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<template>
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<view class="u-dropdown-item" v-if="active" @touchmove.stop.prevent="() => {}" @tap.stop.prevent="() => {}">
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<block v-if="!$slots.default && !$slots.$default">
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<scroll-view class="u-dropdown-item__scroll" scroll-y="true" :style="{
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height: addUnit(height)
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}">
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<view class="u-dropdown-item__options">
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<up-cell-group>
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<up-cell @click="cellClick(item.value)" :arrow="false" :title="item.label" v-for="(item, index) in options"
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:key="index" :title-style="{
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color: modelValue == item.value ? activeColor : inactiveColor
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}">
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<up-icon v-if="modelValue == item.value" name="checkbox-mark" :color="activeColor" size="32"></up-icon>
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</up-cell>
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</up-cell-group>
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</view>
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</scroll-view>
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</block>
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<slot v-else />
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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, $parent } from '../../libs/function/index';
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/**
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* dropdown-item 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 | Number} v-model 双向绑定选项卡选择值
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* @property {String} title 菜单项标题
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* @property {Array[Object]} options 选项数据，如果传入了默认slot，此参数无效
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* @property {Boolean} disabled 是否禁用此选项卡（默认false）
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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 弹窗下拉内容的高度(内容超出将会滚动)（默认auto）
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* @example <u-dropdown-item title="标题"></u-dropdown-item>
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*/
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export default {
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name: 'u-dropdown-item',
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mixins: [mpMixin, mixin, props],
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options: {
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styleIsolation: 'shared',
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},
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data() {
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return {
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active: false, // 当前项是否处于展开状态
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activeColor: '#2979ff', // 激活时左边文字和右边对勾图标的颜色
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inactiveColor: '#606266', // 未激活时左边文字和右边对勾图标的颜色
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}
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},
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computed: {
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// 监听props是否发生了变化，有些值需要传递给父组件u-dropdown，无法双向绑定
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propsChange() {
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return `${this.title}-${this.disabled}`;
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}
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},
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watch: {
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propsChange(n) {
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// 当值变化时，通知父组件重新初始化，让父组件执行每个子组件的init()方法
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// 将所有子组件数据重新整理一遍
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if (this.parent) this.parent.init();
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}
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},
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created() {
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// 父组件的实例
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this.parent = false;
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},
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emits: ['update:modelValue', 'change'],
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methods: {
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addUnit,
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init() {
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// 获取父组件u-dropdown
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let parent = $parent.call(this, 'u-dropdown');
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if (parent) {
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this.parent = parent;
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// 将子组件的激活颜色配置为父组件设置的激活和未激活时的颜色
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this.activeColor = parent.activeColor;
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this.inactiveColor = parent.inactiveColor;
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// 将本组件的this，放入到父组件的children数组中，让父组件可以操作本(子)组件的方法和属性
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// push进去前，显判断是否已经存在了本实例，因为在子组件内部数据变化时，会通过父组件重新初始化子组件
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let exist = parent.children.find(val => {
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return this === val;
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})
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if (!exist) parent.children.push(this);
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if (parent.children.length == 1) this.active = true;
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// 父组件无法监听children的变化，故将子组件的title，传入父组件的menuList数组中
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parent.menuList.push({
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title: this.title,
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disabled: this.disabled
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});
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}
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},
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// cell被点击
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cellClick(value) {
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// 修改通过v-model绑定的值
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// #ifdef VUE2
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this.$emit('input', value);
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// #endif
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// #ifdef VUE3
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this.$emit('update:modelValue', value);
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// #endif
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// 通知父组件(u-dropdown)收起菜单
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this.parent.close();
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// 发出事件，抛出当前勾选项的value
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this.$emit('change', value);
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}
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},
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mounted() {
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this.init();
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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-item__scroll {
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background: #ffffff;
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}
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</style>
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