-dropdown-item)的this，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.children = [];
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},
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methods: {
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init() {
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// 当某个子组件内容变化时，触发父组件的init，父组件再让每一个子组件重新初始化一遍
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// 以保证数据的正确性
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this.menuList = [];
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this.children.map(child => {
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child.init();
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})
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},
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// 点击菜单
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menuClick(index) {
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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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this.close();
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// 等动画结束后，再移除下拉菜单中的内容，否则直接移除，也就没有下拉菜单收起的效果了
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setTimeout(() => {
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this.children[index].active = false;
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}, this.duration)
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return;
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}
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this.open(index);
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},
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// 打开下拉菜单
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open(index) {
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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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this.contentStyle = {
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zIndex: 11,
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opacity: 1
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}
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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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// 历遍所有的子元素，将索引匹配的项标记为激活状态，因为子元素是通过v-if控制切换的
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// 之所以不是因display: none，是因为nvue没有display这个属性
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this.children.map((val, idx) => {
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val.active = index == idx ? true : false;
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})
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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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// 下拉内容的样式进行调整，不透明度设置为0
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this.contentStyle = {
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zIndex: -1,
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opacity: 0
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}
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},
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// 点击遮罩
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maskClick() {
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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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}
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}
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</script>
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<style scoped lang="scss">
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@import "../../libs/css/style.components.scss";
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.u-dropdown {
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flex: 1;
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width: 100%;
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&__menu {
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@include vue-flex;
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position: relative;
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z-index: 11;
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height: 80rpx;
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&__item {
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flex: 1;
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@include vue-flex;
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justify-content: center;
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align-items: center;
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&__text {
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font-size: 28rpx;
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color: $u-content-color;
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}
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&__arrow {
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margin-left: 6rpx;
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transition: transform .3s;
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align-items: center;
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@include vue-flex;
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&--rotate {
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transform: rotate(180deg);
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}
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}
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}
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}
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&__content {
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position: absolute;
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z-index: 11;
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height: 100%;
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width: 100%;
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left: 0px;
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overflow: hidden;
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background: rgba(0, 0, 0, .3);
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opacity: 0;
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&__popup {
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z-index: 11;
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transition: all 0.3s;
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transform: translate3D(0, -100%, 0);
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}
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}
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}
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</style>
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