133 lines
		
	
	
		
			4.2 KiB
		
	
	
	
		
			Vue
		
	
	
	
			
		
		
	
	
			133 lines
		
	
	
		
			4.2 KiB
		
	
	
	
		
			Vue
		
	
	
	
| <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 scroll-y="true" :style="{
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| 				height: $u.addUnit(height)
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| 			}">
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| 				<view class="u-dropdown-item__options">
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| 					<u-cell-group>
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| 						<u-cell-item @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: value == item.value ? activeColor : inactiveColor
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| 						}">
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| 							<u-icon v-if="value == item.value" name="checkbox-mark" :color="activeColor" size="32"></u-icon>
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| 						</u-cell-item>
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| 					</u-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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| 
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| <script>
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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 http://uviewui.com/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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| 		props: {
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| 			// 当前选中项的value值
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| 			value: {
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| 				type: [Number, String, Array],
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| 				default: ''
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| 			},
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| 			// 菜单项标题
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| 			title: {
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| 				type: [String, Number],
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| 				default: ''
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| 			},
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| 			// 选项数据,如果传入了默认slot,此参数无效
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| 			options: {
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| 				type: Array,
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| 				default () {
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| 					return []
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| 				}
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| 			},
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| 			// 是否禁用此菜单项
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| 			disabled: {
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| 				type: Boolean,
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| 				default: false
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| 			},
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| 			// 下拉弹窗的高度
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| 			height: {
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| 				type: [Number, String],
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| 				default: 'auto'
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| 			},
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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}-${this.disabled}`;
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| 			}
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| 		},
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| 		watch: {
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| 			propsChange(n) {
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| 				// 当值变化时,通知父组件重新初始化,让父组件执行每个子组件的init()方法
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| 				// 将所有子组件数据重新整理一遍
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| 				if (this.parent) this.parent.init();
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| 			}
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| 		},
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| 		created() {
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| 			// 父组件的实例
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| 			this.parent = false;
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| 		},
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| 		methods: {
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| 			init() {
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| 				// 获取父组件u-dropdown
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| 				let parent = this.$u.$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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| 				this.$emit('input', value);
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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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| 
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| <style scoped lang="scss">
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| 	@import "../../libs/css/style.components.scss";
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| </style>
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