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<template>
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<view class="u-drawdown">
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<view
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class="u-dropdown__menu"
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:style="{
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height: $u.addUnit(height)
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}"
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ref="u-dropdown__menu"
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>
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<view
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class="u-dropdown__menu__item"
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v-for="(item, index) in menuList"
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:key="index"
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@tap.stop="clickHandler(item, index)"
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>
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<view class="u-dropdown__menu__item__content">
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<text
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class="u-dropdown__menu__item__content__text"
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:style="[index === current ? activeStyle : inactiveStyle]"
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>{{item.title}}</text>
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<view
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class="u-dropdown__menu__item__content__arrow"
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:class="[index === current && 'u-dropdown__menu__item__content__arrow--rotate']"
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>
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<u-icon
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:name="menuIcon"
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:size="$u.addUnit(menuIconSize)"
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></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">
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<slot />
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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.js';
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/**
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* Dropdown
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* @description
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* @tutorial url
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* @property {String}
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* @event {Function}
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* @example
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*/
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export default {
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name: 'u-dropdown',
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mixins: [uni.$u.mixin, props],
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data() {
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return {
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// 菜单数组
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menuList: [],
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current: 0
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}
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},
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computed: {
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},
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created() {
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// 引用所有子组件(u-dropdown-item)的this，不能在data中声明变量，否则在微信小程序会造成循环引用而报错
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this.children = [];
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},
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methods: {
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clickHandler(item, index) {
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this.children.map(child => {
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if(child.title === item.title) {
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// this.queryRect('u-dropdown__menu').then(size => {
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child.$emit('click')
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child.setContentAnimate(child.show ? 0 : 300)
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child.show = !child.show
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// })
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} else {
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child.show = false
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child.setContentAnimate(0)
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}
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})
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},
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// 获取标签的尺寸位置
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queryRect(el) {
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// #ifndef APP-NVUE
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// $uGetRect为uView自带的节点查询简化方法，详见文档介绍：https://www.uviewui.com/js/getRect.html
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// 组件内部一般用this.$uGetRect，对外的为this.$u.getRect，二者功能一致，名称不同
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return new Promise(resolve => {
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this.$uGetRect(`.${el}`).then(size => {
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resolve(size)
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})
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})
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// #endif
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// #ifdef APP-NVUE
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// nvue下，使用dom模块查询元素高度
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// 返回一个promise，让调用此方法的主体能使用then回调
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return new Promise(resolve => {
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dom.getComponentRect(this.$refs[el], res => {
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resolve(res.size)
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})
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})
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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 '../../libs/css/components.scss';
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.u-dropdown {
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&__menu {
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@include flex;
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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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&__content {
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@include flex;
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align-items: center;
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}
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}
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}
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}
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</style>
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