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yanzong_qianduan/uni_modules/vk-uview-ui/components/u-dropdown-item/u-dropdown-item.vue

167 lines
4.5 KiB

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