255 lines
8.5 KiB
Vue
255 lines
8.5 KiB
Vue
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<template>
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<view class="u-dropdown">
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<view class="u-dropdown__menu" :style="{
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height: 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 u-flex-row">
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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: 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="menuIcon" :size="addUnit(menuIconSize)" :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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top: addUnit(height),
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height: contentHeight + 'px'
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}]"
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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 class="u-dropdown__content__mask"></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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import props from './props';
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import mpMixin from '../../libs/mixin/mpMixin';
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import mixin from '../../libs/mixin/mixin';
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import { addUnit, sys} from '../../libs/function/index';
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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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* @tutorial https://ijry.github.io/uview-plus/components/dropdown.html
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* @property {String} active-color 标题和选项卡选中的颜色（默认#2979ff）
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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80）
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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 <u-dropdown></u-dropdown>
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*/
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export default {
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name: 'u-dropdown',
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mixins: [mpMixin, mixin, props],
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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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contentHeight: 0
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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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style['transition-duration'] = this.duration / 1000 + 's';
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style.borderRadius = `0 0 ${addUnit(this.borderRadius)} ${addUnit(this.borderRadius)}`;
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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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mounted() {
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this.getContentHeight();
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},
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emits: ['open', 'close'],
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methods: {
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addUnit,
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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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// 嵌套popup使用时可能获取不到正确的高度，重新计算
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if (this.contentHeight < 1) this.getContentHeight()
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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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}
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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.$emit('close', this.current);
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// 设置为收起状态，同时current归位，设置为空字符串
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this.active = false;
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this.current = 99999;
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// 下拉内容的样式进行调整，不透明度设置为0
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this.contentStyle = {
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zIndex: -1,
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opacity: 0
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}
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},
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// 点击遮罩
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maskClick() {
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// 如果不允许点击遮罩，直接返回
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if (!this.closeOnClickMask) return;
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this.close();
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},
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// 外部手动设置某个菜单高亮
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highlight(index = undefined) {
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this.highlightIndex = index !== undefined ? index : 99999;
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},
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// 获取下拉菜单内容的高度
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getContentHeight() {
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// 这里的原理为，因为dropdown组件是相对定位的，它的下拉出来的内容，必须给定一个高度
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// 才能让遮罩占满菜单一下，直到屏幕底部的高度
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// sys()为uview-plus封装的获取设备信息的方法
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let windowHeight = sys().windowHeight;
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this.$uGetRect('.u-dropdown__menu').then(res => {
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// 这里获取的是dropdown的尺寸，在H5上，uniapp获取尺寸是有bug的(以前提出修复过，后来又出现了此bug，目前hx2.8.11版本)
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// H5端bug表现为元素尺寸的top值为导航栏底部到到元素的上边沿的距离，但是元素的bottom值确是导航栏顶部到元素底部的距离
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// 二者是互相矛盾的，本质原因是H5端导航栏非原生，uni的开发者大意造成
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// 这里取菜单栏的botton值合理的，不能用res.top，否则页面会造成滚动
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this.contentHeight = windowHeight - res.bottom;
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})
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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/components.scss";
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.u-dropdown {
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flex: 1;
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width: 100%;
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position: relative;
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&__menu {
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@include 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 flex;
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justify-content: center;
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align-items: center;
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.u-flex-row {
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flex-direction: row;
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}
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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 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: 8;
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width: 100%;
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left: 0px;
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bottom: 0;
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overflow: hidden;
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&__mask {
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position: absolute;
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z-index: 9;
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background: rgba(0, 0, 0, .3);
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width: 100%;
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left: 0;
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top: 0;
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bottom: 0;
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}
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&__popup {
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position: relative;
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z-index: 10;
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transition: all 0.3s;
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transform: translate3D(0, -100%, 0);
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overflow: hidden;
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}
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}
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}
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</style>
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