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<template>
<view class="u-dropdown-item" v-if="active" @touchmove.stop.prevent="() => {}" @tap.stop.prevent="() => {}">
<block v-if="!$slots.default && !$slots.$default">
<scroll-view class="u-dropdown-item__scroll" scroll-y="true" :style="{
height: addUnit(height)
}">
<view class="u-dropdown-item__options">
<up-cell-group>
<up-cell @click="cellClick(item.value)" :arrow="false" :title="item.label" v-for="(item, index) in options"
:key="index" :title-style="{
color: modelValue == item.value ? activeColor : inactiveColor
}">
<up-icon v-if="modelValue == item.value" name="checkbox-mark" :color="activeColor" size="32"></up-icon>
</up-cell>
</up-cell-group>
</view>
</scroll-view>
</block>
<slot v-else />
</view>
</template>
<script>
import { props } from './props';
import { mpMixin } from '../../libs/mixin/mpMixin';
import { mixin } from '../../libs/mixin/mixin';
import { addUnit, $parent } from '../../libs/function/index';
/**
* dropdown-item 下拉菜单
* @description 该组件一般用于向下展开菜单,同时可切换多个选项卡的场景
* @tutorial https://ijry.github.io/uview-plus/components/dropdown.html
* @property {String | Number} v-model 双向绑定选项卡选择值
* @property {String} title 菜单项标题
* @property {Array[Object]} options 选项数据,如果传入了默认slot,此参数无效
* @property {Boolean} disabled 是否禁用此选项卡(默认false)
* @property {String | Number} duration 选项卡展开和收起的过渡时间,单位ms(默认300)
* @property {String | Number} height 弹窗下拉内容的高度(内容超出将会滚动)(默认auto)
* @example <u-dropdown-item title="标题"></u-dropdown-item>
*/
export default {
name: 'u-dropdown-item',
mixins: [mpMixin, mixin, props],
options: {
styleIsolation: 'shared',
},
data() {
return {
active: false, // 当前项是否处于展开状态
activeColor: '#2979ff', // 激活时左边文字和右边对勾图标的颜色
inactiveColor: '#606266', // 未激活时左边文字和右边对勾图标的颜色
}
},
computed: {
// 监听props是否发生了变化,有些值需要传递给父组件u-dropdown,无法双向绑定
propsChange() {
return `${this.title}-${this.disabled}`;
}
},
watch: {
propsChange(n) {
// 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
// 将所有子组件数据重新整理一遍
if (this.parent) this.parent.init();
}
},
created() {
// 父组件的实例
this.parent = false;
},
emits: ['update:modelValue', 'change'],
methods: {
addUnit,
init() {
// 获取父组件u-dropdown
let parent = $parent.call(this, 'u-dropdown');
if (parent) {
this.parent = parent;
// 将子组件的激活颜色配置为父组件设置的激活和未激活时的颜色
this.activeColor = parent.activeColor;
this.inactiveColor = parent.inactiveColor;
// 将本组件的this,放入到父组件的children数组中,让父组件可以操作本(子)组件的方法和属性
// push进去前,显判断是否已经存在了本实例,因为在子组件内部数据变化时,会通过父组件重新初始化子组件
let exist = parent.children.find(val => {
return this === val;
})
if (!exist) parent.children.push(this);
if (parent.children.length == 1) this.active = true;
// 父组件无法监听children的变化,故将子组件的title,传入父组件的menuList数组中
parent.menuList.push({
title: this.title,
disabled: this.disabled
});
}
},
// cell被点击
cellClick(value) {
// 修改通过v-model绑定的值
// #ifdef VUE2
this.$emit('input', value);
// #endif
// #ifdef VUE3
this.$emit('update:modelValue', value);
// #endif
// 通知父组件(u-dropdown)收起菜单
this.parent.close();
// 发出事件,抛出当前勾选项的value
this.$emit('change', value);
}
},
mounted() {
this.init();
}
}
</script>
<style scoped lang="scss">
@import "../../libs/css/components.scss";
.u-dropdown-item__scroll {
background: #ffffff;
}
</style>